Design of a Wideband Single-Layer Reflectarray Antenna Using Slotted Rectangular Patch With Concave Arms

Design of a Wideband Single-Layer Reflectarray Antenna Using Slotted Rectangular Patch With Concave Arms

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A Treatments - Cold novel single-layer slotted rectangular patch with concave arms is proposed for wideband reflectarrays.The broadband characteristic is realized by combining both bandwidth enhancement techniques, i.e.using multi-resonant element and slotted rectangular patch element.

By placing a pair of concave arms beside the slotted rectangular patch, additional resonance is introduced for an improved phase range and linearity.The element is optimized for a rather linear phase range covering 360°, resulting in a broadband behavior.Key geometrical parameters are studied to apprehend its working principle.Employing the novel unit cell, a reflectarray with 25° offset-fed, and constituting 23×23 elements with 0.

3λ element periodicity at 10 GHz, is simulated Ring and measured.Good agreement is obtained between the simulation and the measurement.The proposed reflectarray features a wide measured 32% 1-dB gain bandwidth and a maximum aperture efficiency of 65%.Furthermore, the measured side-lobe and cross-polarization levels are 20 dB and 32 dB at 10 GHz, respectively.