Title :
A new class of branch-line directional couplers
Author_Institution :
Westinghouse Electr. Corp., Baltimore, MD, USA
Abstract :
A novel class of branch-line coupler is presented in which the shunt transmission line branches of the conventional coupler are replaced by shorted coupled transmission line pairs. This class of couplers allows for the realization of a wider range of designs for both loose coupling and wideband tight coupling values than the conventional coupler. The performance of couplers from this class is comparable to the performance of conventional couplers with only a slight decrease in bandwidth for most designs. Experimental results for a 20-dB microstrip test coupler show measured performance that is very close to predicted performance.<>
Keywords :
directional couplers; microstrip components; bandwidth; branch-line directional couplers; loose coupling; microstrip test coupler; shorted coupled transmission line pairs; wideband tight coupling; Bandwidth; Coupling circuits; Directional couplers; Distributed parameter circuits; Frequency; Impedance; Microstrip; Phase shifters; Planar transmission lines; Wideband;
Conference_Titel :
Microwave Symposium Digest, 1993., IEEE MTT-S International
Conference_Location :
Atlanta, GA, USA
Print_ISBN :
0-7803-1209-0
DOI :
10.1109/MWSYM.1993.276869
