Title :
Waveguide branch couplers for tight couplings
Author :
Shen, T. ; Zaki, K.A. ; Dolan, T.
Author_Institution :
Dept. of Electr. & Comput. Eng., Maryland Univ., College Park, MD, USA
Abstract :
Waveguide T-junction equivalent circuits are extracted from full-wave modeling results. They are used to explain why tight couplings are difficult to realise using waveguide branch couplers, from the viewpoint of coupler synthesis. Full-wave optimization design is used to obtain tight couplings. A 3-dB waveguide branch coupler is designed. Its coupling variation is within /spl plusmn/0.1 dB, and its return loss and isolation are greater than 40 dB, over the 23% guide-wavelength bandwidth. Measured results are in good agreement with computed results.
Keywords :
Equivalent circuits; Optimization; Waveguide couplers; Waveguide junctions; Waveguide theory; coupler synthesis; full-wave modeling; full-wave optimization design; isolation; return loss; tight couplings; waveguide T-junction equivalent circuits; waveguide branch couplers; Bifurcation; Circuit synthesis; Couplers; Coupling circuits; Design optimization; Equivalent circuits; Matrix decomposition; Scattering; Waveguide discontinuities; Waveguide junctions;
Conference_Titel :
Microwave Symposium Digest. 2000 IEEE MTT-S International
Conference_Location :
Boston, MA, USA
Print_ISBN :
0-7803-5687-X
DOI :
10.1109/MWSYM.2000.861763
