Sharp-Rejection Wide-Band Dual-Band Bandpass Planar Filters With Broadly-Separated Passbands

Author

Sanchez-Soriano, Miguel A. ; Gomez-Garcia, Roberto

Author_Institution

LabSTICC, Univ. de Bretagne Occidentale, Brest, France

Volume

25

Issue

2

fYear

2015

fDate

Feb. 2015

Firstpage

97

Lastpage

99

Abstract

This letter focuses on the application of signal-interference principles to design planar dual-band bandpass filters (BPFs) with widely-spaced broad passbands. To this aim, two classes of dual-band bandpass transversal filtering sections (TFSs) shaped by directional couplers with double loading stubs are used. Analytical equations for their transmission zeros (TZs), leading to sharp-rejection and high-selectivity performances in their filtering behavior, are given. Besides, design curves to adjust the center frequencies and bandwidths of their dual passbands are provided. Furthermore, two demonstrative microstrip dual-band BPF prototypes are manufactured and characterized.

Keywords

band-pass filters; directional couplers; microstrip filters; transversal filters; TFS; design curves; directional couplers; double loading stubs; dual-band bandpass transversal filtering sections; filtering behavior; microstrip dual-band BPF prototypes; planar dual-band bandpass filters; signal-interference principles; transmission zeros; widely-spaced broad passbands; Band-pass filters; Bandwidth; Dual band; Microstrip; Passband; Prototypes; Bandpass filters (BPFs); directional couplers; dual-band filters; microstrip filters; planar filters; transmission zero (TZ); transversal filters; wide-band bandstop filters;

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2014.2382669

Filename

6996012