Design and analysis of UWB band pass filter with ring filterTHlA-5 Design and Analysis of UVVB Bandpass Filter with Ring Filter Hitoshi Ishida and Kiyomichi Araki Tokyo Institute of Technology, 2-12- 1 Oh-okayama, Meguro-ku, Tokyo, Japan Abstract - To realize an Ultra Wideband (UWB) bandpass filter (BPF) in wireless communications[l], a s developed using a new Ring Filter. The Ring Filter device i is compact, with low insertion loss, sharp rejection and a constant group delay within the U W B passband. The Ring Filter is made to control the attenuation pole frequency by adjusting both the ring and the stub impedance. A center frequency and a bandwidth of the Sstage U W B BPF are designed based on the transmission line model. The circuit conditions of two attenuation poles at either side of the passband are given together with controlling them. In……