CN110854514A - Differential feed dual-polarized antenna with broadband harmonic suppression - Google Patents
Differential feed dual-polarized antenna with broadband harmonic suppression Download PDFInfo
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- CN110854514A CN110854514A CN201910996595.3A CN201910996595A CN110854514A CN 110854514 A CN110854514 A CN 110854514A CN 201910996595 A CN201910996595 A CN 201910996595A CN 110854514 A CN110854514 A CN 110854514A
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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
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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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
- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/20—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements characterised by the operating wavebands
Abstract
The invention discloses a differential feed dual-polarized antenna with broadband harmonic suppression, which comprises an antenna reflecting plate at the bottom and an antenna radiator dielectric plate at the top, wherein the antenna radiator dielectric plate consists of a top layer circuit and a bottom layer circuit, the bottom layer circuit comprises a central square patch and eight open resonant slots respectively corroded at four right angles of the central square patch, the top layer circuit comprises eight stepped feeder lines respectively used for exciting the eight open resonant slots, a short-circuit branch microstrip line is respectively corroded between two adjacent stepped feeder lines, and a short circuit point which is in short circuit with the square patch is arranged at the tail end of the short-circuit branch microstrip line. In the antenna disclosed by the invention, the eight opening resonance grooves are respectively corroded at the four right angles of the central square patch, so that a symmetrical radiation pattern and low cross polarization are realized.
Description
Technical Field
The invention belongs to the field of dual-polarized antennas in wireless communication, and particularly relates to a differential feed dual-polarized antenna with broadband harmonic suppression in the field.
Background
Because the differential circuit system has the advantages of high common mode rejection degree, low noise and the like, the differential electronic device and the differential radio frequency microwave circuit system are widely researched by researchers. The conventional single-ended antenna cannot be directly connected with the differential circuitry, and usually needs a broadband single-ended to differential power divider or balun for signal conversion, but this introduces additional insertion loss and undesirable impedance mismatch into the differential circuitry, so that a differential-driven antenna usually needs to be directly introduced into the differential circuitry, and thus, the antenna can be directly connected with the differential circuitry, thereby reducing the undesirable insertion loss and impedance mismatch. In addition, compared with a single polarized antenna, the dual polarized antenna can effectively overcome the multipath effect and increase the capacity of a channel, so that the dual polarized antenna with the differential feed function is researched more and more.
In wireless communication, harmonic suppression is always an important assessment index influencing the quality of a communication system, because harmonic radiation at a transmitting end can cause saturation of amplifying devices such as a power amplifier and the like, the working efficiency of the amplifying devices is reduced, and strong interference signals are generated to cause interference to nearby receiving systems; if the strong harmonic signal is received by the receiver, the sensitivity of the receiving end is reduced, even the receiving end is blocked, so that the receiving end cannot receive the normal useful signal. As an antenna at the end of radio frequency, if the antenna can effectively suppress harmonics outside the operating bandwidth, the performance of the whole communication system is greatly improved at both the transmitting end and the receiving end.
Disclosure of Invention
The invention aims to provide a differential feed dual-polarized antenna with a broadband harmonic suppression function.
The invention adopts the following technical scheme:
in a differential-feed dual-polarized antenna with broadband harmonic suppression, the improvement comprising: the antenna comprises an antenna reflecting plate at the bottom and an antenna radiator dielectric plate at the top, wherein the antenna radiator dielectric plate consists of a top layer circuit and a bottom layer circuit, the bottom layer circuit comprises a central square patch and eight open resonant slots respectively corroded at four right angles of the central square patch, the top layer circuit comprises eight stepped feeder lines respectively used for exciting the eight open resonant slots, a short-circuit branch microstrip line is corroded between two adjacent step-type feeder lines, a short-circuit point which is short-circuited with the square patch is arranged at the tail end of the short-circuit branch microstrip line, four stepped impedance resonators are corroded in an area defined by eight stepped feeder lines, metal inner cores at the top ends of the four differential feed coaxial cables are respectively connected with an input end of one stepped impedance resonator, outer metal skins at the top ends of the four differential feed coaxial cables are respectively connected with the square patches, and the bottom ends of the four differential feed coaxial cables are respectively connected with the antenna reflection plate.
Furthermore, the antenna reflecting plate is a metal reflecting plate.
Further, the length of the square patch is half the guide wavelength of the resonant frequency of the patch mode.
Furthermore, a short-circuit point connected with the short-circuit branch microstrip line is arranged between two adjacent open-ended resonant grooves.
Further, the length of the open resonant tank is half the guided wavelength of the resonant frequency of the tank.
Further, the length of the stepped feed line is one-fourth of the guide wavelength of the monopole mode resonant frequency.
Further, the stepped impedance resonator is composed of two microstrip lines with different impedances.
Furthermore, the antenna can cover a frequency band of 1.70-2.81 GHz, and the port reflection coefficient is smaller than-15 dB.
Furthermore, the reflection coefficient of the antenna in a harmonic frequency band of 3-9 GHz is larger than-2.2 dB; the gain of the antenna in the impedance bandwidth is 7.2-7.9 dBi, and the lobe width is 63-71 degrees.
Further, the antenna may be extended to an antenna array, and the form of the antenna array includes, but is not limited to, a linear array and an area array.
The invention has the beneficial effects that:
in the antenna disclosed by the invention, the eight opening resonance grooves are respectively corroded at the four right angles of the central square patch, so that a symmetrical radiation pattern and low cross polarization are realized. The stepped feed line is used to excite the open resonant slot and introduce a new monopole resonant mode. The square patch then introduces a patch radiation pattern. The short-circuit branch microstrip line is used for matching the three different resonance modes to obtain broadband impedance matching. By introducing a stepped impedance resonator above the square patch, a wide band harmonic suppression function is achieved without an additional increase in antenna size. And a metal reflecting plate is arranged below the antenna radiator dielectric plate to realize directional radiation.
The antenna disclosed by the invention can cover a frequency band of 1.70-2.81 GHz, and the reflection coefficient of a port is smaller than-15 dB. Has high harmonic suppression effect in a harmonic frequency band of 3-9 GHz, and the reflection coefficient of the harmonic suppression effect is larger than-2.2 dB. The gain is 7.2-7.9 dBi in the impedance bandwidth, the lobe width is 63-71 degrees, and the stable directional diagram radiation characteristic is achieved.
The antenna disclosed by the invention has the advantages of stable gain, lobe width, directional diagram and the like, and can be widely applied to the wireless communication fields of satellite communication, base station communication, radar communication and the like.
Drawings
Fig. 1 is a perspective view of a three-dimensional structure of an antenna disclosed in embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram of a top-layer circuit of a dielectric plate of an antenna radiator disclosed in embodiment 1 of the present invention;
fig. 3 is a schematic structural diagram of a bottom-layer circuit of a dielectric plate of an antenna radiator disclosed in embodiment 1 of the present invention;
fig. 4 is a schematic side view of an antenna disclosed in embodiment 1 of the present invention;
fig. 5 is a diagram of S parameter results of the antenna test and simulation disclosed in embodiment 1 of the present invention;
fig. 6 is a test and simulation pattern of the antenna disclosed in embodiment 1 of the present invention at a center frequency point;
fig. 7 is a graph of lobe width and gain data results of antenna testing and simulation as disclosed in embodiment 1 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Embodiment 1, as shown in fig. 1 to 4, this embodiment discloses a differential feed dual polarized antenna with broadband harmonic suppression, the antenna includes a bottom antenna reflection plate 2 and a top antenna radiator dielectric plate 1, the antenna radiator dielectric plate is a dielectric plate printed on both sides and is composed of a top layer circuit 4 and a bottom layer circuit 5, the bottom layer circuit includes a central square patch 10 and eight open resonant slots 9 respectively corroded at four right angles of the central square patch, the top layer circuit includes eight stepped feed lines 6 respectively used for exciting the eight open resonant slots, a short-circuit stub microstrip line 7 is corroded between two adjacent stepped feed lines, a short-circuit point short-circuited with the square patch is arranged at the end of the short-circuit stub microstrip line, four stepped impedance resonators 8 are corroded in an area surrounded by the eight stepped feed lines, the metal inner cores at the top ends of the four differential feed coaxial cables 3 are respectively connected with the input end of a stepped impedance resonator, the outer metal skins at the top ends are respectively connected with the square patches, and the bottom ends are respectively connected with the antenna reflection plate.
In this embodiment, a short-circuit point connected to the short-circuit stub microstrip line is disposed between two adjacent open resonant slots. The stepped impedance resonator consists of two microstrip lines with different impedances.
Simulation and actual measurement prove that the antenna has wide impedance bandwidth, can cover a frequency band of 1.70-2.81 GHz, and has a port reflection coefficient smaller than-15 dB.
The antenna disclosed in the present embodiment can be extended to an antenna array, and the form of the antenna array includes, but is not limited to, a linear array and an area array.
In the antenna disclosed in this embodiment, eight open resonant slots are respectively etched at four right angles of the central square patch, and a symmetric radiation pattern and low cross polarization are realized by differential feeding. The open-ended resonant tank length, which in this embodiment is about one-half the guide wavelength of the tank resonant frequency, controls the resonant frequency of the tank resonant mode, which can be effectively tuned by adjusting the open-ended resonant tank length.
The stepped feed line is used to excite the open resonant slot and introduce a new monopole resonant mode. The corresponding resonant frequency can be effectively adjusted by adjusting the length of the step type feeder line. In this embodiment, the length of the stepped feed line is approximately one-quarter of the guide wavelength of the monopole mode resonant frequency.
The square patch positioned in the center introduces a patch radiation mode, and the corresponding resonant frequency can be effectively adjusted by controlling the length of the square patch. In this embodiment, the length of the square patch is approximately half the guide wavelength of the patch mode resonant frequency.
And the broadband impedance matching is carried out on three different resonance modes of the antenna by adjusting the length of the short-circuit branch microstrip line. And carrying out optimal broadband impedance matching on the input impedance of the antenna by researching the change rule of the real part and the imaginary part of the input impedance of the antenna.
The stepped impedance resonator above the square patch has a broadband harmonic suppression function. By adjusting the size parameters of the stepped impedance resonator, the function of broadband harmonic suppression is controlled and realized, and the additional antenna size is not increased, and the impedance performance and the radiation performance of the antenna are not influenced.
The different components of the antenna are respectively corroded on the top layer and the bottom layer of the antenna radiator dielectric plate to realize the integrated design. The antenna reflecting plate below the antenna radiator dielectric plate is a metal reflecting plate so as to realize stable directional radiation of the antenna, and the antenna has stable gain and lobe broadband. The antenna adopts a differential feeding form and can be applied to a differential circuit communication system. Because the antenna adopts a differential feed mode, the antenna has the advantages of high isolation, low cross polarization and the like.
Fig. 5 is a S-parameter result diagram of the test and simulation of the differential feed dual-polarized antenna with broadband harmonic suppression according to the present invention. The result shows that the 15dB differential return loss bandwidth of the antenna is 1.7-2.81 GHz, and the corresponding isolation degree is higher than 39 dB. Meanwhile, the antenna has good harmonic suppression degree in three octaves, and the corresponding harmonic reflection coefficient is larger than-2.2 dB in a frequency band from 3GHz to 9 GHz.
Fig. 6 is a test and simulation directional diagram of the differential feed dual polarized antenna with broadband harmonic suppression of the present invention at a center frequency point. The tested cross polarization was better than 29dB in the broadside direction and better than 23dB in the plus and minus 30 degree directions. The front-to-back ratio is higher than 16 dB.
Fig. 7 is a lobe width and gain data result diagram of the test and simulation of the differential feed dual polarized antenna with broadband harmonic suppression of the present invention. The corresponding lobe width is 63-71 degrees in the impedance bandwidth range, and the gain is stabilized at 7.2-7.9 dBi. The harmonic radiation gain of the frequency band is lower than-5.3 dBi in the range of three octaves of 3-9 GHz.
Claims (10)
1. A differential feed dual polarized antenna with broadband harmonic suppression, characterized in that: the antenna comprises an antenna reflecting plate at the bottom and an antenna radiator dielectric plate at the top, wherein the antenna radiator dielectric plate consists of a top layer circuit and a bottom layer circuit, the bottom layer circuit comprises a central square patch and eight open resonant slots respectively corroded at four right angles of the central square patch, the top layer circuit comprises eight stepped feeder lines respectively used for exciting the eight open resonant slots, a short-circuit branch microstrip line is corroded between two adjacent step-type feeder lines, a short-circuit point which is short-circuited with the square patch is arranged at the tail end of the short-circuit branch microstrip line, four stepped impedance resonators are corroded in an area defined by eight stepped feeder lines, metal inner cores at the top ends of the four differential feed coaxial cables are respectively connected with an input end of one stepped impedance resonator, outer metal skins at the top ends of the four differential feed coaxial cables are respectively connected with the square patches, and the bottom ends of the four differential feed coaxial cables are respectively connected with the antenna reflection plate.
2. The differential-feed dual-polarized antenna with broadband harmonic suppression according to claim 1, wherein: the antenna reflecting plate is a metal reflecting plate.
3. The differential-feed dual-polarized antenna with broadband harmonic suppression according to claim 1, wherein: the length of the square patch is half the guide wavelength of the resonant frequency of the patch mode.
4. The differential-feed dual-polarized antenna with broadband harmonic suppression according to claim 1, wherein: and a short-circuit point connected with the short-circuit branch microstrip line is arranged between two adjacent open resonant grooves.
5. The differential-feed dual-polarized antenna with broadband harmonic suppression according to claim 1, wherein: the length of the open resonant tank is one-half the guided wavelength of the tank resonant frequency.
6. The differential-feed dual-polarized antenna with broadband harmonic suppression according to claim 1, wherein: the length of the stepped feed line is one quarter of the guide wavelength of the monopole mode resonant frequency.
7. The differential-feed dual-polarized antenna with broadband harmonic suppression according to claim 1, wherein: the stepped impedance resonator consists of two microstrip lines with different impedances.
8. The differential-feed dual-polarized antenna with broadband harmonic suppression according to claim 1, wherein: the antenna can cover a frequency band of 1.70-2.81 GHz, and the port reflection coefficient is smaller than-15 dB.
9. The differential-feed dual-polarized antenna with broadband harmonic suppression according to claim 1, wherein: the reflection coefficient of the antenna is larger than-2.2 dB in the harmonic frequency band of 3-9 GHz; the gain of the antenna in the impedance bandwidth is 7.2-7.9 dBi, and the lobe width is 63-71 degrees.
10. The differential-feed dual-polarized antenna with broadband harmonic suppression according to claim 1, wherein: the antenna may be extended to antenna arrays in forms including, but not limited to, linear and planar arrays.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910996595.3A CN110854514A (en) | 2019-10-19 | 2019-10-19 | Differential feed dual-polarized antenna with broadband harmonic suppression |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910996595.3A CN110854514A (en) | 2019-10-19 | 2019-10-19 | Differential feed dual-polarized antenna with broadband harmonic suppression |
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| Publication Number | Publication Date |
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| CN110854514A true CN110854514A (en) | 2020-02-28 |
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| CN201910996595.3A Pending CN110854514A (en) | 2019-10-19 | 2019-10-19 | Differential feed dual-polarized antenna with broadband harmonic suppression |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113497356A (en) * | 2021-07-13 | 2021-10-12 | 西安电子科技大学 | Dual-band dual-polarization filtering antenna |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103560316A (en) * | 2013-11-04 | 2014-02-05 | 北京邮电大学 | Dual-frequency broadband differential antenna |
| CN108336491A (en) * | 2018-04-02 | 2018-07-27 | 安徽大学 | Dual-band and dual-polarization laminated patch antenna and its design method based on microstrip balun feed |
-
2019
- 2019-10-19 CN CN201910996595.3A patent/CN110854514A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103560316A (en) * | 2013-11-04 | 2014-02-05 | 北京邮电大学 | Dual-frequency broadband differential antenna |
| CN108336491A (en) * | 2018-04-02 | 2018-07-27 | 安徽大学 | Dual-band and dual-polarization laminated patch antenna and its design method based on microstrip balun feed |
Non-Patent Citations (1)
| Title |
|---|
| LE-HU WEN等: "A Wideband Differentially Fed Dual-Polarized Antenna With Wideband Harmonic Suppression", <IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113497356A (en) * | 2021-07-13 | 2021-10-12 | 西安电子科技大学 | Dual-band dual-polarization filtering antenna |
| CN113497356B (en) * | 2021-07-13 | 2022-10-25 | 西安电子科技大学 | Dual-band dual-polarization filtering antenna |
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