Title :
A tunable artificial magnetic conductor using switched capacitance in a concentric overlapping geometry
Author :
Sanchez, V. ; Paller, E.
Author_Institution :
Titan Aerosp. Electron. Div., Greenbelt, MD, USA
Abstract :
In this paper, a new method for reconfiguration of artificial magnetic conductors has been described that uses a switched capacitive overlap in a concentric loop geometry. A simple circuit model has been developed for rapid iteration that agrees well with the rigorous full-wave solution for reflection phase. The concept has been successfully demonstrated in a geometry that exhibits more than 3:1 tuning bandwidth. A practical limit of 5:1 or 6:1 bandwidth is possible (depending on operating band and practical limitations of the PIN diodes or MEMs switches). The frequency bands for the high-impedance and surface wave bandgap have been demonstrated to maintain alignment as the structure is reconfigured.
Keywords :
frequency selective surfaces; microswitches; p-i-n diodes; switched capacitor networks; tuning; AMC reconfiguration; EM reflection; FSS; MEMS switches; PIN diodes; concentric loop geometry; concentric overlapping geometry; high-impedance surface; surface wave bandgap; switched capacitance; switched capacitive overlap; tunable artificial magnetic conductor; tuning bandwidth; Bandwidth; Capacitance; Circuit optimization; Conductors; Geometry; Magnetic switching; Microswitches; Reflection; Tunable circuits and devices; Tuning;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2003. IEEE
Print_ISBN :
0-7803-7846-6
DOI :
10.1109/APS.2003.1219270
