CN107171078B - Circularly polarized microstrip duplex antenna - Google Patents
Circularly polarized microstrip duplex antenna Download PDFInfo
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- CN107171078B CN107171078B CN201710293074.2A CN201710293074A CN107171078B CN 107171078 B CN107171078 B CN 107171078B CN 201710293074 A CN201710293074 A CN 201710293074A CN 107171078 B CN107171078 B CN 107171078B
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- 238000000034 method Methods 0.000 claims description 7
- 230000010287 polarization Effects 0.000 abstract description 12
- 238000013461 design Methods 0.000 abstract description 11
- 238000002955 isolation Methods 0.000 abstract description 7
- 238000004891 communication Methods 0.000 description 8
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- 238000006243 chemical reaction Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
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- 230000007547 defect Effects 0.000 description 3
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
- H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
Abstract
The application discloses a circularly polarized microstrip duplex antenna, which comprises a microstrip patch antenna, two feed probes, a duplex power distribution network, a transmitting port and a receiving port, wherein the microstrip patch antenna is connected with the two feed probes; both the feed probes are connected with the duplex power distribution network; the duplex power distribution network comprises a power distribution microstrip line, a transmitting microstrip band-stop filter, a transmitting impedance transformation microstrip line, a receiving microstrip band-stop filter and a receiving impedance transformation microstrip line; the feed probe comprises a horizontal microstrip and a vertical metal probe, one end of the vertical metal probe is connected with the center of the horizontal microstrip, and the other end of the vertical metal probe is connected with the power distribution microstrip line. The application designs a microstrip circularly polarized duplex antenna with duplex function, and the polarization modes of electromagnetic waves used for transmitting and receiving of the antenna are the same and are all left-hand circularly polarized electromagnetic waves; meanwhile, by arranging the transmitting and receiving microstrip band-stop filters, high isolation between the transmitting port and the receiving port is realized.
Description
Technical Field
The application relates to the technical field of wireless communication, in particular to a circularly polarized microstrip duplex antenna.
Background
The antenna feeder system is the forefront of the wireless communication system and is an indispensable key component of the wireless communication system. The antenna feed system mainly comprises an antenna, a filter and a duplexer, and the traditional method is to design the antenna, the filter and the duplexer separately and then connect the antenna, the filter and the duplexer. The three have the defects that the independent matching network is needed to be matched with a 50 ohm feeder line, the problems of large volume and total weight are easy to be caused, and meanwhile, the defect of high loss is caused by excessive matching networks.
With the development of wireless communication, communication systems tend to be miniaturized and integrated, and thus, integrated antenna feed systems have great demands. The duplex antenna jointly designs front-end devices such as an antenna, a filter, a duplexer and the like, so that the structure of the radio frequency front-end system is more compact, unnecessary loss introduction is reduced, and miniaturization and integration of the communication system are easier to realize.
In the existing duplex antenna, the duplex antenna is realized by mainly utilizing a design method of a multi-frequency antenna combined duplexer, or the filtering duplex antenna is realized by a design method of a multi-mode antenna combined filter. The currently proposed duplex antenna is mainly a linear polarization duplex antenna, the interval between the transmitting frequency and the receiving frequency of the antenna is larger, the port isolation is generally between 20 dB and 30dB, and the gain of the antenna is below 5 dBi.
Compared with a linear polarization antenna, the circular polarization antenna can receive electromagnetic waves in any direction, so that the multipath fading effect in wireless communication can be effectively resisted, and the problem of polarization mismatch caused by the linear polarization antenna can be solved. Therefore, the circularly polarized antenna is widely applied to wireless communication systems such as RFID, GPS, beidou satellite systems and the like.
Therefore, the existing homopolar duplex antenna generally has the defects of low port isolation, large antenna receiving and transmitting frequency interval and low antenna gain. Moreover, the existing homopolar duplex antenna is basically a linear polarization duplex antenna, and the existing homopolar duplex antenna is relatively less than a circular polarization duplex antenna.
Disclosure of Invention
The application aims to solve the technical problem of providing a circularly polarized microstrip duplex antenna, which has the advantages that compared with the existing homopolar duplex antenna, the antenna has closer transmission and receiving frequency interval, the isolation of the port for transmitting and receiving the antenna is high, and the electromagnetic waves transmitted by the transmitting port and the electromagnetic waves received by the receiving port of the antenna are circularly polarized waves.
In order to solve the technical problems, the application provides the following technical scheme: a circularly polarized microstrip duplex antenna comprises a microstrip patch antenna, two feed probes, a duplex power distribution network with duplex function, a transmitting port and a receiving port; wherein the method comprises the steps of
Both the feed probes are connected with the duplex power distribution network;
the duplex power distribution network comprises a power distribution microstrip line, a transmitting microstrip band-stop filter, a transmitting impedance transformation microstrip line, a receiving microstrip band-stop filter and a receiving impedance transformation microstrip line; one end of the transmitting microstrip band-stop filter is connected with the transmitting port, and the other end of the transmitting microstrip band-stop filter is connected with the power distribution microstrip line through the transmitting impedance transformation microstrip line; one end of the receiving microstrip band-stop filter is connected with a receiving port, and the other end of the receiving microstrip band-stop filter is connected with the power distribution microstrip line through the receiving impedance transformation microstrip line;
the feed probe comprises a horizontal microstrip and a vertical metal probe, one end of the vertical metal probe is connected with the center of the horizontal microstrip, and the other end of the vertical metal probe is connected with the power distribution microstrip line.
Further, the feed probe is a T-type feed probe, that is, the horizontal microstrip and the vertical metal probe are connected vertically.
Further, the transmitting microstrip band reject filter is connected with the power distribution microstrip line through the transmitting impedance transformation microstrip line; wherein the connection position of the transmission impedance transformation microstrip line and the power distribution microstrip line divides the power distribution microstrip line into two sections of lines, and the difference of the lengths between the two sections of lines is lambda g hair 4; the receiving microstrip band-stop filter is connected with the power distribution microstrip line through the receiving impedance transformation microstrip line; wherein the connection position of the receiving impedance transformation microstrip line and the power distribution microstrip line also divides the power distribution line into two sections of lines, and the difference of the lengths of the two sections of lines is lambda g receive 4; wherein lambda is g hair Lambda for transmitting the wavelength of the signal on said power distribution microstrip line g receive The wavelength of the signal on the microstrip line is allocated for reception.
Further, the transmitting microstrip band reject filter includes two sections of first end open-circuit microstrip lines and one section of first connecting microstrip line, two ends of the connecting microstrip line are respectively connected with two sections of the first end open-circuit microstrip lines, and the length and width of the first end open-circuit microstrip lines enable the frequency to be f Hair brush Can pass through the transmission signal of (a) and has a frequency f Collecting and recovering The first connecting microstrip line having a length and width such that the frequency is f Hair brush Can pass through the transmission signal of (a) and has a frequency f Collecting and recovering Is not passed through.
Further, the receiving microstrip band stop filter is composed of two sections of second-end open-circuit microstrip lines and one section of second-connection microstrip line, two ends of the second-connection microstrip line are respectively connected with two sections of the second-end open-circuit microstrip lines, and the length and the width of the second-end open-circuit microstrip lines enable the frequency to be f Collecting and recovering Can pass through the received signal of (2) and has a frequency f Hair brush The second connection microstrip line having a length and width such that the frequency is f Collecting and recovering Can pass through the received signal of (2) and has a frequency f Hair brush Is not passed through.
Further, the working pass bands of the sending microstrip band-stop filter and the receiving microstrip band-stop filter are opposite, and the stop band frequencies of the sending microstrip band-stop filter and the receiving microstrip band-stop filter are opposite.
Further, the length and width of the transmission impedance transformation microstrip line satisfy the following requirements: satisfy the frequency f Collecting and recovering Under the condition of receiving signals, when the transmitting port is connected with a matching load, the impedance of the connecting end of the transmitting impedance transformation microstrip line and the power distribution microstrip line is close to an open circuit.
Further, the length and width of the receiving impedance transformation microstrip line meet the following requirements: satisfy the frequency f Hair brush Under the condition of transmitting signals, when the receiving port is connected with a matching load, the impedance of the connecting end of the receiving impedance transformation microstrip line and the power distribution microstrip line is close to an open circuit.
Further, the transmitting impedance transformation microstrip line and the receiving impedance transformation microstrip line work at different frequencies; the transmission impedance transformation microstrip line is a 35.4 omega impedance transformation line with a length lambda g receive 4; the receiving impedance transformation microstrip line is also a 35.4 omega impedance transformation line with the length lambda g hair 4; wherein lambda is g hair Lambda for transmitting the wavelength of the signal on said power distribution microstrip line g receive The wavelength of the signal on the microstrip line is allocated for reception.
Further, the circularly polarized microstrip duplex antenna also comprises two upper medium substrates and a lower medium substrate which are arranged in parallel, wherein the upper surface of the lower medium substrate is covered with a metal reflecting floor, and the bottom surface is provided with a duplex power distribution network; the microstrip patch antenna is printed on the upper surface of the upper medium substrate; the horizontal microstrip of the probe is printed on the lower surface of the upper medium substrate.
After the technical scheme is adopted, the application has at least the following beneficial effects:
1. the application combines the power distribution network of the circularly polarized antenna with the design of the duplex network, and designs a duplex power distribution network with duplex function and power distribution function; the power distribution of the transmitting port and the receiving port of the antenna and the phase shift of the signals are realized through a section of common power distribution microstrip line which is close to one quarter wavelength of a low-frequency working frequency band, so that the structure of the antenna is compact; meanwhile, a transmitting microstrip band-stop filter is arranged at the transmitting port, and a receiving microstrip band-stop filter is arranged at the receiving port, so that high isolation between the transmitting port and the receiving port is realized;
2. the signals transmitted and received by the application are coupled with the patch antenna through the micro-strip on the T-shaped probe, and the phases of the signals of the two ports on the horizontal micro-strip of the two T-shaped probes are the probe phase of which the micro-strip is in the x direction and the probe phase of which the micro-strip is in the y direction after the phase of the micro-strip is shifted by the power distribution micro-strip line, so that the same polarization of transmitting and receiving is realized, and the signals are circularly polarized;
3. the application has small mutual interference of transmission and reception, and the transmitting branch does not influence the receiving signal on the power distribution microstrip line by inserting the transmission impedance transformation microstrip line between the transmission microstrip band-stop filter and the power distribution microstrip line; by inserting the receiving impedance transformation microstrip line between the receiving microstrip band-stop filter and the power distribution microstrip line, the receiving branch does not affect the transmission signal on the power distribution microstrip line when the transmission port works. Therefore, mutual interference between transmission and reception is small;
4. the existing homopolar duplex antenna is usually designed based on a design method of a band-pass filter, the passband of the band-pass filter focuses on the design in the passband, the effect of inhibiting the passage of signals is not very good in the out-of-band relatively close to the passband, and the order of the band-pass filter is usually required to be increased to improve the out-of-band inhibition of the band-pass filter, so that the design of the filter is more complex and the size is increased; the application designs the same-polarization circular polarization duplex antenna by adopting a band-stop filter method, and the band on one side closer to the passband can generate a transmission zero point, and the effect of inhibiting the signal from passing is better, so that a smaller transmission and reception frequency interval can be realized, and the better transmission and reception isolation characteristic is maintained.
Drawings
Fig. 1 is a schematic diagram of the overall structure of a circularly polarized microstrip duplex antenna of the present application, and the numbers of the main components are labeled;
fig. 2 is a schematic diagram of the overall structure of the circularly polarized microstrip duplex antenna of the present application, and the detailed numbering is given;
fig. 3 is a front cross-sectional view of a circularly polarized microstrip duplex antenna of the application;
fig. 4 is a top view of an upper dielectric substrate of the circularly polarized microstrip duplex antenna of the present application;
fig. 5 is a bottom view of an upper dielectric substrate of the circularly polarized microstrip duplex antenna of the present application;
FIG. 6 is a top view of a lower dielectric substrate of the circularly polarized microstrip duplex antenna of the present application;
fig. 7 is a bottom view of a lower dielectric substrate of the circularly polarized microstrip duplex antenna of the present application;
FIG. 8 is a dimension drawing of the upper surface structure of the upper dielectric substrate of the circularly polarized microstrip duplex antenna of the present application;
FIG. 9 is a dimension marking diagram of the lower surface structure of the upper dielectric substrate of the circularly polarized microstrip duplex antenna of the application;
FIG. 10 is a dimension drawing of the upper surface structure of the lower dielectric substrate of the circularly polarized microstrip duplex antenna of the present application;
FIG. 11 is a dimension drawing of a power distribution line on a lower dielectric substrate of a circularly polarized microstrip duplex antenna of the present application;
FIG. 12 is a graph of simulated S-parameters of an example transmit band reject filter of the present embodiment;
FIG. 13 is a graph of simulated S-parameters of an example of a receive band reject filter of the present embodiment;
fig. 14 is an impedance diagram of the transmission conversion microstrip line of the present embodiment after connecting the simulation S parameter of the transmission microstrip band stop filter and the transmission port to the matching load;
fig. 15 is an impedance diagram of the receiving conversion microstrip line of the present embodiment after connecting the simulation S parameter of the receiving microstrip band stop filter and the receiving port to the matching load;
fig. 16 is a graph of a test S-parameter of the circularly polarized microstrip duplex antenna according to the present embodiment;
FIG. 17 (a) is a xoz face simulation pattern of the receive port (2.2 GHz) excitation of the present embodiment;
FIG. 17 (b) is a yoz face simulation pattern of the receive port (2.2 GHz) excitation of the present embodiment;
FIG. 18 (a) is a xoz face simulation pattern of the transmit port (2.4 GHz) excitation of the present embodiment;
FIG. 18 (b) is a yoz face simulation pattern of the transmit port (2.4 GHz) excitation of the present embodiment;
FIG. 19 is a graph showing the simulated gain of the antenna according to the present embodiment as a function of frequency;
fig. 20 is a graph showing the variation of the simulated axial ratio of the antenna according to the present embodiment with frequency.
Detailed Description
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other, and the present application will be further described in detail with reference to the drawings and the specific embodiments.
Referring to fig. 1, 2 and 3, the present application provides a circularly polarized microstrip duplex antenna with same polarization, comprising a square microstrip patch antenna 1, two T-type probes 2 for feeding, a power distribution network 3 with duplex function, a transmitting port 31 and a receiving port 32, wherein the duplex power distribution network 3 comprises a power distribution microstrip line 4, a transmitting microstrip band-stop filter 7, a transmitting impedance transformation microstrip line 5,
A reception microstrip band reject filter 8 and a reception impedance transformation microstrip line 6.
One end of the transmission microstrip band reject filter 7 is connected with the transmission port 31, and the other end is separated from the power distribution microstrip line 4 by a transmission impedance transformation microstrip line 5 by a distance lambda g hair Connected at positions/4, lambda g hair The wavelength of the transmit signal on the power distribution microstrip line 4.
One end of the receiving microstrip band stop filter 8 is connected with the receiving port 32, and the difference between the lengths of the other end of the receiving microstrip band stop filter and the power distribution microstrip line 4 at the distance from the two ends of the power distribution microstrip line through the receiving impedance transformation microstrip line 6 is lambda g receive Connected at positions/4, lambda g receive The wavelength of the signal on the microstrip line 4 is allocated for reception.
The transmitting impedance transformation microstrip line 5 and the receiving impedance transformation microstrip line 6 are a left section and a right section which work at different frequencies and have the length lambda g receive /4 and lambda g hair 35.4 omega impedance transformation line of/4. The microstrip impedance transformation lines 5, 6 are followed by two sections of low impedance transmission lines 20, 23, respectively, which are then connected to two ports of the radio frequency system by two sections of 50 omega transmission lines 24, 25. The four sections of loaded L-shaped terminal open-circuit branch node lines 18, 19, 21 and 22 are respectively loaded at two ends of two sections of low-impedance lines 20 and 23, and form two band-stop filters of a transmitting and receiving port with the two sections of low-impedance lines. The operating passband of the two band reject filters is diametrically opposite to the reject frequency.
The transmitting microstrip band stop filter 7 consists of two sections of microstrip lines 18 and 19 with open ends and a section of connecting microstrip line 20, and two ends of the connecting microstrip line 20 are respectively connected with the two open-circuit microstrip lines 18 and 19. The lengths and widths of the open-ended microstrip lines 18, 19 and the connecting microstrip line 20 are selected so that the frequency is f Hair brush Can pass through the transmission signal of (a) and has a frequency f Collecting and recovering Is not passed through. As an example, when requirement f Hair brush ＝2.4GHz，f Collecting and recovering When the dielectric plate with the relative dielectric constant of 2.55 and the thickness of h=0.8 mm can be adopted as the substrate when the dielectric plate is in the range of=2.2 GHz, the length of the open microstrip line 18 is 26.5mm, the width of the open microstrip line is 0.5mm, the length of the open microstrip line 19 is 26.04mm, the width of the open microstrip line is 0.5mm, the length of the connection microstrip line 20 is 25.7mm, the width of the connection microstrip line is 9mm, and fig. 12 is a transmitting microstrip at this timeThe S parameter of the band-stop filter can be seen that the S12 of the band-stop filter is-1.95 dB at the frequency of 2.4GHz and the S12 of the band-stop filter is-40.8 dB at the frequency of 2.2GHz, so that the function of blocking a received signal by transmitting the signal is realized.
The receiving microstrip band stop filter 8 is composed of two sections of microstrip lines 21 and 22 with open ends and a section of connecting microstrip line 23, and two ends of the connecting microstrip line 23 are respectively connected with the two open-circuit microstrip lines 21 and 22. The lengths and widths of the end open microstrip lines 21, 22 and the connecting microstrip line 23 are selected so that the frequency is f Collecting and recovering Can pass through the received signal of (2) and has a frequency f Hair brush Is not passed through. As an example, when requirement f Hair brush ＝2.4GHz，f Collecting and recovering When the dielectric plate with the relative dielectric constant of 2.55 and the thickness of h=0.8 mm can be adopted as the substrate when the dielectric plate is in the range of=2.2 GHz, the length of the open microstrip line 21 is 26.8mm, the width of the open microstrip line is 0.5mm, the length of the open microstrip line 22 is 26.19mm, the width of the open microstrip line is 0.5mm, the length of the connecting microstrip line 23 is 25.5mm, and the width of the connecting microstrip line is 14mm, and the S parameter of the receiving microstrip band stop filter in the moment is shown in fig. 13, wherein the S12 of the receiving microstrip band stop filter is-1.65 dB when the frequency is 2.2GHz, and the S12 of the receiving microstrip line is-41.5 dB when the frequency is 2.4GHz, so that the function of blocking a transmitting signal by receiving the signal is realized.
The transmission impedance transformation microstrip line 5 is ensured to have a frequency f by properly selecting the length and width thereof Collecting and recovering The impedance of the connection end of the microstrip line 4 (when the transmission port 31 is connected with a matching load) is large (close to an open circuit), so that the frequency f is not affected Collecting and recovering The transmission of the received signal on the power distribution microstrip line 4. As an example, when requirement f Hair brush ＝2.4GHz，f Collecting and recovering When the impedance is=2.2 GHz, a dielectric plate with a relative dielectric constant of 2.55 and a thickness of h=0.8 mm may be used as the substrate, the length of the transmission impedance transformation microstrip line 5 is 23.5mm, the width is 3.67mm, and the S parameter and the impedance of the transmission port 31 after the matching load are as shown in fig. 14. It can be seen that at f Collecting and recovering At =2.2 GHz, the impedance is greater than 1000 ohms, but for a frequency f Hair brush The transmission signal of =2.4 GHz is attenuated little.
The receiving impedance transformation microstrip line 6 is ensured to have a frequency f by properly selecting the length and width thereof Hair brush The impedance of the connection end of the microstrip line 4 (when the receiving port 32 is connected with a matching load) is large (close to an open circuit), so that the frequency f is not affected Hair brush Transmission of the transmission signal on the power distribution microstrip line 4. As an example, f Hair brush ＝2.4GHz，f Collecting and recovering When the impedance conversion microstrip line is =2.2 GHz, a dielectric plate with a relative dielectric constant of 2.55 and a thickness of h=0.8 mm may be used as the substrate, and the length of the impedance conversion microstrip line 6 is 19.5mm and the width thereof is 3.67mm, and the S parameter and the impedance of the receiving port 32 after the matching load are as shown in fig. 15. It can be seen that at f Collecting and recovering At=2.4 GHz, the impedance is greater than 1000 ohms, but for a frequency f Hair brush The received signal of =2.2 GHz is attenuated little.
The circularly polarized microstrip duplex antenna further comprises an upper medium substrate 9 and a lower medium substrate 11 which are arranged in parallel, the upper surface of the lower medium substrate 11 is covered with a metal reflecting floor 10, and the bottom surface is provided with an inverted power distribution network 3 of the antenna.
The microstrip patch antenna 1 comprises a square metal patch 1 printed on the upper surface of an upper dielectric substrate 9.
The T-shaped probe consists of metal micro-strips 12 and 13 printed on the lower surface of the upper medium substrate 9 and metal probes 14 and 15 connected to the centers of the metal micro-strips 12 and 13, and the other ends of the metal probes 14 and 15 respectively penetrate through holes 16 and 17 on the reflecting floor 10 and the lower medium substrate 11 to be connected with two ends of the power distribution micro-strip line 4.
When transmitting, a transmission signal is sent from the transmission port 31, and sent to the power distribution microstrip line through the transmission microstrip band reject filter 7 and the transmission impedance conversion microstrip line 5. The signals passing through the power splitting microstrip line are split at the two T-shaped probes 12, 13, 14, 15 with the same amplitude and 90 degrees phase difference and coupled to the radiating patch 1 through the microstrips 12, 13 on the T-shaped probes. Since the two microstrips 12, 13 are placed vertically, two electromagnetic waves orthogonal to each other in space can be excited on the radiation patch. The signals reaching the two micro-strips 12 and 13 through the feed network have equal amplitude and 90-degree phase difference, so that a circularly polarized electromagnetic wave can be excited on the radiation patch.
When received, the received signal is received from the radiating patch antenna 1 and coupled to the T-probes 12, 13, 14, 15. The received signal is fed to both ends of the power distribution microstrip line 4 via the T-probes 12, 13, 14, 15. At this time, the signals at both ends of the power distribution microstrip line 4 are also equal in amplitude and are 90 degrees out of phase. The signals at both ends of the power distribution microstrip line 4 are superimposed in exactly the same phase when reaching the reception impedance transformation microstrip line 6 through the power distribution microstrip line having a phase difference of 90 degrees, and then output from the reception port 32 through the reception impedance transformation microstrip line 6 and the reception microstrip band stop filter 8.
Fig. 4, 5, 6 and 7 are electrical structures of upper and lower surfaces of two dielectric substrates, respectively, the stripe filling portion is a structure covered with conductive copper, and the rest is the dielectric substrate.
Fig. 8, 9, 10, and 11 are dimension drawings of the electrical structure of each part.
With reference to fig. 2, 8, 9, 10 and 11, specific parameters of the antenna in this embodiment are as follows: the two dielectric plates are the same in material and size, and have a thickness c of 0.8mm, a width b of 120mm and a length a of 120mm. The height h between the two dielectric plates is 8mm. The side length 1a of the square patch and the distance from the edge of the dielectric plate are 47.5mm and 36.25mm respectively. Two elongate microstrips for coupling are 2a, 2b long and 2b wide, and are 2mm, 6.5mm and 49mm apart from the edge of the dielectric plate 2c, respectively. The main dimensions 4a, 4b, 4c, 4d of the power distribution network are 27.85mm, 2.3mm, 4.75mm, 2.18mm, respectively. The lengths 5a and 6a of the two 35.4Ω impedance transformation lines are 23.5mm and 19.5mm, respectively, and the widths 5b and 6b are 3.67mm. The width 18b of the four-section open-ended L-branch node line is 0.5mm, and the lengths 18a, 19a, 21a and 22a are 26.5mm, 26.04mm, 26.8mm and 26.19mm respectively. The lengths 20a, 23a and widths 20b, 23b of the two sections of low impedance transmission are 25.7mm, 25.5mm, 9mm, 14mm, respectively. The lengths 24a, 25a of the two transmission lines connected to the ports were 9.65mm, 13.85mm respectively, and the widths were 2.25mm respectively. The transmit port 31 of the antenna operates in the 2.4GHz band. The receive port 32 operates in the 2.2GHz band. In both bands, the isolation of both ports is greater than 43dB, as shown in fig. 16. The gain of the antenna is substantially greater than 6dBi and the cross polarization is greater than 15dB for both operating frequency bands, as shown in the simulated test patterns 17, 18 of the antenna. When the receiving port 32 of the antenna is operated, the gain of the antenna at the operating frequency of 2.2GHz of the transmitting port 31 is 6.1dBi, and the gain at the operating frequency of 2.4GHz of the transmitting port 31 is rapidly reduced to below-30 dBi, and the gain difference is more than 35dB, as shown in fig. 19. Similarly, when the transmitting port 31 of the antenna is operated, the gain of the antenna at the operating frequency of 2.4GHz of the transmitting port 31 is 6.9dBi, and the gain at the operating frequency of 2.2GHz of the receiving port 32 is also rapidly reduced below-30 dBi, and the gain difference is also more than 35dB, as shown in fig. 19, where the port 1 represents the transmitting port 31 and the port 2 represents the receiving port 32. When the transmitting port 31 of the antenna works, the axial ratio of the antenna is smaller than 1.8dB in the working frequency range of the transmitting port 31; when the transmitting port 31 of the antenna is operated, the axial ratio of the antenna is less than 2.2dB in the operating frequency range of the transmitting port 31, as shown in fig. 20, port 1 represents the transmitting port 31 and port 2 represents the receiving port 32, and both ports of the antenna show good circular polarization characteristics.
Although embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various equivalent changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the application, the scope of which is defined in the appended claims and their equivalents.
Claims (1)
1. The circularly polarized microstrip duplex antenna is characterized by comprising a microstrip patch antenna, two feed probes, a duplex power distribution network with a duplex function, a transmitting port and a receiving port; wherein the method comprises the steps of
Both feed probes are connected with a duplex power distribution network;
the duplex power distribution network comprises a power distribution microstrip line, a transmitting microstrip band-stop filter, a transmitting impedance transformation microstrip line, a receiving microstrip band-stop filter and a receiving impedance transformation microstrip line; one end of the transmitting microstrip band-stop filter is connected with the transmitting port, and the other end of the transmitting microstrip band-stop filter is connected with the power distribution microstrip line through the transmitting impedance transformation microstrip line; one end of the receiving microstrip band-stop filter is connected with the receiving port, and the other end of the receiving microstrip band-stop filter is connected with the power distribution microstrip line through the receiving impedance transformation microstrip line;
the feed probe comprises a horizontal microstrip and a vertical metal probe, one end of the vertical metal probe is connected with the center of the horizontal microstrip, and the other end of the vertical metal probe is connected with the power distribution microstrip line;
the transmitting microstrip band-stop filter is connected with the power distribution microstrip line through a transmitting impedance transformation microstrip line; wherein the connection position of the transmission impedance transformation microstrip line and the power distribution microstrip line divides the power distribution microstrip line into two sections of lines, and the difference of the lengths between the two sections of lines is Hair brush 4; the receiving microstrip band-stop filter is connected with the power distribution microstrip line through the receiving impedance transformation microstrip line; wherein the connection position of the receiving impedance transformation microstrip line and the power distribution microstrip line also divides the power distribution line into two sections of lines, and the difference of the lengths of the two sections of lines is-> Collecting and recovering 4; wherein (1)> Hair brush Wavelength of the transmission signal on the power distribution microstrip line, < >> Collecting and recovering Distributing the wavelength of the received signal on the microstrip line for power;
the transmitting microstrip band stop filter comprises two sections of first-end open-circuit microstrip lines and one section of first-connection microstrip line, wherein two ends of the first-connection microstrip line are respectively connected with two sections of first endsAn open-ended microstrip line, the length and width of the open-ended microstrip line at the first end being such that the frequency is f Hair brush Can pass through the transmission signal of (a) and has a frequency f Collecting and recovering The reception signal of (a) cannot pass through, the length and width of the first connection microstrip line are such that the frequency is f Hair brush Can pass through the transmission signal of (a) and has a frequency f Collecting and recovering Is not passed through by the reception signal of (a);
the receiving microstrip band-stop filter consists of two sections of second end open-circuit microstrip lines and one section of second connecting microstrip line, wherein the two ends of the second connecting microstrip line are respectively connected with the two sections of second end open-circuit microstrip lines, and the length and the width of the second end open-circuit microstrip lines enable the frequency to be f Collecting and recovering Can pass through the received signal of (2) and has a frequency f Hair brush The transmission signal of (2) cannot pass through, the length and width of the second connection microstrip line is such that the frequency is f Collecting and recovering Can pass through the received signal of (2) and has a frequency f Hair brush Cannot pass through the transmission signal of (a);
the working passband of the transmitting microstrip band-stop filter and the receiving microstrip band-stop filter is opposite to the stopband frequency;
the length and width of the transmission impedance transformation microstrip line satisfy the following requirements: satisfy the frequency f Collecting and recovering Under the condition of receiving signals, when the transmitting port is connected with a matching load, the impedance of the connecting end of the transmitting impedance transformation microstrip line and the power distribution microstrip line is close to an open circuit;
the length and width of the receiving impedance transformation microstrip line meet the following requirements: satisfy the frequency f Hair brush Under the condition of transmitting signals, when a receiving port is connected with a matching load, the impedance of the connecting end of the receiving impedance transformation microstrip line and the power distribution microstrip line is close to an open circuit;
the device also comprises two upper medium substrates and a lower medium substrate which are arranged in parallel, wherein the upper surface of the lower medium substrate is covered with a metal reflecting floor, and the bottom surface is provided with a duplex power distribution network; the microstrip patch antenna is printed on the upper surface of the upper medium substrate; the horizontal microstrip of the probe is printed on the lower surface of the upper medium substrate;
the microstrip patch antenna is a square metal patch printed on the upper surface of the upper dielectric substrate;
the feed probe is a T-shaped feed probe, and the horizontal microstrip and the vertical metal probe are mutually and vertically connected;
the two T-shaped feed probes consist of two horizontal micro-strips printed on the lower surface of the upper medium substrate and two vertical metal probes connected to the centers of the horizontal micro-strips, and the other ends of the two vertical metal probes respectively penetrate through the reflecting floor and through holes on the lower medium substrate to be connected with two ends of the power distribution micro-strip line;
the transmitting signal is sent from the transmitting port, and is sent to the power distribution microstrip line through the transmitting microstrip band-stop filter and the transmitting impedance transformation microstrip line; the signals passing through the power distribution microstrip line are distributed to two horizontal microstrips and two vertical metal probes of the two T-shaped feed probes in the same amplitude and phase difference of 90 degrees, and are coupled to the microstrip patch antenna through the horizontal microstrips on the T-shaped feed probes; two horizontal micro-strips are vertically arranged, and two electromagnetic waves with mutually orthogonal spaces are excited on a micro-strip patch antenna; the signal amplitude reaching two horizontal micro-strips through the feed network is equal, the phase difference is 90 degrees, and a circularly polarized electromagnetic wave is excited on the micro-strip patch antenna;
the receiving signal is received from the microstrip patch antenna and is coupled to two horizontal microstrips and two vertical metal probes of the two T-shaped feed probes; the receiving signals are sent to two ends of the power distribution microstrip line after passing through two horizontal microstrips and two vertical metal probes of the two T-shaped feed probes; the signal amplitudes at two ends of the power distribution microstrip line are equal and the phase difference is 90 degrees; signals at two ends of the power distribution microstrip line are overlapped with the same phase when reaching the receiving impedance transformation microstrip line through the power distribution microstrip line with the phase difference of 90 degrees, and then are output from the receiving port through the receiving impedance transformation microstrip line and the receiving microstrip band-stop filter.
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| CN107732433B (en) * | 2017-10-26 | 2023-09-26 | 华南理工大学 | Duplex I-shaped groove antenna |
| CN107809008B (en) * | 2017-11-23 | 2024-03-15 | 东莞理工学院 | In-band full duplex antenna based on 180-degree hybrid loop |
| EP3734757B1 (en) * | 2019-05-02 | 2023-05-17 | Nokia Solutions and Networks Oy | A multi-band antenna arrangement |
| CN110233342B (en) * | 2019-06-24 | 2021-02-05 | 西安空间无线电技术研究所 | Complex impedance matching circular polarization filtering antenna |
| CN114709576A (en) * | 2022-04-21 | 2022-07-05 | 交通运输部公路科学研究所 | Microstrip duplexer applied to Beidou short message communication and design method |
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