Title :
New high-directivity coupler design with coupled spurlines
Author :
Chang, Sheng-Fuh ; Chen, Jia-Liang ; Jeng, Yng-Huey ; Wu, Chain-Tin
Author_Institution :
Dept. of Electr. Eng., Nat. Chung Cheng Univ., Taiwan, Taiwan
Abstract :
A new high-directivity coupler using coupled spurlines is proposed. The effective capacitances of coupled spurlines generate an isolation zero at any desired frequency due to their equalization effect on the odd-mode and even-mode phase velocities. The measurement results demonstrate an improved performance over the conventional parallel-line coupler in terms of the isolation and the coupling flatness.
Keywords :
microstrip directional couplers; capacitance; coupled spurlines; coupling flatness; even-mode phase velocity; high-directivity coupler; isolation zero; microstrip directional coupler; odd-mode phase velocity; parallel-line coupler; Capacitance; Capacitors; Coupling circuits; Dielectrics; Directional couplers; Frequency; Impedance; Integrated circuit measurements; Microstrip; Spurline;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2003.822565
