Patent ID: 7071798

Claim:
A bandpass filter, comprising: a plurality of resonators that are electromagnetically coupled to each other, each resonator having a terminal coupled to a ground; a bypass line in parallel with said plurality of resonators, said bypass line having a bypass line input coupled to a first resonator of said plurality of resonators and a bypass line output coupled to a second resonator of said plurality of resonators; an input, coupled to said first resonator; and an output, coupled to said second resonator; said bypass line electromagnetically coupled to said first resonator at said bypass line input such that an outer segment of said first resonator is in parallel with, and in close proximity to, a first portion of said bypass line, said bypass line electromagnetically coupled to said second resonator at said bypass line output such that an outer segment of said second resonator is in parallel with, and in close proximity to, a second portion of said bypass line, and a third portion of said bypass line coupled between said first and second portions of said bypass line and electromagnetically isolated from at least one of said plurality of resonators between said first and second resonators.