CN113938218B - Ka frequency channel phased array antenna transmission subassembly - Google Patents
Ka frequency channel phased array antenna transmission subassembly Download PDFInfo
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- CN113938218B CN113938218B CN202111274237.5A CN202111274237A CN113938218B CN 113938218 B CN113938218 B CN 113938218B CN 202111274237 A CN202111274237 A CN 202111274237A CN 113938218 B CN113938218 B CN 113938218B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/101—Monitoring; Testing of transmitters for measurement of specific parameters of the transmitter or components thereof
- H04B17/102—Power radiated at antenna
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
- H01Q3/30—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture varying the relative phase between the radiating elements of an array
- H01Q3/34—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture varying the relative phase between the radiating elements of an array by electrical means
- H01Q3/36—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture varying the relative phase between the radiating elements of an array by electrical means with variable phase-shifters
- H01Q3/38—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture varying the relative phase between the radiating elements of an array by electrical means with variable phase-shifters the phase-shifters being digital
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/101—Monitoring; Testing of transmitters for measurement of specific parameters of the transmitter or components thereof
- H04B17/104—Monitoring; Testing of transmitters for measurement of specific parameters of the transmitter or components thereof of other parameters, e.g. DC offset, delay or propagation times
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/11—Monitoring; Testing of transmitters for calibration
- H04B17/12—Monitoring; Testing of transmitters for calibration of transmit antennas, e.g. of the amplitude or phase
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
The invention discloses a transmitting assembly of a Ka-frequency-band phased array antenna, and belongs to the technical field of phased array antennas. The component comprises a peak detection circuit, a power divider and a transmitting branch circuit, wherein the peak detection circuit, the power divider and the transmitting branch circuit are sequentially connected in series, and the transmitting branch circuit is used for realizing the functions of amplitude-phase control, power amplification and polarization selection of satellite communication transmitting signals; and a numerical control delayer is also connected between the power divider and the peak wave reduction circuit. The satellite communication phased array antenna is applied to the satellite communication phased array antenna, and can realize the functions of amplitude control, phase control, power amplification and the like of satellite communication transmitting signals.
Description
Technical Field
The invention relates to the technical field of phased array antennas, in particular to a transmitting assembly of a Ka frequency band phased array antenna.
Background
The transmitting component plays a vital role in an active phased array antenna system, a Ka frequency band phased array antenna for satellite communication adopts a broadband frequency hopping system, and the phased array antenna generally adopts a phase shifter to realize beam scanning under the condition of narrow band; under the condition of broadband scanning, if a phase shifter is still adopted, a beam offset phenomenon can be generated, namely the beam directions of a low-frequency point and a high-frequency point are not coincident, so that the instantaneous bandwidth of the phased array antenna is limited.
In addition, the transmitting assembly is used as a key component of the phased array antenna, so that the power consumption is high, the heat productivity is large, the failure occurrence rate is high, and the transmitting assembly is a weak link of the whole link; and the transmitting assembly undertakes high power amplification of the transmitted signal, affecting the destructive failure of the phased array antenna. In order to avoid the phased array antenna from being paralyzed due to the failure of too many transmitting assemblies, a certain ratio of backup is reserved for the transmitting assemblies to replace the failed assemblies or the failed assemblies are periodically maintained during the previous design. The former causes problems of increased antenna cost, increased weight, pattern offset, and the like; the latter requires accurate positioning of the failed component, otherwise troubleshooting one by one is costly in time.
In an active phased array antenna system, the number of transmitting components is large, the cost is high, and the active phased array antenna system is a key device of the system and belongs to a key monitoring object. At present, the control chip in the transmitting component simply converts the control data in serial-parallel mode, and does not feed back the control code.
Disclosure of Invention
In view of the above, the present invention provides a Ka band phased array antenna transmitting assembly. The assembly is applied to a satellite communication phased array antenna, and can realize the functions of amplitude control, phase control, power amplification and the like of satellite communication transmitting signals.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a Ka frequency band phased array antenna transmitting assembly comprises a peak detection circuit, a power divider and a transmitting branch circuit, wherein the peak detection circuit, the power divider and the transmitting branch circuit are sequentially connected in series, and the transmitting branch circuit is used for realizing amplitude-phase control, power amplification and polarization selection functions of satellite-borne transmitting signals; and a numerical control delayer is also connected between the power divider and the peak detection circuit.
Furthermore, the transmitting branch comprises a numerical control phase shifter, a numerical control attenuator, a driving amplifier and a final-stage amplifier which are sequentially connected in series; the other end of the final amplifier is connected with the input end of the single-pole double-throw switch; two output ends of the single-pole double-throw switch are respectively connected with the left-hand circularly polarized channel and the right-hand circularly polarized channel and are connected with the orthogonal double-linear polarized antenna unit array through a 90-degree electric bridge.
Furthermore, the device also comprises a control and feedback circuit; the first output end of the control and feedback circuit is connected with the numerical control delayer, the second output end of the control and feedback circuit is connected with the input end of the single-pole double-throw switch, and the first input end of the control and feedback circuit is connected with the peak detection circuit; the first bidirectional interface of the control and feedback circuit is connected with the numerical control attenuator, and the second bidirectional interface of the control and feedback circuit is used for being connected with an external upper computer.
Further, after the Ka frequency band transmitting signal enters the peak detection circuit, the peak detection circuit detects the input power in real time; in the detection process, once the input power is over-excited, the peak detection circuit sends a signal to the control and feedback circuit, and the numerical control attenuator further reduces the input signal so as to protect the final amplifier;
after a Ka frequency band transmitting signal enters a numerical control delayer from a peak detection circuit, the propagation delay between antenna units is adjusted through an implementation delay circuit of the numerical control delayer; after passing through a power divider, the signal after delay compensation enters a driving amplifier after being subjected to phase modulation by a numerical control phase shifter and amplitude modulation by a numerical control attenuator, and the signal power is amplified to an output power value required by an antenna unit through a final-stage power amplifier; the amplified signals selectively enter a left-hand circular polarization channel or a right-hand circular polarization channel through a single-pole double-throw switch, then form left-hand circular polarization or right-hand circular polarization by a 90-degree electric bridge, and finally are radiated into space through an antenna unit to form corresponding circular polarization electromagnetic waves.
Further, the control and feedback circuit controls and feeds back the working states of a numerical control phase shifter, a numerical control attenuator, a single-pole double-throw switch and a numerical control time delay device in the transmitting branch circuit according to an external control and query instruction; and adjusting the attenuation state of the numerical control attenuator in the transmitting branch according to the output signal of the peak detection circuit.
Furthermore, the control and feedback circuit comprises a buffer memory, a serial-parallel conversion register and a singlechip which are sequentially connected in series; the other end of the buffer memory is respectively connected with a control port of the numerical control phase shifter, a control port of the numerical control attenuator, a port of the single-pole double-throw switch and a port of the numerical control delayer through the multi-way switch.
The invention adopts the technical scheme to produce the beneficial effects that:
phased array antennas typically employ phase shifters to control the beam sweep, and the phase shifters are usually weighted at the signal center frequency to control the pointing direction of the antenna beam. When a signal has a certain bandwidth, the frequency of the signal deviates from the center frequency, and when the frequency of the signal changes, if the weight of the phase shifter is not changed, the direction of the controlled beam deviates. In the design of the invention, the beam deviation phenomenon caused by dispersion during wide-angle scanning of the phased array antenna broadband is avoided by adopting the delayer technology among the sub-arrays, but the insertion loss of the delayer is larger, so that the numerical control phase shifter is still adopted in the sub-arrays to realize the phase weighting of the narrow-band signals.
At the transmitting excitation port, if the maximum power value of the input is too large, the fault or permanent failure of the final-stage power amplifier is easily caused. In the design of the invention, a peak detection circuit is adopted to monitor the input power value in real time, once power overdriving is found, a control and feedback circuit can trigger a power attenuation device to reduce the input signal, and the overdriving protection of the final power amplifier is realized.
In the design of the invention, the control and feedback circuit also has the function of controlling code feedback, can quickly and accurately position the phase abnormal channel and overcomes the defects of the prior art.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a simulation diagram of pointing error according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of the control and feedback circuit of fig. 1.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments.
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
A Ka frequency band phased array antenna transmitting assembly comprises a peak detection circuit, a power divider and a transmitting branch circuit, wherein the peak detection circuit, the power divider and the transmitting branch circuit are sequentially connected in series, and the transmitting branch circuit is used for realizing amplitude-phase control, power amplification and polarization selection functions of satellite-borne transmitting signals; and a numerical control delayer is also connected between the power divider and the peak detection circuit.
Furthermore, the transmitting branch comprises a numerical control phase shifter, a numerical control attenuator, a driving amplifier and a final-stage amplifier which are sequentially connected in series; the other end of the final amplifier is connected with the input end of the single-pole double-throw switch; two output ends of the single-pole double-throw switch are respectively connected with the left-hand circularly polarized channel and the right-hand circularly polarized channel and are connected with the orthogonal double-linear polarized antenna unit array through a 90-degree electric bridge.
Furthermore, the device also comprises a control and feedback circuit; the first output end of the control and feedback circuit is connected with the numerical control delayer, the second output end of the control and feedback circuit is connected with the input end of the single-pole double-throw switch, and the first input end of the control and feedback circuit is connected with the peak detection circuit; the first bidirectional interface of the control and feedback circuit is connected with the numerical control attenuator, and the second bidirectional interface of the control and feedback circuit is used for being connected with an external upper computer.
Further, after the Ka frequency band transmitting signal enters the peak detection circuit, the peak detection circuit detects the input power in real time; in the detection process, once the input power is over-excited, the peak detection circuit sends a signal to the control and feedback circuit, and the numerical control attenuator further reduces the input signal so as to protect the final amplifier;
after a Ka frequency band transmitting signal enters the numerical control delayer from the peak detection circuit, the propagation delay between the antenna units is adjusted through an implementation delay circuit of the numerical control delayer; after passing through a power divider, the signal after delay compensation enters a driving amplifier after being subjected to phase modulation by a numerical control phase shifter and amplitude modulation by a numerical control attenuator, and the signal power is amplified to an output power value required by an antenna unit through a final-stage power amplifier; the amplified signals selectively enter a left-hand circular polarization channel or a right-hand circular polarization channel through a single-pole double-throw switch, then form left-hand circular polarization or right-hand circular polarization by a 90-degree electric bridge, and finally are radiated into space through an antenna unit to form corresponding circular polarization electromagnetic waves.
Further, the control and feedback circuit controls and feeds back the working states of a numerical control phase shifter, a numerical control attenuator, a single-pole double-throw switch and a numerical control delayer in the transmitting branch circuit according to an external control and query instruction; and adjusting the attenuation state of the numerical control attenuator in the transmitting branch according to the output signal of the peak detection circuit.
Furthermore, the control and feedback circuit comprises a buffer memory, a serial-parallel conversion register and a singlechip which are sequentially connected in series; and the other end of the buffer memory is respectively connected with a control port of the numerical control phase shifter, a control port of the numerical control attenuator, a port of the single-pole double-throw switch and a port of the numerical control delayer through a multi-way switch.
The following is a more specific example:
when the Ka-band satellite communication phased-array antenna works in a frequency hopping mode, frequency switching needs to be carried out in a transmitting frequency band according to a frequency hopping instruction, and in order to reduce table lookup and phase distribution time, beam pointing is kept consistent as much as possible when a broadband works. According to simulation of fig. 2, when the scanning angle of the Ka-band (27.5 GHz-31.0 GHz) phased array antenna is 60 °, if no delayer is added to the sub-array stage and only a phase shifter is adopted in the sub-array stage, when the antenna works in a 3.5GHz bandwidth, the directional deviation of high and low frequency beams is about 3 degrees, and the side frequency gain is about 2dB lower than the central frequency gain, which has a large influence on the system performance. Therefore, the design considers the adoption of a subarray-level delayer technology to realize the non-deviation pointing of broadband beams during wide-angle scanning.
Referring to fig. 1 to 3, an eight-channel transmission assembly of a Ka band phased array antenna for satellite communication includes: the device comprises a peak detection circuit, a numerical control delayer, an one-to-eight power divider, an amplitude-phase multifunctional chip, a driving amplifier, a final power amplifier, a single-pole double-throw switch, a 90-degree electric bridge and a control and feedback circuit.
An externally input Ka frequency band transmitting signal enters the assembly, firstly, the input power value is monitored in real time through a peak detection circuit, once power overdriving is found, a control and feedback circuit triggers a numerical control attenuator in an amplitude-phase multifunctional chip to reduce the input signal, and the purpose of protecting a final-stage power amplifier is achieved; then the signal enters a numerical control delayer, and the propagation delay among the subarrays is adjusted through a real-time delay circuit; the signal after the time delay compensation enters an amplitude-phase multifunctional chip through an one-to-eight power divider, enters a driving amplifier after being subjected to phase modulation by a numerical control phase shifter and amplitude modulation by a numerical control attenuator, and is amplified to an output power value required by the phased array antenna through a final power amplifier; amplified signals selectively enter a left-hand circular polarization channel or a right-hand circular polarization channel through a single-pole double-throw switch, then form left-hand or right-hand circular polarization through a 90-degree electric bridge, and finally radiate the signals into space through a pair of orthogonal horizontal polarization x antenna units and vertical polarization x antenna units to form corresponding circular polarization electromagnetic waves.
The peak detection circuit is used for power amplifier over-excitation protection. At a transmitting excitation port, if the input maximum power value exceeds a designed value by 15dB and a transmitting link is not provided with a protection circuit, the fault or permanent failure of a final-stage power amplifier is easily caused. Therefore, for the over-excitation protection, a peak detection circuit can be adopted to monitor the input power value in real time, once the power over-excitation is found, the control and feedback circuit can trigger a numerical control attenuator in the amplitude-phase multifunctional chip to reduce the input signal, and the purpose of protecting the final power amplifier is achieved.
The numerical control time delay is used for compensating transmission delay between the sub-arrays. Under the narrow-band condition, the phased array antenna generally adopts a phase shifter to realize beam scanning; under the condition of broadband scanning, if a phase shifter is still adopted, a beam offset phenomenon can be generated, namely the beam directions of a low-frequency point and a high-frequency point are not coincident, so that the instantaneous bandwidth of the phased array antenna is limited. Therefore, under the condition of wide-band and wide-angle scanning, the phase shifter is adopted in the sub-arrays to adjust the phase, and the real-time delay circuit is adopted between the sub-arrays to adjust the propagation delay between the sub-arrays. In the design, a GaAs MMIC 3-bit numerical control delay line chip is adopted, 1, 2 and 4 wavelength three-bit delay lines are designed according to the central frequency, the maximum real-time delay range is 1250ps, and 0V/-5V logic control is adopted. After the delayer is adopted, when the frequency hopping works, the directional consistency of the in-band wave beam can be kept without changing the phase shift value in the same wave beam direction, and the flatness of the in-band gain fluctuation is ensured.
The one-to-eight power divider 03 is used for dividing the equal power of the transmission signals entering the sub-array into 8 parts, and the 8 parts respectively enter eight transmission branches or transmission channels. In the design, when the power of the input port of the power divider is 20dBm, eight power dividersThe power respectively obtained by the emission channels is about 8dBm, the power after passing through the amplitude-phase multifunctional chip and the drive amplifier is about 2dBm, and the final-stage power amplifier is in P -1 The output power is 23 dBm.
The amplitude-phase multifunctional chip is used for amplitude modulation and phase modulation between internal channels of the phased-array antenna subarray. In the design, a 6-digit numerical control phase shifter is integrated in the amplitude-phase multifunctional chip, the stepping is 5.625 degrees, and the maximum phase shifting range is 354.375 degrees; a6-digit digital control attenuator is integrated, the stepping is 0.5dB, and the maximum attenuation range is 31.5 dB.
The driving amplifier is an automatic gain control amplifier and is used for adjusting the consistency of the in-band amplitudes of the eight transmitting channels and compensating the discreteness of the gains of the amplifiers among the channels.
The P-1 output power of the final-stage power amplifier is 23dBm, and the gain is 22 dB; when P-1 is output, the power consumption is 5V/150mA, and the efficiency is 26.7%.
The single-pole double-throw switch is used for switching left-hand polarization and right-hand polarization.
The 90-degree bridge is used for realizing circular polarization. Electromagnetic waves of arbitrary polarization in space can be synthesized by a pair of orthogonal linearly polarized waves with different amplitude ratios and phase differences. When the dual linear polarization antenna is adopted to synthesize circular polarization, if the amplitude ratio is controlled to realize, the theoretical maximum synthesis loss is 3 dB; if the phase difference is controlled, the synthesized power is theoretically lossless. This is a technical advantage for the overall performance of the system, especially for reducing transmit power consumption. Therefore, the circular polarization is realized by adopting a 90-degree electric bridge mode and controlling the phase difference of the double linear polarization.
The control and feedback circuit 04 controls and feeds back the working states of the numerical control phase shifters, the numerical control attenuators, the single-pole double-throw switches and the numerical control delayers 02 in the amplitude-phase multifunctional chips in the eight transmitting channels according to an external control and query instruction; and adjusting the attenuation states of the numerical control attenuators in the amplitude-phase multifunctional chips in the eight transmitting channels according to the output signal of the peak detection circuit 01.
Claims (2)
1. A Ka frequency band phased array antenna transmitting assembly comprises a peak detection circuit, a power divider and a transmitting branch circuit, wherein the peak detection circuit, the power divider and the transmitting branch circuit are sequentially connected in series, and the transmitting branch circuit is used for realizing the functions of amplitude-phase control, power amplification and polarization selection of satellite communication transmitting signals; the power divider is characterized in that a numerical control delayer is also connected between the power divider and the peak detection circuit;
the transmitting branch comprises a numerical control phase shifter, a numerical control attenuator, a driving amplifier and a final amplifier which are sequentially connected in series; the other end of the final amplifier is connected with the input end of the single-pole double-throw switch; two output ends of the single-pole double-throw switch are respectively connected with the left-hand circularly polarized channel and the right-hand circularly polarized channel and are connected with the orthogonal double-linear polarized antenna unit array through a 90-degree electric bridge;
the device also comprises a control and feedback circuit; the first output end of the control and feedback circuit is connected with the numerical control delayer, the second output end of the control and feedback circuit is connected with the input end of the single-pole double-throw switch, and the first input end of the control and feedback circuit is connected with the peak detection circuit; a first bidirectional interface of the control and feedback circuit is connected with the numerical control attenuator, and a second bidirectional interface of the control and feedback circuit is used for connecting an external upper computer;
after the Ka frequency band transmitting signal enters a peak detection circuit, the peak detection circuit detects the input power in real time; in the detection process, once the input power is over-excited, the peak detection circuit sends a signal to the control and feedback circuit, and the numerical control attenuator further reduces the input signal so as to protect the final amplifier;
after a Ka frequency band transmitting signal enters the numerical control delayer from the peak detection circuit, the propagation delay between the antenna units is adjusted through an implementation delay circuit of the numerical control delayer; after passing through a power divider, the signal after delay compensation enters a driving amplifier after being subjected to phase modulation by a numerical control phase shifter and amplitude modulation by a numerical control attenuator, and the signal power is amplified to an output power value required by an antenna unit through a final-stage power amplifier; the amplified signals selectively enter a left-hand or right-hand circularly polarized channel through a single-pole double-throw switch, then form left-hand or right-hand circularly polarization by a 90-degree electric bridge, and finally are radiated into space through an antenna unit to form corresponding circularly polarized electromagnetic waves;
the control and feedback circuit controls and feeds back the working states of a numerical control phase shifter, a numerical control attenuator, a single-pole double-throw switch and a numerical control delayer in the transmitting branch circuit according to an external control and query instruction; and adjusting the attenuation state of the numerical control attenuator in the transmitting branch according to the output signal of the peak detection circuit.
2. The transmitting assembly of a Ka-band phased array antenna of claim 1, wherein the control and feedback circuit comprises a buffer memory, a serial-to-parallel conversion register and a single chip microcomputer which are connected in series in sequence; and the other end of the buffer memory is respectively connected with a control port of the numerical control phase shifter, a control port of the numerical control attenuator, a port of the single-pole double-throw switch and a port of the numerical control delayer through a multi-way switch.
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| US7071873B2 (en) * | 2004-04-30 | 2006-07-04 | The United States Of America As Represented By The Secretary Of The Air Force | T/R module for satellite TT and C ground link |
| CN111614372A (en) * | 2020-06-15 | 2020-09-01 | 中国电子科技集团公司第五十四研究所 | Ku frequency band phased array antenna transceiving component for satellite communication |
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| JP2012222523A (en) * | 2011-04-06 | 2012-11-12 | Hitachi Chem Co Ltd | Antenna scanning device and radio communication system using the same |
| CN105449362A (en) * | 2015-12-17 | 2016-03-30 | 中国电子科技集团公司第五十四研究所 | Double-star and double-beam phased-array antenna for S-frequency band satellite communication |
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| CN110112566A (en) * | 2019-04-23 | 2019-08-09 | 西安空间无线电技术研究所 | A kind of phased array antenna system of big broadband high radiation efficiency |
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