CN107809008B - In-band full duplex antenna based on 180-degree hybrid loop - Google Patents
In-band full duplex antenna based on 180-degree hybrid loop Download PDFInfo
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- CN107809008B CN107809008B CN201711185070.9A CN201711185070A CN107809008B CN 107809008 B CN107809008 B CN 107809008B CN 201711185070 A CN201711185070 A CN 201711185070A CN 107809008 B CN107809008 B CN 107809008B
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- 239000000523 sample Substances 0.000 claims abstract description 44
- 230000005855 radiation Effects 0.000 claims abstract description 17
- 238000002955 isolation Methods 0.000 claims abstract description 12
- 230000008878 coupling Effects 0.000 claims abstract description 6
- 238000010168 coupling process Methods 0.000 claims abstract description 6
- 238000005859 coupling reaction Methods 0.000 claims abstract description 6
- 239000000758 substrate Substances 0.000 claims description 29
- 239000002184 metal Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 230000009466 transformation Effects 0.000 claims description 6
- 230000010287 polarization Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract 1
- 238000004891 communication Methods 0.000 description 8
- 238000005388 cross polarization Methods 0.000 description 6
- 230000005284 excitation Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000010295 mobile communication Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
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- 238000004088 simulation Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems
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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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Abstract
The invention discloses an in-band full duplex antenna based on a 180-degree hybrid loop, which comprises a square microstrip radiation patch, two T-shaped probes for coupling feeding and a 180-degree hybrid loop feeding network. The invention designs an antenna with an in-band full duplex function, and the transmitting and receiving processes of the antenna are performed simultaneously and occupy the same working frequency band. Two isolation ports of the 180-degree hybrid ring are used as a transmitting end and a receiving end of the antenna, the other two ports are led out by two 50 omega microstrip lines, and the radiation Fang Tiepian is respectively fed in a coupling way through two T-shaped probes. The antenna transmits and receives electromagnetic waves with orthogonal linear polarization, provides polarization isolation, and meanwhile, the isolation of the two ports provided by the 180-degree hybrid ring further realizes high isolation between the transmitting port and the receiving port.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to an in-band full duplex antenna based on a 180-degree hybrid ring.
Background
The antenna is a conversion device for radiating and receiving electromagnetic waves, can be used as a transmitting device for converting high-frequency current into radio waves with the same frequency to be transmitted, and can also be used as a receiving device for receiving and converting the radio waves into the high-frequency current with the same frequency, and has wide application in the aspects of mobile communication, broadcasting, radio, remote sensing and the like. For mobile communication systems, antennas, which are more converters of device circuit signals and electromagnetic wave signals, are the access ports for information, and their performance affects the performance of the entire mobile network.
With the development of wireless communication, the rate requirements of wireless communication are also higher, and the capacity requirements of wireless communication are also higher. The single antenna can realize simultaneous transmitting and receiving operation and occupy the same working frequency band, so that the number and occupied space of the antennas can be effectively reduced, and the antenna has very wide application space and practical value.
The main form of implementing in-band duplexing is to use a dual polarized antenna. The dual polarized antenna can improve the signal-to-noise ratio of the wireless communication receiving signal through space diversity because the two ports respectively transmit or receive electromagnetic waves in two mutually perpendicular polarization directions and do not affect each other, thereby improving the capacity of wireless communication. Because the two ports of the dual-polarized antenna can work at the same working frequency and can distinguish electromagnetic waves with two mutually perpendicular polarization directions, compared with the traditional frequency division duplex antenna, the dual-polarized antenna can use the same working frequency for transmitting and receiving, and therefore the communication capacity of a communication system can be increased by times.
The prior in-band duplex antenna has the defects of low isolation of ports, poor cross polarization and low gain of the antenna in the structure form of respectively feeding the two ports by probes to generate orthogonal linear polarization waves.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides an in-band full duplex antenna based on a 180-degree hybrid ring.
The aim of the invention can be achieved by adopting the following technical scheme:
an in-band full duplex antenna based on a 180-degree hybrid ring comprises an upper dielectric substrate, a lower dielectric substrate and two T-shaped probes for coupling feeding, wherein the two T-shaped probes are respectively formed by vertically connecting a first horizontal arm 2 and a first vertical arm 4 and a second horizontal arm 3 and a second vertical arm 5,
the upper surface of the upper medium substrate is printed with a square microstrip radiation patch 1, the lower surface of the lower medium substrate is printed with a first horizontal arm 2 and a second horizontal arm 3,
the upper surface of the lower medium substrate is printed with a reflective floor 11, the lower surface of the lower medium substrate is printed with a 180-degree hybrid loop feed network, the 180-degree hybrid loop feed network comprises a first microstrip line 14, a second microstrip line 15, a third microstrip line 16 and a fourth microstrip line 17 with a three-quarter wavelength, the 180-degree hybrid loop feed network comprises four ports, wherein two ports are led out by a first impedance transformation line 8, a second impedance transformation line 9 and a fifth microstrip line 10 with different impedances as isolation ports and are respectively used as a transmitting end and a receiving end; the other two ports are respectively led out through a sixth microstrip line 6 and a seventh microstrip line 7 and are connected with a first vertical arm 4 and a second vertical arm 5 of the two T-shaped probes.
Further, the sixth microstrip line 6 and the seventh microstrip line 7 are connected to the first vertical arm 4 and the second vertical arm 5 of the two T-shaped probes penetrating the reflective floor 11 and the first through hole 18 and the second through hole 19 on the lower dielectric substrate 13, respectively.
Further, the first horizontal arm 2 and the second horizontal arm 3 are rectangular micro-strips, and are symmetrically arranged along the diagonal line of the square micro-strip radiation patch, and are mutually perpendicular.
Further, the first vertical arm 4 and the second vertical arm 5 are metal probes, and are located at two symmetrical positions of the geometric center of the square microstrip radiation patch, one ends of the two metal probes are respectively connected with the sixth microstrip line and the seventh microstrip line, and the other ends of the two metal probes respectively pass through the through holes on the reflective floor and the lower medium substrate to be connected with two horizontal arms of the two T-shaped probes.
Further, the signals respectively reach the two T-shaped probes through the ports of the transmitting ends, the signal amplitudes of the two T-shaped probes are equal and the phase difference is 180 degrees, then the signals are coupled to the square microstrip radiation patch through the first horizontal arm 2 and the second horizontal arm 3 of the two horizontal directions of the two T-shaped probes to radiate, and linear polarized waves in the y direction are generated at the far field of the antenna.
Further, the signals respectively reach the two T-shaped probes through the ports of the receiving end, the amplitude and the phase of the signals reaching the two T-shaped probes are equal, then the signals are coupled to the square microstrip radiation patch through the first horizontal arm 2 and the second horizontal arm 3 of the two T-shaped probes in the two horizontal directions to radiate, and the linear polarized wave in the x direction is generated at the far field of the antenna.
Further, the port of the transmitting end is excited, the antenna generates linear polarized waves in the y direction, and signals cannot flow out of the port of the receiving end.
Further, the port of the receiving end is excited, the antenna generates linear polarized waves in the x direction, and signals cannot flow out of the port of the transmitting end.
Furthermore, two isolation ports of the 180-degree hybrid loop feed network are used as the transmitting end and the receiving end of the antenna respectively, and the transmitting end and the receiving end of the antenna are excited to generate orthogonal linear polarized waves.
Compared with the prior art, the invention has the following advantages and effects:
1. according to the invention, the 180-degree hybrid ring is used as a feed network of the antenna, and two isolation ports of the 180-degree hybrid ring are used as transmitting and receiving ends of the antenna respectively, so that the transmitting and receiving of the antenna are simultaneously carried out without interference.
2. The invention takes the other two ports of the 180-degree mixing ring as the feed ends of the antenna, utilizes two feed probes to couple to the square patch through the horizontal arms of the two T-shaped probes to radiate signals, wherein when the transmitting end is excited, linear polarized waves in the y direction are generated at the far field of the antenna, and when the receiving end is excited, linear polarized waves in the x direction are generated at the far field of the antenna, so that the isolation characteristic between the transmitting end and the receiving end is further improved.
3. When the transmitting end is excited, the amplitude of signals reaching the two T-shaped probes is equal and the phases are different by 180 degrees, and the generated cross polarization components are mutually offset, so that the cross polarization components on the radiation pattern of the antenna are improved compared with the traditional two-probe feed in-band duplex antenna when the transmitting end is excited.
Drawings
FIG. 1 is a general schematic diagram of the present embodiment and the numbering of the main components;
FIG. 2 is a general schematic of the present embodiment and is numbered in detail;
fig. 3 is a front cross-sectional view of the antenna of the present embodiment;
FIG. 4 is a top view of an upper dielectric substrate according to the present embodiment;
FIG. 5 is a bottom view of the upper dielectric substrate of the present embodiment;
FIG. 6 is a top view of the lower dielectric substrate of the present embodiment;
FIG. 7 is a bottom view of the lower dielectric substrate of the present embodiment;
FIG. 8 is a dimension drawing of the upper surface structure of the upper dielectric substrate of the present embodiment;
FIG. 9 is a dimension drawing of the lower surface structure of the upper dielectric substrate of the present embodiment;
FIG. 10 is a diagram showing the dimension of the upper surface of the lower dielectric substrate according to the present embodiment;
FIG. 11 is a dimension drawing of the lower surface structure of the lower dielectric substrate of the present embodiment;
FIG. 12 (a) is a graph of simulated surface current at 2.4GHz for an in-band full duplex antenna excited by port 1 of this example;
FIG. 12 (b) is a 2.4GHz simulated surface current profile of the in-band full duplex antenna excited by port 2 of this embodiment;
FIG. 13 is a graph of test S-parameters of the antenna of the present embodiment;
fig. 14 (a) is a xoz surface test pattern for excitation of the antenna port 1 (2.4 GHz) of the present embodiment;
fig. 14 (b) is a yoz surface test pattern for excitation of the antenna port 1 (2.4 GHz) of the present embodiment;
fig. 15 (a) is a xoz surface test pattern for excitation of the antenna port 2 (2.4 GHz) of the present embodiment;
fig. 15 (b) is a yoz surface test pattern for excitation of the antenna port 2 (2.4 GHz) of the present embodiment.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples
Referring to fig. 1, 2 and 3, the embodiment is based on an in-band full duplex antenna with a 180-degree hybrid loop, and includes a square microstrip radiation patch 1, two T-type probes for coupling feeding, wherein the two T-type probes are respectively formed by a first horizontal arm 2, a first vertical arm 4, a second horizontal arm 3 and a second vertical arm 5, and a 180-degree hybrid loop feed network, the 180-degree hybrid loop feed network includes a first microstrip line 14 with a third quarter wavelength, a second microstrip line 15, a third microstrip line 16, and a fourth microstrip line 17 with a third quarter wavelength, the square microstrip radiation patch 1 is printed on the upper surface of an upper medium substrate 12, the first horizontal arm 2 and the second horizontal arm 3 for coupling feeding of the two T-type probes are respectively printed on the back surface of the upper medium substrate 12, the 180-degree hybrid loop feed network is printed on the back surface of a lower medium substrate 13, two isolation ports of the 180-degree hybrid loop feed network are respectively connected with the first impedance conversion line 8, the second impedance conversion line 15, the third microstrip line 16, the fourth microstrip line 17 with the first microstrip line 5, the second microstrip line 5, the third microstrip line 5, and the second microstrip line 1 are respectively connected with the upper end of the second vertical arm 4, the second microstrip radiation patch 1, the second microstrip patch 1 is respectively, and the second microstrip patch 1 is respectively connected with the upper end of the second vertical arm 3, and the second microstrip patch 1, and the second microstrip patch is respectively, and the second microstrip patch 1 is connected with the upper end of the upper vertical arm 3, and the lower end of the upper end of the lower microstrip patch.
When transmitting, a transmitting signal is sent in from a transmitting end (port 1), and reaches two ports of the 180-degree mixed loop feeding network through a fifth microstrip line 10 of 50Ω respectively, the two ports are respectively led out by a sixth microstrip line 6 and a seventh microstrip line 7 of 50Ω, then the signals are respectively transmitted to a first horizontal arm 2 and a second horizontal arm 3 of two T-shaped probes, which are two horizontal, by a first vertical arm 4 and a second vertical arm 5 of the two T-shaped probes, and finally the signals are coupled to square patches and radiated by the first horizontal arm 2 and the second horizontal arm 3. Since the signal reaches the first horizontal arm 2 and the second horizontal arm 3 of both levels with equal amplitude and 180 degrees phase difference, a linearly polarized wave in the y direction can be generated at the far field of the antenna.
When receiving the linear polarized wave in the x direction, the received signal is received from the square radiation patch 1, the square radiation patch 1 couples the received signal to the first horizontal arm 2 and the second horizontal arm 3 of the two T-shaped probes at the same time, the first horizontal arm 2 and the second horizontal arm 3 transmit the signal to the first vertical arm 4 and the second vertical arm 5 of the two T-shaped probes at the same time, the first vertical arm 4 and the second vertical arm 5 transmit the signal to the ports of the 180-degree hybrid ring feed network, which are respectively led out by the sixth microstrip line 6 and the seventh microstrip line 7 of 50Ω, and finally the signals transmitted by the sixth microstrip line 6 and the seventh microstrip line 7 reach the first impedance transformation line 8 and the second impedance transformation line 9 at the same time, and are output from the receiving end (port 2).
Fig. 4, 5, 6, and 7 are electrical structure diagrams 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 a dielectric substrate.
Fig. 8, 9, 10, 11 are dimension drawings of the electrical structure of each part.
With reference to fig. 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 100mm and a length a of 100mm. The height h between the two dielectric plates is 6mm. The side length 1a of the square patch and the distance 1b from the edge of the dielectric plate are respectively 44mm and 28mm. The length and width 2a,2b of the first horizontal arm 2 of one T-probe are 5.6mm,2mm, respectively, and the length and width 3a,3b of the second horizontal arm 3 of the other T-probe are 5.6mm,2mm, respectively, the distance 18a,19a between the centers of the two through holes on the reflective floor and the edges of the dielectric plate is 12.5mm, the major dimensions 6a,6b,6c of the 180 degree hybrid ring feed network are 6.78mm,5.42mm,2.25mm,7a,7b,7c are 6.78mm,5.42mm,2.25mm,8a,8b are 19.4mm,1.5mm,9a,9b are 9.6mm,2.25mm,10a,10b are 28.2mm, 14a,14b are 21mm,19.72mm,15a, 21mm,19.72 b are 21mm, 16a, 21 b are 21.72 mm,19.72mm,17a,17b, 19.72mm,17 b, respectively. Port 1 of the antenna operates in the 2.45GHz band as a transmitting port. Port 2 operates in the 2.4GHz band as the receive port. When the port 1 is excited, the antenna can generate linear polarized waves in the y direction in the far field; when the port 2 is excited, the antenna generates a linearly polarized wave in the x-direction in the far field. As can be seen from the surface current distribution of the patch at 2.4GHz in fig. 12. In both bands, the isolation of both ports is greater than 35dB, as shown in fig. 13. When the port 1 of the antenna works, the gain of the antenna at the 2.4GHz of the working frequency of the port 1 is 8.6dBi, the cross polarization ratio of the E surface and the H surface is larger than 25dB, when the port 2 of the antenna works, the gain of the antenna at the 2.14GHz of the working frequency of the port 2 is 8.1dBi, the cross polarization ratio of the E surface is larger than 30dB, and the cross polarization ratio of the H surface is 10dB, as shown in simulation test patterns 14 and 15 of the antenna.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (3)
1. An in-band full duplex antenna based on a 180-degree hybrid ring is characterized by comprising an upper layer dielectric substrate, a lower layer dielectric substrate and two T-shaped probes for coupling feeding, wherein the two T-shaped probes are respectively formed by vertically connecting a first horizontal arm and a first vertical arm and a second horizontal arm and a second vertical arm,
the upper surface of the upper medium substrate is printed with a square microstrip radiation patch, the lower surface of the upper medium substrate is printed with a first horizontal arm and a second horizontal arm, the first horizontal arm and the second horizontal arm are rectangular microstrips and are symmetrically arranged along the diagonal line position of the square microstrip radiation patch and mutually perpendicular;
the upper surface of the lower medium substrate is printed with a reflective floor, the lower surface of the lower medium substrate is printed with a 180-degree hybrid ring feed network, the 180-degree hybrid ring feed network comprises a first microstrip line with a third section of quarter wavelength, a second microstrip line, a third microstrip line and a fourth microstrip line with a section of three-quarterwavelength, the 180-degree hybrid ring feed network comprises four ports, wherein two ports serve as isolation ports and are led out by a first impedance transformation line, a second impedance transformation line and a fifth microstrip line with different impedances and are respectively used as a transmitting end and a receiving end; the other two ports are respectively led out through a sixth microstrip line and a seventh microstrip line and are connected with a first vertical arm and a second vertical arm of the two T-shaped probes;
the signal reaches two T-shaped probes through the port of the transmitting end respectively, the signal amplitude reaching the two T-shaped probes is equal and the phase difference is 180 degrees, then the signal is coupled to the square microstrip radiation patch through the first horizontal arm and the second horizontal arm of the two T-shaped probes in the two horizontal directions to radiate, and the antenna far field is generatedyLinearly polarized waves in the direction;
the signal reaches two T-shaped probes through the port of the receiving end, the amplitude and the phase of the signal reaching the two T-shaped probes are equal, and then the signal is coupled to the square microstrip radiation patch through the first horizontal arm and the second horizontal arm of the two T-shaped probes in the two horizontal directions to radiate, and the signal is generated at the far field of the antennaxLinearly polarized waves in the direction.
2. The 180 degree hybrid loop based in-band full duplex antenna according to claim 1, wherein the sixth microstrip line and the seventh microstrip line are connected to a first vertical arm and a second vertical arm of two T-shaped probes passing through a first via and a second via on the reflective floor and the underlying dielectric substrate, respectively.
3. The full duplex antenna according to claim 1, wherein the first vertical arm and the second vertical arm are metal probes and are located at two symmetrical positions of the geometric center of the square microstrip radiating patch, one ends of the two metal probes are respectively connected with the sixth microstrip line and the seventh microstrip line, and the other ends of the two metal probes respectively pass through the reflective floor and the through holes on the lower dielectric substrate to be connected with the two horizontal arms of the two T-shaped probes.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108682939B (en) * | 2018-04-19 | 2022-12-02 | 深圳三星通信技术研究有限公司 | Filtering antenna |
| CN109216946A (en) * | 2018-09-18 | 2019-01-15 | 重庆金美通信有限责任公司 | A kind of linear polarization multibeam antenna |
| US10756436B2 (en) | 2018-10-18 | 2020-08-25 | Sabanci Universitesi | Double-differential fed, dual polarized patch antenna system with advanced interport RF isolation for IBFD transceivers |
| CN110212940B (en) * | 2019-05-13 | 2021-03-30 | 电子科技大学 | Antenna system for simultaneous same-frequency full duplex communication |
| CN110429385A (en) * | 2019-07-22 | 2019-11-08 | 深圳市易探科技有限公司 | Double polarized micro strip antenna and its signal transmit-receive method for movable sensor |
| CN115832691B (en) * | 2022-12-19 | 2023-07-04 | 杭州电子科技大学 | Double-zero high-isolation dual-polarization straight-through probe patch antenna |
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