Coaxial filter with elongated resonator

摘要

A microwave filter has a housing defining an inner cavity. A first resonator is positioned in a first portion of the inner cavity. A second resonator is positioned in a second portion of the inner cavity. A third resonator is positioned in a third portion of the inner cavity. The first resonator and the third resonator are cross-coupled via an iris. The second resonator is elongated and is coupled to the first resonator and the third resonator. The resulting microwave filter has a frequency response having a transmission zero in the lower stopband. A high-pass filter is realized without the use of a cross-coupling probe.

主权项

1. A microwave filter comprising:
a housing defining an inner cavity, the housing comprising a housing floor; a first resonator positioned in a first portion of the inner cavity, the first resonator being fixed to the housing floor, the first resonator being coupled to a first connector port; a third resonator positioned in a third portion of the inner cavity, the third resonator being fixed to the housing floor, the third resonator being coupled to a second connector port and cross-coupled with the first resonator; and a second resonator positioned in a second portion of the inner cavity, the second resonator being fixed to the housing floor, the second resonator being elongated and being coupled to the first resonator and the third resonator.