Abstract: It designs a coaxial cavity band pass filter, achieving small size and high isolation with a new crosscoupling structure. It has been optimized and simulated by HFSS and microwave office software. The application of the method in design and cosimulation improves efficiency, especially for complex filters, and it greatly narrows the production cycle, thus saving cost. These excellent features, including small size, wide band, high isolation, low insertion make it a promising candidate in the future of wireless communication.

Key words: microwave bandpass filter; coaxial resonator； crosscoupling； cosimulation； transmission zeros