Substrate Integrated Waveguide Diplexer Based on Circular Triplet Combline Filters

Author

Sirci, Stefano ; Martinez, Jorge D. ; Vague, Joaquin ; Boria, Vicente E.

Author_Institution

iTEAM, Univ. Politec. de Valencia, València, Spain

Volume

25

Issue

7

fYear

2015

fDate

Jul-15

Firstpage

430

Lastpage

432

Abstract

The design of substrate integrated waveguide (SIW) diplexers, based on combline triplet sections with transmission zeros (TZs) placed below and above the passband, is presented. In order to control the location of the TZs, positive and negative couplings are conveniently provided. A highly compact implementation based on circular substrate integrated coaxial resonators is proposed. An X-band diplexer with channel center frequencies at 9.5 and 10.5 GHz and absolute bandwidths of 400 MHz is designed. The structure shows important advantages in terms of size reduction, while keeping good insertion losses as well as high rejection and isolation levels.

Keywords

UHF circuits; UHF couplers; UHF filters; coaxial waveguides; microwave circuits; microwave filters; multiplexing equipment; resonator filters; substrate integrated waveguides; waveguide couplers; SIW; TZ; bandwidth 400 MHz; circular substrate integrated coaxial resonator; circular triplet combline filter; frequency 10.5 GHz; frequency 9.5 GHz; negative coupling; positive coupling; substrate integrated waveguide diplexer; transmission zero; Couplings; Insertion loss; Iris; Microwave filters; Probes; Substrates; Wireless communication; Combline filters; diplexer; substrate integrated waveguide (SIW); transmission zeros (TZs);

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2015.2427516

Filename

7110406