Abstract：To meet the needs of up converters for low insertion loss and high suppression filters, an H-plane iris band-pass filter at V-band was designed and fabricated. This filter was composed of six rectangular resonant cavities, which were connected together by series. The initial size values of six resonant cavities and seven coupling windows were obtained through theoretical calculations. The filter structure was modeled and optimized using three-dimensional electromagnetic simulation software HFSS. The sample filter was fabricated and measured. The measured results show that the insertion loss is less than 0.6 dB, the return loss is better than 15.6 dB between 47.2 GHz and 50.2 GHz. The stop-band suppression is 73.8 dBc at 42.6 GHz and 52.8 dBc at 54.8 GHz. The measured results are consistent with the simulation results.

Abstract：This paper introduces an engineering realization of a Ku-band miniaturized airtight power amplifier. Using 4 GaN power chips and 1 GaAs driver chips, the power is synthesized by combining a microstrip ring power divider/combiner with waveguide power divider/combiner/ synthesizer network. The continuous wave saturated output power at 13~15 GHz is greater than 120 W. the power amplifier uses a forced air cooling solution with a finned heat sink, which improves the heat sink’s heat dissipation efficiency and provides good heat dissipation performance. The technical condition of the power amplifier is stable, its reliability and practicality meet the requirements for engineering use, and it is suitable for microwave transmission systems in field such as telemetry, communication, and electronic warfare.

Abstract：This paper presents the design of a high-gain substrate integrated waveguide (SIW) circularly polarized antenna operating in the Ka-band, utilizing a quadruple-ridged waveguide as the circular polarization radiator. To validate the design, a 4×4 circularly polarized array antenna was developed, featuring a three-layer dielectric substrate structure: the top layer consists of a 4×4 quadruple-ridged waveguide circular polarization radiator, the middle layer comprises a 4×4 cavity-backed slot antenna array operating in the TE110 mode, and the bottom layer incorporates a T-shaped SIW-based one-to-eight power divider. Measurement results demonstrate that the array antenna achieves an S11<-10 dB bandwidth from 35.3 GHz to 35.55 GHz, a 3 dB axial ratio bandwidth from 35.24 GHz to 35.57 GHz, and a peak gain of 18.14 dBi at 35.42 GHz. The proposed design innovatively employs a quadruple-ridged waveguide to achieve circular polarization, offering high aperture efficiency and a compact structure, making it suitable for microwave and millimeter-wave systems.

Abstract：In order to meet the requirements of complex electromagnetic environment testing and receiver's ultra-wideband, large instantaneous bandwidth, miniaturization and adjustability, this paper designs a receiver RF front-end module with 1.5 GHz~18 GHz ultra-wideband RF signal reception, 1 GHz large instantaneous bandwidth, large dynamic range and ultra-low receiving sensitivity, and it also has the function of outputting intermediate frequency and bandwidth. Through the test, the module is verified and the results meet the design requirements.