Summary
International Symposium on Antennas and Propagation
2006
Session Number:3D1b
Session:
Number:3D1b-4
EBG-Embedded UWB Bandpass Filter with Widened Upper-Stopband
Sai Wai Wong, Lei Zhu,
pp.1-4
Publication Date:2006/11/2
Online ISSN:2188-5079
Summary:
An EBG-embedded multiple-mode resonator (MMR) is proposed to constitute an upper-stopband-improved and sizeminiaturized ultra-wideband (UWB) bandpass filter on microstrip line. After the bandstop behaviour of such an EBG structure is characterized, a composite MMR is studied, aiming to relocate its first three resonant modes within the concerned UWB passband, i.e., 3.1-10.6GHz while placing its 4th resonant mode appearing at the coupling zero of interdigital coupled-lines. In addition, the 5th resonant mode is fully rejected by virtue of the distinct stopband behavior of the EBG itself. As such, a modified UWB bandpass filter with widened upper-stopband, sharpened upper rejection skirt and lowered transmission loss is finally constituted, designed and fabricated. The measured results show that the insertion loss is lower than 0.9dB in the UWB passband and higher than 15.0dB in the upper-stopband (11.4 to 20.0GHz) while the relevant group delay variation in the UWB is less than 0.2ns.