CN116417783A - Broadband end-fire circularly polarized antenna and array based on low-profile feed structure - Google Patents
Broadband end-fire circularly polarized antenna and array based on low-profile feed structure Download PDFInfo
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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
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- H01Q21/00—Antenna arrays or systems
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- H—ELECTRICITY
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- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
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- 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
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- 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
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- H—ELECTRICITY
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- 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
- H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
- H01Q9/18—Vertical disposition of the antenna
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Abstract
The invention discloses a broadband end-fire circularly polarized antenna and an array based on a low-profile feed structure, wherein the antenna comprises a top metal radiating block, a top metal layer, a dielectric layer, a bottom metal layer and a bottom metal radiating block which are arranged from top to bottom; the metal layer is provided with a horizontal polarization dipole radiation unit, and the two metal radiation blocks jointly form a vertical polarization gradual change groove radiation unit. The broadband circularly polarized antenna is realized by adjusting the amplitude and phase relation between the two units. The parasitic guide oscillator is introduced into the antenna, so that gain attenuation of the dipole radiating unit in a high frequency band can be effectively compensated, and the axial ratio bandwidth of the antenna unit is greatly widened. The antenna is fed through the low-profile substrate integrated waveguide, can be conveniently expanded into an antenna array, and is easy to integrate with a front-end active circuit. The antenna array provided by the invention has the advantages that the broadband end-fire circular polarization characteristic is ensured, meanwhile, the antenna array also has a low-profile feed structure, can be conveniently integrated with a front-end active circuit plane, and is an excellent choice for millimeter wave communication.
Description
Technical Field
The invention belongs to the field of microwave and millimeter waves, and particularly relates to a broadband end-fire circularly polarized antenna and an array based on a low-profile structure.
Background
Due to the advantages of large bandwidth and high data transmission rate, millimeter wave technology related applications have become research hotspots for communication and radar technology in recent years, such as fifth-generation mobile communication, automotive radar, satellite communication, and the like. In these applications, alignment errors between millimeter wave receivers and transmitters are difficult to avoid. If a linearly polarized antenna is used as the transmitting/receiving antenna, the polarization mismatch between the transmitting/receiving antennas will be deteriorated. Circular polarized antennas have been widely used to solve the above problems due to their low sensitivity to antenna azimuth and attitude due to multipath fading. Circular polarized antennas can be classified into side-firing and end-firing based on the maximum radiation direction of the antenna. The maximum radiation direction of the end-fire circular polarized antenna is parallel to the array axis, so that the end-fire circular polarized antenna is more suitable for certain handheld low-profile millimeter wave equipment application scenes.
In recent years, the related research of broadband millimeter wave end-fire circularly polarized antennas is widely focused by students at home and abroad, and related research reports are also available. However, it is difficult to combine the broadband and easy planar integration characteristics of the end-fire circularly polarized antenna reported so far. At present, two main schemes are adopted for realizing the broadband end-fire circular polarization antenna, and the first scheme adopts a metal waveguide technology to realize the broadband end-fire circular polarization, however, the broadband end-fire circular polarization antenna has the advantages of heavy structure, high antenna section, high processing cost and difficulty in integration with a planar circuit. The second scheme is that a complementary source structure is adopted, two orthogonal polarization radiating units are respectively arranged on a planar circuit board, and broadband end-fire circular polarization is realized by adjusting the amplitude and phase relation between two orthogonal polarization electric field components. This solution usually uses the opening SIW as a vertically polarized radiating element, and the antenna feed structure is very high in cross section in order to generate two orthogonal polarized components of similar amplitude. If such a thick dielectric is used, the corresponding 50 Ω microstrip line width will exceed 4mm. However, the chip pin distance of the front-end active circuit is smaller (about 0.5 mm), which makes the impedance matching transition structure between the chip pin and the 50 Ω microstrip line difficult to design and has large insertion loss, so that the antenna and the radio-frequency front-end active circuit are difficult to integrate in a plane.
Disclosure of Invention
The invention aims to provide a broadband end-fire circularly polarized antenna and an array based on a low-profile feed structure. The cross section of the antenna feed structure is reduced while broadband end-fire circularly polarized radiation can be realized, so that the whole antenna array is easy to integrate with a front-end active circuit plane.
The technical solution for realizing the purpose of the invention is as follows: a broadband end-fire circularly polarized antenna based on a low-profile feed structure comprises a top metal radiating block, a top metal layer, a dielectric layer, a bottom metal layer and a bottom metal radiating block which are sequentially arranged from top to bottom; the top metal layer and the bottom metal layer are provided with dipole radiating units with guide vibrators; the top metal radiating block and the bottom metal radiating block jointly form a linear gradual change groove radiating unit; the dipole radiation unit generates a horizontal polarized electric field component, the linear gradual change groove radiation unit generates a vertical polarized electric field component, and broadband circular polarized radiation is realized by adjusting the amplitude correlation between two orthogonal polarized electric field components.
Further, the top metal layer and the bottom metal layer are symmetrically arranged parallel to the dielectric layer;
the top metal layer comprises a first rectangular metal sheet, a first L-shaped metal sheet and a first guiding oscillator for compensating gain loss of a dipole unit at a high frequency, wherein the first L-shaped metal sheet is arranged at the long side of the first rectangular metal sheet and comprises a first metal arm and a second metal arm, the first metal arm is connected with the long side of the first rectangular metal sheet and is perpendicular to the long side of the first rectangular metal sheet, the second metal arm is used as a radiation side, and the first guiding oscillator is arranged at the other side of the first L-shaped metal sheet relative to the first rectangular metal sheet and is parallel to the second metal arm with a certain distance;
the bottom metal layer comprises a second rectangular metal sheet, a second L-shaped metal sheet and a second guiding oscillator for compensating gain loss of the dipole unit at a high frequency, wherein the second L-shaped metal sheet is arranged at the long side of the second rectangular metal sheet and comprises a third metal arm and a fourth metal arm, the third metal arm is connected with the long side of the second rectangular metal sheet and is perpendicular to the long side of the second rectangular metal sheet, the fourth metal arm is used as a radiation side, and the second guiding oscillator is arranged at the other side of the second L-shaped metal sheet relative to the second rectangular metal sheet and is parallel to the fourth metal arm with a certain distance;
the two radiating edges form a dipole radiating element;
the opening directions of the first L-shaped metal sheet and the second L-shaped metal sheet are opposite, namely the radiation edges of the first L-shaped metal sheet and the second L-shaped metal sheet are opposite in direction.
Further, the central axis of the long side of the first rectangular metal sheet, the central axis of the first metal arm and the central axis of the first guiding vibrator are coaxially arranged, and the central axis of the long side of the second rectangular metal sheet, the central axis of the third metal arm and the central axis of the second guiding vibrator are coaxially arranged.
Further, the dipole radiating element and the linear graded slot radiating element are fed together by a low-profile substrate integrated waveguide SIW, which is composed of a first rectangular metal sheet, a second rectangular metal sheet, a metal through hole between the two rectangular metal sheets, and a SIW port.
Further, the low-profile substrate integrated waveguide SIW has a profile height of only 0.056λ 0 ，λ 0 The air wavelength is the center frequency point of the working frequency band.
Further, the top metal radiating block and the bottom metal radiating block are of wedge-shaped structures.
Antenna array of broadband end-fire circularly polarized antenna based on low-profile feed structure, said antenna array comprising 2 N The broadband end-fire circularly polarized antenna unit adopts 1 to 2 minutes N Low profile SIW equal power divider pair 2 N Width of each2 with end-fire circular polarization antenna unit for feeding and SIW equal power distributor N Multiple output ports and 2 N The input ports of the broadband end-fire circularly polarized antenna units are connected.
Further, each end-fire circularly polarized antenna unit input port of the antenna array is provided with a first-order inductive window, and impedance matching of the whole antenna array is adjusted.
Further, the array antenna structure is scalable to 1×2 N ，N≥2。
Compared with the prior art, the invention has the remarkable advantages that:
1) Existing end-fire circular polarization solutions typically use a magnetic dipole formed by an opening SIW as a vertically polarized radiating element. The cross section of the antenna feed structure is high in order to produce two orthogonal polarization components of similar amplitude. Unlike conventional split SIW radiation schemes as the vertical polarization component, the linear graded slot radiating element of the present invention can be excited by a low profile SIW and generate a vertical polarization electric field component having an electric field amplitude similar to that of a dipole radiating element, thereby realizing broadband circular polarization radiation under a low profile feed structure.
2) The feed section of the end-fire circular polarized antenna array provided by the invention is only 0.056lambda 0 (λ 0 Air wavelength of a central frequency point of a working frequency band) is easy to carry out plane integration with a front-end active circuit.
3) The front of the dipole unit is provided with a guide oscillator which is used for compensating the gain loss of the dipole unit at high frequency, thereby further widening the 3dB axial ratio bandwidth of the end-fire circularly polarized antenna.
4) The end-fire circular polarization antenna array provided by the invention realizes 42.1% of impedance bandwidth and 35.8% of 3dB axial ratio bandwidth, has a low-profile feed structure, is easy to integrate with a front-end active circuit plane, and is an excellent choice for millimeter wave communication.
The invention is described in further detail below with reference to the accompanying drawings.
Drawings
Fig. 1 is a block diagram of a conventional dipole antenna element.
Fig. 2 is a schematic diagram of the ratio of the thickness of the feed section of a conventional dipole antenna to the amplitude of the electric field corresponding to two orthogonal polarizations.
Fig. 3 is a diagram of a broadband end-fire circularly polarized antenna unit according to the present invention.
Fig. 4 is a graph showing changes in horizontal polarization gain (GainY) and far field electric field amplitude difference (|db (Ex) -dB (Ey) |) before and after introduction of a director, for a broadband end-fire circularly polarized antenna according to the present invention.
Fig. 5 is a graph showing changes in the axial ratio of the broadband end-fire circularly polarized antenna according to the present invention before and after introduction of the director.
Fig. 6 is a top view of a dipole radiating element structure according to the present invention.
Fig. 7 is a graph of simulated |s11| and simulated circular polarization gain for a wideband end-fire circularly polarized antenna element according to the present invention.
Fig. 8 is a schematic diagram of a broadband end-fire circularly polarized antenna array according to the present invention.
Fig. 9 is a graph of actual measurement and simulation |s11| of a broadband end-fire circularly polarized antenna array according to the present invention.
Fig. 10 is a radiation pattern (35 g, xoz plane) of a broadband end-fire circularly polarized antenna array according to the present invention.
Fig. 11 is a radiation pattern (35 g, yoz plane) of a broadband end-fire circularly polarized antenna array according to the present invention.
Fig. 12 is a graph of gain and axial ratio for a broadband end-fire circularly polarized antenna array in accordance with the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present invention, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
Fig. 1 is a diagram of a conventional printed dipole radiating element, and an existing end-fire circular polarization antenna technical scheme adopts a complementary source scheme to realize end-fire circular polarization. The scheme uses a magnetic dipole formed by an open Substrate Integrated Waveguide (SIW) in fig. 1 as a vertical polarized radiation unit, and a printed dipole as a horizontal polarized radiation unit. By adjusting the amplitude and phase relation between the two, the end-fire circular polarization is realized. To achieve a more ideal circularly polarized radiation, the amplitude difference between the two orthogonal polarizations needs to be as small as possible (|db (Ex) -dB (Ey) | <2-3 dB). As shown in fig. 2, a thicker dielectric profile (> 1.5 mm) is often required to make the opening SIW electric field radiation intensity (dB (Ex)) comparable to the dipole (dB (Ey)). If such a thick dielectric is used, the corresponding 50 Ω microstrip line width will exceed 4mm. However, the chip pin distance of the front-end active circuit is smaller (about 0.5 mm), which makes the impedance matching transition structure between the chip pin and the 50 Ω microstrip line difficult to design and has large insertion loss, so that the antenna and the radio-frequency front-end active circuit are difficult to integrate in a plane.
In order to solve the above problems, the present invention provides a wideband end-fire circular polarization antenna unit and array based on a low-profile feed structure, which can realize wideband end-fire circular polarization performance and is easy to integrate with a front-end active circuit plane, and the specific structure of the antenna unit is shown in fig. 3. The antenna unit comprises from top to bottomThe top metal radiating block 1, the top metal layer 2, the dielectric layer 3, the bottom metal layer 4 and the bottom metal radiating block 5 are sequentially arranged below; the top metal layer 2 and the bottom metal layer 4 are provided with dipole radiation units 6 with guide vibrators 7; the top metal radiating block 1 and the bottom metal radiating block 5 jointly form a linear gradual change groove radiating unit. The dipole radiating units 6 are arranged along the horizontal direction (parallel to the dielectric layer 3), and two metal radiating edges of the dipole radiating units 6 are respectively distributed on the top metal layer 2 and the bottom metal layer 4 and are opposite in direction. The linear graded slot radiating units are arranged in a vertical direction (perpendicular to the dielectric layer 3). The central lines of the dipole radiating element 6 and the linear gradual groove radiating element are mutually overlapped. The dipole radiating element 6 and the linear tapered slot radiating element are both fed by a low profile Substrate Integrated Waveguide (SIW), the profile height being only 0.056λ 0 (λ 0 Air wavelength of the center frequency point of the working frequency band), so that planar integration with the front-end active circuit is easy. The dipole radiating element 6 generates a horizontal polarized electric field component, and the linear gradient slot radiating element formed by the top metal radiating block 1 and the bottom metal radiating block 5 together generates a vertical polarized electric field component. Broadband circularly polarized radiation is realized by adjusting the amplitude correlation between the two orthogonal polarized electric field components.
Unlike conventional split SIW radiation schemes as the vertical polarization component, the linear graded slot radiation unit employed in the present invention can be excited by a low-profile SIW and generate a vertical polarization electric field component having an electric field amplitude similar to that of the dipole radiation unit 6, thereby realizing broadband circular polarization radiation under a low-profile feed structure.
As shown in fig. 4 and 5, a parasitic director 7 is provided in front of the dipole element 6 to compensate for the loss of the dipole element gain at high frequencies. As shown in fig. 4, without parasitic director element 7, the horizontal polarization gain (GainY) of the dipole radiating element begins to drop at high frequencies (> 33 GHz). This makes the two orthogonal polarization amplitude balance ranges (|db (Ex) -dB (Ey) | <2 dB) narrow, thereby greatly limiting the 3dB axial ratio bandwidth of the circularly polarized antenna element. The parasitic guiding vibrator 7 can effectively compensate the high-frequency gain attenuation of the dipole radiating unit, and greatly widens the quadrature polarization amplitude balance range (|dB (Ex) -dB (Ey) | <2 dB). As shown in fig. 5, the introduction of the parasitic director element 7 can greatly expand the 3dB axial ratio bandwidth of the circularly polarized antenna unit, and the 3dB axial ratio relative bandwidth is improved from 21% to 40.9%.
In order to verify the authenticity and reliability of the broadband end-fire type circularly polarized antenna, a circularly polarized antenna unit full-wave model working in Ka-wave band is designed, and optimized simulation design is carried out. Fig. 6 shows a top view of a dipole radiating element in a circularly polarized antenna element, and ideal design results are obtained by performing full-wave optimization simulation on relevant parameters of a dipole 6 and a parasitic element 7. Fig. 5 and 7 show the simulation results related to the broadband end-fire circularly polarized antenna unit, wherein the bandwidth of the |s11| < 10dB impedance is 46.2% (26.6-42.6 GHz), and the bandwidth of the 3dB axial ratio is 40.9% (26.8-40.6 GHz).
In addition, the broadband end-fire circularly polarized antenna unit provided by the invention can be conveniently expanded to 1 multiplied by 2 N The circular polarization antenna array with N more than or equal to 2 comprises the following specific steps:
the antenna array adopts 1-2 minutes N Low profile SIW equal power divider 8 vs 2 N And feeding the broadband end-fire circularly polarized antenna units. 2 of SIW equal power divider 8 N Multiple output ports and 2 N The input ports of the broadband end-fire circularly polarized antenna units are connected. Each end-fire circularly polarized antenna element input port is provided with a first order inductive window 9 for adjusting the impedance matching of the overall antenna array. According to the antenna array assembling method, the invention makes a 1×8 low-profile feed structure circularly polarized antenna array for verification, and the specific structure is shown in fig. 8. The antenna array is processed by adopting Tacouc TLY-5 with single-layer thickness of 0.508mm, and the input ports of 8 end-fire antenna units are connected with 8 output ports of a 1-minute 8SIW equal power distributor. Fig. 9 to 12 show simulation and actual measurement of the circular polarized antenna array |s11|, the antenna radiation pattern, the circular polarization gain, and the axial ratio. The consistency between the simulation and the actual measurement results is good, so that the correctness and the reliability of the antenna provided by the invention are verified. The actual measurement result shows that the I S11I of the circularly polarized antenna array<-10dB impedance bandwidth 42.1% (27.45-42.1 GHz), 3dB axial ratio bandwidth 35.8% (27.5-39.5 GHz). Meanwhile, the antenna provided by the invention is fed by low SIW, and the section height is only 0.056lambda 0 (λ 0 Air wavelength of a central frequency point of a working frequency band), and is easy to carry out plane integration with a front-end active circuit.
In summary, the end-fire type circularly polarized antenna and the array provided by the invention not only can realize broadband circularly polarized radiation, but also have a low-profile feed structure (0.508 mm-0.056λ) 0 ) Is easy to integrate with the front-end active circuit plane.
The foregoing has outlined and described the basic principles, features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims.
Claims (9)
1. The broadband end-fire circularly polarized antenna based on the low-profile feed structure is characterized by comprising a top metal radiating block (1), a top metal layer (2), a dielectric layer (3), a bottom metal layer (4) and a bottom metal radiating block (5) which are sequentially arranged from top to bottom; the top metal layer (2) and the bottom metal layer (4) are provided with dipole radiating units (6) with guide vibrators (7); the top metal radiating block (1) and the bottom metal radiating block (5) jointly form a linear gradual change groove radiating unit; the dipole radiation unit (6) generates a horizontal polarized electric field component, the linear gradual change groove radiation unit generates a vertical polarized electric field component, and broadband circular polarized radiation is realized by adjusting the amplitude correlation between two orthogonal polarized electric field components.
2. Broadband end-fire circularly polarized antenna based on low profile feed structure according to claim 1, characterized in that the top metal layer (2), bottom metal layer (4) are symmetrically arranged parallel to the dielectric layer (3);
the top metal layer (2) comprises a first rectangular metal sheet, a first L-shaped metal sheet and a first guiding oscillator for compensating gain loss of a dipole unit at a high frequency, wherein the first L-shaped metal sheet is arranged at the long side of the first rectangular metal sheet and comprises a first metal arm and a second metal arm, the first metal arm is connected with the long side of the first rectangular metal sheet and is perpendicular to the long side of the first rectangular metal sheet, the second metal arm is used as a radiation side, and the first guiding oscillator is arranged at the other side of the first L-shaped metal sheet relative to the first rectangular metal sheet and is parallel to the second metal arm with a certain distance;
the bottom metal layer (4) comprises a second rectangular metal sheet, a second L-shaped metal sheet and a second guiding oscillator for compensating gain loss of the dipole unit at a high frequency, wherein the second L-shaped metal sheet is arranged at the long side of the second rectangular metal sheet and comprises a third metal arm and a fourth metal arm, the third metal arm is connected with the long side of the second rectangular metal sheet and is perpendicular to the long side of the second rectangular metal sheet, the fourth metal arm is used as a radiation side, and the second guiding oscillator is arranged at the other side of the second L-shaped metal sheet relative to the second rectangular metal sheet and is parallel to the fourth metal arm with a certain distance;
two of the radiating edges form a dipole radiating element (6);
the opening directions of the first L-shaped metal sheet and the second L-shaped metal sheet are opposite, namely the radiation edges of the first L-shaped metal sheet and the second L-shaped metal sheet are opposite in direction.
3. The broadband end-fire circularly polarized antenna based on the low profile feed structure according to claim 2, wherein the central axis of the long side of the first rectangular metal sheet, the central axis of the first metal arm, and the central axis of the first director are coaxially arranged, and the central axis of the long side of the second rectangular metal sheet, the central axis of the third metal arm, and the central axis of the second director are coaxially arranged.
4. Broadband end-fire circularly polarized antenna based on low profile feed structure according to claim 2, characterized in that the dipole radiating element (6) and the linear tapered slot radiating element are jointly fed by a low profile substrate integrated waveguide SIW consisting of a first rectangular metal sheet, a second rectangular metal sheet, a metal through hole between the two rectangular metal sheets and a SIW port.
5. The broadband endfire circularly polarized antenna based on the low profile feed structure of claim 4, wherein the low profile substrate integrated waveguide SIW has a profile height of only 0.056λ 0 ，λ 0 The air wavelength is the center frequency point of the working frequency band.
6. Broadband end-fire circularly polarized antenna based on low profile feed structure according to claim 1, characterized in that the top metal radiating block (1), bottom metal radiating block (5) are wedge-shaped structures.
7. An antenna array based on a broadband end-fire circularly polarized antenna based on a low profile feed structure as claimed in any one of claims 1 to 6, characterized in that the antenna array comprises 2 N The broadband end-fire circularly polarized antenna unit adopts 1 to 2 minutes N Low profile SIW equal power divider (8) vs. 2 N Feeding by a broadband end-fire circularly polarized antenna unit, 2 of SIW equal power divider (8) N Multiple output ports and 2 N The input ports of the broadband end-fire circularly polarized antenna units are connected.
8. An antenna array according to claim 7, characterized in that each end-fire circularly polarised antenna element input port of the antenna array is provided with a first order inductive window (9) for adjusting the impedance matching of the overall antenna array.
9. The antenna array of claim 8, wherein the array antenna structure is expandable to 1 x 2 N ，N≥2。
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|---|---|---|---|---|
| CN117374579A (en) * | 2023-11-15 | 2024-01-09 | 电子科技大学 | Broadband end-fire circular polarization phased array antenna |
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2021
- 2021-12-31 CN CN202111674851.0A patent/CN116417783A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117374579A (en) * | 2023-11-15 | 2024-01-09 | 电子科技大学 | Broadband end-fire circular polarization phased array antenna |
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