CN115207635A - All-metal filtering circularly polarized antenna based on EBG structure - Google Patents
All-metal filtering circularly polarized antenna based on EBG structure Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/0428—Substantially flat resonant element parallel to ground plane, e.g. patch antenna radiating a circular polarised wave
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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
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- 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
- H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/14—Reflecting surfaces; Equivalent structures
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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
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
- H01Q3/28—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture varying the amplitude
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
- H01Q3/30—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture varying the relative phase between the radiating elements of an array
- H01Q3/34—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture varying the relative phase between the radiating elements of an array by electrical means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/045—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means
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Abstract
The invention discloses an all-metal filtering circularly polarized antenna based on an EBG (electromagnetic band gap) structure, which comprises a reflecting plate, a plurality of metal patches and an EBG (electromagnetic band gap) structure, wherein the plurality of metal patches surround a field-shaped structure, each gap of the field-shaped structure is loaded with the EBG structure, the EBG structure is respectively connected with the metal patches and the reflecting plate through a feed structure, and the EBG structure is spatially positioned between the metal patches and the reflecting plate; the invention has the advantages that: the anti-interference capability is strong.
Description
Technical Field
The invention relates to the technical field of antennas of wireless communication systems, in particular to an EBG structure-based all-metal filtering circularly polarized antenna.
Background
With the development of satellite communication and remote control and telemetry technologies, antennas with single polarization mode have been far from meeting the requirements of tracking and measuring targets under various climatic conditions. Compared with a linear polarization antenna, the circularly polarized antenna can eliminate the polarization distortion influence caused by the ionosphere Faraday rotation effect in satellite communication, remote measurement and remote sensing equipment; the signal loss can be reduced; in electronic countermeasures, various linearly polarized and elliptically polarized signals of enemies can be detected and interfered; signals on the carrier that are strongly wiggling or rolling can be received. Due to numerous advantages, circularly polarized antennas are widely used in the field of wireless communications.
The all-metal material is high-power-resistant and high-temperature-resistant, can enhance the physical strength of the whole antenna, is more durable in service time under severe conditions, and can improve the strength of a reflected signal. On one hand, materials are saved on the basis of ensuring the necessary supporting strength of the structure, and the performance is improved; on the other hand, the complexity of antenna processing is reduced by adopting a single processing material.
The EBG structure is a periodic band gap suppression structure, and the suppression frequency band can be adjusted by the number of periods and a unit structure, and thus the EBG structure is widely used in many fields such as microwave circuits, antennas, and optical devices. Which has a band gap characteristic and an in-phase reflection characteristic. The band gap characteristic is utilized to restrain the surface wave, so that the antenna gain can be improved; the low-profile antenna is designed by utilizing the in-phase reflection characteristic, so that the height of the antenna can be reduced; in the design process of the array antenna, the use of the EBG structure can reduce the mutual coupling among the array units and eliminate the scanning blind area of the array antenna; the defective pattern of the EBG structure can also be used to design a high directivity antenna.
The Chinese patent application number 201610536573.5 discloses a low-profile ultra-wideband circularly polarized antenna based on an EBG structure, which is used for solving the technical problem that the working frequency band of the existing low-profile broadband circularly polarized antenna based on the EBG structure is relatively narrow, and comprises the EBG structure (1), a crossed dipole antenna (2) and a power division phase shifter (3), wherein a feed unit of the crossed dipole antenna (2) adopts an inverted-L-shaped coupling feed mode, and is vertically inserted into the EBG structure; the power division phase shifter (3) comprises a Wilkinson power divider and a 90-degree phase shifter, and the power division phase shifter (3) is grounded with the EBG structure (1) and is connected with a feeder line of the feed unit; the cross section of the patent application is low, and the working frequency bandwidth is wide, can be used to radio frequency identification, radar and radio communication and circle polarization electromagnetic wave's receipt and transmission in the broadband. However, the problem of antenna anti-interference is not considered, the antenna anti-interference is particularly important in the field of aviation, and the antenna is difficult to put into practical application if the anti-interference capability is weak.
Disclosure of Invention
The technical problem to be solved by the invention is that the full-metal filtering circularly polarized antenna based on the EBG structure has weak anti-interference capability.
The invention solves the technical problems through the following technical means: the utility model provides an all-metal filtering circular polarization antenna based on EBG structure, includes reflecting plate, a plurality of metal paster and EBG structure, a plurality of metal pasters enclose into field font structure, every space department of field font structure all loads an EBG structure, the EBG structure is connected with metal paster and reflecting plate respectively through the feed structure, the EBG structure is located between metal paster and the reflecting plate in the space.
According to the antenna, the plurality of metal patches are enclosed to form a field-shaped structure, each gap of the field-shaped structure is loaded with one EBG structure, the EBG structures are respectively connected with the metal patches and the reflecting plate through the feed structures, the whole antenna is designed to be field-shaped, and the EBG structures are loaded in each gap, so that the transmission of the surface wave of the antenna is effectively inhibited, and the anti-interference capability is strong.
Furthermore, the number of the metal patches is six, each metal patch is a rectangle with the same shape and size, three metal patches are arranged in parallel in three rows at equal intervals, the other three metal patches are arranged in parallel in three rows at equal intervals, and the whole metal patches surround a Chinese character 'tian' -shaped structure.
Further, a tip portion of a distal end of the metal patch is processed with a round chamfer.
Furthermore, a plurality of support columns are arranged between the Chinese character tian-shaped structure and the reflecting plate, one ends of the support columns are connected with the metal patches, and the other ends of the support columns are connected with the reflecting plate.
Furthermore, two feeding points are respectively and symmetrically arranged on the metal patches in the middle row and the metal patches in the middle column by taking the center of the field-shaped structure as the center, and the phase difference is respectively 0 degrees, 90 degrees, 180 degrees and 270 degrees.
And furthermore, a feed structure is vertically connected between each feed point and the reflecting plate, and an external electromagnetic wave input port is outwards extended from the position of the reflecting plate, which is positioned at the connection position of the feed structure and the reflecting plate.
Still further, the feed structure comprises an inner conductor and an outer conductor, the inner conductor and the outer conductor are coaxially nested, the inner conductor penetrates through the reflecting plate to be connected with the metal patch, and the outer conductor is connected with the external electromagnetic wave input port below the reflecting plate.
Furthermore, a layer of cylindrical cavity structure is arranged outside the inner conductor, the bottom of the cylindrical cavity structure is connected with the reflecting plate, a layer of cylindrical fixing piece is additionally arranged outside the cylindrical cavity structure, the length of the cylindrical fixing piece is smaller than that of the cylindrical cavity structure, and the top of the cylindrical fixing piece is connected with the metal patch.
Further, the EBG structure includes radiation paster, reflection cup, medium post and cylinder base, the reflection cup is cylinder metal thin-walled structure, and the radiation paster is discoid, the cylinder base is cylindrical hollow cavity, and the radiation paster is coaxial and is located the reflection cup top with the reflection cup, and the reflection cup is fixed in the cylinder base top, and the radiation paster passes through medium post and cylinder base upper surface fixed connection, cylinder base bottom fixed connection is on the reflecting plate.
Still further, the total height of the circularly polarized antenna is not more than 0.11 lambda, wherein lambda is the wavelength of the electromagnetic wave with the central frequency propagating in the free space.
The invention has the advantages that:
(1) According to the invention, the plurality of metal patches are enclosed into a field-shaped structure, each gap of the field-shaped structure is loaded with one EBG structure, the EBG structures are respectively connected with the metal patches and the reflecting plate through the feed structures, the antenna is integrally designed into a field shape, and the EBG structures are loaded in each gap, so that the transmission of the surface wave of the antenna is effectively inhibited, and the anti-interference capability is strong.
(2) The tip part at the tail end of the metal patch is processed by the round cutting angle, so that the discharge phenomenon of the tip part of the metal patch antenna can be prevented, and the metal patch antenna is safe, reliable and strong in anti-interference capability.
(3) The feeding structure is vertically connected between each feeding point and the reflecting plate, and the coaxial feeder is used for vertical feeding, the feeding method is to complete feeding by a single coaxial feeding probe (an inner conductor and an outer conductor) vertical to the ground, so that a feeding network is avoided being designed below the antenna, the metal ratio of the antenna has certain flexibility, and the feeding structure also plays a supporting role.
(4) According to the invention, a layer of cylindrical cavity structure is arranged outside the inner conductor, the bottom of the cylindrical cavity structure is connected with the reflecting plate, a layer of cylindrical fixing piece is additionally arranged outside the cylindrical cavity structure, the length of the cylindrical fixing piece is smaller than that of the cylindrical cavity structure, and the cylindrical cavity structure and the cylindrical fixing piece play a role in stabilizing the whole antenna.
(5) The total height of the circularly polarized antenna does not exceed 0.11 lambda, the antenna has a low profile and a simple structure, and is suitable for field engineering application.
(6) Compared with the prior art (201610536573.5), the EBG structure is a layer of planar microstrip structure, and the EBG structure is a metal cylinder with a certain height to realize the EBG structure. Compared with the EBG structure in the form of a microstrip, the metal EBG structure has the advantages of small loss, good environmental adaptability and the like. The EBG structure of the invention is internally provided with an S-band antenna, which not only has the electrical property of the conventional EBG structure, but also is an independent S-band antenna, and a directional diagram is synthesized in space by controlling the amplitude and the phase of a feed port. The EBG structure has an antenna function in an S wave band, and has the electrical property of the conventional EBG structure for a UHF antenna, namely, the section height of the UHF frequency band antenna is reduced.
The S-band antenna and the UHF-band antenna in the invention are designed with a common caliber, and the height of the conventional patch antenna is 1/10 of the working wavelength. Because the difference of the working frequencies of the antennas in the two frequency bands is larger, the height of the UHF frequency band antenna is far larger than that of the S-band antenna. The UHF antenna is shielded from the S-band antenna, and the influence of the UHF antenna on the radiation pattern of the S-band antenna is large. Therefore, the height of the S-band antenna is raised by using the metal cylindrical EBG structure, and the influence of the UHF-band antenna on an S-band antenna directional pattern is reduced. Meanwhile, the metal cylindrical EBG structure reduces the height of the UHF frequency band antenna. Further reducing the effect of the UHF antenna on the S antenna radiation pattern. Therefore, the metal cylindrical EBG structure has the double functions of improving the S-band antenna pattern and reducing the height of the UHF-band antenna.
Drawings
Fig. 1 is a top view of an overall structure of an EBG structure-based all-metal filtering circular polarization antenna according to an embodiment of the present invention;
fig. 2 is a front view of an overall structure of an EBG structure-based all-metal filtering circularly polarized antenna according to an embodiment of the present invention; fig. 2 (a) is a physical diagram provided for more clearly showing the structure, and fig. 2 (b) is a line diagram corresponding to fig. 2 (a);
fig. 3 is a three-dimensional view of an EBG structure in an all-metal filtering circular polarization antenna based on the EBG structure disclosed in the embodiment of the present invention; wherein, fig. 3 (a) is a three-dimensional solid diagram provided for more clearly showing the structure, and fig. 3 (b) is a line diagram of the EBG structure;
fig. 4 is a graph showing the result of the active standing-wave ratio of the all-metal filtering circularly polarized antenna based on the EBG structure according to the embodiment of the present invention;
fig. 5 is an axial ratio result diagram of an EBG structure-based all-metal filtering circularly polarized antenna disclosed in the embodiment of the present invention;
fig. 6 is a radiation pattern of a full-metal filtering circular polarized antenna based on an EBG structure at 235MHz according to an embodiment of the present invention;
fig. 7 is a radiation pattern of a full-metal filtering circular polarized antenna based on an EBG structure at 275MHz according to an embodiment of the present invention;
fig. 8 is a radiation pattern of an EBG structure-based all-metal filter circularly polarized antenna at 315MHz according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an all-metal filtering circular polarization antenna based on EBG structure, including reflecting plate 5, a plurality of metal patches 1 and EBG structure 2, a plurality of metal patches 1 enclose into field font structure, in this embodiment, metal patches 1 has six, and every metal patch 1 is the same rectangle of shape size, and three metal patches 1 equidistant is triplex row parallel arrangement and three other metal patches 1 equidistant triplex row parallel arrangement, wholly encloses into field font, has guaranteed the symmetry of antenna, is favorable to the radiation of electromagnetic field, and the metal material of metal patches 1 selects the aluminum alloy, and thickness is 1mm. Each gap of the field-shaped structure is loaded with an EBG structure 2, so that the propagation of surface waves is effectively inhibited, the EBG structure 2 is respectively connected with the metal patch 1 and the reflecting plate 5 through the feed structure, and the EBG structure 2 is spatially positioned between the metal patch 1 and the reflecting plate 5.
In order to prevent the discharge phenomenon from occurring at the tip portion of the metal patch 1, the tip portion is processed with a 3mm round chamfer.
As shown in fig. 2, in order to stabilize the structure, a plurality of support columns 4 are disposed between the grid-shaped structure and the reflective plate 5, one end of each support column 4 is connected to the metal patch 1, and the other end of each support column 4 is connected to the reflective plate 5. The support column 4 is made of polytetrafluoroethylene, and the radius of the medium support column 4 is 5mm, and the height is 115mm. In this embodiment, 4 support columns 4 are provided, and are respectively located at an intersection of the first row of metal patches 1 and the first column of metal patches 1, an intersection of the first row of metal patches 1 and the third column of metal patches 1, an intersection of the third row of metal patches 1 and the first column of metal patches 1, and an intersection of the third row of metal patches 1 and the third column of metal patches 1.
The field-shaped structure adopts a four-point feeding mode, and amplitudes at four feeding points 3 are equal. Specifically, two feed points 3 are respectively and symmetrically arranged on the metal patches 1 in the middle row and the metal patches 1 in the middle column by taking the center of the field-shaped structure as the center, and the total number of the feed points 3 is four, and the phase differences are respectively 0 °, 90 °, 180 ° and 270 °, so that the purpose of circularly polarizing the radiation of the antenna is achieved.
The feeding structure is perpendicularly connected between each feeding point 3 and the reflecting plate 5, the problem of connector installation is considered, an external electromagnetic wave input port 6 is outwards arranged at the position, located at the connecting position of the feeding structure and the reflecting plate 5, on the reflecting plate 5, the size of the external electromagnetic wave input port 6 is the same as that of a connector flange, installation is facilitated, and the connector is TNC-KFD48. The feed structure comprises an inner conductor and an outer conductor, wherein the inner conductor and the outer conductor are coaxially nested, the inner conductor penetrates through the reflecting plate 5 to be connected with the metal patch 1, and the outer conductor is connected with the external electromagnetic wave input port 6 below the reflecting plate 5. The coaxial feed technique achieves good impedance matching. The radius of inner conductor is 1.52mm, and the height is 123mm, and the radius of outer conductor is 5.016mm, and the height is 8mm. Electromagnetic waves enter from the external electromagnetic wave input port 6 and are output to the feeding point 3 through the inner conductor and the outer conductor.
In order to enable the antenna to be more stable when placed in a real object, a layer of cylindrical cavity structure 7 is arranged outside the inner conductor, the bottom of the cylindrical cavity structure 7 is connected with the reflecting plate 5, and the material of the cylindrical cavity structure 7 has the dielectric constant of 2.1, the radius of 4.3mm and the height of 115mm. Cylindrical cavity structure 7 still adds outward and establishes one deck cylinder mounting 8, 8 length of cylinder mounting are less than cylindrical cavity structure 7, the top and the metal patch 1 of cylinder mounting 8 are connected, and cylinder mounting 8 adopts full metal material, and radius 6mm, height 30mm.
As shown in fig. 3, the EBG structure 2 includes a radiation patch 201, a reflective cup 202, a dielectric column 204, and a cylindrical base 203, wherein the radiation patch 201 has a disc shape with a radius of 26mm and a height of 0.5mm. The cylindrical base 203 is a cylindrical hollow cavity, the radiation patch 201 is coaxial with the reflection cup 202 and is positioned above the reflection cup 202, the reflection cup 202 is a cylindrical metal thin-wall structure, unit isolation and antenna isolation are increased, the radius of an inner cavity is 34mm, the radius of an outer cavity is 35mm, and the wall thickness is 1mm. The reflector cup 202 is fixed above the cylindrical base 203, the radius of the inner and outer walls of the cylindrical base 203 is the same as the radius of the inner and outer walls of the reflector cup 202, and the height is 44mm. In order to support the radiation patch 201 and the reflection cup 202 between the air layers, holes are punched at three positions of the radiation patch 201, the radius of each hole is 2.5mm, a dielectric column 204 with the relative dielectric constant of 2.02 is adopted for supporting, the height of each hole is 22.7mm, the radiation patch 201 is fixedly connected with the upper surface of a cylindrical base 203 through the dielectric column 204, and the bottom of the cylindrical base 203 is fixedly connected to the reflection plate 5. The reflector cup 202 and the cylindrical base 203 are machined as an integral part, and the radiation patch 201 and the dielectric column 204 are connected through threads to realize structural assembly. The EBG structures 2 are compactly arranged according to 4 multiplied by 4, the current distribution of the antenna is changed, the propagation of surface waves is inhibited, and the gain of the antenna is improved.
The height of the reflecting plate 5 is 1mm, and the length and the width are 130mm. The height of the upper cylindrical base 203 is 44mm, and the height of the inner cavity of the cylindrical base 203 comprises 1mm of the thickness of the reflecting plate 5, namely the position of the cylindrical base 203 corresponding to the reflecting plate 5 is empty. The end of the cylindrical cavity structure 7 is respectively provided with a section of external thread for connecting the reflecting plate 5 and the metal patch 1.
As shown in the active standing wave ratio result and the axial ratio result of the antenna simulation, as can be seen from fig. 4 and 5, the active standing wave ratio of the antenna is less than 2.5 and the axial ratio is less than 0.3dB in the UHF frequency range of 235MHz-315MHz, so that the good circular polarization characteristic is realized.
As shown in FIGS. 6-8, the simulated radiation pattern of the antenna has a frequency f1 gain of 3.89dB, a frequency f2 gain of 4.96dB, and a frequency f3 gain of 5.71dB, which shows good radiation characteristics. f1, f2 and f3 are respectively a high frequency point, a middle frequency point and a low frequency point.
Therefore, by comprehensively considering various parameters, the usable working bandwidth of the all-metal filtering circularly polarized antenna based on the EBG structure is 235MHz-315MHz, the axial ratio is less than 1, the profile height is less than 115mm, that is, 0.11 λ, and λ is the wavelength of the electromagnetic wave with the center frequency propagating in the free space. Therefore, the invention achieves the design goals of low section, high gain, excellent axial ratio and directional diagram. The antenna has the advantages of common and cheap dielectric material, simple structure, convenient processing, and application in complex environment due to the adoption of all-metal material. In conclusion, the designed all-metal filtering circularly polarized antenna based on the EBG structure not only solves the problem that the traditional UHF antenna is only suitable for simple application environments, but also has the advantages of small size, simple structure, low cost and the like, thereby having wide application value and market potential.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The all-metal filtering circularly polarized antenna based on the EBG structure is characterized by comprising a reflecting plate, a plurality of metal patches and the EBG structure, wherein the metal patches surround a field-shaped structure, one EBG structure is loaded at each gap of the field-shaped structure, the EBG structure is respectively connected with the metal patches and the reflecting plate through a feed structure, and the EBG structure is spatially positioned between the metal patches and the reflecting plate.
2. The EBG structure-based all-metal filtering circularly polarized antenna according to claim 1, wherein the number of the metal patches is six, each metal patch is a rectangle with the same shape and size, three metal patches are arranged in parallel in three rows at equal intervals, the other three metal patches are arranged in parallel in three columns at equal intervals, and the whole antenna is shaped like a Chinese character 'tian'.
3. The all-metal filtering circular polarization antenna based on the EBG structure of claim 2, wherein the tip portion of the end of the metal patch is processed by a circular cutting angle.
4. The EBG structure-based all-metal filtering circularly polarized antenna according to claim 2, wherein a plurality of support columns are arranged between the field-shaped structure and the reflector plate, one ends of the support columns are connected with the metal patch, and the other ends of the support columns are connected with the reflector plate.
5. The EBG-based all-metal filtering circularly polarized antenna according to claim 2, wherein the metal patches in the middle row and the metal patches in the middle column are symmetrically provided with two feeding points respectively centered on the center of the Chinese character tian-shaped structure, and the phase difference is respectively 0 °, 90 °, 180 ° and 270 °.
6. The EBG structure-based all-metal filtering circularly polarized antenna is characterized in that a feeding structure is vertically connected between each feeding point and the reflecting plate, and an external electromagnetic wave input port is extended outwards from the position, located at the connection position of the feeding structure and the reflecting plate, on the reflecting plate.
7. The EBG structure-based all-metal filtering circularly polarized antenna according to claim 6, wherein the feed structure comprises an inner conductor and an outer conductor, the inner conductor and the outer conductor are coaxially nested, the inner conductor passes through the reflector plate and is connected with the metal patch, and the outer conductor is connected with the external electromagnetic wave input port below the reflector plate.
8. The EBG structure-based all-metal filtering circularly polarized antenna according to claim 7, wherein a cylindrical cavity structure is arranged outside the inner conductor, the bottom of the cylindrical cavity structure is connected with the reflector, a cylindrical fixing member is additionally arranged outside the cylindrical cavity structure, the length of the cylindrical fixing member is smaller than that of the cylindrical cavity structure, and the top of the cylindrical fixing member is connected with the metal patch.
9. The EBG structure-based all-metal filtering circularly polarized antenna according to claim 5, wherein the EBG structure comprises a radiation patch, a reflection cup, a dielectric pillar and a cylindrical base, the reflection cup is a cylindrical metal thin-wall structure, the radiation patch is a disk shape, the cylindrical base is a cylindrical hollow cavity, the radiation patch is coaxial with the reflection cup and is located above the reflection cup, the reflection cup is fixed above the cylindrical base, the radiation patch is fixedly connected with the upper surface of the cylindrical base through the dielectric pillar, and the bottom of the cylindrical base is fixedly connected to the reflection plate.
10. The all-metal filtering circular polarization antenna based on the EBG structure as claimed in claim 1, wherein the total height of the circular polarization antenna is not more than 0.11 λ, λ is the wavelength of the central frequency electromagnetic wave propagating in the free space.
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| CA2505433A1 (en) * | 2004-04-27 | 2005-10-27 | Intelwaves Technologies Ltd. | Low profile hybrid phased array antenna system configuration and element |
| KR20120001994A (en) * | 2010-06-30 | 2012-01-05 | 광주과학기술원 | Planar antenna integrated with 1-d ebg ground plane |
| CN107331958A (en) * | 2017-08-11 | 2017-11-07 | 深圳山脊技术有限公司 | A kind of circular polarisation filter antenna |
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2022
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|---|---|---|---|---|
| CA2505433A1 (en) * | 2004-04-27 | 2005-10-27 | Intelwaves Technologies Ltd. | Low profile hybrid phased array antenna system configuration and element |
| KR20120001994A (en) * | 2010-06-30 | 2012-01-05 | 광주과학기술원 | Planar antenna integrated with 1-d ebg ground plane |
| CN107331958A (en) * | 2017-08-11 | 2017-11-07 | 深圳山脊技术有限公司 | A kind of circular polarisation filter antenna |
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