JP2020036098A - Power conversion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power conversion device having a sufficiently large impedance. SOLUTION: The power conversion device 300 is three or more first conductors, and each first conductor has a main body 111 having a length corresponding to a half wavelength in a free space wavelength at a frequency of a received radio wave. , A first connecting portion 112 connected to one end of the main body portion and a second connecting portion 113 connected to the other end of the main body portion, and three or more conductors arranged so as to be spatially adjacent to each other. It is located in a space surrounded by one conductor 110 and the main body of three or more first conductors, extends from the first feeding point 121A, and is connected to the first connection of three or more first conductors. It has a first element 120A and a second element 120B extending from a first feeding point and a second feeding point constituting a balanced terminal and connected to a second connecting portion of three or more first conductors. Each first conductor includes a second conductor constituting the folded dipole antenna 100, and a rectifying circuit 200 connected to the first feeding point and the second feeding point. [Selection diagram] Fig. 1

Description

  The present invention relates to a power converter.

  Conventionally, a balanced two-wire antenna, a balanced two-wire line, a rectifier circuit, and a DC output part are formed on one main surface of a substrate, and the rectifier circuit includes a DC blocking capacitor, a Schottky barrier diode, and a smoothing capacitor. There is a rectenna device in which the distance between the Schottky barrier diode and the smoothing capacitor is λg / 22.5 to λg / 14, where λg is the wavelength of the microwave to be received (for example, see Patent Document 1). ).

JP 2007-116515 A

  By the way, the conventional rectenna device has difficulty in obtaining a sufficient power generation voltage when the surrounding radio wave intensity is weak. One of the reasons is that the impedance of the conventional rectenna device was not sufficiently large.

  Therefore, an object is to provide a power conversion device having a sufficiently large impedance.

  The power converter according to the embodiment of the present invention includes three or more first conductors, each of the first conductors having a length corresponding to a half wavelength in a free space wavelength at a frequency of a radio wave to be received. And a first connection portion connected to one end of the main body portion, and a second connection portion connected to the other end of the main body portion, three or more of which are arranged to be spatially adjacent to each other. A first conductor, located in a space surrounded by the main body of the three or more first conductors, extending from a first feeding point, and connected to a first connection part of the three or more first conductors; A first element and a second element extending from a second feeding point forming a balanced terminal with the first feeding point and connected to a second connection portion of the three or more first conductors. A second conductor forming a folded dipole antenna with each first conductor, and being connected to the first feeding point and the second feeding point. And a flow circuit.

  A power conversion device having a sufficiently large impedance can be provided.

FIG. 2 is a diagram showing a power conversion device 300 including the folded dipole antenna 100 according to the embodiment. FIG. 3 is a diagram showing a configuration of a folded dipole antenna 100 including four elements 110. It is a figure showing a simulation result. FIG. 9 is a diagram showing a simulation result of the folded dipole antenna 100. Is a diagram showing characteristics of a step-up ratio ^{n 2} with respect to the ratio r1 / r2 of the radius r2 of the radius r1 and the element 120 of the main body portion 111 of the folded dipole antenna 100. Is a diagram showing characteristics of a step-up ratio ^{n 2} with respect to the radius r of the main body portion 111 and the element 120 in the folded dipole antenna 100. Is a diagram showing characteristics of a step-up ratio n ² with respect to distance h in the folded dipole antenna 100. FIG. 9 is a diagram showing a simulation result of the folded dipole antenna 100. FIG. 3 is a diagram showing dimensions of each part of the dipole antenna 100. FIG. 3 is a diagram showing a power conversion device 300M1 including the folded dipole antenna 100M1 of the embodiment. FIG. 3 is a diagram showing a power conversion device 300M2 including the folded dipole antenna 100M2 of the embodiment. It is a figure showing the composition of folded dipole antenna 100M3. It is a figure showing composition of folded dipole antenna 100M4.

  Hereinafter, embodiments to which the power conversion device of the present invention is applied will be described.

<First Embodiment>
FIG. 1 is a diagram illustrating a power conversion device 300 including the folded dipole antenna 100 according to the embodiment.

  Power conversion device 300 includes folded dipole antenna 100 and rectifier circuit 200. The power converter 300 converts the high frequency power of the radio wave received by the folded dipole antenna 100 into DC power by the rectifier circuit 200 and outputs the DC power.

  The folded dipole antenna 100 has an inductive impedance characteristic. Therefore, the power conversion device 300 can achieve impedance matching between the rectifier circuit 200 having capacitive impedance and the folded dipole antenna 100 without including a filter other than the folded dipole antenna 100 and the rectifier circuit 200. it can. Hereinafter, this will be described in detail.

  The folded dipole antenna 100 has N elements 110 and one element 120. N is an integer of 3 or more. That is, the folded dipole antenna 100 includes three or more elements 110.

  In FIG. 1, the folded dipole antenna 100 is manufactured by combining copper metal rods as an example. However, the folded dipole antenna 100 may be made of a metal other than copper, or may be manufactured by patterning a metal foil on the surface of a substrate or the like.

  The element 110 has a main body 111 and connecting portions 112 and 113. The element 110 is an example of a first conductor. The N elements 110 are arranged such that the central axis of the main body 111 is positioned on the outer peripheral surface of a virtual cylinder having the central axis C of the element 120 as the central axis, and the circumferences of the adjacent main bodies 111 are adjacent to each other. Are arranged so that the angles θ in the directions are equal. That is, the N elements 110 are arranged such that the main body 111 is arranged at equal intervals on the outer peripheral surface of a virtual cylinder having the central axis C of the element 120 as the central axis.

  Since the N elements 110 have the same configuration, only one element 110 will be described here.

  The main body 111 has ends 111A and 111B. The connection part 112 connects the end part 111A and the end part 122A of the element 120, and the connection part 113 connects the end part 111B and the end part 122B of the element 120.

  The main body 111 extends with the ends 111A and 111B at both ends in parallel with the central axis C of the elongated cylindrical element 120. The main body 111 is arranged in parallel with the element 120.

The length L of the body portion 111 is set to a length corresponding to approximately half the wavelength of the free-space wavelength lambda ₀ of the radio wave folded dipole antenna 100 receives (about λ _0/2). This is because the element 110 corresponds to the entire length of the folded dipole antenna 100 (the length from the end of the element 120 in the central axis direction).

Here, the length corresponding to the half wavelength of the free-space wavelength lambda ₀ of the radio wave (λ _0/2), is not limited to strictly radio free space wavelength lambda ₀ of the half wavelength (λ _0/2), folded in adjusting to function as a dipole antenna 100, is meant to include the length of the case is slightly shorter than a half wavelength (λ _0/2).

  The element width (diameter of the column) of the main body 111 of the element 110 is larger than the element width (diameter of the column) of the element 120, and the radius of the main body 111 is larger than the radius of the element 120. Have been. In the folded dipole antenna 100, the impedance is determined by the element width of the element 110 with respect to the element width of the element 120. By making the element width of the element 110 larger than the element width of the element 120, the impedance of the folded dipole antenna 100 can be increased.

  In the case where the elements 110 and 120 are made of metal foil on the surface of the substrate, if the element width of the element 110 with respect to the thickness of the main body 111 is larger than the element width with respect to the thickness of the element 120, Good.

  Element 120 has elements 120A and 120B. The element 120 is an example of a second conductor.

  The element 120A has a feeding point 121A and an end 122A. Element 120A is an example of a first element. The feeding point 121A is an example of a first feeding point. The end 122A is an example of a first end. The element 120A is parallel to the main body 111 of the element 110. The feeding point 121A is connected to the terminal 201 of the rectifier circuit 200.

  The element 120B has a feeding point 121B and an end 122B. Element 120B is an example of a second element. The feeding point 121B is an example of a second feeding point, and is located at a point symmetrical with the feeding point 121A with an axis perpendicular to the central axis C of the element 120 as a symmetric axis. The end 122B is an example of a second end.

  Feed points 121A and 121B are examples of a balanced terminal. Terminals 201 and 202 of the rectifier circuit 200 are connected to the feeding points 121A and 121B. The connection between the feeding points 121A and 121B and the terminals 201 and 202 of the rectifier circuit 200 may be made by a copper foil pattern or the like at the shortest distance, for example. In FIG. 1, connection portions between the feeding points 121A and 121B and the terminals 201 and 202 of the rectifier circuit 200 are indicated by two broken lines.

  The element 120B is parallel to the main body 111 of the element 110. The feeding point 121B is connected to the terminal 202 of the rectifier circuit 200.

  The element 120B is arranged so as to be line-symmetric with the element 120A with respect to the symmetry axis of the feeding points 121A and 121B in plan view. The length of element 120B is equal to the length of element 120A. The length from the ends 122A to 122B is 1/2 (λe / 2) of the electrical length λe at 1000 MHz. This length includes the distance between the feeding points 121A and 121B, in other words, the distance between the end 122A and the end 122B.

  Since the rectifier circuit 200 has a high impedance, it is necessary to increase the impedance of the folded dipole antenna 100 in order to match the capacitive impedance of the rectifier circuit 200 with the inductive impedance of the folded dipole antenna 100.

  For this reason, the element width of the element 110 is made larger than the element width of the element 120. By performing conjugate matching between the impedance of the folded dipole antenna 100 and the impedance of the rectifier circuit 200, the rectification efficiency of the rectifier circuit 200 can be increased.

  The rectifier circuit 200 includes terminals 201 and 202, capacitors 211, 212, 213, and 214, diodes 221, 222, 223, and 224, and output terminals 231 and 232. The rectifier circuit 200 is, for example, a Cockcroft-Walton type rectifier circuit.

  Terminal 201 has capacitors 211 and 212 connected in series, and terminal 202 has capacitors 213 and 214 connected in series. The diodes 221, 222, 223, and 224 are connected in a crossing manner between the capacitors 211, 212, 213, and 214, as shown in FIG.

  The rectifier circuit 200 converts the high-frequency power input from the folded dipole antenna 100 into a DC voltage and outputs the DC voltage from the output terminals 231 and 232. The impedance of such a rectifier circuit 200 is capacitive under the influence of the capacitance between the terminals of the diodes 221, 222, 223, and 224.

  Further, since the folded dipole antenna 100 of the present embodiment has inductive impedance characteristics, the power converter 300 is not provided with a filter, but may be provided with a filter. In that case, the impedance of the folded dipole antenna 100 does not necessarily need to be inductive, but may be resistive or capacitive.

  FIG. 2 is a diagram illustrating a configuration of the folded dipole antenna 100 including the four elements 110. FIG. 2 shows the main body 111 and the connection part 112 of the element 110 and the element 120.

  Here, the length (outside dimension) between the ends 111A and 111B of the main body 111 is 150 mm, the interval between the feeding points 121A and 121B is 5 mm, the length from the feeding point 121A to the end 122A is 72.5 mm, The simulation was performed with the length from the feeding point 121B to the end 122B being 72.5 mm.

FIG. 3 is a diagram showing a simulation result. In FIG. 3A, the radius r1 of the main body 111 and the radius r2 of the element 120 are fixed to 0.125 mm, and the distance (shortest distance) h between the surface of the main body 111 and the surface of the element 120 is 2 mm to 12 mm. 7 shows the impedance R ₀ (Ω) of the folded dipole antenna 100M viewed from the feeding points 121A and 121B when the impedance is changed up to.

As shown in FIG. 3A, it was found that the impedance R ₀ (Ω) increased as the interval h became smaller. It has been found that in order to obtain 10 kΩ or more under the simulation conditions, the interval h may be set to about 2.5 mm or less. In addition, since it was possible to obtain an antenna having an impedance of about 5 kΩ even in the conventional configuration, it was assumed in the embodiment that an antenna having an impedance of 10 kΩ or more was obtained.

FIG. 3B shows the condition that the distance (shortest distance) h between the surface of the main body 111 and the surface of the element 120 is fixed to 6 mm, and the radius r2 of the element 120 is fixed to 0.125 mm. The impedance R ₀ (Ω) when the ratio r1 / r2 of the radius r1 of 111 and the radius r2 of the element 120 is changed is shown.

It has been found that the impedance _R0 becomes 10 kΩ or more when the ratio r1 / r2 of the radius r1 of the main body 111 to the radius r2 of the element 120 is 1.3 or more.

  Here, the simulation result in the case where the number of the elements 110 is four has been described. However, even when the elements 110 are different, the same tendency can be confirmed.

FIG. 4 is a diagram illustrating a simulation result of the folded dipole antenna 100. Under the condition that the folded dipole antenna 100 receives a radio wave of 1000 MHz, the length L of the main body 111 of the element 110 in the Y-axis direction, the radius r1 of the main body 111, the radius r2 of the element 120, and the distance between the main body 111 and the element 120 When the interval h is set to two values as shown in FIG. 4, the impedance R ₀ (Ω) and the bandwidth BW of the folded dipole antenna 100 viewed from the feeding points 121A and 121B are the results as shown in FIG. Became. Note that the bandwidth BW indicates a band where the VSWR becomes 2 or less as a percentage with respect to 1000 MHz.

  The difference between the sample of Example 1 and the sample of Example 2 is the radius r2 of the element 120, which is 0.5 mm in Example 1 and 0.125 mm in Example 2.

The impedance R _{0 of} Example 1 is 12.0 K (Ω) and the bandwidth BW is 2.5%, and the impedance R _{0 of} Example 2 is 24.1 K (Ω) and the bandwidth BW is 1 0.8%. Thus, it was found that the larger the radius r2 of the element 120, the lower the impedance _R0 . Further, it was found that the larger the radius r2 of the element 120 was, the smaller the band width BW was.

Figure 5 is a graph showing the characteristics of the step-up ratio ^{n 2} with respect to the ratio r1 / r2 of the diameter r2 of the diameter r1 and the element 120 of the main body portion 111 of the folded dipole antenna 100. Here, the length L of the main body 111 was 150 mm, and the interval h was 2 mm. The radio wave received by the folded dipole antenna 100 was 1000 MHz.

Here, the step-up ratio n ^2, represents the ratio of the impedance R ₀ of the folded dipole antenna 100 to the impedance of a typical dipole antenna (increment). Here, the step-up ratio ^{n 2} is at 137, the impedance _{R 0} is to be a 10 k.OMEGA.

Was shaken ratio r1 / r2 of the diameter r2 of the diameter r1 and the element 120, as shown in FIG. 5, when the ratio r1 / r2 is 1 or more, the step-up ratio ^{n 2} is found to be at 137 or more Was. In addition, it was found that the ratio r1 / r2 increased up to 4, but decreased when the ratio exceeded 1 / r2.

  Here, the simulation result in the case where the received radio wave is 1000 MHz has been described, but it has been confirmed that the same tendency is exhibited even when the radio wave frequency is different.

Figure 6 is a graph showing the characteristics of the step-up ratio ^{n 2} with respect to the radius r of the main body portion 111 and the element 120 in the folded dipole antenna 100. Here, the radius r1 of the main body 111 is equal to the radius r2 of the element 120, and both are shown as the radius r. Here, the length L of the main body 111 was 150 mm, and the interval h was 6 mm. The radio wave received by the folded dipole antenna 100 was 1000 MHz.

When waved radius r, as shown in FIG. 6, the characteristics of the step-up ratio n ² increases with increasing radius r is obtained. That is, it has been found that the impedance R ₀ of the folded dipole antenna 100 increases as the radius r increases.

The impedance _{R 0} is equal to or greater than 10 k.OMEGA, since the step-up ratio ^{n 2} can fall within 137 or more, the radius r is found that may be at least 0.33 mm. 0.33 mm is 1/90 of the electrical length λe at 1000 MHz.

  Here, the simulation result in the case where the received radio wave is 1000 MHz has been described, but it has been confirmed that the same tendency is exhibited even when the radio wave frequency is different.

  Therefore, when the frequency of the radio wave received by the folded dipole antenna 100 is represented by F (MHz) and the radius r is expressed by the following formula, (0.33 (mm) × F (MHz)) / 1000 (MHz) <r (mm) Becomes From the above, it was found that the radius r should be (0.33 × F) / 1000 <r.

Figure 7 is a graph showing the characteristics of the step-up ratio n ² with respect to distance h in the folded dipole antenna 100. Here, the length L of the main body 111 was 150 mm, and the radii r1 and r2 were both 0.125 mm. The radio wave received by the folded dipole antenna 100 was 1000 MHz.

  The interval h is the interval (the shortest distance) between the element 120 and the main body 111 of the element 110 in the folded dipole antenna 100.

Was shaken apart h from 1mm to 12 mm, consisting of the below step-up ratio ^{n 2} is 137 to 300, distance h is in the range from 1mm to 2.5 mm. For this reason, it turned out that the space | interval h is preferable in the range of 1 mm-2.5 mm.

  1 mm at 1000 MHz corresponds to 1/30 of the electrical length λe, and 2.5 mm corresponds to 1/12 of the electrical length λe. For this reason, it turned out that the interval h should just be λe / 30 ≦ h ≦ λe / 12.

  Here, the simulation result in the case where the received radio wave is 1000 MHz has been described, but it has been confirmed that the same tendency is exhibited even when the radio wave frequency is different. Therefore, even if the frequency is other than 1000 MHz, the interval h may be λe / 30 ≦ h ≦ λe / 12.

FIG. 8 is a diagram illustrating a simulation result of the folded dipole antenna 100. Under the condition that the folded dipole antenna 100 receives a radio wave of 1000 MHz, the length L in the Y-axis direction of the main body 111 of the element 110, the radius r1 of the main body 111, the radius r2 of the element 120, and the distance between the main body 111 and the element 120 When the interval h is set to a value as shown in Example 3 in FIG. 8, the impedance R ₀ (Ω) of the folded dipole antenna 100 viewed from the feeding points 121A and 121B is 32.0 kΩ, and the bandwidth BW is 0.5%. Met.

Although the radius r1 of the main body 111 and the radius r2 of the element 120 are larger than those of the examples 1 and 2 shown in FIG. 4, mainly because the radius r1 of the main body 111 is increased, the coupling between the element 110 and the element 120 increases. It is considered that the impedance _R0 is larger than in Examples 1 and 2 shown in FIG.

  If the folded dipole antenna 100 is configured to receive 920 MHz and 2.45 GHz radio waves, the dimensions of each part are as shown in FIG.

  The length L between the ends 111MA and 111MB of the main body portions 111M-1 to 111M-4 is 163 mm at 920 MHz, 61 mm at 2.45 GHz, and the interval wf between the feeding points 121A and 121B is 5.4 mm at 920 MHz. 2 mm at 45 GHz, the radius r1 of the main parts 111M-1 to 111M-4 is 0.135 mm at 920 MHz, 0.05 mm at 2.45 GHz, and the distance h between the main parts 111M-1, 111M-2 and the element 120 is: At 920 MHz, it was 6.5 mm, and at 2.45 GHz, it was 2.44 mm. The interval between the main units 111M-1 and 111M-4 and the interval between the main units 111M-2 and 111M-3 are both 2 h.

  As described above, according to the embodiment, by including three (three) or more elements 110 arranged around the element 120, the folded dipole antenna having an extremely large impedance viewed from the feeding points 121A and 121B. 100 were obtained. This is because increasing the number of the elements 110 increases the coupling with the elements 120.

  Therefore, according to the embodiment, power converter 300 having a sufficiently large impedance can be provided.

  In the above description, the form in which the angle θ in the circumferential direction between the main bodies 111 of the elements 110 of the folded dipole antenna 100 is equal to each other is not necessarily equal. However, from the viewpoint of increasing the coupling between the three or more elements 110 and the elements 120, the three or more elements 110 are not arranged such that the main body 111 is arranged on the same plane (two-dimensionally). Preferably, they are arranged three-dimensionally.

  In the above description, a configuration in which the connection portions 112 and 113 of the element 110 are connected to the main body 111 at an angle of 90 degrees and connected to the element 120 at an angle of 90 degrees has been described. However, the connection portions 112 and 113 may be configured to be connected to the main body 111 or the element 120 at an angle other than 90 degrees.

  Further, the connection portions 112 and 113 may be curved instead of being straight. Further, the main body 111 is not limited to a linear shape, and may have a shape in which the ends 111A and 111B are curved.

  Further, the connection portions 112 and 113 may be connected to the main body 111 at positions offset toward the center from the ends 111A and 111B of the main body 111. Similarly, the connection portions 112 and 113 may be connected to the element 120 at a position offset toward the center from the ends 122A and 122B of the element 120.

  Also, when there are N elements 110 as shown in FIG. 1, the connection portions 112 and 113 of one element 110 are connected to the ends 122A and 122B of the element 120, and the remaining N-1 elements 110 May be connected to the ends 122A, 122B of the element 120 via the connections 112, 113 of one element 110.

  Further, in the above, the embodiment in which the number N of the elements 110 is 3 or more has been described, but the upper limit of the number N of the elements 110 may be 10. This is because if there are ten elements 110, a sufficiently high connection with the element 110 is obtained, and if the number of elements is less than ten, the production is easier. The radiation efficiency when the number of the elements 110 is 10 is about 80% of the radiation efficiency when the number of the elements 110 is three, which is a practical lower limit in consideration of practicality. This is because the radiation efficiency is further reduced.

  Note that the folded dipole antenna 100 may be modified as shown in FIGS. 10 to 13 below.

  FIG. 10 is a diagram illustrating a power conversion device 300M1 including the folded dipole antenna 100M1 according to the embodiment. FIG. 10A shows an exploded view, and FIG. 10B shows an assembled state. Hereinafter, the description will be made using the XYZ coordinate system.

  Power conversion device 300M1 includes folded dipole antenna 100M1 and rectifier circuit 200. The folded dipole antenna 100M1 is mounted on the substrates 130A and 130B, and is different from the folded dipole antenna 100 of FIG. 1 in that the folded dipole antenna 100M1 is configured by a metal foil formed on the surfaces of the substrates 130A and 130B.

  The substrates 130A and 130B are substrates having low dielectric loss such as, for example, a Teflon (registered trademark) substrate or a PPE (Polyphenylene Ether: polyphenylene ether) substrate. Further, the substrates 130A and 130B are not limited to the Teflon substrate or the PPE substrate, but may be, for example, a wiring substrate of FR-4 (Flame Retardant type 4) standard, a substrate of another type, or a flexible substrate.

  The substrate 130A is parallel to the XY plane and has a thickness in the Z-axis direction. The substrate 130A has a notch 131A provided at the center of the width in the X-axis direction at the end on the Y-axis negative direction side, and a notch provided at the center of the width in the X-axis direction at the end on the Y-axis positive direction side. 132A.

  The substrate 130B is parallel to the YZ plane and has a thickness in the X-axis direction. The substrate 130B has a slit 131B penetrating in the X-axis direction at the center of the width in the Z-axis direction from the Y-axis negative direction side to the Y-axis positive direction side. The length of the slit 131B in the Y-axis direction corresponds to the length between the notches 131A and 132A of the substrate 130A. The width of the slit 131B in the Z-axis direction corresponds to the thickness of the substrate 130A in the Z-axis direction. The thickness of the substrates 130A and 130B is 0.5 mm, for example.

  The folded dipole antenna 100M1 has four elements 110 and one element 120. The same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. When the four elements 110 are distinguished, they are referred to as 110-1 to 110-4.

  The elements 110-1 and 110-3 and the element 120 are provided on the surface of the substrate 130A on the positive Z-axis direction side. The elements 110-1 and 110-3 and the element 120 are produced, for example, by patterning a copper foil provided on the surface of the substrate 130A.

  The elements 110-1 and 110-3 and the element 120 connect the connecting portions 112 of the elements 110-1 and 110-3, and the center of the width in the X-axis direction of the rectangular annular pattern connecting the connecting portions 113. Then, patterning is performed so as to connect the ends 122A and 122B of the element 120.

  An end 122A of the element 120 is connected to a connection point (a portion located near the notch 132A) between the connection portions 112 of the rectangular annular elements 110-1 and 110-3. The end 122B of the element 120 is connected to the connection points (portions located near the cutouts 131A) of the connection portions 113 at −3.

  The elements 110-2 and 110-4 are provided on the surface of the substrate 130B on the X-axis positive direction side. The elements 110-2 and 110-4 are connected to each other and connect the connecting parts 112 of the elements 110-2 and 110-4, and are patterned into a rectangular ring connecting the connecting parts 113.

The line width w1 of the element 110 indicates the element width, and the line width w1 corresponds to twice the radius r1 of the main body 111 of the element 110 shown in FIGS. Similarly, the line width w2 of the element 120 indicates the element width, and the line width w2 corresponds to twice the radius r2 of the element 120 shown in FIGS.
In addition, the thickness of the elements 110-1 to 110-4 is, for example, 18 μm.

  The sizes of the substrates 130A and 130B in plan view are equal to each other, and are the sizes that can arrange the rectangular annular patterns of the elements 110-1 and 110-3 and the rectangular annular patterns of the elements 110-2 and 110-4, respectively. Should be fine.

  Thus, the substrate 130A provided with the elements 110-1 and 110-3 and the element 120 is inserted into the slit 131B of the substrate 130B, and the cutout 131A of the substrate 130A is placed on the Y axis negative direction side of the slit 131B of the substrate 130B. By inserting the notch 132A into the slit 131B in a state in which it is engaged with the ends of the substrates 130A and 130B, the substrates 130A and 130B can be assembled as shown in FIG.

  In addition, in order to secure electrical connection between the end portion 122A of the element 120 and the connection point between the connection portions 112 of the elements 110-2 and 110-4, this portion may be joined with solder. Similarly, in order to secure an electrical connection between the end portion 122B of the element 120 and the connection point between the connection portions 113 of the elements 110-2 and 110-4, this portion may be joined with solder.

Incidentally, the on impedance _{R 0} as shown in FIG. 6 becomes higher 10kΩ in the folded dipole antenna 100, since it is sufficient step-up ratio ^{n 2} is 137 or more, it is sufficient radius r or more 0.33mm , 0.33 mm correspond to 1/90 of the electrical length λe at 1000 MHz. Incidentally, the electrical length λe is the wavelength of an electromagnetic wave transmitted in a transmission medium such as the elements 110 and 120 provided on the substrates 130A and 130B, and the shortening rate varies depending on the relative permittivity of the substrates 130A and 130B. By this shortening rate, 1/90 of λe of the electrical length λe is shortened. Therefore, the folded dipole antenna 100M1 of the present embodiment can be reduced in size.

  FIG. 11 is a diagram illustrating a power conversion device 300M2 including the folded dipole antenna 100M2 according to the embodiment. FIG. 11A shows an exploded view, and FIG. 11B shows an assembled state. Hereinafter, the description will be made using the XYZ coordinate system.

  The folded dipole antenna 100M2 has a configuration in which the substrate 130B is removed from the folded dipole antenna 100M1 shown in FIG. In this case, the elements 110-2 and 110-4 may be made of a rigid metal member such as a wire. The elements 110-2 and 110-4 may be, for example, a metal foil or the like formed on an inner surface of a casing (not shown).

  Further, a configuration such as a folded dipole antenna 100M3 shown in FIG. 12 may be used. The folded dipole antenna 100M3 is provided with a rectifier circuit 200 at the center of one of the four surfaces having the same shape among the six surfaces of the rectangular parallelepiped housing 130M, and has four sides serving as boundaries between the four surfaces having the same shape. Has a configuration in which columnar main portions 111M-1 to 111M4 of the element 110M are arranged. The four main units 111M-1 to 111M4 are connected by four connecting units 112M and 113M corresponding to the connecting units 112 and 113 in FIG.

  Of the main bodies 111M-1 to 111M4, the main bodies 111M-1 and 111M-2 have a configuration closer to the element 120 than the main bodies 111M-3 and 111M-4.

  Further, as in a dipole antenna 100M4 shown in FIG. 13A, three elements 110M, an element 120, and a flexible substrate 150 may be provided and rounded into a column shape as shown in FIG. 13B.

  As described above, the power conversion device according to the exemplary embodiment of the present invention has been described. However, the present invention is not limited to the specifically disclosed embodiment, and does not depart from the scope of the claims. Various modifications and changes are possible.

100, 100M1, 100M2, 100M3, 100M4 Folded dipole antenna 110, 110M, 120, 120A, 120B Element 111, 111M-1 to 111M4 Body 112, 113 Connection 121A, 121B Feeding point 122A, 122B End 200 Rectifier circuit 300 Power converter

Claims (10)

Three or more first conductors, each of the first conductors having a length corresponding to a half wavelength of a free space wavelength at a frequency of a radio wave to be received, and a first conductor connected to one end of the main body. Three or more first conductors having one connection part and a second connection part connected to the other end of the main body part, and arranged to be spatially adjacent to each other;
A first element that is located in a space surrounded by the main bodies of the three or more first conductors, extends from a first feeding point, and is connected to a first connection part of the three or more first conductors; A second element extending from the first power supply point and a second power supply point forming a balanced terminal and connected to a second connection portion of the three or more first conductors. And a second conductor forming a folded dipole antenna;
And a rectifier circuit connected to the first feeding point and the second feeding point.   2. The power converter according to claim 1, wherein the impedance when viewing the second conductor and the three or more first conductors from the rectifier circuit is 10 kΩ or more. 3.   The power converter according to claim 1, wherein the number of the first conductors is 10 or less.   4. The device according to claim 1, wherein r1 / r2 ≧ 1 where r1 is a first line width of the main body of each of the three or more first conductors and r2 is a line width of the second conductor. 5. Item 3. The power converter according to item 1.   The width r of the first conductor and the second conductor is (0.33 × F) / 1000 <r, where F (MHz) is a frequency of a radio wave to be received. Item 3. The power converter according to item 1.   The distance h between the main bodies of the three or more first conductors is λe / 30 <h <λe / 12, where λe is the electrical length at the frequency of the radio wave to be received. The power converter according to claim 1. The first element and the second element of the second conductor extend linearly,
In each of the first conductors, the first connection portion extends in a direction at a predetermined angle with respect to an extension direction of the second conductor, and the main body portion extends along the second conductor, The power converter according to claim 1, wherein the second connection portion extends at the predetermined angle with respect to an extending direction of the second conductor.   The power converter according to claim 7, wherein a main body of the first conductor is parallel to the second conductor.   9. The power converter according to claim 7, wherein the predetermined angle is 90 degrees.   The three or more first conductors are arranged at an equal angle on the same circumference with respect to the second conductor as viewed from an extending direction of the main body of the first conductor. The power converter according to any one of claims 1 to 4.

Images