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Miniaturized multilayer hairpin bandpass filter with tunable transmission zeros
Author(s) -
Weng MinHung,
Huang TsungHui,
Chang JeeGong,
Hung ChengYuan,
Dai BunTong
Publication year - 2004
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.20044
Subject(s) - band pass filter , passband , return loss , insertion loss , microwave , coupling (piping) , materials science , filter (signal processing) , transmission line , electronic engineering , center frequency , optoelectronics , topology (electrical circuits) , engineering , electrical engineering , telecommunications , antenna (radio) , metallurgy
A miniaturized multilayer hairpin bandpass filter using tapped‐line I/O with tunable transmission zeros is designed and implemented. This structure provides additional cross‐coupling between two layers, as well as the coupling effect on the same layer. The designed filter demonstrates superior passband characteristics with a central frequency f 0 = 2.39 GHz, insertion loss S 21 = −1.45 dB and a return loss S 11 = −32 dB. Moreover, by combining with two layers and tapped‐line I/O structure, the filter produces two tunable transmission zeros at 2.8 GHz with −48 dB and 3.2 GHz with −43‐dB rejection that the typical elliptic function response can be easily. Experimental results of the fabricated filter measured by network analyzer agree well with the simulation results. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 41: 53–55, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20044