Title :
Microstrip couplers with improved directivity
Author :
Herzog, Hans-jürgen
Author_Institution :
Deutsche Bundespost, Forschungsinstitut, Darmstadt, West Germany
Abstract :
Backward wave microstrip couplers with weak coupling reach small values for the directivity. This is caused by the unequal phase constants of the even and odd modes of the line waves. A very simple compensation method is shown by loading the coupler with additional coupled lines.
Keywords :
strip line components; backward wave microstrip couplers; compensation method; directivity; unequal phase constants;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19780036
