Title :
Improved Capacitive Loading Method for Miniaturization of 0 dB Forward-Wave Directional Couplers
Author :
Park, Ji-Hoon ; Lee, Yongshik
Author_Institution :
Dept. of Electr. & Electron. Eng., Yonsei Univ., Seoul, South Korea
fDate :
4/1/2011 12:00:00 AM
Abstract :
An improved capacitive loading method for miniaturization of 0 dB forward-wave directional couplers is demonstrated. The method enables to miniaturize the coupler to have a predetermined characteristic impedance, eliminating the need for additional impedance transformers and therefore allowing for a substantial improvement in the degree of miniaturization. Experimental results for a 0 dB coupler at 5.0 GHz are provided. The demonstrated miniaturization rate of 89.4% is higher than previous methods, along with the widest fractional bandwidth and the minimum insertion loss.
Keywords :
coupled circuits; impedance convertors; capacitive loading method; characteristic impedance; forward-wave directional coupler; frequency 5 GHz; impedance transformer; miniaturization rate; minimum insertion loss; Capacitance; Capacitors; Couplings; Directional couplers; Impedance; Loading; 0 dB coupler; Forward coupler; microstrip directional coupler; miniaturization;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2011.2109056
