Dual‐band stacked base station antenna array with high isolation

Abstract

A high‐isolation dual‐band base station antenna array is proposed. At first, a 5‐element high‐band (HB) dipole antenna array with inter‐element distance of 0.4 λH0 (the free‐space wavelength at the center frequency of the HB) is decoupled. With the main antenna decoupling surface (ADS), metal baffles and auxiliary ADS, the E‐plane and H‐plane couplings can be reduced to <−23.1 dB (<−11.4 dB without decoupling) and <−22.6 dB (<−14.8 dB without decoupling), respectively. The dual‐layer ADS design successfully resolves the contradiction between decoupling performance and matching. The ground plane of the 5‐element array is then exploited as the low‐band patch radiator, forming the proposed dual‐band antenna array. Measured results show that satisfactory cross‐band isolation (>33.1 dB), in‐band isolation (>22.2 dB) and polarization isolation (>30 dB) are obtained. Stable unidirectional radiation patterns are also acquired.

Design of compact dual‐band shared‐aperture antenna system based on frequency selective surface

“…A triple‐band composite base station and satellite antenna array is proposed in Ma et al, 5 in which the mid‐band and low‐band units are nested, and a reflector is loaded for the mid‐band unit to achieve coplanar radiation in the mid‐band and low‐band. A dual‐band stacked base station antenna array is proposed in Li and Chu, 6 in which the lower‐band unit acts as a reflector for the upper‐band unit, and a double‐layer ADS structure is loaded, which finally achieves good performance in the operating band. In addition to the aforementioned literatures, there are other methods which can realize the shared‐aperture radiation of upper and lower‐band units, 7–13 but most of the antennas have an aperture of 0.35–0.6 $${\lambda }_{L}$$.…”

Wideband dual‐polarized wide solid angle scanning cylindrically conformal millimeter‐wave phased array

“…However, the bandwidth of above arrays is narrower than 10%. Most sub-6 GHz wideband dual-polarized base station antennas are inspired by cross dipoles fed by vertical balun, [9][10][11][12][13] which is difficult be applied to mmWave base stations. 14 Therefore, appropriate cylindrically-conformal phased array with wide band, dual-polarization, and wide-angle scanning characteristics is still needed to be researched for mmWave base stations.…”