CN114865298B - Planar ultra-wideband circularly polarized antenna - Google Patents
Planar ultra-wideband circularly polarized antenna Download PDFInfo
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- CN114865298B CN114865298B CN202210604586.7A CN202210604586A CN114865298B CN 114865298 B CN114865298 B CN 114865298B CN 202210604586 A CN202210604586 A CN 202210604586A CN 114865298 B CN114865298 B CN 114865298B
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- 230000005404 monopole Effects 0.000 claims abstract description 38
- 230000005855 radiation Effects 0.000 claims abstract description 30
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- 238000005859 coupling reaction Methods 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 4
- 239000006185 dispersion Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
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- 230000000694 effects Effects 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Abstract
The invention relates to a planar ultra-wideband circularly polarized antenna, which comprises a dielectric substrate, a quarter-round monopole radiation patch, a bent microstrip branch node line, a round patch, a coplanar waveguide feeder line and a pair of asymmetric coplanar waveguide ground planes, wherein the monopole radiation patch is connected with the coplanar waveguide feeder line and is arranged above the dielectric substrate, and the bent microstrip branch node line is connected with the left side of the monopole radiation patch; the circular patch is coupled to the right side of the monopole radiating patch; the pair of asymmetric coplanar waveguide ground planes are respectively arranged on the left side and the right side of the coplanar waveguide feeder line. The invention has simple and reasonable structural design, compact antenna size, larger axial ratio bandwidth, simple feed structure, wider bandwidth and wide application prospect.
Description
Technical field:
The invention belongs to the technical field of microwave antennas, and particularly relates to a planar ultra-wideband circularly polarized antenna.
The background technology is as follows:
In recent years, circular Polarized (CP) antennas have attracted considerable attention in wireless systems such as navigation, radar, satellite, and RFID systems due to their flexibility in the angle of orientation between the transmitter and receiver, better mobility and weather penetration, and reduced multipath reflections. Circular polarization can be achieved by exciting two equal amplitude quadrature modes with a phase difference of 90 °. Printed antennas have the advantages of low cost, simplicity of manufacture, low profile, etc., and are often employed in CP antenna designs. Coplanar waveguide (CPW) fed microstrip antennas are similar to aperture coupled microstrip antennas in that Electromagnetic (EM) energy is coupled to a radiating patch through a coupling slot, and are simple in structure, with only two metallization level structures. CPW feed has small dispersion, low radiation loss, and can reach millimeter wave frequency band. Microstrip antennas with CPW feeds also facilitate integration of active devices and allow series and shunt connections to be made on one side of the substrate, avoiding hole connections.
To increase the range of indoor communications and wireless local area networks, experts and scholars have designed various circularly polarized ultra wideband antennas based on coplanar waveguides (CPWs).
Literature 1：Chien-Yuan Pan and Chum-Chieh Su. "CPW-fed modified rhombus slot antenna with circularly polarized radiation for UHF RFID fixed reader application." Journal of Electromagnetic Waves and Applications 34.4 (2020): 559-569. proposes a diamond slot antenna based on coplanar waveguide (CPW) feed. The antenna has ultra-high band Circularly Polarized (CP) radiation for use in rfid fixed reader applications. But the antenna size is larger and the axial ratio bandwidth is smaller.
Document 2：Xu Rui, Zhongxiang Shen and Steven Gao. "Compact-Size Ultra-Wideband Circularly Polarized Antenna with Stable Gain and Radiation Pattern." IEEE Transactions on Antennas and Propagation (2021). proposes an Ultra Wideband (UWB) Circularly Polarized (CP) antenna array with sequential phase feeding. The element implements a multi-resonant monopole to achieve UWB CP radiation. But the feed structure of the antenna is complex and the size is large.
The circularly polarized antenna not only requires good axial ratio characteristics, but also radiates circularly polarized waves, and has higher requirements on the performances of broadband, miniaturization, multifunction and the like of the antenna. The design of monopole antennas with wide AR bandwidth and impedance bandwidth remains a challenging problem for antenna designers.
The invention comprises the following steps:
The invention aims at improving the problems existing in the prior art, namely the technical problem to be solved by the invention is to provide a planar ultra-wideband circularly polarized antenna.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: a planar ultra-wideband circularly polarized antenna comprises a dielectric substrate, a quarter-round monopole radiation patch, a bent microstrip branch node line, a round patch, a coplanar waveguide feeder line and a pair of asymmetric coplanar waveguide ground planes, wherein the monopole radiation patch is connected with the coplanar waveguide feeder line and is arranged above the dielectric substrate, and the bent microstrip branch node line is connected with the left side of the monopole radiation patch; the circular patch is coupled to the right side of the monopole radiating patch; the pair of asymmetric coplanar waveguide ground planes are respectively arranged on the left side and the right side of the coplanar waveguide feeder line.
Further, the bent microstrip branch node line is arranged at the upper left part of the monopole radiation patch and is flush with the upper part of the monopole radiation patch.
Further, the circular patch is coupled to the upper right side of the monopole radiating patch through a coupling slot.
Further, the pair of asymmetric coplanar waveguide ground planes includes a left coplanar waveguide ground plane and a right coplanar waveguide ground plane, and the lengths and widths of the left and right coplanar waveguide ground planes are different, so that the current directions of the left and right coplanar waveguide ground planes are different by 90 °.
Furthermore, the copper sheet is not covered below the dielectric substrate.
Compared with the prior art, the invention has the following effects: the invention has simple and reasonable structural design, compact antenna size, larger axial ratio bandwidth, simple feed structure, wider bandwidth and wide application prospect.
Description of the drawings:
FIG. 1 is a schematic top view of an embodiment of the present invention;
FIG. 2 is a graph showing the reflection coefficient of an antenna according to an embodiment of the present invention;
FIG. 3 is a graph of a test of antenna axis ratio in an embodiment of the invention;
fig. 4 is a radiation pattern of xoz and yoz planes of far field radiation of an antenna at different frequencies of operation 6GHz, 7.5 GHz, and 9 GHz in an embodiment of the present invention;
FIG. 5 is a graph of the peak gain measurement of an antenna in an embodiment of the present invention; ;
Fig. 6 is a table of preferred structural parameters associated with an antenna in an embodiment of the present invention.
In the figure:
1-monopole radiating patches; 2-bending a microstrip branch node line; 3-a circular patch; 4-left side coplanar waveguide ground plane; 5-right side coplanar waveguide ground plane; 6-coplanar waveguide feeder; 7-dielectric substrate.
The specific embodiment is as follows:
the invention will be described in further detail with reference to the drawings and the detailed description.
In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
As shown in fig. 1, the planar ultra-wideband circularly polarized antenna of the invention comprises a dielectric substrate 7, a quarter-circular monopole radiating patch 1, a bent microstrip branch node line 2, a circular patch 3, a coplanar waveguide feeder line 6 and a pair of asymmetric coplanar waveguide ground planes, wherein the monopole radiating patch 1 is connected with the coplanar waveguide feeder line 6 and is arranged above the dielectric substrate 7; the bent microstrip branch node line 2 is connected with the left side of the monopole radiation patch 1 to generate a horizontal component; the circular patch 3 is coupled to the right side of the monopole radiating patch 1; a pair of asymmetric coplanar waveguide ground planes are respectively disposed on the left and right sides of the coplanar waveguide feeder 6. In the antenna, a quarter-circular monopole radiation patch sheet generates vertical polarized waves, a bent microstrip branch node line generates horizontal polarized waves, and the two waves are called circular polarized waves in far field; the bent microstrip branch line also expands impedance bandwidth, and the grounding plates with different lengths on two sides of the feeder line improve axial ratio characteristics and increase axial ratio bandwidth; coupling circular patches further widens the axial ratio bandwidth. The coplanar waveguide feeder is fed by a coplanar waveguide between a pair of asymmetric coplanar waveguide ground planes, and the feeding mode has small dispersion and low radiation loss, and can reach millimeter wave frequency bands at most.
In this embodiment, the bent microstrip branch node line 2 is disposed at the upper left of the monopole radiating patch 1 and is flush with the upper side of the monopole radiating patch 1. The bent microstrip branch node line can generate a horizontal electromagnetic component, and a resonance point is introduced in the frequency band of 10 GHz-12 GHz to widen the impedance bandwidth.
In this embodiment, the circular patch 3 is coupled at the upper right side of the monopole radiating patch 1 through a coupling slot, and the energy of the circular patch is provided by the monopole through the coupling slot, so that the axial ratio bandwidth is increased.
In this embodiment, the pair of asymmetric coplanar waveguide ground planes includes a left coplanar waveguide ground plane 4 and a right coplanar waveguide ground plane 5 that are respectively disposed on the left and right sides of the feeder line, and the lengths and widths of the left coplanar waveguide ground plane 4 and the right coplanar waveguide ground plane 5 are different, so that the current directions of the left coplanar waveguide ground plane and the right coplanar waveguide ground plane differ by 90 °, and the axial ratio is further improved. The grounding surfaces with unequal lengths on two sides of the feeder line improve the axial ratio characteristic and increase the axial ratio bandwidth.
In this embodiment, the coplanar waveguide feeder 6 is a 50 Ω microstrip, so as to realize a feeding mode of the antenna coplanar waveguide, and the feeding mode has small dispersion, low radiation loss, and can reach millimeter wave frequency band at most.
In this embodiment, the copper sheet is not covered under the dielectric substrate 7.
Examples: as shown in fig. 1, the antenna comprises a quarter-circular monopole radiating patch 1, a bent microstrip branch node line 2, a circular patch 3 and a pair of asymmetric coplanar waveguide ground planes, wherein the antenna adopts a coplanar waveguide feed mode, and is powered by a 50 Ω microstrip strip with a width of W f as a coplanar waveguide feed line 6. The main radiating element of the antenna is a quarter-circular microstrip monopole patch providing a vertically oriented but electromagnetic component. The pair of asymmetric coplanar waveguide ground planes are positioned at two sides of the feeder line, and the interval is g; the length of the left coplanar waveguide ground plane 4 is m and the width is n; the length p of the right coplanar waveguide ground plane 5 is q, and the current directions on the left coplanar waveguide ground plane 4 and the right coplanar waveguide ground plane 5 are different by 90 degrees; the bent microstrip branch node line 2 is arranged at the upper left part of the monopole radiation patch 1 and is flush with the upper part of the monopole radiation patch 1; the circular patch 3 is coupled in the upper right side of the monopole radiating patch 1 by a slot of width W slot. The current flow direction of the quarter-round monopole radiating patch 1 is kept basically in the vertical direction, and the bent microstrip branch node line 2 loaded on the left side of the quarter-round monopole patch 1 provides a horizontal current path; the difference in structure of the ground planes at both sides of the feeder line causes a strong current to flow in the vertical direction at the ground plane at the left side of the feeder line, and the current to flow at the ground plane at the right side of the feeder line is concentrated in the horizontal direction, and electromagnetic waves excited by the currents in the horizontal and vertical directions can be combined into circularly polarized waves in the far field region.
The reflection coefficient measured by the antenna is shown in figure 2, the frequency range of which the reflection coefficient is smaller than-10 dB is 6.05 GHz-13.62 GHz, and the impedance bandwidth reaches 7.57GHz (relative bandwidth 76.9%).
The axial ratio curve measured by the antenna can be seen in fig. 3, and the bandwidth range of the measured AR smaller than 3dB is between 5.8GHz and 9.06 GHz. The axial ratio bandwidth of the overlapping part of the impedance bandwidth and the impedance bandwidth is 3.01GHz (6.05 GHz-9.06 GHz, and the relative bandwidth is 39.8%).
Fig. 4 shows radiation patterns of xoz and yoz planes of far-field radiation at different frequencies of operation frequencies 6.05 GHz, 7.5 GHz and 9 GHz, respectively, the radiation patterns being omnidirectional radiation.
The peak gain measured by the antenna is shown in fig. 5. It can be seen that the measured gain is between 0.46 and 3.28dBi at a 3-dB axial ratio bandwidth of 6.05 to 9.06 GHz.
The invention has the advantages that: CPW feeding is adopted through a 50 omega microstrip strip positioned between the ground planes, and the feeding form has small dispersion and low radiation loss and can reach millimeter wave frequency bands. The main radiation patch is a quarter-round microstrip monopole, and the structure is easy to realize ultra-wideband circular polarization. The bent microstrip stub is used to widen the impedance bandwidth and generate a horizontal component of electromagnetic waves. The structure of the asymmetric ground plane and the coupled circular patch can simultaneously obtain a wide impedance bandwidth and a wide Axial Ratio (AR) bandwidth. A circular patch is coupled to the monopole radiating patch to introduce a perturbation, and the energy of the circular patch is provided by the monopole radiating patch through the coupling slot, increasing the axial ratio bandwidth. The invention has simple structure, compact antenna size, larger axial ratio bandwidth, simple feed structure and very wide application prospect.
If the invention discloses or relates to components or structures fixedly connected with each other, then unless otherwise stated, the fixed connection is understood as: detachably fixed connection (e.g. using bolts or screws) can also be understood as: the non-detachable fixed connection (e.g. riveting, welding), of course, the mutual fixed connection may also be replaced by an integral structure (e.g. integrally formed using a casting process) (except for obviously being unable to use an integral forming process).
In addition, terms used in any of the above-described aspects of the present disclosure to express positional relationship or shape have meanings including a state or shape similar to, similar to or approaching thereto unless otherwise stated.
Any part provided by the invention can be assembled by a plurality of independent components, or can be manufactured by an integral forming process.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same; while the invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present invention or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the invention, it is intended to cover the scope of the invention as claimed.
Claims (2)
1. A planar ultra-wideband circularly polarized antenna is characterized in that: the monopole radiating patch is connected with the coplanar waveguide feeder and is arranged above the dielectric substrate, and the bent microstrip branch node line is connected with the left side of the monopole radiating patch; the circular patch is coupled to the right side of the monopole radiating patch; the pair of asymmetric coplanar waveguide grounding surfaces are respectively arranged at the left side and the right side of the coplanar waveguide feeder;
the bent microstrip branch node line is arranged at the upper left part of the monopole radiation patch and is flush with the upper part of the monopole radiation patch;
the circular patch is coupled at the upper right side of the monopole radiation patch through a coupling gap;
The pair of asymmetric coplanar waveguide ground planes comprises a left coplanar waveguide ground plane and a right coplanar waveguide ground plane, and the lengths and widths of the left coplanar waveguide ground plane and the right coplanar waveguide ground plane are different, so that the current directions of the left coplanar waveguide ground plane and the right coplanar waveguide ground plane are different by 90 degrees.
2. A planar ultra wideband circularly polarized antenna as claimed in claim 1, wherein: the copper sheet is not covered below the dielectric substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210604586.7A CN114865298B (en) | 2022-05-31 | Planar ultra-wideband circularly polarized antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210604586.7A CN114865298B (en) | 2022-05-31 | Planar ultra-wideband circularly polarized antenna |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114865298A CN114865298A (en) | 2022-08-05 |
| CN114865298B true CN114865298B (en) | 2024-06-07 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109687126A (en) * | 2018-12-13 | 2019-04-26 | 东华大学 | A kind of circular polarization microstrip antenna of quasi- c-type structure |
| CN110112558A (en) * | 2019-06-03 | 2019-08-09 | 安徽大学 | A kind of four frequency range monopole antenna of compact based on coplanar wave guide feedback |
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109687126A (en) * | 2018-12-13 | 2019-04-26 | 东华大学 | A kind of circular polarization microstrip antenna of quasi- c-type structure |
| CN110112558A (en) * | 2019-06-03 | 2019-08-09 | 安徽大学 | A kind of four frequency range monopole antenna of compact based on coplanar wave guide feedback |
Non-Patent Citations (1)
| Title |
|---|
| Asymmetric CPW-fed Wideband Circularly Polarized Antenna for Sub-6 GHz Application;Bosong Qiu等;2020 IEEE 3rd International Conference on Electronic Information and Communication Technology;第Ⅱ节 * |
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