Patent ID: 7321278
Filing Date: 2008-01-22
Classification: H01P

Abstract:
1. A communication filter comprising: a dielectric block having a first and a second end portion and a central portion therebetween, the dielectric block having a top surface, a bottom surface and a plurality of through-holes each extending between an opening on the top surface and an opening on the bottom surface; a first and a second antenna coupling area located on the top surface of the block; a transmitter coupling pad on the block; a receiver coupling pad on the block; a plurality of coupled resonators provided by a first set of the plurality of through-holes and extending through the block between the top and bottom surfaces a trap resonator provided by at least one of the plurality of through-holes and extending through the block between the top and bottom surfaces and located in the central portion between the first and the second antenna coupling areas, the trap resonator providing attenuation outside of a desired passband; and a decoupler provided by at least a second one of the plurality of through-holes and extending through the block between the top and bottom surfaces and located in the central portion. the trap resonator being located between the decoupler and one of the first and second antenna coupling areas.