Title :
Transmission-line directional couplers for impedance transforming
Author :
Ahn, Hee-Ran ; Kim, Bumman
Author_Institution :
Dept. of Electron. & Electr. Eng., Pohang Inst. of Sci. & Technol.
Abstract :
Normalized scattering parameters of a two-port circuit terminated in arbitrary impedances are derived and design equations of directional couplers for impedance transforming are derived. To verify the design equations, a microstrip directional coupler is designed at a center frequency of 2GHz, fabricated on a substrate (epsivr=3.5,H= 30mil, tandelta= 0.04) and measured. The measured performance shows good agreement with the simulated one
Keywords :
S-parameters; coupled transmission lines; microstrip directional couplers; 2 GHz; coupled transmission lines; impedance transforming; microstrip directional coupler; normalized scattering parameters; transmission line; two-port circuit; Coupling circuits; Directional couplers; Distributed parameter circuits; Equations; Equivalent circuits; Impedance; Power transmission lines; Scattering parameters; Transmission line theory; Transmission lines; Coupled transmission lines; directional couplers for impedance transforming; normalized scattering parameters with two arbitrary termination impedances;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2006.882404
