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

Date

2012-11-01

Author

Guclu, Caner
Perruisseau-Carrier, Julien
Aydın Çivi, Hatice Özlem

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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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 +/- 120 degrees provide progressive phase difference in both operation bands exhibiting beam switching to +/- 35 degrees and +/- 24 degrees 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.

Subject Keywords

Circularly polarized, Dual band, Reconfigurable, Reflectarray, RF MEMS, Split-ring

URI

https://hdl.handle.net/11511/46002

Collections

Department of Electrical and Electronics Engineering, Article