Title :
A novel type of constant impedance travelling wave phase shifter for InP-based MMICs
Author :
Kremer, R. ; Redlich, S. ; Brings, L. ; Jager, D.
Author_Institution :
FG Optoelektronik, Gerhard-Mercator-Univ., Duisburg, Germany
Abstract :
The paper presents a novel type of externally controllable phase shifter based on periodic coplanar transmission lines consisting of Schottky contact (SCCPL) and coplanar sections on passive substrate. The modeling of the devices is carried out by utilizing a four-pole representation of the underlying /spl pi/-sections. An optimized InP-InGaAs-InAlAs layer structure for the SCCPL is developed providing an external electronic control. Measured phase shifts up to 60/spl deg//mm at 20 GHz with a line impedance of 48/spl plusmn/1.2 /spl Omega/ agree well with theoretical calculations.
Keywords :
MMIC phase shifters; Schottky barriers; electric impedance; equivalent circuits; indium compounds; integrated circuit modelling; transmission line theory; /spl pi/-sections; 20 GHz; InP; InP-InGaAs-InAlAs; InP-based MMICs; SHF; Schottky contact; constant impedance phase shifter; coplanar sections; external electronic control; externally controllable phase shifter; four-pole representation; optimized InP/InGaAs/InAlAs layer structure; passive substrate; periodic coplanar transmission lines; travelling wave phase shifter; Capacitance; Coplanar transmission lines; Distributed parameter circuits; Impedance; Indium gallium arsenide; MMICs; Microwave devices; Phase shifters; Schottky barriers; Substrates;
Conference_Titel :
Microwave Symposium Digest, 1996., IEEE MTT-S International
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-3246-6
DOI :
10.1109/MWSYM.1996.508508
