CN116154467B - Dual-frenquency reflection array antenna - Google Patents
Dual-frenquency reflection array antenna Download PDFInfo
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- CN116154467B CN116154467B CN202310352526.5A CN202310352526A CN116154467B CN 116154467 B CN116154467 B CN 116154467B CN 202310352526 A CN202310352526 A CN 202310352526A CN 116154467 B CN116154467 B CN 116154467B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- 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
- 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
- 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
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/20—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements characterised by the operating wavebands
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Abstract
The invention discloses a dual-frequency reflection array antenna, which comprises a feed source and a reflection array, wherein the reflection array comprises a single-layer substrate, a metal ground attached to the bottom surface of the substrate and a patch layer attached to the top surface of the substrate, the patch layer comprises a plurality of high-frequency polarization units and a plurality of low-frequency polarization units, the plurality of high-frequency polarization units are arranged in a matrix of M rows and N columns, and the plurality of low-frequency polarization units are arranged in a matrix of M-1 rows and N-1 columns; the low-frequency polarization units and the high-frequency polarization units are staggered and arranged at intervals. The reflection array adopts a single-layer substrate, does not introduce an extra air layer, and realizes phase shift of more than 360 degrees; the air layer is abandoned, so that extra loss caused by machining and assembling errors can be avoided, and meanwhile, the air layer has the advantages of simple structure, low cost and easiness in machining.
Description
Technical Field
The present invention relates to a reflective array antenna, and in particular, to a dual-band reflective array antenna.
Background
With the development of mobile communication nowadays, 5G/6G will gradually occupy the mainstream, and the problems of frequency resource shortage and frequency conflict are more and more serious, and whether to develop higher frequency band to realize large capacity, long distance communication and superior transmission rate will become the main direction of next generation mobile communication research. Besides realizing effective communication in different frequency bands, the multi-functional beam implementation of the antenna is one of effective methods for meeting different requirements, namely, multi-polarization and multi-beam array antennas, and in the 5G/6G communication, for the multi-frequency high-gain antenna, the channel capacity and the transmission rate are greatly improved while the frequency spectrum resources are saved. The research on the 5G/6G multi-frequency high-gain antenna has important significance for future communication.
Although the reflective array can provide higher gain, the main disadvantage of the reflective array antenna is that the physical size of the antenna design is larger, which is not beneficial to the preparation of the antenna and increases the cost of the antenna; the physical size of the antenna is too small to achieve the preparation precision, the process difficulty is high, and the cost of the antenna is high.
Disclosure of Invention
The invention aims to provide a dual-frequency reflection array antenna with low cost.
In order to solve the technical problem, the technical scheme adopted by the invention is that the dual-frequency reflection array antenna comprises a feed source and a reflection array, wherein the reflection array comprises a single-layer substrate, a metal ground attached to the bottom surface of the substrate and a patch layer attached to the top surface of the substrate, the patch layer comprises a plurality of high-frequency polarization units and a plurality of low-frequency polarization units, the plurality of high-frequency polarization units are arranged in a matrix of M rows and N columns, and the plurality of low-frequency polarization units (M-1) are arranged in a matrix of (N-1) columns; the low-frequency polarization units and the high-frequency polarization units are staggered and arranged at intervals.
The dual-frequency reflection array antenna comprises a low-frequency polarization unit, a first antenna and a second antenna, wherein the low-frequency polarization unit comprises three parallel patch strips, each of the three parallel patch strips comprises a long strip and two short strips, the two short strips are arranged on two sides of the middle part of the long strip in parallel, and long shafts of the long strips are arranged along the Y-axis direction; the high-frequency polarization unit comprises a cross patch, the cross patch comprises an I-shaped structure and a double Y-shaped structure, the bifurcation of the double Y-shaped structure faces outwards, and the rod part of the double Y-shaped structure is orthogonally connected with the rod part of the I-shaped structure; the rod parts of the I-shaped structure are arranged along the Y-axis direction, and the center point of the strip of the low-frequency polarization units is positioned at the intersection point of the diagonals of the adjacent 4 high-frequency polarization units.
The dual-frequency reflection array antenna has M=N, the row spacing and the column spacing of the matrix are 0.55λc-0.65λc, and the thickness of the substrate is 0.08λc-0.15λc; λc is the wavelength corresponding to the band center frequency; the length of the transverse rods at the two ends of the I-shaped structure is 0.10λc-0.30λc, and the length of the long strip is 0.20λc-0.50λc.
The dual-frequency reflection array antenna is characterized in that the patch strip is rectangular, and four corners of the patch strip comprise chamfers; the bifurcation of the double Y-shaped structure forms an included angle of 45 degrees with the rod part.
The double-frequency reflection array antenna is characterized in that the feed source is a rectangular waveguide horn, and the rectangular waveguide horn is vertically arranged above the reflection array and faces the reflection array; when the dual-frequency reflection array antenna works at low frequency, the long axis of the rectangular waveguide horn aperture surface is parallel to the long strip of the low-frequency polarization unit, and when the dual-frequency reflection array antenna works at high frequency, the long axis of the rectangular waveguide horn aperture surface is perpendicular to the long strip of the low-frequency polarization unit.
The dual-frequency reflection array antenna, wherein m=n=33, and the row spacing and the column spacing of the matrix are 1.3mm; the length L=6 mm, the width W=2.6 mm of the horn aperture surface of the rectangular waveguide, and the focal diameter ratio F/D=1.15-1.20; the substrate is a single-layer Rogowski 5880 substrate, and the thickness of the substrate is 0.216mm; the center frequency between the high frequency and the low frequency is 140GHz.
The dual-frequency reflection array antenna has the length of the I-shaped structure of 0.30-0.40 lambda c, the length of the dual-Y-shaped structure of 0.38-0.45 lambda c, the length of the rod part of the dual-Y-shaped structure of 0.20-0.30 lambda c and the bifurcated length of the dual-Y-shaped structure of 0.05-0.15 lambda c; the distance between the short strips and the long strips of the low-frequency polarization unit is 0.04-0.08λc, and the length of the short strips is 0.06-0.10λc.
The length of the transverse rods at the two ends of the I-shaped structure of each high-frequency polarization unit and the length of the long strip of each low-frequency polarization unit of the dual-frequency reflection array antenna are adjusted according to the compensated phase value phi, phi=k 0 (W n -x n *sin(α k ))+Φ 0 Wherein Φ is a compensated phase value; k (k) 0 Is the propagation constant of the wave; w (W) n Length from the array antenna phase center to the nth unit; x is x n The distance from the nth reflecting unit in the array to the geometric center of the plane of the array; alpha k Is the electromagnetic wave reflection angle; phi 0 Is the initial phase reference value.
The reflection array adopts a single-layer substrate, does not introduce an extra air layer, and realizes phase shift of more than 360 degrees; the air layer is abandoned, so that extra loss caused by machining and assembling errors can be avoided, and meanwhile, the air layer has the advantages of simple structure, low cost and easiness in machining.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description.
FIG. 1 is a front view of a dual-frequency reflectarray in accordance with an embodiment of the present invention.
FIG. 2 is a top view of a dual-frequency reflection array according to an embodiment of the present invention.
Fig. 3 is an enlarged view of part of the area i in fig. 2.
Fig. 4 is a block diagram of a high-frequency polarization unit according to an embodiment of the present invention.
Fig. 5 is a block diagram of a low frequency polarization unit according to an embodiment of the present invention.
FIG. 6 is a top view of a dual-band reflective array cell according to an embodiment of the invention.
Fig. 7 is an outline view of a rectangular waveguide horn feed source according to an embodiment of the present invention.
Fig. 8 is a diagram showing the external shape of a dual-band reflection array antenna according to an embodiment of the present invention.
Fig. 9 is a graph of bandwidth and gain performance of a rectangular waveguide horn according to an embodiment of the present invention.
Fig. 10 is an EH-plane beam radiation pattern of a rectangular waveguide horn according to an embodiment of the present invention.
FIG. 11 is a diagram showing the amplitude of the high frequency polarization unit according to the embodiment of the present invention.
FIG. 12 is a graph showing the amplitude of the low frequency polarization unit according to the high frequency structure parameter.
FIG. 13 is a diagram showing the phase shift characteristics of the low frequency polarization unit when the low frequency structure parameters are changed according to the embodiment of the present invention.
Fig. 14 is a schematic diagram showing the phase shift characteristics of the high-frequency polarization unit when the embodiment of the invention is changed along with the high-frequency structural parameters.
FIG. 15 is a graph showing the effect of high frequency structural parameter variation on low frequency phase variation according to an embodiment of the present invention.
FIG. 16 is a graph showing the effect of low frequency structural parameter variation on high frequency phase variation according to an embodiment of the present invention.
Fig. 17 is a graph of bandwidth gain performance for achieving a three-beam effect when feeding a vertical polarization of a reflective array in accordance with an embodiment of the invention.
Fig. 18 is a diagram of a 150GHz symmetric three-beam radiation beam 1 according to an embodiment of the present invention.
Fig. 19 is a diagram of a 150GHz symmetric three-beam radiation beam 2 according to an embodiment of the present invention.
Fig. 20 is a diagram of a 150GHz symmetric three-beam radiation beam 3 according to an embodiment of the present invention.
Fig. 21 is a diagram illustrating 120GHz beam scanning performance in accordance with an embodiment of the present invention.
Detailed Description
The structure and principle of the dual-frequency reflection array antenna in the D frequency band of the embodiment of the present invention are shown in fig. 1 to 21, and include a rectangular waveguide horn 200 and a reflection array 100 as a feed source. The reflective array 100 includes a single-layered substrate 100A, a metal land 100B attached to the bottom surface of the substrate 100A, and a patch layer 100C attached to the top surface of the substrate 100A. The patch layer 100C includes 1089 high-frequency polarization units 10 and 1024 low-frequency polarization units 20, 1089 high-frequency polarization units 10 being arranged in a matrix of 33 rows by 33 columns, and 1024 low-frequency polarization units 20 being arranged in a matrix of 32 rows by 32 columns. 1024 low-frequency polarization units 20 and 1089 high-frequency polarization units 10 are arranged at staggered intervals, and the center point of each low-frequency polarization unit is positioned at the intersection point of two diagonals of the adjacent 4 high-frequency polarization units 10.
The low-frequency polarization unit 20 has three parallel patch strips, including one strip 21 and two short strips 22, the two short strips 22 being arranged in parallel on both sides of the middle of the strip 21, and the long axis of the strip 21 being arranged along the Y-axis direction.
The high-frequency polarization unit 10 is a cross patch, the cross patch comprises an I-shaped structure 11 and a double Y-shaped structure 12, the bifurcations 122 at two ends of the double Y-shaped structure 12 face outwards, and the central point of the rod part 121 of the double Y-shaped structure 12 is orthogonally connected with the central point of the rod part 111 of the I-shaped structure 11. The stem 111 of the I-shaped structure 11 is arranged in the Y-axis direction and the stem 121 of the double Y-shaped structure 12 is arranged in the X-axis direction. As shown in fig. 3, the center point of the strip 21 of the low-frequency polarization unit 20 is located at the intersection of two diagonals 19 of adjacent 4 high-frequency polarization units 10.
The patch strip of the low-frequency polarization unit 20 is in a long rectangular shape, and four corners of the patch strip respectively comprise a chamfer 23 with the angle of 0.01mm multiplied by 45 degrees. The bifurcation 122 of the double Y-shaped structure 12 is at 45 ° to the stem 121.
The length L2 of the I-shaped structure 11 is 0.74mm, the length L3 of the double Y-shaped structure 12 is 0.88mm, the length of the stem L4 of the double Y-shaped structure 12 is 0.57mm, and the bifurcated length L5 of the double Y-shaped structure 12 is 0.18mm. The distance d between the short bar 22 and the long bar 21 of the low-frequency polarization unit 20 is 0.12mm, and the length L6 of the short bar 22 is 0.18mm.
As shown in fig. 7 and 8, a rectangular waveguide horn 200 as a feed source is arranged vertically above the reflection array 100, toward the reflection array 100. Rectangular waveguide horn 200 aperture face length l=6 mm, width w=2.6 mm, and focal diameter ratio F/d=1.18, where d=45 mm, f=53.1 mm.
When the dual-frequency reflection array 100 antenna works at low frequency, the long axis of the aperture surface of the rectangular waveguide horn 200 is arranged along the Y-axis direction and is parallel to the long strip 21 of the low-frequency polarization unit 20. When the dual-frequency reflection array 100 antenna works at high frequency, the long axis of the aperture surface of the rectangular waveguide horn 200 is arranged along the X-axis direction and is perpendicular to the long strip 21 of the low-frequency polarization unit 20. The polarization direction of the feed source can be conveniently adjusted by rotating the rectangular waveguide horn 200 around the vertical axis by 90 degrees.
The row pitch R and the column pitch C of the high frequency polarization unit 33×33 matrix and the low frequency polarization unit 32×32 matrix are both 1.3mm, corresponding to 0.607 λc. λc is the wavelength corresponding to the central frequency of the wave band, the central frequency f c When=140 GHz, the corresponding wavelength λ c =2.143 mm. The substrate 100A was a rogers 5880 substrate having a single layer thickness of 0.216mm and a dielectric constant of 2.2; the thickness is 0.216mm, corresponding to 0.101 λc. The substrate 100A has a square shape of 45mm×45mm, and the substrate bottom surface 100A is entirely covered with the metal land 100B, thereby achieving good reflection performance.
Length B1 of cross bar 112 at both ends of each high-frequency polarization unit I-shaped structure 11 and each low-frequency polarizationThe length L1 of the strip 21 of the unit 20 is adjusted according to the compensated phase value Φ, Φ=k 0 (W n -x n *sin(α k ))+Φ 0 Where Φ is the compensated phase value. k0 is the propagation constant of the wave. Wn is the length from the array antenna phase center to the nth element. X is x n Is the distance from the nth reflecting element in the array to the geometric center of the array plane. αk is the electromagnetic wave reflection angle. Φ0 is the initial phase reference value. The phase center of the array antenna refers to the phase center of the antenna, and theoretically, a signal radiated by the antenna can be equivalently an electromagnetic wave emitted by an ideal point source.
Good reflection coefficients and a phase shift of 360 ° can be obtained in the low frequency band by varying the length L1 of the strip 21 of the low frequency polarization unit 20. The size of the short bar 22 is a fixed value; the length L1 of the strip 21 is adjusted in the range of 0.44mm to 0.86mm. By changing the length B1 of the cross bars 112 at both ends of the I-shaped structure 11 of the high frequency polarization unit, a good reflection coefficient and a phase shift of 360 ° can be obtained in the high frequency band. The length B1 of the rail 112 varies from 0.22mm to 0.64mm. The high-frequency polarization units and the low-frequency polarization units of the two matrixes can construct equiphase surfaces through reflection phase compensation, so that the array can form high-gain beams in a certain direction or in multiple directions.
In the embodiment of the invention, the high frequency is 150GHz, the low frequency is 120GHz, and the method belongs to the D wave band; the center frequency of the international standard D band (110-170 GHz) is 140GHz.
The structure of the reflective array 100 of the present embodiment is shown in fig. 7, where 1089 cells are arranged in a 33 row by 33 column matrix. The unit cell has a size of 1.3X1.3X10.216 mm, and is projected as a square in plan view with the high frequency polarization unit 10 in the middle, and the four corners of the square each include a part of the low frequency polarization unit 20.
As shown in fig. 9 and 10, fig. 9 is a bandwidth and gain performance diagram of the rectangular waveguide horn 200, and fig. 10 is a 3dB beamwidth diagram of the rectangular waveguide horn at a center frequency of 140GHz. The bandwidth of the rectangular waveguide horn 200 is covered by 110-160GHz (< -15 dB), the gain reaches 15dBi at 120GHz, the 3dB beam width of the E face reaches 16.5dBi at 150GHz, the 3dB beam width of the E face is 23 DEG, and the 3dB beam width of the H face is 31 DEG, so that the index requirement of a reflective array feed source can be met.
Fig. 11 is a schematic diagram showing the amplitude of the high-frequency polarization unit as a function of the low-frequency structural parameter L1 (la), and fig. 12 is a schematic diagram showing the amplitude of the low-frequency polarization unit as a function of the high-frequency structural parameter B1 (ch). As can be seen from the graph, the reflection amplitude of the corresponding frequency band is more than 0.95, and the influence of the parameter change between the high-frequency structure and the low-frequency structure on the reflection amplitude is smaller, and the isolation degree is high. Fig. 13 shows the phase shift characteristic of the low-frequency polarization unit 20 at 120GHz along with the change of the low-frequency structural parameter L1 (la), the phase shift is more than 360 ° in the drawing, fig. 14 shows the phase shift characteristic of the high-frequency polarization unit 10 at 150GHz along with the change of the parameter B1 (ch), and the phase shift is more than 360 ° in the drawing, which meets the practical application requirements.
Fig. 15 shows the effect on the low frequency 120GHz phase change when the high frequency 150GHz structural parameter B1 (ch) is changed, and fig. 16 shows the effect on the high frequency 150GHz phase change when the low frequency 120GHz structural parameter L1 (la) is changed. The low-frequency phase change amplitude is smaller than +/-10 degrees, and the influence on the phase is smaller when the structure of the two frequency bands is changed, so that the low-frequency phase change device has good isolation performance and can minimize the mutual interference between the frequency bands.
Fig. 17 is a graph of bandwidth gain performance for achieving a three-beam effect when feeding a reflective array with vertical polarization. The bandwidth covers 130-170GHz, and the highest gain can reach 25.2dBi. The 1dB gain bandwidth is 14.3% (138 GHz-158 GHz).
Fig. 18 is a directional diagram of a 150GHz symmetrical three-beam radiation beam 1, with a deflection angle of 20 °, a gain of up to 25.3dBi, and sidelobe suppression < -12dB, and the three-beam gain is improved by 8.8dBi compared with a rectangular waveguide horn feed source, and has a higher three-beam gain lifting effect.
Fig. 19 is a directional diagram of a 150GHz symmetrical three-beam radiation beam 2, with a deflection angle of 20 °, a gain of up to 24.9dBi, and sidelobe suppression < -12.5dB, and the three-beam gain is improved by 8.4dBi compared with a rectangular waveguide horn feed source, and has a higher three-beam gain improvement effect.
Fig. 20 is a directional diagram of a 150GHz symmetrical three-beam radiation beam 3, the deflection angle is 20 degrees, the gain is up to 25.1dBi, sidelobe suppression is < -12.8dB, the three-beam gain is improved by 8.6dBi compared with a rectangular waveguide horn feed source, and the three-beam gain improving effect is higher.
Fig. 21 is a graph of bandwidth gain performance when beam scanning effect is achieved when feeding the horizontal polarization of the reflective array, and it can be seen from fig. 21 that the beam scanning angle reaches ±35°, the maximum gain reaches 25.2dBi, the gain variation is only 1.4dBi, and the sidelobe suppression is < -10dB. Has good beam scanning characteristics.
The dual-frequency reflection array antenna of the D frequency band has the following beneficial effects:
1) The invention adopts a single-layer substrate, does not introduce an extra air layer, realizes phase shift of more than 360 degrees, can avoid extra loss caused by processing and assembling errors because the air layer is abandoned, and has the advantages of simple structure, low cost and easy processing.
2) In order to realize the dual-frequency function, two polarization structures of two frequency bands are adopted for combination, and good reflection coefficient and good phase shift characteristic of the working frequency band are respectively realized. Meanwhile, in order to obtain high isolation between two frequency bands, two mutually orthogonal polarization directions are adopted horizontally and vertically, a horizontal polarization characteristic is used near 120GHz of low frequency, a vertical polarization characteristic is used near 150GHz of high frequency, when one structural parameter changes, the influence on the amplitude and the phase shift of the other structure is small, so that the influence on the array beam performance is avoided, the mutual influence between the structures is reduced to the minimum, and the excellent performance of the dual-frequency array beam is obtained.
3) In order to realize the high-gain multifunctional beam performance, a 33 multiplied by 33 planar array is formed, a rectangular waveguide horn is adopted to feed at a certain distance above the array, and for different polarizations of different frequency bands, the feed waveguide horn is rotated by 90 degrees to excite a corresponding reflecting unit. Through the optimal design of the phase, the beam scanning function is realized in a low frequency band, the symmetrical three-beam function is realized in a high frequency band, and the obtained array has good beam effect.
4) For the design of low-frequency phase, the phase of beam scanning is realized by averaging the sum of different deflection angle phases in the horizontal direction after the focal diameter ratio is selected, so that the gain loss caused by deflection can be reduced, the scanning angle is increased, and the side lobe can be reduced. The phase positions of the symmetrical three-beam effect near the high frequency band 150GHz are subjected to vector superposition by beam phase diagrams in different deflection directions, and gain improvement and sidelobe improvement are performed through an optimization algorithm.
Claims (8)
1. The dual-frequency reflection array antenna comprises a feed source and a reflection array, wherein the reflection array comprises a single-layer substrate, a metal ground attached to the bottom surface of the substrate and a patch layer attached to the top surface of the substrate, and is characterized in that the patch layer comprises a plurality of high-frequency polarization units and a plurality of low-frequency polarization units, the plurality of high-frequency polarization units are arranged in a matrix of M rows and N columns, and the plurality of low-frequency polarization units are arranged in a matrix of M-1 rows and N-1 columns; the lengths of transverse rods at two ends of the I-shaped structure of each high-frequency polarization unit and the lengths of long strips of each low-frequency polarization unit are adjusted according to the compensated phase value; the low-frequency polarization units and the high-frequency polarization units are alternately arranged at intervals, two mutually orthogonal polarization directions are adopted, the horizontal polarization characteristic is used at the low frequency, the vertical polarization characteristic is used at the high frequency, the good reflection coefficient and the good phase shift characteristic of the working frequency band are realized, and the high isolation between the two frequency bands is obtained; the low-frequency polarization unit comprises three parallel patch strips, wherein the three parallel patch strips comprise a strip and two short strips, the two short strips are arranged on two sides of the middle part of the strip in parallel, and the long axis of the strip is arranged along the Y-axis direction; the patch strip is rectangular, and four corners of the patch strip comprise chamfers; the high-frequency polarization unit comprises a cross patch, the cross patch comprises an I-shaped structure and a double Y-shaped structure, the bifurcation of the double Y-shaped structure faces outwards, and the rod part of the double Y-shaped structure is orthogonally connected with the rod part of the I-shaped structure; the rod parts of the I-shaped structures are arranged along the Y-axis direction, and the center points of the strips of the low-frequency polarization units are positioned at the intersection points of the diagonals of the adjacent 4 high-frequency polarization units; the beam scanning function is realized in the low frequency band, and the symmetrical three-beam function is realized in the high frequency band.
2. The dual-band reflection array antenna according to claim 1, wherein m=n, the row pitch and column pitch of the matrix are 0.55λc to 0.65λc, and the thickness of the substrate is 0.08λc to 0.15λc; λc is the wavelength corresponding to the center frequency between the high frequency and the low frequency, and when the center frequency fc=140 GHz, the corresponding wavelength λc=2.143 mm; the length of the transverse rods at the two ends of the I-shaped structure is 0.10λc-0.30λc, and the length of the long strip is 0.20λc-0.50λc.
3. The dual frequency reflectarray antenna as set forth in claim 2, wherein the bifurcation of the double Y-shaped structure forms an angle of 45 ° with the stem.
4. The dual-frequency reflective array antenna of claim 1, wherein said feed is a rectangular waveguide horn, said rectangular waveguide horn being disposed vertically above the reflective array, toward the reflective array; when the dual-frequency reflection array antenna works at low frequency, the long axis of the rectangular waveguide horn aperture surface is parallel to the long strip of the low-frequency polarization unit, and when the dual-frequency reflection array antenna works at high frequency, the long axis of the rectangular waveguide horn aperture surface is perpendicular to the long strip of the low-frequency polarization unit; the rectangular waveguide horn rotates around the vertical axis by 90 degrees, so that the polarization direction of the feed source is adjusted to excite the corresponding reflecting unit, the beam scanning function is realized in a low frequency band, the symmetrical three-beam function is realized in a high frequency band, and the obtained array has a good beam effect.
5. The dual-frequency reflective array antenna of claim 4, wherein M = N = 33, the matrix has a row spacing and a column spacing of 1.3mm; the length L=6 mm, the width W=2.6 mm of the horn aperture surface of the rectangular waveguide, and the focal diameter ratio F/D=1.15-1.20; the substrate was a single layer Rogowski 5880 substrate, with a thickness of 0.216mm.
6. The dual-band reflection array antenna of claim 2, wherein the I-shaped structure has a length of 0.30 λc to 0.40 λc, the dual-Y-shaped structure has a length of 0.38 λc to 0.45 λc, the dual-Y-shaped structure has a length of 0.20 λc to 0.30 λc, and the dual-Y-shaped structure has a bifurcated length of 0.05 λc to 0.15 λc; the distance between the short strips and the long strips of the low-frequency polarization unit is 0.04-0.08λc, and the length of the short strips is 0.06-0.10λc.
7. The dual-band reflection array antenna according to claim 1, wherein lengths of the transverse rods at both ends of the I-shaped structure of each high-frequency polarization unit are adjusted according to the phase value phi compensated by the multi-beam vector superposition method, lengths of the long strips of each low-frequency polarization unit are adjusted according to the phase value phi compensated by the beam scanning phase,（1）
wherein Φ is a compensated phase value; k (k) 0 Is the propagation constant of the wave; w (W) n The length from the phase center of the array antenna to the nth high-frequency polarization unit or low-frequency polarization reflection unit; x is x n The distance from the nth high-frequency polarization unit or low-frequency polarization reflection unit in the array to the geometrical center of the plane of the array; alpha k Is the electromagnetic wave reflection angle; phi 0 Is the initial phase reference value.
8. The dual-band reflection array antenna according to claim 1, wherein the 360 ° phase shift of the low frequency band is achieved by changing the length of the middle strip of the low frequency polarization unit in a range of 0.44mm to 0.86 mm; the length of transverse rods at two ends of the I-shaped structure of the high-frequency polarization unit is changed to be 0.22mm-0.64mm, so that 360-degree phase shift of a high frequency band is realized; the high-frequency polarization units and the low-frequency polarization units of the two matrixes are used for constructing an equiphase surface through reflection phase compensation, so that the array realizes a beam scanning effect at low frequency and realizes a three-beam radiation effect at high frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310352526.5A CN116154467B (en) | 2023-04-04 | 2023-04-04 | Dual-frenquency reflection array antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310352526.5A CN116154467B (en) | 2023-04-04 | 2023-04-04 | Dual-frenquency reflection array antenna |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116154467A CN116154467A (en) | 2023-05-23 |
| CN116154467B true CN116154467B (en) | 2023-10-20 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102694274A (en) * | 2011-03-25 | 2012-09-26 | 深圳光启高等理工研究院 | Communication method and apparatus thereof |
| CN102694621A (en) * | 2011-03-25 | 2012-09-26 | 深圳光启高等理工研究院 | Space encoding method and apparatus thereof |
| CN105356066A (en) * | 2015-11-18 | 2016-02-24 | 中国科学院国家空间科学中心 | X/Ku-frequency-band double-frequency dual-polarization microstrip-flat-reflective-array antenna |
| CN111193108A (en) * | 2020-02-24 | 2020-05-22 | 西南交通大学 | High-power capacity dual-band elliptical patch reflection array antenna |
| CN115336104A (en) * | 2020-02-06 | 2022-11-11 | 美波公司 | Reflectarray antenna for enhanced wireless communication coverage area |
| CN115377696A (en) * | 2022-08-24 | 2022-11-22 | 合肥工业大学 | Orbital angular momentum vortex electromagnetic wave multiplexing device |
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| US7623088B2 (en) * | 2007-12-07 | 2009-11-24 | Raytheon Company | Multiple frequency reflect array |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102694274A (en) * | 2011-03-25 | 2012-09-26 | 深圳光启高等理工研究院 | Communication method and apparatus thereof |
| CN102694621A (en) * | 2011-03-25 | 2012-09-26 | 深圳光启高等理工研究院 | Space encoding method and apparatus thereof |
| CN105356066A (en) * | 2015-11-18 | 2016-02-24 | 中国科学院国家空间科学中心 | X/Ku-frequency-band double-frequency dual-polarization microstrip-flat-reflective-array antenna |
| CN115336104A (en) * | 2020-02-06 | 2022-11-11 | 美波公司 | Reflectarray antenna for enhanced wireless communication coverage area |
| CN111193108A (en) * | 2020-02-24 | 2020-05-22 | 西南交通大学 | High-power capacity dual-band elliptical patch reflection array antenna |
| CN115377696A (en) * | 2022-08-24 | 2022-11-22 | 合肥工业大学 | Orbital angular momentum vortex electromagnetic wave multiplexing device |
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