Design of Cross-Coupled Cavity Filter Based on Coupling Matrix Synthesis Method
The N+2 coupling matrix of the filter is synthesized by constructing the short-circuit admittance matrix through the polynomial method and the circuit method.A fourth order cross-coupled cavity filter is taken as an example,and the circuit simulation in ADS is used to verify the correctness of the coupling matrix synthesis.Then,the full-wave simulation model of the filter is established in HFSS,and the curve fitting method is used to optimize it,which greatly reduces the debugging time and improves the design efficiency.Accord-ing to the measured results,the insertion loss of the filter in the passband(1 371 MHz-1 413 MHz)is less than 0.1 dB,and the standing wave ratio is less than 1.725,which can basically meet the requirements of the performance index.
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