Title :
Second-order approximation for the design of broadband couplers using nonuniform lines
Author :
Garault, Y. ; Villotte, J.P.
Author_Institution :
Université de Limoges, Laboratoire d´´Electronique et Microondes, Limoges, France
Abstract :
The purpose of the letter is to present an analytical response of asymmetric nonuniform coupled-transmission-line directional couplers in a 2nd-order approximation. It is based on the equivalence between directional couplers and even-mode nonuniform transmission lines.
Keywords :
directional couplers; high-frequency transmission lines; broadband directional coupler design; nonuniform HF transmission lines;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19740408
