Lk. Yu et B. Rawat, DESIGN OF A MICROSTRIP 6-PORT DIRECTIONAL COUPLER ON AN ANISOTROPIC SUBSTRATE, International journal of electronics, 82(4), 1997, pp. 381-391
The design procedure for a microstrip six-port directional coupler on
Epsilam-10 anisotropic substrate is described. An experimental 10 dB s
ix-port directional coupler with centre frequency 1.1 GHz and bandwidt
h of 1.4 GHz has been designed, fabricated and tested. The measured sc
attering parameters have been found to be in good agreement with the t
heoretical predictions.