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Dynamic manipulation of light at nanoscale is highly important for many applications, including optical security systems, optical tweezers and compact optoelectronic devices. A number of tuning methods using thermal, mechanical, optical, and electrical mechanisms have been reported. Among all, electrical tuning, based on incorporation of phase-change media, is the most prevailing thanks to on-chip...
A frequency reconfigurable quasi-Yagi dipole antenna is presented in this paper. Simulation results show that a 35% continuously tuning impedance bandwidth, from 1.85 to 2.5GHz, is obtained. Loaded with varactor diodes, the effective electrical lengths of the driver and director dipoles are varied by changing the biasing voltages. The length adjustable director allows the endfire pattern with relatively...
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