W波段混合高阶模准椭圆波导滤波器研究OA

[Background]The W-band constitutes a critical atmospheric window in the millimeter-wave spectrum,with significant importance for advanced applications such as high-capacity communications,high-resolution imaging,and high-precision sensing.As essential components within core millimeter-wave transmitter and receiver systems,filters fundamentally determine transceiver performance.However,conventional designs frequently face challenges in simultaneously achieving high electrical performance and favorable manufacturability,representing a key obstacle in contemporary W-band filter development.[Purpose]This work aims to develop a low-loss,low-order,and readily fabricable waveguide quasi-elliptic bandpass filter for the W-band.The goal is to maximize structural simplicity while maintaining high performance,thereby addressing the requirements of next-generation highly integrated transceiver systems.[Methods]The proposed filter employs a novel H-plane offset magnetic coupling configuration,which simplifies the input-output coupling mechanism.Guided by quasi-elliptic filtering theory,transmission zeros are generated on both sides of the passband through the excitation of TE201/TE102 and TE301/TE102 hybrid modes in two respective resonant cavities,resulting in enhanced out-of-band suppression.The filter is implemented in a split-block architecture and fabricated via high-precision computer numerical control(CNC)milling.[Results]Measured results demonstrate an operational passband from 91.5 GHz to 98 GHz,corresponding to a 3 dB fractional bandwidth of 7%,with an in-band insertion loss as low as 0.4 dB and a return loss greater than 15 dB.Except for a slight deviation observed at the upper band edge,the experimental data show strong agreement with simulation,confirming the design's manufacturability,integration compatibility,and high-frequency performance.[Conclusions]A compact,low-loss W-band quasi-elliptic filter has been successfully realized using only two hybrid-mode cavities.The presented design exhibits notable advantages in terms of fabrication ease,integration suitability,and electrical performance,providing a viable solution for advanced millimeter-wave system applications.