BANDPASS FILTER

摘要

A bandpass filter includes a first uniform impedance resonator comprising a first microstrip line and a second microstrip line, a second uniform impedance resonator which is axisymmetric to the first uniform impedance resonators, a first asymmetric stepped-impedance resonator comprising a third microstrip line and a fourth microstrip line, a second asymmetric stepped-impedance resonator which is axisymmetric to the first asymmetric stepped-impedance resonator, a third asymmetric stepped-impedance resonator consisting of a fifth microstrip line and a sixth microstrip line, a fourth asymmetric stepped-impedance resonator which is axisymmetric to the third asymmetric stepped-impedance resonator, a input consisting of a seventh microstrip line and connecting with the first microstrip line, and a output which is axisymmetric to the input and connects with the second uniform impedance resonator.

主权项

1. A bandpass filter comprising:
a first impedance resonator, comprising a first microstrip line and a second microstrip line, wherein the first microstrip line is perpendicular to the second microstrip line and forms a “T” shape with the second microstrip line; a second impedance resonator which is axisymmetric to the first impedance resonator; a first asymmetric stepped-impedance resonator located on one side of the first microstrip line, comprising a third microstrip line and a fourth microstrip line; a second asymmetric stepped-impedance resonator which is axisymmetric to the first asymmetric stepped-impedance resonator and is located on one side of the first microstrip line; a third asymmetric stepped-impedance resonator located on the other side of the first microstrip line, comprising a fifth microstrip line and a sixth microstrip line; a fourth asymmetric stepped-impedance resonator which is axisymmetric to the third asymmetric stepped-impedance resonator and is located on the other side of the first microstrip line; an input portion, comprising a seventh microstrip line and connecting with the first microstrip line; and an output portion which is axisymmetric to the input portion and connects with the second impedance resonator.