CN110571531A - Multi-beam phased array antenna based on parabolic cylinder reflective array - Google Patents
Multi-beam phased array antenna based on parabolic cylinder reflective array Download PDFInfo
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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
- H01Q15/16—Reflecting surfaces; Equivalent structures curved in two dimensions, e.g. paraboloidal
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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
- H01Q19/12—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 wherein the surfaces are concave
- H01Q19/17—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 wherein the surfaces are concave the primary radiating source comprising two or more radiating elements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/29—Combinations of different interacting antenna units for giving a desired directional characteristic
- H01Q21/293—Combinations of different interacting antenna units for giving a desired directional characteristic one unit or more being an array of identical aerial elements
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Abstract
The embodiment of the invention provides a multi-beam phased array antenna based on a parabolic cylinder reflection array, wherein each unit of a feed source array independently receives a beam excited and compensated by the parabolic cylinder reflection array, the feed source array of M multiplied by N units can receive M multiplied by N beams in total, the parabolic cylinder reflection array is respectively provided with a plurality of reflection units with different phase compensation values, a dielectric layer and a metal back plate from inside to outside, and the reflection units can compensate the required phase according to the feed source position to further realize incoming wave focusing; the metal back plate is used for reflecting plane wave fronts at the aperture of the feed beam forming. The antenna eliminates the inherent system defect of low elevation gain loss of the reflection type phased array multi-beam antenna on the premise of not increasing additional aperture surface, weight and cost, and realizes flexible power scheduling and beam agility forming. The method also has the advantages of large number of wave beams, wide coverage area, high radiation efficiency, strong system flexibility and anti-interference performance and the like, and is suitable for the objective requirements of complex communication environment and high-speed communication links.
Description
Technical Field
the invention relates to a phased array antenna, in particular to a multi-beam phased array antenna based on a parabolic cylinder reflection array.
Background
In the field of communication technology, antennas are particularly important as radiation windows for electromagnetic signals, and various antennas with different functions are used in the invention in order to adapt to different communication scenarios.
In order to generate high-gain low-sidelobe spot beams in modern communication links, an electric large-aperture antenna is generally required, and compared with a traditional high-gain electric large-aperture antenna with a fixed coverage target area, a phased array multi-beam antenna not only has strong directivity, but also can realize wide-area coverage. Common phased array multi-beam antennas comprise a direct radiation type phased array multi-beam antenna and a reflection type phased array multi-beam antenna, the direct radiation type phased array multi-beam antenna has flexible scanning, agility and shaping capabilities, and is suitable for complex communication scenes needing to track fast moving targets and fast response.
Compared with a direct radiation type phased array multi-beam antenna, the reflection type phased array multi-beam antenna has the advantages of small channel scale, large number of formed beams and the like, but because the number of the feed sources of the reflection type phased array multi-beam antenna is small, and only part of the feed sources are used in each coverage area, along with the increase of a scanning angle, the reduction of beam gain is severe, the waveform change is large, meanwhile, the limited degree of freedom enables beam forming and zero setting to be relatively difficult, and the gain loss caused is large.
Disclosure of Invention
the technical problem to be solved by the invention is how to provide a multi-beam phased array antenna based on a parabolic cylinder reflection array, so as to solve the technical problems of poor power scheduling flexibility and severe gain reduction at a large scanning angle of a reflective phased array multi-beam antenna in the prior art.
The invention solves the technical problems through the following technical means:
The embodiment of the invention provides a multi-beam phased array antenna based on a parabolic cylinder reflection array, which comprises: a feed source array and a parabolic cylinder reflective array, wherein,
The feed array includes: a phased array consisting of M multiplied by N transmitting and receiving common-caliber radiation units, wherein M is more than 2, and N is more than 2;
The parabolic cylinder reflective array comprises: the reflecting unit array comprises a parabolic cylindrical backboard, a dielectric substrate and a reflecting unit arranged on the dielectric substrate, wherein the parabolic cylindrical backboard is made of metal materials, and the reflecting unit array is arranged on the surface of the dielectric substrate;
By applying the embodiment of the invention, the parabolic cylinder reflective array is utilized to perform phase compensation focusing on the received multi-beam, and the focused beam is radiated to the feed source array surface, thereby realizing large-range airspace receiving; meanwhile, each row line-shaped subarray of the feed source array can emit one-dimensional phased scanning beams, and plane wave radiation is formed in a far field after the beams are reflected by the parabolic cylinder metal back plate.
The reflecting unit array is arranged on the parabolic cylinder backboard, and the reflecting array unit performs phase compensation on the received wave beams to reflect the compensated wave beams to the corresponding radiation units, so that the feed source array can receive the incoming waves subjected to the phase compensation, and then multi-beam receiving can be realized.
Optionally, the feed source array is arranged on a focus of the parabolic cylinder reflection array for bias feeding; and the focal length of the parabolic cylinder reflection array is greater than the working wavelength of the phased array antenna.
Optionally, the radiation mode of the feed source array includes:
And forming a plane wave front at the aperture by radiating the beam radiated by the feed source on the pitching surface of the parabolic cylinder antenna in a constant amplitude and in phase manner, wherein the azimuth surface is a horizontal plane parallel to the focal line of the parabolic cylinder reflective array antenna.
Optionally, a distance D between the reflection units is not greater than 0.5 λ, where λ is a wavelength corresponding to an operating frequency of the feed source array.
optionally, the calculation formula of the phase compensation value of the reflection unit includes:
Φ＝k0(Rn-xn sinθr)+Φ0wherein, in the step (A),
Phi is a phase compensation value of the reflection unit; k is a radical of0Is the electromagnetic wave propagation constant of free space; rnIs the distance x from the phase center of the feed source array to the nth reflecting unitnThe distance from the nth reflecting unit to the central reference unit in the array; thetarThe reflection angle of the reflected electromagnetic wave relative to the tangent of the parabolic cylinder; phi0Is the reference phase.
Optionally, the antenna further includes: and the dielectric layer covers the reflecting surface of the parabolic cylindrical backboard, and the reflecting unit is printed on the dielectric layer.
Optionally, the reflection unit has a low-profile structure, and includes: one or a combination of reflection units with the same size and different rotation angles, an open gap rectangular open-loop reflection unit and a square cross-shaped groove reflection unit.
Optionally, the feed source array is an active phased array, the array surface is composed of a plurality of sub-arrays arranged at equal intervals in the pitching direction, and the distance L between adjacent sub-arrays is greater than or equal to 3 λ; each subarray comprises a plurality of radiating elements arranged in an array.
Optionally, the radiation elements in each sub-array adopt a triangular array form, and a center-to-center distance W between adjacent radiation elements is 0.7 λ, where λ is a wavelength corresponding to an operating frequency of the feed source array.
Optionally, the radiation unit includes: one or a combination of dipoles, microstrip patches, coupling laminated patches, rectangular waveguides and circular horns.
The invention has the advantages that:
(1) The parabolic cylinder reflecting array is utilized to carry out phase compensation focusing on the received multi-beam, and the focused beam is radiated to the feed source array surface, so that large-range airspace receiving is realized; meanwhile, each row line-shaped subarray of the feed source array can emit one-dimensional phased scanning beams, and plane wave radiation is formed in a far field after the beams are reflected by the parabolic cylinder metal back plate.
(2) By applying the embodiment of the invention, the inherent system defect of low elevation gain loss of the reflective phased array multi-beam antenna is eliminated on the premise of not increasing additional aperture surface, weight and cost, and flexible power scheduling and beam agility forming are realized. Meanwhile, the invention has the advantages of more wave beams, wide coverage area, high radiation efficiency, strong system flexibility and anti-interference performance and the like, can adapt to complex communication environment and meet the objective requirement of modern high-speed communication links.
Drawings
Fig. 1 is a schematic structural diagram of a parabolic cylindrical reflector array in a multi-beam phased array antenna based on a parabolic cylindrical reflector array according to an embodiment of the present invention;
Fig. 2 is a schematic structural diagram of a multi-beam phased array antenna based on a parabolic cylinder reflective array according to an embodiment of the present invention;
Fig. 3 is a schematic diagram of an electromagnetic wave reflection path when a multi-beam phased array antenna based on a parabolic cylinder reflective array receives a beam according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an electromagnetic wave reflection path when a multi-beam phased array antenna based on a parabolic cylinder reflective array radiates a beam outwards according to an embodiment of the present invention;
Fig. 5 is a schematic structural diagram of a feed array in a multi-beam phased array antenna based on a parabolic cylinder reflection array 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.
Example 1
the embodiment of the invention provides a multi-beam phased array antenna based on a parabolic cylinder reflection array, which comprises: a feed array 10 and a parabolic cylindrical reflective array, wherein,
The feed array 10 includes: a phased array consisting of 8 x 8 transceiving common-caliber radiation units; the feed array 10 comprises two rows of 16 radiation elements 11 with a center distance of 0.7 lambda, wherein lambda is the wavelength corresponding to the working frequency of the feed array 10.
Fig. 1 is a schematic structural diagram of a parabolic cylindrical backplane in a multi-beam phased-array antenna based on a parabolic cylindrical reflective array according to an embodiment of the present invention; as shown in fig. 1, the parabolic cylindrical reflective array includes: the reflecting unit 22 is arranged on the parabolic cylindrical backboard 21, wherein the focal line of the parabolic cylindrical backboard 21 is arranged in parallel to the horizontal plane, and the parabolic cylindrical surface is formed by translating a parabolic generatrix along the focal line; the caliber height is H, the focal length of the parabola bus is F, and the relationship between the focal length and the caliber height is as follows: f is (0.7-1.0) H. The metal back plate 4 has a focusing characteristic on the elevation plane to narrow only the elevation beam.
The formula can be used, phi ═ k0(Rn-xn sinθr)+Φ0Calculating the phase compensation value of each reflection unit 22, and further determining the technical parameters of the reflection unit 22, wherein Φ is the phase compensation value of the reflection unit 22; k is a radical of0Is the electromagnetic wave propagation constant of free space; rnIs the distance x from the phase center of the feed array 10 to the nth reflection unit 22nThe distance from the nth reflecting element 22 in the array to the central reference element; thetarThe reflection angle of the reflected electromagnetic wave relative to the tangent of the parabolic cylinder; phi0is the reference phase. Then, the rectangular metal microstrip patches are arranged on the parabolic cylinder back plate 21 as an array of reflection units 22, and the reflection array units perform phase compensation on the received beams and reflect the compensated beams to the corresponding radiation units.
The parabolic cylinder reflective array has different phase compensation values from the reflective unit 22 located in the middle to the reflective unit 22 located at the edge.
When the embodiment of the present invention is applied to wave beam reception, when 64 wave beams emitted from an emitter corresponding to the reflection unit 22 are radiated to the reflection unit 22, induced currents are excited in the reflection array unit 2, the reflection units 22 with different sizes, such as microstrip patches, generate induced currents with different path lengths, the induced currents of each unit generate different phase differences in the radiation wave beams of the azimuth plane, the parabolic cylinder reflection array compensates the required phases one by one for the reflection units 22 on the azimuth plane to achieve incoming wave focusing, the 64 radiation units, such as circular-caliber horn units, on the active antenna array surface respectively and independently receive one wave beam, then the wave beam is filtered and amplified by the T/R assembly to form 64 independent wave beam signals, and the 64 independent wave beam signals are sent to the rear-end processing module, thereby achieving wide-airspace coverage in a far field.
In another specific implementation manner of the embodiment of the present invention, the feed source array 10 has a fixed phase center, the phase center of the fixed phase center coincides with the focus of the parabolic cylinder, and the feed source array 10 adopts a positive feed mode, that is, a connection line between the feed source array 10 and the central point of the parabolic cylinder is perpendicular to a plane where a straight line edge of the parabolic cylinder is located. Compared with the parabolic cylinder reflection array, the whole aperture of the active array surface of the feed source array 10 is smaller, the whole phase deviation of the aperture reference surface is not large, and the feed source aperture can be approximately considered to have an in-phase field. The feed source array 10 is arranged on the focus of the parabolic cylinder reflection array for feeding; and the focal length of the parabolic cylinder reflection array is greater than the operating wavelength of the phased array antenna, and may be, for example, 100 times, 500 times, 1000 times, 2000 times, etc. of the operating wavelength of the phased array antenna. The feed array 10 has one degree of freedom in the azimuth plane to enable the feed array 10 to perform multi-beam scanning on the azimuth plane. The radiation mode of the feed source array 10 comprises: and performing one-dimensional phase control scanning on an azimuth plane of the parabolic cylinder antenna so as to radiate a beam radiated by the feed source array 10 in a constant amplitude and in phase on a pitching plane of the parabolic cylinder antenna to form a plane wave front at an aperture, wherein the azimuth plane is a horizontal plane parallel to a focal line of the parabolic cylinder reflection array antenna.
in practical applications, the radiation unit includes: one or a combination of dipoles, microstrip patches, coupling laminated patches, rectangular waveguides and circular horns.
When the embodiment of the invention is applied to wave beam transmission, the feed source array 10 sends the transmission wave beam signals of the processing module into the wave beam forming module, the signals are sent to the transmitting component after being weighted, phase-shifted and delayed in the wave beam forming module, the signals enter the aperture surface of the active phased array after being filtered and amplified by the transmitting component, 4 azimuth scanning wave beams with high directivity and weak directivity of a pitching surface are formed on the aperture surface, because the parabolic cylinder has a focusing function on the pitching surface, each independent scanning wave beam is focused on the pitching surface after being reflected by the metal back plate, and then the high-gain azimuth scanning function is realized in a far field, and the phased array antenna can perform one-dimensional scanning transmission on the parabolic cylinder along the focal line direction of the parabolic cylinder, so that the high-gain scanning transmission function is realized.
moreover, in the direct radiation type phased array antenna in the prior art, due to the inherent limitation of the antenna system, the number of the elements of the passive antenna array surface is usually huge, high gain can be obtained only at the cost of high cost and multiple channels, and the direct radiation type phased array antenna is limited by the size of the channel scale, and the number of the formed wave beams is small. In the embodiment of the invention, an active phased array is used as a feed source array 10, and radiation beams are focused through a metal back plate, so that high-gain agile scanning multi-beam is obtained; the incoming wave focusing is completed through the phase compensation of the azimuth plane of the reflection array, so that the multi-beam wide-angle wide-area coverage is realized. Compared with the common reflection type multi-beam phased array antenna system, the low elevation gain is improved, and the coverage range is enlarged; compared with the common direct radiation type multi-beam phased array antenna system, the system complexity is reduced, and the beam number is increased.
in addition, because the existing reflection-type phased-array multi-beam antenna has fewer radiation units and only part of the radiation units are used in each coverage area, the beam gain is reduced more severely along with the increase of the scanning angle, the waveform change is larger, and the gain loss is larger. Therefore, the reflective phased array multi-beam antenna is not suitable for a communication system with wide coverage, wide viewing angle and multiple inputs. Compared with the traditional active phased array antenna, the active phased array antenna has the advantages of being small in channel scale, low in cost and the like.
Finally, in the phased array antenna system in the prior art, the low-frequency-band emission sparse feed and the high-frequency-band emission full-array feed are adopted to realize double-frequency high-efficiency broadband emission, the phenomenon that a broadband T/R component is connected behind each broadband radiation unit of a classical broadband active phased array is avoided, the emission efficiency is extremely low, only about 10% of power is effectively utilized to radiate outwards, about 90% of power is converted into heat consumption to remain between a phased array surface and a T/R receiving channel, the heat dissipation pressure of the phased array system is extremely high, and the cost of the broadband T/R component is extremely high. A broadband phased array system designed by a classical method has the problems of high cost, low radiation efficiency, high system heat dissipation pressure, high chip temperature and damage caused by high system heat dissipation pressure and the like. In the embodiment of the invention, the reflecting unit array is arranged on the parabolic cylinder backboard, and the reflecting array unit performs phase compensation on the received wave beams and reflects the compensated wave beams to the corresponding radiation units, so that the feed source array can receive incoming waves with different wavelengths after the phase compensation, and further realize the multi-beam reception.
Example 2
Fig. 2 is a schematic structural diagram of a multi-beam phased array antenna based on a parabolic cylinder reflective array according to an embodiment of the present invention, as shown in fig. 2, the difference between the embodiment 2 and the embodiment 1 is that, in order to eliminate the shielding of the beam radiated by the parabolic cylinder, bias feeding is adopted, and the axis of the feed source array 10 is directed at an angle θ with respect to the horizontal line0the aperture is uniformly irradiated, the energy leakage at the edge of the parabolic cylinder is minimized, the problems of gain reduction, side lobe level increase and the like of the antenna due to shielding are solved, and the port matching of the antenna is improved.
Furthermore, in order to avoid the influence of the feed source on the radiation beam characteristics of the parabolic cylinder and ensure that the beam reflected by the metal back plate 4 does not influence the normal work of the feed source, the part of the parabolic cylinder with the opening angle omega less than or equal to 5 degrees is cut off.
Further, as shown in fig. 2, in order to reduce the processing cost and suppress the grating lobe, a triangular array is adopted, and the radiation element pitch W is 0.7 λ, where λ is a wavelength corresponding to the operating frequency. The radiating unit of the subarray is a circular caliber loudspeaker 4, a receiving and transmitting common caliber system is adopted, the polarization mode is circular polarization, and the caliber size d is equal to W. In order to form the independent 4 beams, the distance L between the adjacent sub-arrays is 3 λ. The transmitting channels of the feed source array 10 are composed of a power supply, a transmitting assembly and a beam forming module, the beam forming module is connected with 4 transmitting channels, and each transmitting channel is respectively connected with one linear array; the receiving channel of the feed source 1 is composed of a power supply and a receiving component, and each circular caliber loudspeaker unit 4 is connected with one receiving channel. The circular caliber horn unit 4 is connected with the T/R assembly, the T/R assembly and the beam forming module 5 in a blind matching mode.
It should be noted that, the circular waveguide horn antenna for radiating electromagnetic beams on the T/R module is a radiating unit. In addition, the spacing between the radiation units can be adjusted according to actual needs, and the embodiment of the invention is not limited thereto.
Fig. 3 is a schematic diagram of an electromagnetic wave reflection path when a multi-beam phased array antenna based on a parabolic cylinder reflective array receives a beam according to an embodiment of the present invention; as shown in fig. 3, the receiving principle in embodiment 2 of the present invention is the same as that in embodiment 1, and the details of the embodiment of the present invention are not repeated here.
Fig. 4 is a schematic diagram of an electromagnetic wave reflection path when a multi-beam phased array antenna based on a parabolic cylinder reflective array radiates a beam outwards according to an embodiment of the present invention; as shown in fig. 4, the transmission principle in embodiment 2 of the present invention is the same as the reception principle in embodiment 1, and the details of the embodiment of the present invention are not repeated here.
example 3
Fig. 5 is a schematic structural diagram of a feed array 10 in a multi-beam phased array antenna based on a parabolic cylinder reflection array according to an embodiment of the present invention, as shown in fig. 1, embodiment 3 differs from embodiment 1 in that: the feed source array 10 is an active phased array, an active antenna array surface of the feed source array 10 comprises 4 sub-arrays, each sub-array is a linear array, and each sub-array comprises two rows of radiating units arranged in a linear array; two rows of radiation units are arranged in a staggered manner; the two rows of radiation units in each sub-array are staggered in a triangular array form, namely, the distance between one radiation unit in one row and two adjacent radiation units in the other row is the same.
The distance L between adjacent subarrays is 10 lambda; each subarray comprises a plurality of radiating elements arranged in an array. In practical applications, the distances between adjacent sub-arrays include, but are not limited to, 3 λ, 10 λ, 20 λ, 500 λ, and 1000 λ, and the actual distances thereof may be adjusted according to actual needs, and the distances between adjacent sub-arrays are not limited herein in the embodiments of the present invention.
in a specific implementation manner of the embodiment of the present invention, in order to reduce the mutual coupling effect between the reflection units 22 and to take the requirement of discrete distribution into consideration, the distance D between the reflection units 22 is less than or equal to 0.5 λ, where λ is the wavelength corresponding to the operating frequency of the feed array 10. It will be appreciated that the spacing D between the reflective elements 22 should be greater than the sum of the radii of two adjacent reflective elements.
In a specific implementation manner of the embodiment of the present invention, the antenna further includes: a dielectric layer 30, wherein the dielectric layer 30 covers the reflective surface of the parabolic cylindrical back plate 21, and the reflective unit 22 is printed on the dielectric layer 30.
in order to reduce the radiation loss of the reflection unit 22, the dielectric substrate is made of a material having a low dielectric constant, a low loss tangent angle, and a low water absorption rate, and the plate thickness h is selected to be 0.05 λ in order to suppress surface waves and ensure a certain operating bandwidth.
For convenience of design and processing, phases compensated by different sizes of the reflective array unit 2 need to be cycled by taking 360 degrees as a period, so that integral multiples of wavelengths can be directly eliminated.
In a specific implementation manner of the embodiment of the present invention, in order to adapt to different types of reflection units 22, the reflection unit 22 has a low-profile structure, and includes: one or a combination of the reflecting units 22 with the same size and different rotation angles, the open-slot rectangular open-loop reflecting unit 22 and the square cross-slot reflecting unit 22.
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. a multi-beam phased array antenna based on a parabolic cylindrical reflector array, the antenna comprising: a feed source array and a parabolic cylinder reflective array, wherein,
The feed array includes: a phased array consisting of M multiplied by N transmitting and receiving common-caliber radiation units, wherein M is more than 2, and N is more than 2;
The parabolic cylinder reflective array comprises: the reflecting unit array comprises a parabolic cylindrical backboard, a dielectric substrate and a reflecting unit arranged on the dielectric substrate, wherein the parabolic cylindrical backboard is made of metal materials, and the reflecting unit array is arranged on the surface of the dielectric substrate;
The radiation unit performs phase compensation focusing on each beam and radiates the focused beam to the feed source array surface, thereby realizing large-range airspace receiving.
2. The multi-beam phased array antenna based on the parabolic cylinder reflective array according to claim 1, wherein the feed source array is arranged on a focus of the parabolic cylinder reflective array for bias feeding; and the focal length of the parabolic cylinder reflection array is greater than the working wavelength of the phased array antenna.
3. the multi-beam phased array antenna based on the parabolic cylinder reflector array according to claim 1, wherein the radiation pattern of the feed array comprises:
And forming a plane wave front at the aperture by radiating the beam radiated by the feed source on the pitching surface of the parabolic cylinder antenna in a constant amplitude and in phase manner, wherein the azimuth surface is a horizontal plane parallel to the focal line of the parabolic cylinder reflective array antenna.
4. the multi-beam phased array antenna based on the parabolic cylinder reflector array is characterized in that the distance D between the reflector units is less than or equal to 0.5 lambda, wherein lambda is the wavelength corresponding to the working frequency of the feed source array.
5. The multi-beam phased array antenna based on the parabolic cylinder reflector array according to claim 1, wherein the calculation formula of the phase compensation value of the reflector unit comprises:
Φ＝k0(Rn-xnsinθr)+Φ0Wherein, in the step (A),
Phi is a phase compensation value of the reflection unit; k is a radical of0Is the electromagnetic wave propagation constant of free space; rnIs the distance x from the phase center of the feed source array to the nth reflecting unitnThe distance from the nth reflecting unit to the central reference unit in the array; thetarThe reflection angle of the reflected electromagnetic wave relative to the tangent of the parabolic cylinder; phi0Is the reference phase.
6. A multi-beam phased array antenna based on a parabolic cylindrical reflector array according to claim 1, characterized in that said antenna further comprises: and the dielectric layer covers the reflecting surface of the parabolic cylindrical backboard, and the reflecting unit is printed on the dielectric layer.
7. The multi-beam phased array antenna based on the parabolic cylinder reflector array as claimed in claim 6, wherein said reflector unit is of low profile structure and comprises: one or a combination of reflection units with the same size and different rotation angles, an open gap rectangular open-loop reflection unit and a square cross-shaped groove reflection unit.
8. The multi-beam phased array antenna based on the parabolic cylinder reflection array according to claim 1, characterized in that the feed source array is an active phased array, a wavefront consists of a plurality of sub-arrays arranged in the pitching direction at equal intervals, and the distance L between adjacent sub-arrays is more than or equal to 3 λ; each subarray comprises a plurality of radiating elements arranged in an array.
9. The multibeam phased array antenna based on the parabolic cylinder reflector array according to claim 8, wherein the radiating elements in each subarray are in a triangular array, and a center-to-center distance W between adjacent radiating elements is 0.7 λ, where λ is a wavelength corresponding to an operating frequency of the feed array.
10. The multi-beam phased array antenna based on a parabolic cylinder reflector array according to claim 1, characterized in that said radiating element comprises: one or a combination of dipoles, microstrip patches, coupling laminated patches, rectangular waveguides and circular horns.
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