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A Wideband Transmitarray Using Dual-Resonant Double Square Rings

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6 Author(s)
Ryan, Colan G.M. ; R. Mil. Coll. of Canada, Kingston, ON, Canada ; Chaharmir, M.R. ; Shaker, J. ; Bray, J.R.
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A four-layer transmitarray operating at 30 GHz is designed using a dual-resonant double square ring as the unit cell element. The two resonances of the double ring are used to increase the per-layer phase variation while maintaining a wide transmission magnitude bandwidth of the unit cell. The design procedure for both the single-layer unit cell and the cascaded connection of four layers is described and it leads to a 50% increase in the -1 dB gain bandwidth over that of previous transmitarrays. Results of a 7.5% -1 dB gain bandwidth and 47% radiation efficiency are reported.

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Antennas and Propagation, IEEE Transactions on  (Volume:58 ,  Issue: 5 )