CN104218312A - Broadband bow-tie antenna for dual-band wave trapping reflector - Google Patents

Abstract

The invention relates to a broadband bow-tie antenna with a double-frequency notch reflector. The antenna consists of a bow-tie radiation patch (1), a feeding transmission line (2), a dielectric substrate (5) and a notch reflector (6), in which two bow-tie radiation patches are printed on the dielectric substrate ( 5) are respectively connected to the conduction band (3) of the feeder transmission line and the ground (4) at the end of the transmission line (10). The notch reflector (6) is composed of two open-ended left microstrip lines (11) and right microstrip open lines (12) with different lengths. The point (9) and the second loading point (13) are respectively connected to the conduction band (3) and the ground (4) of the feeding transmission line. The notch reflector of the antenna can increase the gain of the antenna in the working frequency band of the antenna, and can be used as a filter in the two notch frequency bands lower than the working frequency band to suppress the radiation of the antenna.

Description

Broadband Bow Tie Antenna with Dual Frequency Notch Reflector

technical field

The invention relates to an antenna, in particular to a wide bow-tie antenna with a dual-frequency 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 bowtie 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 bowtie radiation patch is small in size and is used in modern wireless communication systems. very broad. However, its gain is low, so it is not suitable for some occasions with high gain requirements. 

Contents of the invention

Technical problem: the purpose of this invention is to propose a broadband bow-tie antenna with a dual-frequency notch reflector. The wave characteristics make the antenna radiation of two frequency bands lower than the antenna working frequency suppressed, and the antenna structure is simple and the size is small.

Technical solution: The wide bow-tie antenna of the dual-frequency notch reflector of the present invention includes two bow-tie radiation patches, a feeding transmission line, a dielectric substrate and a notch reflector; the bow-tie radiation patch, the feeding transmission line and the notch reflector are all On the dielectric substrate; the shape of the two bow-tie radiation patches is a triangle, and the two bow-tie 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 of the feed transmission line in the feeder The ends of the electrical transmission line are connected; the notch reflector is composed of two microstrip transmission lines with different lengths and open terminals on the left microstrip open line and the right microstrip open line; the conduction band and ground of the microstrip transmission line are printed separately On both sides of the dielectric substrate, the left microstrip open line and the right microstrip 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 bow tie 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 feed transmission line and the end of the feed transmission line. At the first loading point of the notch reflector, the conduction band and ground of the left microstrip open line are respectively connected to the feed The conduction band of the electric transmission line is connected to the ground of the feed transmission line, and at the second loading point of the notch reflector, the conduction band and ground of the microstrip open line on the right are respectively connected to the conduction band of the feed transmission line and the ground of the feed 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 length of the microstrip open line on the left is about 1/4 of the wavelength of the first notch frequency band, and the length of the microstrip open line on the right is about 1/4 of the wavelength of the second notch frequency band, so as to achieve The radiation of the antenna is suppressed in the notch frequency band. the

The lengths of the left microstrip open line and the right microstrip open line of the microstrip transmission line are all longer than the length of the bow tie 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. the

In the two notch frequency bands lower than the operating frequency of the antenna, since the left microstrip open line and the right microstrip open line are terminal open circuits, and the length of the left microstrip open line is about 1/4 of the wavelength of the first notch frequency band 1. The length of the microstrip open line on the right is about a quarter of the wavelength of the second notch frequency band, so the first loading point and the second loading point of the notch reflector on the feeding transmission line, in the two notch frequency bands , the input impedances of the left microstrip open line and the right microstrip open line are respectively zero, so the total input impedances at the first loading point and the second loading point of the notch reflector on the feeding transmission line are respectively zero. Therefore, the broadband bow-tie antenna of the dual-frequency notch reflector is equivalent to a short-circuited transmission line in the two notch frequency bands. Antenna radiation in a frequency band forms a notch characteristic. In the working frequency band of the antenna, the lengths of the left microstrip open line and the right microstrip open line are both greater than a quarter of the working wavelength, which is greater than the length of the antenna bow tie radiation patch, so the notch reflector can realize its reflector characteristics , so that the antenna gain is improved. the

The lengths of the left microstrip open line and the right microstrip open line determine the operating frequency corresponding to the notch characteristics. Therefore, adjusting the lengths of the left microstrip open line and the right microstrip open line can directly adjust the notch reflector respectively. Two notch frequencies. the

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

Corresponding to the working frequency band of the bow tie 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 and the end of the feeding transmission line The distance between the ends of the electrical 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 that the wide bow-tie antenna of the proposed dual-frequency notch reflector can be used as a reflector in the wider working frequency band of the antenna, thereby improving the gain of the antenna and simultaneously trapping The reflector also has a notch function, which can filter out the interference of signals in the two notch frequency bands 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 structural schematic diagram of the present invention. the

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

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 wide bow-tie antenna of the dual-frequency notch reflector includes two bow-tie radiation patches 1, feeder transmission line 2, dielectric substrate 5 and notch reflector 6; bow-tie 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 bow-tie radiation patches 1 is triangular, and the two bow-tie radiation patches 1 are printed on both sides of the dielectric substrate 5 in an antipodal shape, respectively The conduction band 3 of the feeder transmission line and the ground 4 of the feeder transmission line are connected at the end 10 of the feeder transmission line; the notch reflector 6 is composed of two sections of different lengths, open-ended left microstrip open line 11 and right microstrip open line 12 constitutes a microstrip transmission line 7; the conduction band and the ground of the microstrip transmission line 7 are printed on both sides of the dielectric substrate 5, and the left microstrip open line 11 and the right microstrip open line 12 are respectively placed on the two sides of the feeding transmission line 2 side, its stretching direction is parallel to the stretching direction of the bow tie 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 microstrip open line 11 are respectively connected with the conduction band 3 of the feed transmission line 2 and the ground 4 of the feed transmission line. The second loading point 13 of the notch reflector, the conduction band and the ground of the right microstrip 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 length of the microstrip open line 11 on the left is about 1/4 of the wavelength of the first notch frequency band, and the length of the microstrip open line 12 on the right is about 1/4 of the wavelength of the second notch frequency band, so as to achieve The radiation of the antenna is suppressed in the wave frequency band. The lengths of the left microstrip open line 11 and the right microstrip open line 12 of the microstrip transmission line 7 are all longer than the length of the bow tie radiation patch 1, so as to realize the effect of the reflector; and the first loading point 9 of the notch reflector The distance between the end 10 of the feed transmission line and the end 10 of the feeder transmission line is tuned around about a quarter of the maximum operating wavelength, and the distance between the second loading point 13 of the notch reflector and the end 10 of the feeder transmission line is about four Tuning is performed around one-fifth of the minimum operating wavelength to simultaneously achieve better reflector characteristics and matching performance. the

In the two notch frequency bands lower than the operating frequency of the antenna, since the left microstrip open line and the right microstrip open line are terminal open circuits, and the length of the left microstrip open line is about 1/4 of the wavelength of the first notch frequency band 1. The length of the microstrip open line on the right is about 1/4 of the wavelength of the second notch frequency band, so the first loading point 9 and the second loading point 13 of the notch reflector on the feeding transmission line, in the two notch In the wave frequency band, the input impedances of the left microstrip open line and the right microstrip open line are respectively zero, so at the first loading point 9 and the second loading point 13 of the notch reflector on the feeding transmission line, the total input impedance is zero . Therefore, the broadband bow-tie antenna of the dual-frequency notch reflector is equivalent to a short-circuited transmission line in the two notch frequency bands. Antenna radiation in a frequency band forms a notch characteristic. In the working frequency band of the antenna, the lengths of the left microstrip open line and the right microstrip open line are both greater than a quarter of the working wavelength, which is greater than the length of the antenna bow tie radiation patch, so the notch reflector can realize its reflector characteristics , 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 bowtie radiation patch. the

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

Corresponding to the working frequency band of the bow tie 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 and the end of the feeding transmission line The distance between the ends of the electrical 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 bow-tie antenna of the dual-frequency notch reflector remains unchanged in both the double-line transmission line part and the microstrip 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-wire transmission line, which is convenient for feeding the bow-tie 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 two bow-tie radiation patches 1 can be in the shape of a triangular strip, or a triangular strip with zigzag edges or the like. the

In manufacturing, the manufacturing process of the broadband bow-tie antenna of the dual-frequency notch reflector can adopt semiconductor process, ceramic process, laser process or printed circuit process. The broadband bow-tie antenna of the dual-frequency notch reflector is composed of a bow-tie radiation patch 1, a feeding transmission line 2, a dielectric substrate 5 and a notch reflector 6, wherein the bow-tie radiation patch 1 and the conduction band 3 of the feeding transmission line 2 The ground 4 and the conduction band and ground of the microstrip transmission line 7 of the notch reflector 6 are all made of conductive materials 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 bow-tie 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 dual-wire-microstrip feeding transmission line 2 at the end 10 of the feeding transmission line, In order to facilitate feeding through the bifilar-microstrip feeding transmission line. The conduction band and the ground of the left microstrip open line 11 and the right microstrip open line 12 of the microstrip transmission line 7 of the notch reflector 6 are also printed on both sides of the dielectric substrate 5, which are respectively connected to the conduction band 3 and the ground of the feed 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 bow-tie antenna of a dual-frequency notch reflector is characterized in that the broadband bow-tie antenna of this dual-frequency notch reflector comprises two bow-tie radiation patches (1), a feeder transmission line (2), a dielectric substrate ( 5) and a notch reflector (6); the bow-tie radiation patch (1), the feeding transmission line (2) and the notch reflector (6) are all on the dielectric substrate (5); two bow-tie radiation patches (1 ) is triangular in shape, and two bow-tie radiation patches (1) are printed on both sides of the dielectric substrate (5) in an antipodal shape, respectively connected to the conduction band (3) of the feeder transmission line and the ground (4) of the feeder transmission line Connected at the end (10) of the feeder transmission line; the notch reflector (6) is a microstrip composed of two sections of unequal length and open-ended left microstrip open line (11) and right microstrip open line (12) The transmission line (7) is formed; the conduction band and the ground of the microstrip transmission line (7) are printed on both sides of the dielectric substrate (5) respectively, and the left microstrip open line (11) and the right microstrip open line (12) are respectively placed on the feeder Both sides of the electrical transmission line (2), whose stretching direction is parallel to the stretching direction of the bow-tie radiation patch (1); the first loading point (9) of the notch reflector and the second loading point (13) of the notch reflector Both are located between the input end (8) of the feed transmission line (2) and the end (10) of the feed transmission line, at the first loading point (9) of the notch reflector, the conductor of the left microstrip open line (11) The strip 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 microstrip open line (12) The conduction band and ground of the feeder transmission line (2) are connected to the conduction band (3) of the feeder transmission line (2) and the ground (4) of the feeder transmission line respectively. 2. The broadband bow-tie antenna with dual-frequency 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) widest, then gradually narrowed, and becomes the conduction band 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 (3) Same width. 3. The broadband bow-tie antenna of the dual-frequency notch reflector according to claim 1, characterized in that the length of the left microstrip open line (11) is about a quarter of the wavelength of the first notch frequency band, The length of the right microstrip open line (12) is about 1/4 of the wavelength of the second notch frequency band, so as to suppress the radiation of the antenna in the two notch frequency bands. 4. The broadband bow-tie antenna of the dual-frequency notch reflector according to claim 1, characterized in that the left microstrip open line (11) and the right microstrip open line (12) of the microstrip transmission line (7) The length of the bow-tie radiation patch (1) is longer than that of the bow-tie radiation patch (1), so as 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 feeding transmission line is at Tuning is performed around a quarter of the maximum operating wavelength and the spacing between the second loading point (13) of the notch reflector and the end of the feed transmission line (10) is performed around a quarter of the minimum operating wavelength Tuning to simultaneously achieve optimal reflector characteristics and matching performance.