Title :
A New Branch-Line Hybrid Coupler with Arbitrary Power Division Ratio
Author :
Chilhyeun Gwon ; Kwansun Choi ; Inho Na ; Jongsik Lim ; Yongbeom Kim ; Dal Ahn ; Kwisoo Kim
Author_Institution :
Dept. of Electr. & Commun. Syst. Eng., Soonchunhyang Univ., Asan
Abstract :
This paper proposes a new branch-line hybrid coupler with controllable power ratio at the output ports. It is structured as two 90deg branch-line hybrid couplers connected by a variable impedance transmission line. The power division ratio is adjusted by controlling the impedance of the transmission line. Modeling the transmission line as series and parallel resonators shows that its impedance can be changed by changing the inductance and capacitance. In practice, using a varactor diode facilitates ease in dealing with the impedance of the transmission line and thus the power division ratio of the coupler.
Keywords :
resonators; transmission lines; varactors; waveguide couplers; arbitrary power division ratio; branch-line hybrid coupler; controllable power ratio; impedance transmission line; parallel resonators; series resonators; varactor diode; Capacitance; Communication systems; Coupling circuits; Distributed parameter circuits; Impedance; Power engineering and energy; Power transmission lines; Systems engineering and theory; Transmission line theory; Varactors; Branch-line hybrid coupler; arbitrary power division ratio; reflection type; transmission line;
Conference_Titel :
Microwave Conference, 2007. APMC 2007. Asia-Pacific
Conference_Location :
Bangkok
Print_ISBN :
978-1-4244-0748-4
Electronic_ISBN :
978-1-4244-0749-1
DOI :
10.1109/APMC.2007.4555116
