Patent ID: 7253704
Filing Date: 2007-08-07
Classification: H03H

Abstract:
1. A radio frequency (RF) duplexer comprising: a substrate; a first filter suspended over the substrate, and having a first plurality of resonators which are coupled in series and in parallel, passing a signal of a first frequency band; a second filter suspended over the substrate, and having a second plurality of resonators which are coupled in series and in parallel, passing a signal of a second frequency band different from the first frequency band; a plurality of inductors coupled in series with the parallel resonators of the first and second filters and formed on the substrate; a phase shifter formed on the substrate, preventing a signal interference between the first and second filters by introducing a phase difference between the signals input to the first and second filters; a supporter comprising a plurality of bumps supporting the first and second filters to electrically couple terminals of the first and second filter with terminals of the substrate; wherein the inductors are coupled to the plurality of bumps of the supporter, which are located at certain parts on the substrate, and the inductors are formed around the bumps.