Abstract
This article presents a novel dual slant polarized antenna for millimeter-wave (mmWave) base stations. Compared with the traditional slant polarized mmWave antennas, the proposed antenna offers the advantages of high cross-polarization discrimination (XPD), good aperture efficiency, simple structure, and low profile. The corner-fed substrate integrated waveguide (SIW) cavity is adopted to improve the port isolation and XPD of this slot-coupled antenna. Four corner-truncated patches connected by a thin cross strip are placed over the SIW cavity to increase the operation bandwidth. Then, a 2 × 8 antenna array is designed to exemplify the antenna element performance. To improve the impedance matching, a shorted patch is introduced in designing the series feeding network and the power divider. The experimental results show that the 2 dB-down gain bandwidth of the proposed antenna array reaches 6.0% and the port isolation is better than 20 dB. The gain and XPD of the antenna array measure 16.7 dBi and 25 dB at the center frequency, respectively.
Highlights
INTRODUCTIONB OTH the theoretical and experimental results prove that polarization diversity can combat multipath fading, increase channel capacity, and improve system
B OTH the theoretical and experimental results prove that polarization diversity can combat multipath fading, increase channel capacity, and improve systemManuscript received December 5, 2019; revised June 22, 2020; accepted August 1, 2020
Different from the patch antenna reported in [28] where four separate patches are placed over a slot aperture, the patches in our design are truncated at the corners and a cross strip is added at the center of antenna to connect these patches
Summary
B OTH the theoretical and experimental results prove that polarization diversity can combat multipath fading, increase channel capacity, and improve system. YANG et al.: CAVITY-BACKED SLOT-COUPLED PATCH ANTENNA ARRAY WITH DUAL SLANT POLARIZATION. These antennas cannot be applied to mmWave base stations due to high profile and high complexity in designing the feeding structures at mmWave frequencies. All these antennas mentioned above cannot simultaneously meet the requirements of dual slant polarization, high aperture efficiency, small size, low complexity, and low profile. A low-profile, low-complexity, and high-XPD ±45◦ dual slant polarized cavity-backed slot-coupled patch antenna is developed.
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