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; a first resonator positioned in a first portion of the inner cavity; a third resonator positioned in a third portion of the inner cavity and being cross-coupled with the first resonator; a second resonator positioned in a second portion of the inner cavity, the second resonator being coupled to the first resonator and the third resonator; a fifth resonator positioned in a fifth portion of the inner cavity and being cross-coupled to the third resonator; and a fourth resonator positioned in a fourth portion of the inner cavity, the fourth resonator being elongated and being coupled with the third resonator and the fifth resonator, wherein an electric field at a first end of the elongated fourth resonator is out of phase with an electric field at a second end of the elongated fourth resonator.