CN104269620A - Broadband planar dipole antenna with notch reflector - Google Patents

Abstract

The invention relates to a broadband planar dipole antenna with a notch reflector. The broadband planar dipole antenna with the notch reflector is composed of two vibrator radiation patches (1), a feed transmission line (2), a dielectric substrate (5) and the notch reflector (6), wherein the two vibrator radiation patches are printed on the two sides of the dielectric substrate (5) in an antipodal shape, and each vibrator radiation patch is connected with the conduction band (3) and the ground (4) of the feed transmission line at the tail end (10) of the feed transmission line. The notch reflector (6) is composed of a left open-ended double-wire open-circuit line (11) and a right open-ended double-wire open-circuit line (12), wherein the left open-ended double-wire open-circuit line (11) and the right open-ended double-wire open-circuit line (12) are identical in length. The conduction band and the ground of the left open-ended double-wire open-circuit line are connected with the conduction band (3) and the ground (4) of the feed transmission line respectively at a first loading point (9) of the notch reflector, and the conduction band and the ground of the right open-ended double-wire open-circuit line are connected with the conduction band (3) and the ground (4) of the feed transmission line respectively at a second loading point (13) of the notch reflector. The notch reflector of the broadband planar dipole antenna can increase the antenna gain within the working frequency band of the antenna, and meanwhile the notch reflector can be used as a filter within the notch frequency band lower than the working frequency band to restrain radiation of the antenna.

Description

Broadband planar dipole antenna with notch reflector

technical field

The invention relates to an antenna, in particular to a broadband planar dipole antenna of a notch reflector, and belongs to the technical field of antenna manufacturing. the

Background technique

As an important front-end device in a wireless communication system, the antenna can not only radiate or receive useful radio frequency signals, but also radiate or receive indiscriminately for other useless or harmful signals falling within its working frequency band. In some cases, this situation will cause greater interference to the antenna transceiver system, such as image frequency signal interference in a superheterodyne receiver. Due to its high sensitivity and selectivity, the superheterodyne structure is widely used in modern communication systems and radar systems, so image frequency suppression measures are essential. A common solution is to insert an image filter in the radio frequency circuit to filter out the image frequency signal in the received signal. This reduces the performance of the system to a certain extent, increases the burden of the system, and increases the cost requirement at the same time. Antennas with notch or filtering characteristics can filter some specific frequency bands, and have both the functions of antennas and filters, which is an effective way to solve this problem. the

As a microstrip antenna, the dipole antenna has the advantages of low profile, low cost, small size, light weight, and easy integration with the circuit board. At the same time, the size of the dipole radiation patch is small. The application is very extensive. However, its gain is low, so it is not suitable for some occasions with high gain requirements. the

Contents of the invention

Technical problem: the object of the invention is to propose a broadband planar dipole antenna of a notch reflector, the notch reflector of the antenna both has the effect of a broadband reflector, so that the gain in the antenna operating frequency band is improved, and also has The notch characteristic makes the radiation of the antenna in a certain frequency band lower than the operating frequency of the antenna suppressed, and the antenna structure is simple and the size is small.

Technical solution: The broadband planar dipole antenna of the notch reflector of the present invention includes two dipole radiation patches, a feed transmission line, a dielectric substrate and a notch reflector; the vibrator radiation patch, a feed transmission line and a notch reflector Both are on the dielectric substrate; the shape of the two vibrator radiation patches is rectangular, and the two vibrator radiation patches are printed on both sides of the dielectric substrate in an antipodal shape, and are respectively connected to the conduction band of the feed transmission line and the ground of the feed transmission line. The ends of the feeding transmission line are connected; the notch reflector is composed of two equal-length, open-ended left double-wire open lines and right double-wire open lines; the conduction band and the ground of the double-wire transmission line are printed separately On both sides of the dielectric substrate, the left double-wire open line and the right double-wire open line are respectively placed on both sides of the feeding transmission line, and their stretching direction is parallel to the stretching direction of the oscillator radiation patch; the first loading point of the notch reflector and The second loading point of the notch reflector is located between the input end of the feeder transmission line and the end of the feeder transmission line. The conduction band of the electric transmission line is connected to the ground of the feeder transmission line, and at the second loading point of the notch reflector, the conduction band and ground of the double-wire open line on the right are respectively connected to the conduction band of the feeder transmission line and the ground of the feeder transmission line.

The width of the ground of the feed transmission line is the widest at the input end of the feed transmission line, and then gradually narrows, and becomes the same as the feed transmission line between the input end of the feed transmission line and the first loading point of the notch reflector. the same width as the conduction band. the

The lengths of the left two-wire open line and the right two-line open line are both a quarter of the wavelength of the notch frequency band, so as to suppress the radiation of the antenna in the notch frequency band

The lengths of the left double-wire open line and the right double-wire open line of the double-wire transmission line are both longer than the length of the vibrator radiation patch, so as to realize the function of the reflector; and the first loading point of the notch reflector and the feeder The spacing between the ends of the electrical transmission line is tuned around approximately one quarter of the maximum operating wavelength, and the spacing between the second loading point of the notch reflector and the end of the feed transmission line is approximately one quarter of the minimum operating wavelength Tuning around wavelengths to simultaneously achieve optimal reflector characteristics and matching performance.

In the notch frequency band lower than the operating frequency of the antenna, since the left double-wire open line and the right double-wire open line are both terminal open circuits, and the lengths of the left double-wire open line and the right double-wire open line are four times the wavelength of the notch frequency band. Therefore, at the first loading point and the second loading point of the notch reflector on the feeding transmission line, in the notch frequency band, the input impedances of the left double-wire open line and the right double-wire open line are zero, so At the first loading point and the second loading point of the notch reflector on the feeding transmission line, the total input impedance is zero. Therefore, the broadband planar dipole antenna of the notch reflector is equivalent to a short-circuited transmission line in the notch frequency band, and the input signal of the antenna is totally reflected back to the input end at the loading point of the notch reflector on the feeding transmission line, thereby suppressing The radiation of the antenna in this frequency band forms a notch characteristic. In the working frequency band of the antenna, the lengths of the left two-wire open line and the right two-wire open line are both greater than a quarter of the working wavelength, which is greater than the length of the radiation patch of the antenna oscillator, so the notch reflector can realize the characteristics of its reflector , so that the antenna gain is improved. the

The length of the left double-wire open line and the right double-wire open line determines the corresponding operating frequency of the notch characteristic. Therefore, adjusting the length of the left double-line open line and the right double-line open line can directly adjust the notch reflector notch frequency. the

The working frequency of the dipole antenna is determined by the length of the dipole radiation patch. Therefore, adjusting the length of the dipole radiation patch can directly adjust the working frequency of the antenna. the

Corresponding to the working frequency band of the dipole antenna, the distance between the first loading point of the notch reflector and the end of the feeding transmission line is about a quarter wavelength of the low frequency end of the working frequency band, and the second loading point of the notch reflector The distance between the end of the feeding transmission line and the end of the feeding transmission line is about a quarter wavelength of the high frequency end of the working frequency band, so that the working bandwidth is broadened, and good reflector performance and matching performance can be achieved in a wider frequency band at the same time. the

Beneficial effect: the beneficial effect of the present invention is, the broadband planar dipole antenna of proposed notch reflector, its notch reflector can be used as reflector in the wider working frequency band of antenna, improves the gain of antenna, traps simultaneously The wave reflector also has a notch function, which can filter out the interference of signals to the antenna in the notch frequency band, and the gain of the antenna in the notch frequency band is strongly suppressed, and the size of the antenna is compact.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention. the

In the figure, there are: oscillator radiation patch 1, feeding transmission line 2, conduction band 3 of feeding transmission line, ground 4 of feeding transmission line, dielectric substrate 5, notch reflector 6, double-wire transmission line 7, input of feeding transmission line End 8, the first loading point 9 of the notch reflector, the end 10 of the feeding transmission line, the double-wire open line 11 on the left, the double-wire open line 12 on the right, the second loading point 13 of the notch reflector. the

Detailed ways

Below in conjunction with accompanying drawing and embodiment the present invention will be further described. the

The technical solution adopted in the present invention is: the broadband planar dipole antenna of the notch reflector comprises two vibrator radiation patches 1, feed transmission line 2, dielectric substrate 5 and notch reflector 6; the vibrator radiation patch 1, Both the feeding transmission line 2 and the notch reflector 6 are on the dielectric substrate 5; the shape of the two oscillator radiation patches 1 is rectangular, and the two oscillator radiation patches 1 are printed on both sides of the dielectric substrate 5 in an antipodal shape, respectively Connect with the conduction band 3 of the feeder transmission line and the ground 4 of the feeder transmission line at the end 10 of the feeder transmission line; the notch reflector 6 consists of two sections of equal length, open-ended left double-wire open line 11 and right double-wire open line 12 constitutes a double-wire transmission line 7; the conduction band and ground of the double-wire transmission line 7 are printed on both sides of the dielectric substrate 5, and the left double-wire open line 11 and the right double-wire open line 12 are respectively placed on the two sides of the feeder transmission line 2 side, its stretching direction is parallel to the stretching direction of the vibrator radiation patch 1; the first loading point 9 of the notch reflector and the second loading point 13 of the notch reflector are both located at the input end 8 of the feeding transmission line 2 and the feeding Between the ends 10 of the transmission line, at the first loading point 9 of the notch reflector, the conduction band and the ground of the left double-wire open line 11 are respectively connected with the conduction band 3 of the feeder transmission line 2 and the ground 4 of the feeder transmission line. The second loading point 13 of the notch reflector, the conduction band and the ground of the right two-wire open line 12 are respectively connected to the conduction band 3 of the feeder transmission line 2 and the ground 4 of the feeder transmission line. The width of the ground 4 of the feed transmission line 2 is the widest at the input end 8 of the feed transmission line 2, and then gradually narrows to become between the input end 8 of the feed transmission line 2 and the first loading point 9 of the notch reflector. The same width as the conduction band 3 of the feeding transmission line 2. The lengths of the left double-wire open line 11 and the right double-wire open line 12 are both a quarter of the wavelength of the notch frequency band, so as to suppress the radiation of the antenna in the notch frequency band. The length of the left double-line open line 11 and the right double-line open line 12 of the double-line transmission line 7 is longer than the length of the vibrator radiation patch 1, so as to realize the effect of the reflector; and the first loading point 9 of the notch reflector and The spacing between the ends 10 of the feeder transmission line is tuned around a quarter of the maximum operating wavelength, and the spacing between the second loading point (13) of the notch reflector and the end (10) of the feeder transmission line is at Tuning is performed around a quarter of the minimum operating wavelength to achieve both good reflector characteristics and matching performance. the

In the notch frequency band lower than the operating frequency of the antenna, since the left double-wire open line and the right double-wire open line are both terminal open circuits, and the lengths of the left double-wire open line and the right double-wire open line are four times the wavelength of the notch frequency band. Therefore, at the first loading point 9 and the second loading point 13 of the notch reflector on the feeding transmission line, in the notch frequency band, the input impedances of the left double-wire open line and the right double-wire open line are respectively zero , so the total input impedance is zero at the loading point of the notch reflector on the feeding transmission line. Therefore, the broadband planar dipole antenna of the notch reflector is equivalent to a short-circuited transmission line in the notch frequency band, and the input signal of the antenna is totally reflected back to the input end at the loading point of the notch reflector on the feeding transmission line, thereby suppressing The radiation of the antenna in this frequency band forms a notch characteristic. In the working frequency band of the antenna, the lengths of the left two-wire open line and the right two-wire open line are both greater than a quarter of the working wavelength, which is greater than the length of the radiation patch of the antenna oscillator, so the notch reflector can realize the characteristics of its reflector , so that the antenna gain is improved, and the optimal antenna gain can be obtained by adjusting the distance between the notch reflector and the dipole radiation patch. the

In order to ensure the notch and reflection characteristics at the same time, the length of the left double-wire open line and the right double-wire open line should be greater than the length of the radiation patch of the antenna oscillator, so the notch frequency should be lower than the antenna operating frequency, and the notch frequency The size of can be adjusted by adjusting the lengths of the left double-line open line and the right double-line open line of the notch reflector. the

Corresponding to the working frequency band of the dipole antenna, the distance between the first loading point of the notch reflector and the end of the feeding transmission line is about a quarter wavelength of the low frequency end of the working frequency band, and the second loading point of the notch reflector The distance between the end of the feeding transmission line and the end of the feeding transmission line is about a quarter wavelength of the high frequency end of the working frequency band, so that the working bandwidth is broadened, and good reflector performance and matching performance can be achieved in a wider frequency band at the same time. the

Structurally, the width of the conduction band 3 of the feed transmission line of the broadband planar dipole antenna of the notch reflector remains unchanged in both the microstrip transmission line part and the double line transmission line part. The width of the ground 4 of the feed transmission line is wider at the input end 8 of the feed transmission line, so that the input end is a microstrip line, which is convenient to be connected with the feed coaxial line; at the first loading point 9 of the notch reflector and the feed Between the ends 10 of the transmission lines, the width of the ground 4 of the feeding transmission line is consistent with the width of the conduction band 3 , forming a double-line transmission line, which is convenient for feeding the oscillator radiation patch 1 . Between the input end 8 of the feeding transmission line and the first loading point 9 of the notch reflector, the width of the ground 4 can be linearly or gradually changed in an arc shape. The shape of the two dipole radiation patches 1 can be a rectangular strip, or a rectangular strip with sawtooth edges, etc. the

In manufacturing, the manufacturing process of the broadband planar dipole antenna of the notch reflector can adopt semiconductor process, ceramic process, laser process or printed circuit process. The broadband planar dipole antenna of the notch reflector is composed of the dipole radiation patch 1, the feed transmission line 2, the dielectric substrate 5 and the notch reflector 6, wherein the conduction band of the dipole radiation patch 1 and the feed transmission line 2 3 and ground 4, as well as the conduction band and ground of the two-wire transmission line 7 of the notch reflector 6, are all made of conductive materials with good electrical conductivity, and are printed on the dielectric substrate 5. The dielectric substrate 5 should use a dielectric material with as low a loss as possible. The two patches of the vibrator radiation patch 1 are printed on both sides of the dielectric substrate 5 in an antipodal shape, and are respectively connected to the conduction band 3 and the ground 4 of the microstrip-double-wire feeding transmission line 2 at the end 10 of the feeding transmission line, In order to facilitate feeding through the microstrip-two-wire transmission line. The conduction band and the ground of the left double-line open line 11 and the right double-line open line 12 of the double-line transmission line 7 of the notch reflector 6 are also printed on both sides of the dielectric substrate 5, and are respectively connected to the conduction band 3 and the ground of the feeder transmission line 2. The ground 4 is connected at the first loading point 9 and the second loading point 13 of the notch reflector. the

According to the above, the present invention can be realized. the

Claims (4)

1. A broadband planar dipole antenna of a notch reflector, characterized in that the broadband planar dipole antenna of the notch reflector comprises two vibrator radiation patches (1), a feed transmission line (2), a dielectric The substrate (5) and the notch reflector (6); the oscillator radiation patch (1), the feeding transmission line (2) and the notch reflector (6) are all on the dielectric substrate (5); two oscillator radiation patches The shape of (1) is rectangular, and two vibrator radiation patches (1) are printed on both sides of the dielectric substrate (5) in antipodal shape, respectively connected to the conduction band (3) of the feed transmission line and the ground ( 4) Connected at the end (10) of the feeder transmission line; the notch reflector (6) is a double-wired open line (11) on the left and a double-lined open line (12) on the right (12) consisting of two sections of equal length and open terminals. two-wire transmission line (7); the conduction band and ground of the two-wire transmission line (7) are respectively printed on both sides of the dielectric substrate (5), and the left two-wire open line (11) and the right two-line open line (12) are respectively placed on the The two sides of the feeding transmission line (2), whose extension direction is parallel to the extension direction of the oscillator radiation patch (1); the first loading point (9) of the notch reflector and the second loading point (13) of the notch reflector ) are located between the input end (8) of the feeder transmission line (2) and the end (10) of the feeder transmission line, at the first loading point (9) of the notch reflector, the left double-wire open line (11) The conduction band and the ground are respectively connected to the conduction band (3) of the feeder transmission line (2) and the ground (4) of the feeder transmission line, at the second loading point (13) of the notch reflector, the right double-wire open line (12 ) conduction band and ground are respectively connected to the conduction band (3) of the feeder transmission line (2) and the ground (4) of the feeder transmission line. 2. The broadband planar dipole antenna of the notch reflector according to claim 1, characterized in that the width of the ground (4) of the feed transmission line (2) is at the input end of the feed transmission line (2) (8) is the widest, and then gradually narrows, and becomes the conductance of the feeder transmission line (2) between the input end (8) of the feeder transmission line (2) and the first loading point (9) of the notch reflector with the same width as (3). 3. The broadband planar dipole antenna of the notch reflector according to claim 1, characterized in that the lengths of the left two-wire open line (11) and the right two-wire open line (12) are notch waves A quarter of the wavelength of the frequency band, in order to suppress the radiation of the antenna in the notch frequency band. 4. The broadband planar dipole antenna of the notch reflector according to claim 1, characterized in that the left double-wire open line (11) and the right double-wire open line (12) of the two-wire transmission line (7) ) are longer than the length of the dipole radiation patch (1) to realize the function of the reflector; and the distance between the first loading point (9) of the notch reflector and the end (10) of the feeder transmission line Tuned around approximately one-quarter of the maximum operating wavelength, the spacing between the second loading point (13) of the notch reflector and the end (10) of the feeder transmission line is around approximately one-quarter of the minimum operating wavelength Tuning is performed to simultaneously achieve optimal reflector characteristics and matching performance.