Abstract
In this article, a novel millimeter-wave dual-polarized 2-D multibeam antenna array incorporating differentially fed antenna elements is proposed to achieve high cross-polarization discrimination (XPD) when the beams scan to the maximal pointing angles. The antenna element is composed of an SIW cavity with four shorted patches placed inside, and it is differentially excited for dual-polarization by a pair of feeding strips and transverse slots beneath the patches. Differential excitation is realized by a power divider designed on two laminate layers. Two Butler matrices placed perpendicularly with each other in different laminates are employed to generate four tilted beams with dual-polarization. A $2\times 2$ dual-polarized 2-D multibeam antenna array working at 28 GHz is designed, fabricated, and measured. The operation bandwidth of the antenna is 26.8–29.2 GHz. The improvement in the XPD is experimentally demonstrated by far-field measurement. When the beams scan to 30° off the boresight, the measured XPDs are 28 dB at the center frequency and higher than 25 dB over the operation bandwidth, which confirms that the cross-polarized radiation in the 2-D multibeam antenna array is suppressed by using the differential-feeding technique. The measured gain is in the range from 7.6 to 10.5 dBi.
Highlights
W IRELSS communications have experienced considerable growth in the past decade due to ever-increasing handheld devices accessing to real time data
We introduce a novel dual-polarized 2D multibeam antenna array incorporating differential-fed antenna elements
This paper presents a novel design of mmWave dualpolarized 2D multibeam array antenna
Summary
W IRELSS communications have experienced considerable growth in the past decade due to ever-increasing handheld devices accessing to real time data. X. Yang is with the School of Communication and Information Engineering, Shanghai University, Shanghai 200444, China. The antenna element in [20] is realized by placing a parasitic patch over a square SIW cavity to achieve wide bandwidth Another antenna type widely used in mmWave multibeam antenna arrays is magneto-electric (ME) dipoles due to their wide bandwidth, broad beamwidth and symmetric radiation patterns [21] – [24]. As seen from these designs, most of the antennas are only able to steer beams in one dimension and operate with a single polarization.
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