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Design of sharp‐rejection, compact, and low‐cost ultra‐wideband bandpass filters using interdigital resonators
Author(s) -
Hung ChengYuan,
Weng MinHang,
Su YanKuin,
Yang RuYuan,
Wu HungWei
Publication year - 2006
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.21877
Subject(s) - passband , broadband , center frequency , band pass filter , bandwidth (computing) , resonator , wideband , insertion loss , microwave , materials science , ultra wideband , fractional bandwidth , electronic engineering , optoelectronics , electrical engineering , engineering , telecommunications
With the rapid development of broadband communications, sharp rejection and wide bandwidth are very important issues for UWB applications. In this article, a compact pseudo‐interdigital ultra‐wideband filter using the tapped input/output (I/O) and strong coupling is designed and implemented on FR4 substrate. This filter at center frequency f 0 of 3.9 GHz has presented almost very good measured characteristics, including the bandwidth of 3.1–4.8 GHz (3‐dB fractional bandwidth of 44%), low insertion loss of −1.6 dB, sharp rejection due to two transmission zeros in the passband edge created by interstage coupling, and low group delay varied between 0.2 and 0.5 ns. Experimental results of the fabricated filter show a good agreement with the predicted results. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2093–2096, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21877