In a filter having a plurality of resonators (31, 32) electromagnetically coupled with each other, a multi-layer circuit board (33) is attached to one end in the longitudinal direction of the resonators (31, 32). Interstage circuit elements constituting a part of the filter components along with input...http://www.google.com/patents/US5304967?utm_source=gb-gplus-sharePatent US5304967 - Multi-layer circuit board dielectric filter having a plurality of dielectric resonators
