A Multiband Millimeter-Wave 2-D Array Based on Enhanced Franklin Antenna for 5G Wireless Systems

This letter presents a novel and compact antenna array suggesting geometrical modifications in the concept of collinear arrays at millimeter-wave (MMW) spectrum. The extension of the standard narrowband Franklin linear antenna array in a compact 2-D assembly is proposed and multiband response is accomplished in this work, which fulfills demands of future fifth-generation (5G) systems. The proposed 2-D antenna array is designed to operate at licensed frequency bands of 28 and 37-39 GHz recommended by the U.S. Federal Communications Commission for 5G wireless networks, as well as at 33 GHz for satellite communication and navigation applications. Measurements validate the triple-band response at the desired frequencies of operation. The proposed antenna array also offers distinguishing performance in terms of high gain and significant efficiency above 70% in all the MMW operating bands.