A MINIATURIZED END-COUPLED BANDPASS FILTER

A miniaturized end-coupled bandpass filter is realized by U4 hair-pin coplanar resonators. Attenuation poles at both-side of the passband are generated by resonators arrangement to make multi-pass circuit. The trial filter has 590MHz 3dEbbandwidth at 5.8GHz and the insertion loss is 3.8dB. The size is 3.5~3.75~0.4"~. It is applicable to MCM(mu1ti-chip-module) by bare-chip mount.