Compact DGS quad band filter for multi-service wireless communication systems using stub loaded stepped impedance resonators

摘要

This paper presents a compact dual-mode quad band micro-strip band-pass (BPF) and low pass (LPF) filter by using a stub-loaded stepped-impedance resonator (SIR) and a short-circuited stub-loaded uniform impedance resonator. Also, ring SIR geometry is introduced to miniature the size of this filter while maintaining excellent performance. The use of a stub resonator at the central point of the ring SIR can generate two resonant modes in two pass bands. For demonstration purposes, a quad-band filter for the applications of the WLAN/WiMAX/WLAN/UWB at 1.7/3.8/6.91/10.10, Worldwide Interoperability for Microwave Access at 3.8 GHz and wireless local area networks at 6.91 GHz and 10.10 GHz is designed, and fabricated.