EBG-Embedded Multiple-Mode Resonator for UWB Bandpass Filter With Improved Upper-Stopband Performance

Author

Wong, Sai Wai ; Zhu, Lei

Author_Institution

Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore

Volume

17

Issue

6

fYear

2007

fDate

6/1/2007 12:00:00 AM

Firstpage

421

Lastpage

423

Abstract

An electromagnetic bandgap (EBG) embedded multiple-mode resonator (MMR) is proposed to constitute an upper-stopband-improved and size-miniaturized ultra-wideband (UWB) bandpass filter (BPF). This EBG-embedded MMR is studied to relocate its first three resonant modes within the 3.1-10.6GHz passband, whereas placing its 4th resonant mode at the coupling transmission zero of interdigital coupled-lines that drive this MMR at two sides. Meanwhile, the fifth resonant mode is rejected by virtue of the bandstop behavior of the EBG itself. Thus, a modified UWB BPF with widened upper-stopband, sharpened upper rejection skirt and lowered loss in the passband is finally constituted, designed and fabricated. The measured results demonstrate that the insertion loss is lower than 1.0 dB in the passband (4.0-10.6GHz) and higher than 15.0dB in the upper-stopband (12.0 to 20.0GHz) while the group delay variation in the passband is less than 0.2ns

Keywords

band-pass filters; microwave filters; photonic band gap; poles and zeros; resonator filters; 3.1 to 10.6 GHz; UWB bandpass filter; bandstop behavior; coupling transmission zero; electromagnetic bandgap; improved upper-stopband performance; interdigital coupled-lines; multiple-mode resonator; resonant mode; wide upper-stopband; Band pass filters; Couplings; Filtering theory; Insertion loss; Microstrip filters; Passband; Periodic structures; Resonance; Resonator filters; Ultra wideband technology; Bandpass filter (BPF); electromagnetic bandgap (EBG); multiple-mode resonator (MMR); ultra-wideband (UWB); wide upper-stopband;

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2007.897788

Filename

4220712