A dual polarization, broadband, millimeter-wave reflectarray using modified cross loop element

摘要: A Ka-band reflectarray consisting of modified cross loop is investigated in this article for millimeter-wave broadband dual-polarization applications. It consists 40 × unit cells that covered an area 200 mm2 and a multimode conical horn antenna which connected to orthomode transducer as the offset feed. Its cell composed solid inside outside, can lead nearly 550° linear phase shift curve by varying its length. After proposed structure has been analyzed compared with traditional wideband element (i.e., double loop), it used reflectarray. An equivalent circuit model insightful field distribution analyze their different behaviors when resonated at same operating frequency. For vertical horizontal polarization modes, peak gain are measured be 34.3 33.5 dB, aperture efficiency 48.6% 40.4% center frequency 32 GHz, respectively. The 1.5 dB bandwidth close 18% 15%, better than conventional single-layer ones. This new especially useful © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:287–293,