Microwave filter with resonator between parallel plates - has bypass coupling between some resonators rated for compensation of pass characteristic asymmetry

摘要

At least three resonators, mounted in series in the wave propagation direction between parallel plates, form the microwave filter and are in the form of suitable pins. Their inductive and capacitive coupling is determined by their spacing. At least one bypass coupling is provided between two resonators not immediately adjacent. The bypass coupling is so rated that the asymmetry of the filter pass characteristic is compensated. This asymmetry is produced by undesirable inductive coupling between not adjacent resonators. If at least four resonators are used, at least two capacitive additional couplings are provided between not adjacent resonators to make the design symmetric.