Title :
Design High-Directivity Parallel-Coupled Lines with Step-Impedance Transmission Lines
Author :
Kumpang, S. ; Phromloungsri, R. ; Chongcheawchamnan, M.
Author_Institution :
Res. Center of Electromagn.-Wave Applic., Mahanakorn Univ. of Technol., Bangkok
Abstract :
This paper presents a novel technique to design high-directivity parallel-coupled lines using the step impedance transmission lines (SITLs) terminated at coupled and through ports of the parallel coupler. Two configurations based on the technique, singly- and doubly-SITLs compensation, are proposed. The practicable feasibility of the technique is demonstrated at 0.9 GHz on RF60 substrate, where the directivities obtained from measured results are improved more than 6 dB and 30 dB as compared with uncompensated coupler.
Keywords :
UHF couplers; microstrip lines; transmission lines; RF60 substrate; frequency 0.9 GHz; high-directivity parallel-coupled lines; parallel coupler; step-impedance transmission lines; Coupling circuits; Dielectric substrates; Equations; Impedance; Joining processes; Microstrip filters; Microstrip resonators; Microwave technology; Transmission line measurements; Transmission lines; Microstrip parallel-coupled lines; directivity enhancement; step-impedance 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.2007.4554999
