Wideband Millimeter-Wave Microstrip Reflectarray Using Dual-Resonance Unit Cells

A wideband millimeter-wave reflectarray antenna is investigated. First, using the microstrip technique, a new dual-resonance unit cell is proposed for the reflectarray, which provides an approximately linear phase response of <inline-formula><tex-math notation="LaTeX">$0^{\circ }\text{--}360^{\circ }$</tex-math></inline-formula> range. Additionally, its phase response curves are nearly parallel within a broad band, which can widen the operating bandwidth of the reflectarray antenna. Then, using the proposed unit cells, a 1296-element reflectarray antenna is designed, fabricated, and measured. Finally, measured results show that the boresight gain is 31.9 dBi and the 1-dB bandwidth is greater than 29.3<inline-formula><tex-math notation="LaTeX">$\%$</tex-math></inline-formula> at Q-band. Simulation and measurement results agree very well with the proposed design scheme.

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