Abstract：In this paper, a novel Fabry-Perot (F-P) resonator antenna with one-dimensional electronic beam-steering is designed. The antenna uses a square microstrip patch antenna fed by a coaxial probe as the radiator, and uses a reconfigurable partially reflective surface (PRS) loaded with PIN diodes to realize beam-steering. The designed reconfigurable PRS consists of 6×6 petal-type unit cells that are divided into two equal parts, Part 1 and Part 2, which are independently controlled by two control signals. Therefore, the switching state of each part of the PIN diode can be selectively adjusted. The designed antenna has three different radiation modes. The proposed antenna is designed and measured, and the measurement results show that the main beam of the antenna can be switched freely in +9°, 0° and -9° discrete states. The overlap impedance bandwidth (|S_11 |<-10 dB) in all states is 5.5% (5.43~5.74 GHz), with a maximum gain of 14.2 dBi.

Abstract：In response to the increasing demand for higher operating frequencies of satellite communication, a receiver operating in Extremely High Frequency (EHF) band which realized RF receive and down-conversion function is designed. The receiver includes waveguide-microstrip probe transition, low noise amplifier, microstrip filter, local oscillator circuits, mixer and feed circuits. The advantages of the receiver are low noise figure, high gain and high out-of-band rejection. The receiver also utilizes Monolithic Microwave Integrated Circuit (MMIC) hybrid multifunctional integration technology to realize miniaturization and universalization, making it suitable for different EHF band transceiver front-end application with broad application prospects.

Abstract：This paper introduces an engineering realization of a C-band 2 000 W GaN high linear solid-state power amplifier. Using 32 GaN power transistor chips and using microstrip Gysel power dividers and waveguide power dividers/synthesis networks for power synthesis, the power amplifier has a continuous wave saturated output power greater than 2 000 watts and a maximum output power of 2 290 watts in the operating frequency band of 900 MHz. Radio frequency predistortion technology is applied, and the improvement of the third-order intermodulation is up to 4 dB, which is better than -29 dBc. A forced air cooling scheme is chosen for finned radiators with heat pipes to improve the heat transfer efficiency, and the heat dissipation performance is excellent. The power amplifier is equipped with comprehensive control and protection functions, the reliability and practicality of which meets the requirements of engineering use. The socket and power module adopt a hot swappable design, which is convenient for quick maintenance and suitable for microwave transmission system in fields such as measurement and control, communication and broadcasting.

Abstract：A low Radar Cross Section (RCS) microstrip antenna with composite reshaping technology is designed in this paper. The antenna RCS can be reduced with radiation performance maintained through simultaneously slotting along the patch and subtracting from the metal ground plate due to the area of the metallic part reduced. Compared with the traditional microstrip antenna, the antenna RCS reduction in the frequency band of 1~4 GHz with the maximum RCS reduction of 20 dB can be achieved based on this composite reshaping technology. The prototypes of designed antennas are fabricated and tested, and the test result verifies the correctness of the analysis.

Abstract：A low-profile, wideband, low Radar Cross Section (RCS) magneto-electric dipole array antenna is designed in this paper. The resonant characteristics of the antenna unit are studied from the perspective of radiation and scattering coupling, resulting in the construction of two different units with similar radiation performance but nearly opposite phase reflections for the cross-polarized incident waves. A wideband-matched sub-array with low scattering for the main polarized wave is formed by using the same unit and SIW differential feeding in the main polarization direction. Subsequently, the scattering phase cancellation for the cross-polarized incident waves is achieved by deploying the sub-array in a mirrored configuration, effectively reducing the RCS of the antenna. The antenna operates in the frequency range of 26.77 GHz to 34.35 GHz (24.8%) with a peak gain of 17.7 dBi. Compared with the reference array using the same type of unit, the proposed magnetoelectric dipole array achieves a reduction of -10 dB in cross-polarization RCS from 22.5 GHz to 34.5 GHz, without significant gain loss within the radiation band.