Journal
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
Volume 9, Issue -, Pages 1241-1244Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LAWP.2011.2104934
Keywords
Antenna arrays; microstrip arrays; reconfigurable antennas; reflectarrays; reflector antennas; varactors
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This letter presents a varactor diode-tuned reflectarray element that achieves an improved element phase bandwidth relative to designs that employ a single resonance for phase tuning. This is accomplished by introducing two resonances in the element while maintaining a single-layer structure. Simulation results based on full-wave simulations compare favorably to experimental measurements inside a waveguide. The unit cell exhibits over 380 of phase agility, 3.5 dB of peak cell loss, and a 2.4% phase bandwidth at 5.4 GHz. In addition, it has the attractive features of using only a single control voltage as well as having a quasi-linear phase versus voltage characteristic.
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