CN220652347U - Horizontal polarization antenna - Google Patents
Horizontal polarization antenna Download PDFInfo
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- CN220652347U CN220652347U CN202321896854.3U CN202321896854U CN220652347U CN 220652347 U CN220652347 U CN 220652347U CN 202321896854 U CN202321896854 U CN 202321896854U CN 220652347 U CN220652347 U CN 220652347U
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- 230000010287 polarization Effects 0.000 title description 18
- 230000003071 parasitic effect Effects 0.000 claims abstract description 28
- 230000005855 radiation Effects 0.000 claims abstract description 21
- 239000000758 substrate Substances 0.000 claims abstract description 17
- 239000004020 conductor Substances 0.000 claims abstract description 8
- 239000002184 metal Substances 0.000 claims abstract description 7
- 229910052751 metal Inorganic materials 0.000 claims abstract description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 239000007769 metal material Substances 0.000 claims description 4
- 239000004809 Teflon Substances 0.000 claims description 3
- 229920006362 Teflon® Polymers 0.000 claims description 3
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 238000004891 communication Methods 0.000 abstract description 8
- 238000005388 cross polarization Methods 0.000 abstract description 3
- 230000002401 inhibitory effect Effects 0.000 abstract description 3
- 238000013461 design Methods 0.000 abstract description 2
- 239000000523 sample Substances 0.000 description 27
- 238000005259 measurement Methods 0.000 description 18
- 238000012360 testing method Methods 0.000 description 9
- 239000011358 absorbing material Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 230000005684 electric field Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Abstract
The utility model relates to the technical field of wireless communication, in particular to a horizontally polarized antenna. The annular antenna is integrally arranged in the insulating protection piece and mainly comprises a radiating surface with a feed layer and a grounding layer of a dipole, a dielectric substrate, a coaxial line and a metal sleeve; the inner conductor and the outer conductor of the coaxial line are respectively connected with the feed layer and the middle of the ground layer; the dipole has small size and very uniform current distribution on the horizontal plane, and the sleeve is loaded on the coaxial line and used for inhibiting common mode current, so that very good omnidirectionality is realized; the surface of the radiation surface is provided with parasitic microstrip units and a graded balun structure which are respectively added for adjusting the impedance and the resonant frequency of the loop antenna. The utility model has simple structure design and compact size, keeps low out-of-roundness and low cross polarization in wider bandwidth, and has very wide prospect when applied to darkroom calibration.
Description
Technical Field
The utility model relates to the technical field of wireless communication, in particular to a horizontally polarized antenna.
Background
Wireless communication has evolved from the first generation to the fifth generation of communication, and wireless devices have also become widely popular, so radiation performance testing of wireless devices has also received increasing attention from manufacturers and operators. The space radiation performance test (OTA) is a test method for evaluating wireless terminal equipment, which can measure the radiation characteristics of the wireless communication equipment to be tested in any direction. The microwave darkroom mainly comprises a probe antenna, a rotary turntable, a wave absorbing material, a shielding structure and the like. The device to be tested is placed on the rotary turntable, different testing angles can be switched freely, and the probe antenna is used for measuring the radiation characteristics of the device to be tested. The wave absorbing material on the inner wall of the darkroom is used for absorbing the reflected signals, and simulating the non-reflection space to reduce the interference of the test. In a traditional single-probe microwave darkroom, only one direction of radiation characteristic of the device to be tested can be tested at a time. If the radiation characteristics of the device to be measured in different directions need to be obtained, the turntable is required to rotate at different angles, and the radiation characteristics of the device to be measured in all directions are sequentially measured. This OTA test approach not only requires a significant amount of test time to be consumed, but also has unavoidable mechanical errors. Facing the challenges of the new generation of 5G mobile communications era, there is an increasing demand for high-speed data services. Low-speed measurement of single probe microwave darkroom has been difficult to meet the requirements of OTA high-speed measurement. The multiple probe antennas in the multiple probe antenna measuring darkroom are distributed at different positions and are used for measuring radiation characteristics of the equipment to be measured in different directions. Multi-probe antenna measurement systems have greatly shortened measurement times using multi-probe technology and are therefore increasingly being used in OTA measurements today. In a multi-probe antenna measurement camera, calibration of the multi-probe antenna measurement camera is required before testing to ensure accuracy of measurement due to inconsistencies in the wave absorbing material, inconsistencies in the combination of the wave absorbing material with different probes in the multi-probe antenna measurement camera, and inconsistencies in the gains of different probes.
In the multi-probe antenna measurement darkroom, the probe antenna is a dual-polarized antenna consisting of vertical polarization (vertical polarization in the direction of an electric field which is perpendicular to the paper surface) and horizontal polarization (horizontal polarization in the direction of an electric field which is parallel to the paper surface), so that the calibration of the multi-probe antenna measurement darkroom also needs to be divided into the calibration in the two polarization directions. Since the vertical polarization directions of different probe antennas are identical (perpendicular to the paper plane), a vertically polarized dipole antenna is typically used as a calibration antenna for the vertical polarization directions of the multi-probe darkroom. However, for the calibration of horizontal polarization, the horizontal polarization directions of different probe antennas are different, and if an oriented horizontal polarization antenna is used as the calibration antenna, when the probe antennas at different positions are calibrated, the calibration antenna needs to be rotated by corresponding angles to ensure that the horizontal polarization directions of the calibration antenna are consistent with the horizontal polarization directions of the probe antennas. The calibration mode is very complicated to operate, errors caused by mechanical factors such as a turntable, a position and a rotary joint are difficult to avoid when the angle of the calibration antenna is rotated, and along with the increase of the number of probes, the uncertainty is also increased, so that the accuracy of the calibration is difficult to ensure. Therefore, in order to reduce calibration errors and improve the accuracy of the measurement system, it is an optimal choice to calibrate the horizontal polarization direction with a horizontally polarized omni-directional antenna. The gain variation (also called out-of-roundness) of a horizontally polarized omni-directional calibration antenna determines the accuracy of the multi-probe antenna measurement camera, and therefore, the horizontally polarized omni-directional antenna for horizontal polarization calibration needs to meet very small out-of-roundness. The CTIA standard specifies that the horizontally polarized omnidirectional antenna used for calibration must have a gain fluctuation of less than 0.2dB. It is noted that calibrating the common mode current on the antenna's coaxial line will produce radiation in the cross-polarization direction of the antenna, and this additional radiation will destroy the original radiation characteristics of the antenna, causing several dB errors for the measurement system. Thus, the horizontally polarized omnidirectional antenna used for calibration needs to satisfy low cross polarization performance in addition to very low out-of-roundness itself. At the same time, the miniaturization of microwave darkrooms has driven the design of calibration antennas towards smaller dimensions.
Disclosure of Invention
The technical problem to be solved by the utility model is to provide the horizontally polarized antenna which can be based on the modern wireless communication technology, is specially used for calibrating a multi-probe darkroom measurement system, has the working frequency range of 3.1-3.8GHz and meets CTIA standards, can realize very small out-of-roundness under very small size and well inhibit common mode current.
The technical scheme adopted by the utility model is as follows: the annular antenna is in a disc shape and is placed in an insulating protection piece, and mainly comprises a radiating surface with a feed layer and a grounding layer of a dipole, a dielectric substrate, a coaxial line and a metal sleeve; the feed layer and the grounding layer are respectively printed on the front surface and the back surface of the dielectric substrate, and are formed by four pairs of dipoles and a feed network, and are antenna main body parts, and the inner conductor and the outer conductor of the coaxial line are respectively connected with the right centers of the feed layer and the grounding layer; the dipole has small size and very uniform current distribution on the horizontal plane, and the sleeve is loaded on the coaxial line and used for inhibiting common mode current, so that very good omnidirectionality is realized; the surface of the radiation surface is provided with parasitic microstrip units and a gradual change balun structure which are respectively added for adjusting the impedance and the resonant frequency of the annular antenna; the central axis of the annular antenna is symmetrical, the annular antenna has rotational symmetry, and the symmetrical partial performances of the antenna are guaranteed to be the same.
As a further scheme of the utility model: the radiating surface, the grounding surface and the sleeve of the annular antenna are made of metal materials, and can be made of red copper or stainless steel.
As a further scheme of the utility model: the insulating protection piece of the annular antenna is made of plastic material and can be made of Teflon or ABS resin, the length of the insulating protection piece is 77mm, and the thickness of the insulating protection piece is 2mm.
As a further scheme of the utility model: the shape of the radiation surface of the annular antenna is circular, and the width of the radiation surface ranges from 3mm to 50 mm.
As a further scheme of the utility model: the dipole length of the annular antenna is equal to the length corresponding to one quarter wavelength of the center frequency of the working frequency band of the antenna.
As a further scheme of the utility model: the parasitic unit printed on the front surface of the dielectric substrate of the loop antenna is positioned above the dipole, the input impedance of the loop antenna is adjusted by adjusting the length and the position of the parasitic unit, the impedance matching of the loop antenna and the coaxial line is realized, the length of the parasitic unit is smaller than the length of the dipole, and the width of the parasitic unit is slightly larger than the width of the dipole.
As a further scheme of the utility model: the T-shaped parasitic units printed on the back surface of the dielectric substrate of the annular antenna are symmetrically distributed in a 45-degree direction with the dipole; the length and width of the T-shaped parasitic element are adjusted to adjust the working frequency and out-of-roundness of the loop antenna, the length of the parasitic element is larger than the length of the dipole, and the width of the parasitic element is smaller than the width of the dipole.
As a further scheme of the utility model: the sleeve is made of red copper, is cylindrical in shape, and is 21mm in length and 2mm in thickness.
As a further scheme of the utility model: the feed layer and the ground plane of the loop antenna have metal thickness, but the thickness is not limited, and the thickness of the dielectric substrate is 1 mm.
Compared with the prior art, the utility model has the beneficial effects that:
the utility model can be based on the modern wireless communication technology, is specially aimed at the calibration of a multi-probe darkroom measurement system, has the working frequency band of 3.1-3.8GHz and meets CTIA standards, can realize very small out-of-roundness under very small size, and well inhibits common mode current;
overall, the loop antenna has compact size and simple structure, and realizes out-of-roundness lower than 0.2Db in the 3.1-3.8GHz frequency band; the coaxial line is loaded with the sleeve, so that common mode current is well restrained, and the coaxial line has good omnidirectionality in darkroom testing.
Drawings
The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate the utility model and together with the embodiments of the utility model, serve to explain the utility model. In the drawings:
fig. 1 is an overall perspective view of a horizontally polarized antenna of the present utility model.
Fig. 2 is a front view of a horizontally polarized antenna of the present utility model.
Fig. 3 is a right side view of a horizontally polarized antenna of the present utility model.
Fig. 4 is a complete package diagram of a horizontally polarized antenna according to the present utility model.
Fig. 5 is a graph showing the simulation result of the reflection coefficient of a horizontally polarized antenna according to the present utility model.
Fig. 6 is a graph of the out-of-roundness simulation results for a horizontally polarized antenna of the present utility model.
In the accompanying drawings:
( 1. A feed layer; 2. a ground layer; 3. a sleeve; 4. a coaxial line; 5. a dielectric substrate; 6. insulation protection piece )
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1-6, the present utility model provides a technical solution:
in order to make the horizontal polarization antenna based on the modern wireless communication technology, especially for the calibration of the multi-probe darkroom measurement system, the working frequency band is 3.1-3.8GHz and meets CTIA standard, and the antenna can realize very small out-of-roundness under very small size and well inhibit common mode current, the utility model provides a horizontal polarization antenna as shown in the figure:
the antenna comprises a ring antenna and an insulating protection piece 6, wherein the ring antenna is integrally disc-shaped and is placed in the insulating protection piece 6, and the ring antenna mainly comprises a radiating surface with a feed layer 1 and a grounding layer 2 of a dipole, a dielectric substrate 5, a coaxial line 4 and a metal sleeve 3. The feed layer 1 and the grounding layer 2 are respectively printed on the front side and the back side of the dielectric substrate 5, and are formed by four pairs of dipoles and a feed network, and are an antenna main body part, and the inner conductor and the outer conductor of the coaxial line 4 are respectively connected with the centers of the feed layer 1 and the grounding layer 2; the dipole has small size and very uniform current distribution on the horizontal plane, and the sleeve is loaded on the coaxial line and used for inhibiting common mode current, so that very good omnidirectionality is realized; the surface of the radiation surface is provided with parasitic microstrip units and a gradual change balun structure which are respectively added for adjusting the impedance and the resonant frequency of the annular antenna; the central axis of the annular antenna is symmetrical, the annular antenna has rotational symmetry, and the symmetrical partial performances of the antenna are guaranteed to be the same.
As shown in fig. 4, the tag antenna is integrally placed in the insulating protector 6.
In the embodiment of the utility model, the radiating surface, the ground surface and the sleeve of the loop antenna are made of metal material, and can be made of red copper or stainless steel.
In the embodiment of the present utility model, the insulating protection member 6 of the loop antenna is made of plastic material, which may be teflon or ABS resin, and has a length of 77mm and a thickness of 2mm.
In the embodiment of the utility model, the radiation surface of the annular antenna is circular in shape, and the width of the radiation surface is between 3mm and 50 mm.
In the embodiment of the utility model, the dipole length of the loop antenna is equal to the length corresponding to one quarter wavelength of the center frequency of the working frequency band of the antenna.
In the embodiment of the utility model, the parasitic element printed on the front surface of the dielectric substrate of the loop antenna is positioned above the dipole, and the input impedance of the loop antenna is adjusted by adjusting the length and the position of the parasitic element, so that the impedance matching of the loop antenna and the coaxial line 4 is realized, the length of the parasitic element is smaller than the length of the dipole, and the width of the parasitic element is slightly larger than the width of the dipole.
In the embodiment of the utility model, the T-shaped parasitic units printed on the back surface of the dielectric substrate 5 of the annular antenna are symmetrically distributed in a 45-degree direction with the dipole; the length and width of the T-shaped parasitic element are adjusted to adjust the working frequency and out-of-roundness of the loop antenna, the length of the parasitic element is larger than the length of the dipole, and the width of the parasitic element is smaller than the width of the dipole.
In the embodiment of the present utility model, the sleeve 3 is made of red copper, is cylindrical, has a length of 21mm, and has a thickness of 2mm.
In the embodiment of the utility model, the feeding layer and the ground plane of the loop antenna have metal thickness, but the thickness is not limited, and the thickness of the dielectric substrate 5 is 1 mm.
The implementation effect results of the application can be obtained through the non-circularity simulation result graph aiming at the application and the reflection coefficient simulation result graph in the graph 6 in the graph 5, which show that the annular antenna is compact in size and simple in structure, the non-circularity is lower than 0.2dB in the frequency band of 3.1-3.8GHz, the common mode current is well restrained by loading the sleeve on the coaxial line, the omni-directionality is good in the darkroom test, the working frequency band is 3.1-3.8GHz aiming at the calibration of the multi-probe darkroom measurement system, the CTIA standard is met, and the antenna is verified to be capable of realizing very small non-circularity in very small size and well restrained the common mode current.
The annular antenna has compact size and simple structure, and realizes out-of-roundness lower than 0.2dB in the frequency band of 3.1-3.8 GHz. The coaxial line is loaded with the sleeve, so that common mode current is well inhibited, and the coaxial line has good omnidirectionality in darkroom test
The utility model and its embodiments have been described above with no limitation, and the actual construction is not limited to the embodiments of the utility model as shown in the drawings. In summary, if one of ordinary skill in the art is informed by this disclosure, a structural manner and an embodiment similar to the technical solution should not be creatively devised without departing from the gist of the present utility model.
Claims (9)
1. A horizontally polarized antenna, characterized by: the antenna comprises a ring antenna and an insulating protection piece (6), wherein the ring antenna is integrally disc-shaped and is placed in the insulating protection piece (6), and the ring antenna comprises a radiating surface of a feed layer (1) and a grounding layer (2) of a dipole, a dielectric substrate (5), a coaxial line (4) and a metal sleeve (3); the feed layer (1) and the grounding layer (2) are respectively printed on the front side and the back side of the dielectric substrate (5), and are composed of four pairs of dipoles and a feed network, and are antenna main body parts, and the inner conductor and the outer conductor of the coaxial line (4) are respectively connected with the centers of the feed layer (1) and the grounding layer (2); the surface of the radiation surface is provided with a parasitic microstrip unit and a gradual change balun structure which are respectively added for adjusting the impedance and the resonant frequency of the annular antenna; the annular antenna is symmetrical in central axis and has rotational symmetry.
2. A horizontally polarized antenna according to claim 1 wherein: the radiating surface, the grounding surface and the sleeve (3) of the annular antenna are all made of metal materials, and the metal materials are selected from one of red copper and stainless steel.
3. A horizontally polarized antenna according to claim 1 wherein: the insulating protection piece (6) of the annular antenna is made of one of Teflon and ABS resin, and the length of the insulating protection piece (6) of the annular antenna is 77mm and the thickness of the insulating protection piece is 2mm.
4. A horizontally polarized antenna according to claim 1 wherein: the shape of the annular antenna radiation surface is circular, and the width of the annular antenna radiation surface is 3mm-50 mm.
5. A horizontally polarized antenna according to claim 1 wherein: the dipole length of the annular antenna is equal to the length corresponding to one quarter wavelength of the center frequency of the working frequency band of the antenna.
6. A horizontally polarized antenna according to claim 1 wherein: the parasitic unit printed on the front surface of the dielectric substrate (5) of the loop antenna is positioned above the dipole, the input impedance of the loop antenna is adjusted by adjusting the length and the position of the parasitic unit, the impedance matching of the loop antenna and the coaxial line (4) is realized, the length of the parasitic unit is smaller than the length of the dipole, and the width of the parasitic unit is slightly larger than the width of the dipole.
7. A horizontally polarized antenna according to claim 1 wherein: the T-shaped parasitic units printed on the back surface of the dielectric substrate (5) of the annular antenna are symmetrically distributed on the direction 45 degrees with the dipole; and adjusting the length and the width of the T-shaped parasitic element to adjust the working frequency and the out-of-roundness of the loop antenna, wherein the length of the parasitic element is larger than the length of the dipole, and the width of the parasitic element is smaller than the width of the dipole.
8. A horizontally polarized antenna according to claim 1 wherein: the sleeve (3) is made of red copper, is cylindrical in shape, and has a length of 21mm and a thickness of 2mm.
9. A horizontally polarized antenna according to claim 1 wherein: the feed layer (1) and the ground plane of the loop antenna have metal thickness and thickness limitation, and the thickness of the dielectric substrate (5) is 1 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321896854.3U CN220652347U (en) | 2023-07-19 | 2023-07-19 | Horizontal polarization antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321896854.3U CN220652347U (en) | 2023-07-19 | 2023-07-19 | Horizontal polarization antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220652347U true CN220652347U (en) | 2024-03-22 |
Family
ID=90287269
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321896854.3U Active CN220652347U (en) | 2023-07-19 | 2023-07-19 | Horizontal polarization antenna |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220652347U (en) |
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2023
- 2023-07-19 CN CN202321896854.3U patent/CN220652347U/en active Active
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