Design of a novel stripline diplexer using frequency‐dependent couplings

Abstract

Abstract A novel stripline diplexer design using frequency‐dependent couplings (FDC) to achieve multiple transmission zeros is developed in this paper. The transmission zeros generated by FDCs are flexible and controllable; on the basis of the existing cross‐coupled, more transmission zeros are introduced to improve the frequency selection characteristics. Based on this characteristic, the authors synthesized and designed a 2.6‐GHz diplexer, its transmitting channel filter is five orders with three transmission zeros, and the receiving channel filter is four orders with three transmission zeros. The authors fabricated and measured it, in narrowband, the tested results, synthesis responses and simulation results are well matched with each other, which will provide more flexibility in the design of diplexers for wireless communication system.

Keywords

• filtering theory
• filters
• stripline filters