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Amplitude and Phase Controlled Reflectarray Element Based on an Impedance Transformation Unit

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2 Author(s)
Pochiraju, T. ; High Freq. Eng. Group, Queens Univ. of Belfast, Belfast, UK ; Fusco, V.

An architecture to simultaneously affect both amplitude and phase control from a reflectarray element using an impedance transformation unit is demonstrated. It is shown that a wide range of control is possible from a single element, removing the conventional necessity for variable sized elements across an array in order to form a desired reflectarray far-field pattern. Parallel plate waveguide measurements for a 2.2 GHz prototype element validate the phase and amplitude variation available from the element. It is demonstrated that there is sufficient control of the element's reflection response to allow Dolph-Tschebyscheff weighting coefficients for major-lobe to side-lobe ratios of up to 36 dB to be implemented.

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Antennas and Propagation, IEEE Transactions on  (Volume:57 ,  Issue: 12 )