Title :
Advanced characterization and design of compensated high directivity quadrature coupler
Author :
Müller, Johannes ; Jacob, Arne F.
Author_Institution :
Inst. fur Hochfrequenztech., Techn. Univ. Hamburg-Harburg, Hamburg, Germany
Abstract :
An efficient design procedure for directional couplers based on the effective even and odd mode characteristic impedances and electrical lengths is presented. These quantities which are extracted from the scattering parameters of the overall coupler structure allow for a systematic optimization. This is useful, for instance, when designing compensated high directivity couplers or when large bandwidth performance is desired. The method is applied to optimize a 2 GHz wiggly line coupler. Measurements yield a directivity of better than 30 dB from DC to 3.5 GHz, confirming the simulation results.
Keywords :
S-parameters; directional couplers; compensated high directivity quadrature coupler; design procedure; directional couplers; frequency 2 GHz; frequency 3.5 GHz; odd mode characteristic; scattering parameters; Bandwidth; Coupling circuits; Dielectric substrates; Directional couplers; Frequency; Impedance; Jacobian matrices; Matched filters; Network synthesis; Scattering parameters;
Conference_Titel :
Microwave Symposium Digest (MTT), 2010 IEEE MTT-S International
Conference_Location :
Anaheim, CA
Print_ISBN :
978-1-4244-6056-4
Electronic_ISBN :
0149-645X
DOI :
10.1109/MWSYM.2010.5517872
