Ultra-broad-band doubly balanced star mixers using planar Mouw´s hybrid junction

Author

Chang, Chi-Yang ; Tang, Ching-Wen ; Niu, Dow-Chih

Author_Institution

Dept. of Commun. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan

Volume

49

Issue

6

fYear

2001

fDate

6/1/2001 12:00:00 AM

Firstpage

1077

Lastpage

1085

Abstract

The planar Mouw´s hybrid junction is realized by coplanar waveguide (CPW) to coplanar strip (CPS) or CPW to CPW T-junctions. A new explanation of Mouw´s theory based on coupled transmission lines and including the transmission line losses is presented, The modified theory is more suitable for ultra-broad-band mixer design. Some prototype mixers with CPW to CPS or CPW to CPW T-junctions are fabricated with Al ₂O₃ substrate, The prototype mixers show a bandwidth of greater than 20:1 if the even-mode resonance has been damped out. A method for damping out the even-mode resonance is also presented. All of the prototype circuits show much broader bandwidth than that of conventional star mixer

Keywords

coplanar waveguide components; coupled transmission lines; microwave mixers; waveguide junctions; CPW to CPW T-junctions; bandwidth; coplanar waveguide to coplanar strip; coupled transmission lines; doubly balanced star mixers; even-mode resonance; planar Mouw´s hybrid junction; transmission line losses; ultra-broad-band devices; Bandwidth; Coplanar transmission lines; Coplanar waveguides; Hybrid junctions; Planar transmission lines; Planar waveguides; Prototypes; Resonance; Transmission line theory; Waveguide junctions;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.925494

Filename

925494