关键词: 宽带, 基片集成波导, 磁电偶极子, 滤波天线

Abstract: A broadband millimeter-wave substrate integrated waveguide (SIW) magnetoelectric dipole filtering antenna is proposed to address the issues of narrow operating bandwidth, insufficient out-of-band suppression, complex structure, and difficult processing of millimeter-wave filtering antennas. The antenna uses a magnetic electric dipole excited by an F-shaped probe loaded with an open circuit strip line as the radiation source. The equivalent capacitance of the open circuit branch is used to offset the equivalent inductance of the magnetic electric dipole, thereby widening the impedance bandwidth. The antenna mainly improves frequency selectivity by exciting the multi-mode resonant filtering of the square SIW cavity. The simulation results show that the center frequency of the antenna is 31.32 GHz, achieving a relative bandwidth of 31.2% in the size of 0.59λ₀ × 0.59λ₀ × 0.27λ₀. The average gain in the band is 6.4 dBi and flat, and the out-of-band suppression levels of the upper and lower stopbands are 27.4 dB and 18.4 dB, respectively. The proposed antenna has the characteristics of easy array formation while ensuring high selectivity and broadband performance, providing a new technical path for miniaturization and integration of millimeter-wave RF front-end.

Key words: broadband,  substrate integrated waveguide, magnetoelectric dipole, filtering antenna