Title :
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
fDate :
6/1/2001 12:00:00 AM
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;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
