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Microstrip bandpass filters for Ultra-Wideband (UWB) wireless communications

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3 Author(s)
Ching-Luh Hsu ; Dept. of Electron. Eng., Ta Hwa Inst. of Technol., Hsinchu, Taiwan ; Fu-Chieh Hsu ; Jen-Tsai Kuo

A new technique is developed for designing a composite microstrip bandpass filter (BPF) with a 3 dB fractional bandwidth of more than 100%. The BPF is suitable for ultra-wideband (UWB) wireless communications. The design utilizes embedding individually designed highpass structures and lowpass filters (LPF) into each other, followed by an optimization for tuning in-band performance. The stepped-impedance LPF is employed to attenuate the upper stopband and quarter-wave short-circuited stubs are used to realize the lower stopband. Two such BPFs are fabricated and measured to demonstrate the performance.

Published in:

Microwave Symposium Digest, 2005 IEEE MTT-S International

Date of Conference:

12-17 June 2005