Title :
Length reduction of a short-slot directional coupler in a single-layer dielectric substrate waveguide by removing dielectric near the side walls of the coupler
Author :
Yamamoto, Shin-Ichi ; Hirokawa, Jim ; Ando, Makoto
Author_Institution :
Dept. of Electr. & Electron. Eng., Tokyo Inst. of Technol., Meguro, Japan
Abstract :
A method for reducing the size of a short-slot directional coupler by changing the dielectric constant near the side walls in the coupled region is proposed. The coupled length can be reduced by 51 % for the hybrid and by 57 % for the cross coupler, respectively. The distance between the couplers is also shortened, and the total size of the Butler matrix is reduced by 48 %.
Keywords :
directional couplers; permittivity; slot antenna arrays; Butler matrix; dielectric constant; length reduction; short-slot directional coupler; side walls; single-layer dielectric substrate waveguide; Antenna arrays; Butler matrix; Dielectric constant; Dielectric substrates; Directional couplers; Equations; Frequency; Postal services; Reflection; Slot antennas;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2004. IEEE
Print_ISBN :
0-7803-8302-8
DOI :
10.1109/APS.2004.1331844
