A dual-band filter using coupled-feed with asymmetrical stepped-impedance resonator

摘要

In this paper, a dual-band filter using coupled-feed with asymmetrical stepped-impedance resonator is proposed to develop the microstrip open loop resonators dual-band filter. The dual-band filter is based upon the design of two filters independently; one of them meeting the desired performance at 900MHz and the other desired performance at 1800MHz. The two filters can be combined using the coupled feed lines. The measured insertion losses are better than 3.0 dB for the two channels. It is very useful for applications in mobile communication systems.