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Proof of Concept of a Dual-Band Circularly-Polarized RF MEMS Beam-Switching Reflectarray

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3 Author(s)
Guclu, C. ; Department of Electrical Engineering and Computer Science, University of California Irvine, Irvine, CA, USA ; Perruisseau-Carrier, J. ; Civi, O.

In this communication we propose the concept of a circularly polarized reflectarray (RA) antenna capable of independent beam-switching in both K and Ka bands. The RA unit cell comprises one microstrip ring per each operation frequency. Each ring is integrated with six equally spaced series RF micro electro-mechanical systems (RF MEMS) switches, which allows implementing the sequential rotation principle formerly used in circularly-polarized RA for single-frequency operation. A detailed design is proposed, considering the best relative arrangement of the rings corresponding to each frequency, the accurate modeling of the RF MEMS switches, and the full-wave simulation of the full array. The designed RA is implemented on a 4-inch quartz wafer and comprises 109 K-band and 124 Ka-band split-rings. Two prototypes representing two frozen states of the reconfigurable antenna are fabricated and measured. The designed RA can provide {\pm}{120}^{\circ} progressive phase difference in both operation bands exhibiting beam switching to {\pm}{35}^{\circ} and {\pm}{24}^{\circ} off the broad-side in K and Ka bands respectively. The performance of the designed antenna is verified by the agreement of the measured and simulated radiation patterns.

Published in:

Antennas and Propagation, IEEE Transactions on  (Volume:60 ,  Issue: 11 )