Open AccessDesign of Balanced Dual‐Band Bandpass Filter with Self‐Feedback Structure
Author(s) -
Chen Xinwei,
Han Guorui,
Ma Runbo,
Gao Jiangrui,
Zhang Wenmei
Publication year - 2009
Publication title -
etri journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 46
eISSN - 2233-7326
pISSN - 1225-6463
DOI - 10.4218/etrij.09.0209.0062
Subject(s) - band pass filter , resonator , electrical impedance , filter (signal processing) , multi band device , insertion loss , dual mode , transmission (telecommunications) , electronic engineering , materials science , optoelectronics , engineering , electrical engineering , antenna (radio)
A balanced dual‐band bandpass filter based on λ/2 stepped‐impedance resonators and open‐loop resonators is proposed in this letter. By employing a type of self‐feedback structure, an extra transmission zero is introduced near the common‐mode resonance frequency, and the common‐mode signal is suppressed. The measured results indicate that the filter can operate in 2.46 GHz and 5.6 GHz bands, and the insertion loss is 1.85 dB and 1.9 dB, respectively. Also, better common‐mode suppression is achieved.