CN104269619A - Planar dipole antenna with notch reflector - Google Patents

Abstract

The invention relates to a planar dipole antenna with a notch reflector. The 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 two open-ended double-wire transmission lines (7) which are identical in length. The conduction band and the ground of the each double-wire transmission line are connected with the conduction band (3) and the ground (4) of the feed transmission line respectively at a loading point (9) of the notch reflector. The notch reflector loaded by the planar dipole antenna can be used as a reflector within the working frequency band of the antenna to increase the antenna gain, 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

Planar dipole antenna with notch reflector

technical field

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

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. 

Contents of the invention

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

Technical solution: The 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, the feed transmission line and the notch reflector are all 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, respectively connected to the conduction band of the feed transmission line and the ground at the end of the feed transmission line The notch reflector is composed of two double-wire transmission lines with open terminals. The conduction band and ground of the double-wire transmission line are printed on both sides of the dielectric substrate respectively; the loading point of the notch reflector is located between the input end and the end of the feeder transmission line At the loading point of the notch reflector, two double-wire transmission lines with open terminals are symmetrically placed on both sides of the feeder transmission line, and their stretching direction is parallel to the stretching direction of the dipole radiation patch. The conduction band of the double-wire transmission line and ground are connected to the conduction band and ground of the feeder transmission line, respectively.

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

The lengths of the two double-wire transmission lines of the notch reflector are equal, and the length is about a quarter of the notch wavelength, so as to suppress the radiation of the antenna in a certain notch frequency band. the

The length of each section of the two-line transmission line of the notch reflector is longer than the length of the vibrator radiation patch, so as to realize the function of the reflector; and the distance between the loading point of the notch reflector and the end of the feeding transmission line Tuning is performed around approximately a quarter of the operating wavelength to achieve both optimal reflector characteristics and matching performance. the

In the notch frequency band lower than the operating frequency of the antenna, since the two sections of the two-wire transmission line of the notch reflector are open-circuited, and the length of each section is about a quarter of the notch wavelength, the notch reflection on the feed transmission line The loading point of the reflector, looking in the direction of each two-wire transmission line, its input impedance is zero, so at the loading point of the notch reflector on the feeder transmission line, the total input impedance is zero. Therefore, the 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 antenna radiation in this frequency band forms a notch characteristic. In the working frequency band of the antenna, the length of the two double-wire transmission lines forming the notch reflector will be 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 its reflector characteristics , so that the antenna gain is improved. the

The length of the two two-wire transmission lines forming the notch reflector determines the operating frequency corresponding to the notch characteristic. Therefore, adjusting the length of the two two-wire transmission lines can directly adjust the notch frequency of the notch reflector. 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 operating frequency of the dipole antenna, the spacing between the loading point of the notch reflector and the end of the feed transmission line is tuned around approximately a quarter of the operating wavelength to simultaneously achieve optimal reflector characteristics and matching performance. the

Beneficial effect: the beneficial effect of the present invention is, the planar dipole antenna of the notch reflector proposed, its notch reflector can be used as reflector in the working frequency band of antenna, improves the gain of antenna, simultaneously notch reflector It also has a notch function, which can filter out the interference of signals in the notch frequency band to the antenna, 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 schematic structural view 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 Terminal 8, the loading point of the notch reflector 9, the end 10 of the feeder transmission line. 

Detailed ways

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

The technical scheme adopted in the present invention is: the planar dipole antenna of the notch reflector includes two vibrator radiation patches 1, feeder transmission line 2, dielectric substrate 5 and notch reflector 6; vibrator radiation patch 1, feeder Both the electric transmission line 2 and the notch reflector 6 are on the dielectric substrate 5; the shape of the two vibrator radiation patches 1 is rectangular, and the two vibrator radiation patches 1 are printed on both sides of the dielectric substrate 5 in an antipodal shape. The conduction band 3 and the ground 4 of the feed transmission line are connected at the end 10 of the feed transmission line; the notch reflector 6 is composed of two double-wire transmission lines 7 with open terminals, and the conduction band and ground of the double-wire transmission line 7 are printed on the dielectric substrate 5; the loading point 9 of the notch reflector is located between the input end 8 and the end 10 of the feeder transmission line 2; at the loading point 9 of the notch reflector, two sections of open-circuited double-wire transmission lines 7 are symmetrically placed respectively Both sides of the feeding transmission line 2 extend in parallel to the extending direction of the dipole radiation patch 1 , and the conduction band and ground of the double-wire transmission line 7 are respectively connected to the conduction band 3 and the ground 4 of the feeding transmission line 2 . The width of the ground 4 of the feed transmission line 2 is the widest at the input end 8, and then gradually narrows to become the same width as the conduction band 3 of the feed transmission line 2 between the input end 8 and the loading point 9 of the notch reflector . The lengths of the two sections of the two-wire transmission line 7 of the notch reflector 6 are equal, and the length is about a quarter of the notch wavelength, so as to suppress the radiation of the antenna in a certain notch frequency band. The length of each section of the two-line transmission line 7 of the notch reflector 6 is longer than the length of the vibrator radiation patch 1, so as to realize the effect of the reflector; and between the loading point 9 of the notch reflector and the end 10 of the feeder transmission line The pitch is tuned around approximately a quarter of the operating wavelength to simultaneously achieve optimal reflector characteristics and matching performance. the

In the notch frequency band lower than the working frequency, since the two sections of the notch reflector are open-circuited at the end of the two-wire transmission line, and the length of each section is about a quarter of the notch wavelength, the notch reflector on the feeder transmission line When viewed from the direction of each double-wire transmission line, its input impedance is zero, and after it is connected in parallel with the input impedance of the radiation patch of the antenna oscillator, the total input impedance here is zero. At this time, the dipole antenna loaded with a notch reflector is equivalent to a transmission line with a terminal short circuit, so the input signal of the antenna will be totally reflected, thereby suppressing the antenna radiation in this frequency band and forming a notch characteristic. In the working frequency band of the antenna, the length of each two-wire transmission line of the notch reflector is greater than a quarter of the working wavelength, that is, greater than the length of the antenna's oscillator radiation patch, and can be used as a reflector. the

In order to ensure the notch and reflection characteristics at the same time, the length of the notch reflector 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 can be adjusted by adjusting the notch reflection The length of each two-wire transmission line of the device can be adjusted. As a reflector, the gain increase provided by the loaded dual-wire transmission line can be adjusted by adjusting the distance between the radiation patch and the antenna dipole. In theory, when the distance between the two is about a quarter of a wavelength, the antenna gain will be get the maximum improvement. the

Structurally, the planar dipole antenna of the notch reflector is composed of a dipole radiation patch 1, a feeding transmission line 2, a dielectric substrate 5 and a notch reflector 6, wherein the conduction band 3 of the feeding transmission line 2 and the ground 4 They are respectively printed on both sides of the dielectric substrate 5, and the two vibrator radiation patches 1 are also printed on both sides of the dielectric substrate 5 in an antipodal shape. Conductor strip 3 is connected to ground 4 . The notch reflector 6 is placed between the input end 8 and the end 10 of the feeder transmission line, and the loading point 9 of the notch reflector is composed of two open-ended double-wire transmission lines 7 of equal length, each double-wire transmission line 7 The conduction strip 3 and the ground are printed on both sides of the dielectric substrate 5 respectively, and are respectively connected to the conduction strip 3 and the ground 4 of the feeder transmission line 2 . The width of the conduction band 3 of the microstrip-dual-wire fed transmission line remains unchanged in both the microstrip transmission line section and the dual-wire transmission line section. 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 loading point 9 of the notch reflector and the feed transmission line Between the ends 10 , the width of the ground 4 of the feeding transmission line is consistent with the width of the conduction band 3 , forming a double-wire transmission line, which is convenient for feeding the oscillator radiation patch 1 . Between the input end 8 of the feeding transmission line and the loading point 9 of the notch reflector, the width of the ground 4 can be linear or arc-shaped. The shape of the two dipole radiation patches 1 can be a rectangular strip, or a rectangular strip with sawtooth edges, etc. The length of each section of the two-wire transmission line 7 of the notch reflector 6 is longer than the length of each vibrator radiation patch 1, so that the notch reflector 6 can be used as a reflector in the working frequency band of the antenna; its length is determined by the notch frequency band The frequency is about a quarter of the wavelength corresponding to the notch frequency. the

In manufacturing, the manufacturing process of the planar dipole antenna of the notch reflector can adopt semiconductor process, ceramic process, laser process or printed circuit process. The planar dipole antenna of the notch reflector is composed of the dipole radiation patch 1, the feeding transmission line 2, the dielectric substrate 5 and the notch reflector 6, wherein the dipole radiation patch 1, the conduction band 3 of the feeding transmission line 2 The ground 4 , and the conduction band and ground of each section of the two-wire transmission line 7 of the notch reflector 6 are all made of conductive material with good electrical conductivity and 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 each section of the two-wire 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 4 of the feeder transmission line 2 at the loading point 9 of the notch reflector . the

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

Claims (4)

1. A planar dipole antenna of a notch reflector, characterized in that the planar dipole antenna of the notch reflector comprises two vibrator radiation patches (1), feed transmission line (2), dielectric 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 (1 ) is rectangular in shape, and two vibrator radiation patches (1) are printed on both sides of the dielectric substrate (5) in antipodal shape, and are respectively connected to the conduction band (3) and ground (4) of the feed transmission line in the feed The ends (10) of the transmission line are connected; the notch reflector (6) is composed of two double-wire transmission lines (7) with open terminals, and the conduction band and ground of the double-wire transmission line (7) are printed on the dielectric substrate (5) respectively. Both sides; the notch reflector loading point (9) is located between the input end (8) and the end (10) of the feeder transmission line (2); at the notch reflector loading point (9), two open-ended double lines The transmission line (7) is symmetrically placed on both sides of the feed transmission line (2), and its stretching direction is parallel to the stretching direction of the oscillator radiation patch (1). The conduction band (3) of the electrical transmission line (2) is connected to the ground (4). 2. The planar dipole antenna of the notch reflector according to claim 1, characterized in that the width of the ground (4) of the feeding transmission line (2) is the widest at the input end (8), and then gradually Narrows to the same width as the conduction band (3) of the feeder transmission line (2) between the input end (8) and the loading point (9) of the notch reflector. 3. The planar dipole antenna of the notch reflector according to claim 1, characterized in that the lengths of the two double-wire transmission lines (7) of the notch reflector (6) are equal, and the length is about It is a quarter of the notch wavelength, so as to suppress the radiation of the antenna in a certain notch frequency band. 4. The planar dipole antenna of the notch reflector according to claim 1, characterized in that the length of each section of the two-wire transmission line (7) of the notch reflector (6) is shorter than that of the vibrator radiation patch ( 1) The length of the notch reflector should be long to realize the effect of the reflector; and the distance between the loading point (9) of the notch reflector and the end (10) of the feeder transmission line is tuned around a quarter of the working wavelength , to simultaneously achieve better reflector characteristics and matching performance.