Title :
Compact ultra-wideband differential bandpass filter using self-coupled ring resonator
Author :
Hui Wang ; Yu-Qian Yang ; Wei Kang ; Wen Wu ; Kam-Weng Tam ; Sut-Kam Ho
Author_Institution :
Ministerial Key Lab. of JGMT, Nanjing Univ. of Sci. & Technol., Nanjing, China
Abstract :
A compact ultra-wideband differential bandpass filter (BPF) based on a self-coupled ring resonator is proposed. The self-coupled line contributes to not only three poles in differential-mode (DM) but also three zeros in common-mode (CM) offering both a wide differential passband and good CM suppression. A fabricated filter with a 3 dB fractional bandwidth of 118% for the DM and insertion loss greater than 18 dB for the CM has been designed and measured. This filter is only 30.4 × 1.0 mm (1.0λ0 × 0.03λ0) and it is only 15% of the size of the most reported differential BPFs. The simulated and measured results are in good agreement.
Keywords :
band-pass filters; interference suppression; poles and zeros; resonator filters; ultra wideband communication; BPF; CM suppression; DM; common-mode; compact ultra-wideband differential bandpass filter; differential passband filter; differential-mode; fabricated filter; fractional bandwidth; insertion loss; poles; self-coupled line; self-coupled ring resonator; zeros;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2013.1319
