Title :
Analysis and design of a high-performance planar Marchand balun
Author :
Ng, C.Y. ; Chongcheawchamnan, M. ; Robertson, I.D.
Author_Institution :
Sch. of Electron., Comput. & Math., Surrey Univ., Guildford, UK
Abstract :
This paper presents an enhanced Marchand balun that offers excellent amplitude and phase balance performance. The enhanced Marchand balun is designed using compensated coupled lines. It employs capacitive compensation, a renowned technique for compensating the unequal even- and odd-mode phase velocities encountered in parallel-coupled microstrips. Analysis carried out in this study has proven that the finite directivity of coupled lines significantly affects the balun performance. The proposed capacitively-compensated Marchand balun is demonstrated at 2.1 GHz and has offered excellent results.
Keywords :
baluns; capacitance; compensation; coupled transmission lines; microstrip lines; 2.1 GHz; amplitude balance performance; balun performance; capacitive compensation; capacitively-compensated Marchand balun; compensated coupled lines; coupled lines; enhanced Marchand balun; finite directivity; parallel-coupled microstrips; phase balance performance; planar Marchand balun analysis; planar Marchand balun design; unequal even/odd-mode phase velocities; Capacitors; Coupling circuits; Dielectrics; Directional couplers; Electronic mail; Impedance matching; Mathematics; Microstrip; Performance analysis; Transformers;
Conference_Titel :
Microwave Symposium Digest, 2002 IEEE MTT-S International
Conference_Location :
Seattle, WA, USA
Print_ISBN :
0-7803-7239-5
DOI :
10.1109/MWSYM.2002.1011572
