Premium
New microstrip diplexers using open‐loop ring resonators with two transmission zeros
Author(s) -
Hsieh LungHwa,
Chang Kai
Publication year - 2005
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.20647
Subject(s) - diplexer , passband , resonator , band pass filter , electronic engineering , microstrip , microwave , transmission (telecommunications) , filter (signal processing) , topology (electrical circuits) , engineering , telecommunications , physics , electrical engineering
This paper presents a diplexer with good isolation constructed by two high‐selectivity bandpass filters. The high‐selectivity filter is designed by an asymmetrically fed structure that shows two transmission zeros next to the passband of the filter. By using a simple equation, the locations of the transmission zeros are designed at the passbands of the filters in order to filter out unwanted signals and obtain good isolation for the diplexer. The insertion loss of the diplexer is less than 2.2 dB and the isolation is greater than 41 dB. This high‐performance diplexer can be used in many wireless communication systems. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 44: 396–398, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20647