A Low Loss Dielectric Resonator Filter for Cellular and PCS Applications

摘要

Because of the growing need for increased capacity in cellular and PCS networks, low insertion loss and high out-of-band rejection are critical parameters for service providers to deliver cost-effective coverage. The use of complex digital modulation schemes to increase capacity also requires that a transmit filter exhibit a wide dynamic range; that is, it must be capable of handling moderate to high power levels while simultaneously maintaining high near-band rejection. Dielectric resonator filters are attractive for their low passband insertion loss. Through careful design and fabrication, a dielectric resonator filter has been designed that is capable of achieving very low passband insertion loss and high near-band rejection.