Title :
DC isolated directional coupler
Author :
Turalchuk, Pavel ; Munina, Irina ; Vendik, Irina ; Jia Ni ; Jiasheng Hong
Author_Institution :
Dept. of Microelectron. & Radio Eng., St. Petersburg Electrotech. Univ., St. Petersburg, Russia
Abstract :
Novel designs of directional couplers with input and output isolation for microwave circuits are proposed. The low-loss directional coupler on coupled lines designed with implementation of multilayer liquid crystal polymer (LCP) technology is considered as a component of phase shifters. Using thin layers of LCP circuit material makes it possible to realize a periodical capacitive loading of coupled lines in order to obtain dc isolation between input and outputs, which allows significant simplifying the biasing circuitry of phase shifters and as a result reducing overall size. In line with the experimental results of the coupled line structure the insertion loss does not exceed 0.1 dB in operational frequency band 2.7-3.2 GHz.
Keywords :
coupled transmission lines; directional couplers; liquid crystal polymers; microwave isolators; microwave phase shifters; LCP circuit material; biasing circuitry; coupled lines; dc isolation; frequency 2.7 GHz to 3.2 GHz; input isolation; low-loss directional coupler; microwave circuits; multilayer LCP technology; multilayer liquid crystal polymer technology; output isolation; periodical capacitive loading; phase shifters; Capacitors; Directional couplers; Insertion loss; Microwave amplifiers; Nonhomogeneous media; Phase shifters; coupled lines; directional coupler; liquid crystal polymer (LCP); multilayer technology;
Conference_Titel :
Microwave Conference (EuMC), 2014 44th European
Conference_Location :
Rome
DOI :
10.1109/EuMC.2014.6986377
