Ultra-Wideband (UWB) Microstrip Bandpass Filters with Improved Upper-Stopband and Miniaturized Size

Author

Wong, Sai Wai ; Zhu, Lei

Author_Institution

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

fYear

2007

fDate

11-14 Dec. 2007

Firstpage

1

Lastpage

4

Abstract

An ultra-wideband (UWB) microstrip bandpass filter with improved upper-stopband and miniaturized size is presented. A modified multiple-mode resonator is formed by transversely attaching three pairs of non-uniform and folded stubs. Its configuration is then investigated, aiming to allocate the first three resonant frequencies within 3.1-10.6 GHz band while suppressing spurious harmonics at the upper-stopband. Plus, its high-impedance sections in two sides are linked with two feed lines via interdigital coupled lines, leading to make up an initial UWB filter. Then, two-stage UWB bandpass filter is constructed to sharpen the rejection skirt and deepen the upper-stopband. Finally, two filters are optimized, fabricated and measured to give us an evident confirmation on the improved UWB performance.

Keywords

band-pass filters; microstrip filters; microwave filters; resonators; UWB filter; interdigital coupled lines; multiple-mode resonator; resonant frequency; spurious harmonics; ultra-wideband microstrip bandpass filters; upper-stopband; Band pass filters; FCC; Feeds; Frequency; Insertion loss; Microstrip filters; Microstrip resonators; Passband; Resonator filters; Ultra wideband technology; UWB bandpass filter; microstrip line; multiple-mode resonator; wide upper stopband;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference, 2007. APMC 2007. Asia-Pacific

Conference_Location

Bangkok

Print_ISBN

978-1-4244-0748-4

Electronic_ISBN

978-1-4244-0749-1

Type

conf

DOI

10.1109/APMC.2007.4555158

Filename

4555158