Title :
Conductor-backed coplanar waveguide directional coupler and its use for a varactor-tuned 90° phase shifter
Author :
Akkaraekthalin, P. ; Sawangnate, C. ; Vivek, V.
Author_Institution :
Fac. of Eng., King Mongkut´´s Inst. of Technol., Bangkok, Thailand
Abstract :
This paper presents a new 3-dB coplanar waveguide coupled-line directional coupler with a conductor-backed ground plane and its application in tunable analog phase shifting. In this research, the 3-dB coupled-line directional coupler and phase shifter were optimally designed and built on a microwave substrate. The proposed directional coupler showed promising results and the phase shifter circuit exhibited capabilities of fine phase tuning from 88° to 93° with reverse biases from 0 to 10 V at the operating frequency of ~8 GHz, low insertion loss of ⩽5 dB, and large bandwith of ~2 GHz
Keywords :
coplanar waveguide components; directional couplers; microwave phase shifters; tuning; varactors; 0 to 10 V; 2 GHz; 3 dB directional coupler; 5 dB; 8 GHz; SHF; conductor-backed CPW directional coupler; conductor-backed ground plane; coplanar waveguide directional coupler; coupled-line directional coupler; fine phase tuning; microwave substrate; ninety degree phase shifter; tunable analog phase shifting; varactor-tuned phase shifter; Circuit optimization; Coplanar waveguides; Coupling circuits; Directional couplers; Frequency; Insertion loss; Microwave circuits; Phase shifters; Planar waveguides; Tunable circuits and devices;
Conference_Titel :
Circuits and Systems, 2000. IEEE APCCAS 2000. The 2000 IEEE Asia-Pacific Conference on
Conference_Location :
Tianjin
Print_ISBN :
0-7803-6253-5
DOI :
10.1109/APCCAS.2000.913552
