UMTS DIPLEXER DESIGN USING THE ANTIPARALLEL-COUPLED LINES LOADED WITH A STEPPED IMPEDANCE RESONATOR

作者：Ho Min Hua^*; Lin Wei Chen

来源：Microwave and Optical Technology Letters, 2011, 53(12): 2988-2990.

DOI：10.1002/mop.26421

• UMTS diplexer
• antiparallel-coupled lines
• mid-passband zero implantation
• spurline

We present a novel UMTS diplexer design using the filters of antiparallel-coupled lines structure loaded with a stepped impedance microstrip resonator. The diplexer is composed of two filters. And a microstrip line of quarter-wavelength is used to links each filter to the common port. The composing filters exhibit two tunable transmission zeros which are used to implement the mid-passband zero implantation for improving the isolation between the transmitting (Tx) and the receiving (Rx) ports. A pair of spurlines is used in the coupled lines of the Tx-filter to further increase the isolation. An experiment is conducted to assure the diplexer's performance and to verify the circuit design.

• 出版日期2011-12