Title :
Microstrip realisation of loosely coupled conductors with enhanced directivity
Author_Institution :
Plessey Tellumat South Africa Ltd., Retreat, South Africa
fDate :
2/16/1995 12:00:00 AM
Abstract :
A planar coupler design to achieve enhanced directivity with coupling factors <-20 dB is presented. The structure is both simple to design and fabricate. Coupler directivity is improved by using microstrip gap capacitors to equalise the odd and even mode phase velocities in the coupled structure. A directivity in excess of 22 dB was achieved over a bandwidth of 18% at 7.7 GHz
Keywords :
capacitance; microstrip directional couplers; 7.7 GHz; coupler directivity; coupling factors; loosely coupled conductors; microstrip gap capacitors; phase velocities equalisation; planar coupler design;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19950191
