Title :
Compact tunable periodically LC loaded microstrip line for phase shifting applications
Author :
Damm, Christian ; Schussler, Martin ; Oertel, Marius ; Jakoby, Rolf
Author_Institution :
Inst. fur Hochfrequenztechnik Merckstrasse, Technische Univ. Darmstadt, Germany
Abstract :
The properties of periodically LC loaded lines with tuneable capacitors are investigated for phase shifting applications. Basic equations are derived describing the losses due to the tuning mismatch and the quality of the tuneable material. The performance of microstrip line phase shifting devices with right- and lefthanded wave propagation is compared and evaluated in terms of a defined figure of merit. As a demonstrator, a phase shifter circuit using the principle of periodically LC reactive loading is realized with varactor diodes. The comparison with other circuit topologies confirms the idea to realize compact devices with this circuit concept.
Keywords :
circuit tuning; metamaterials; microstrip circuits; microstrip lines; network topology; periodic structures; phase shifters; transmission line theory; varactors; circuit topologies; left handed structures; left handed wave propagation; microstrip line phase shifting devices; periodic LC loaded microstrip lines; periodic LC reactive loading; phase shifter circuits; right handed wave propagation; tuneable capacitors; tuning mismatch; varactor diodes; Capacitance; Circuit optimization; Equations; Frequency; Impedance; Microstrip; Phase shifters; Propagation constant; Tunable circuits and devices; Varactors;
Conference_Titel :
Microwave Symposium Digest, 2005 IEEE MTT-S International
Print_ISBN :
0-7803-8845-3
DOI :
10.1109/MWSYM.2005.1517137
