In this article, a miniaturized dual-band dual-polarized slot antenna array is proposed for base station applications. It consists of two closely located $1 \times 4$ subarrays for the digital cellular system (DCS) and wideband code division multiple access (WCDMA) operations. The band-notched slot antenna (BNSA) is designed and adopted as the subarray element with radiation-suppression characteristic at notch frequencies. The notch frequency for one subarray is designed at the center operating frequency of the other subarray. As a result, the radiation from DCS subarray could be effectively suppressed within the WCDMA band and vice versa, resulting in high isolation between two subarrays with a small separation distance. By using the artificial magnetic conductor (AMC) reflector, the array height could be reduced by half, as compared with the perfect electric conductor (PEC) counterpart. In addition, a four-way unequal power divider is designed for the array’s beam-pattern synthesis. For the demonstration, the proposed array is fabricated and measured. The measurement results show that the dual-band array achieves the impedance bandwidths of 1.65–1.88 and 1.89–2.22 GHz, the isolations over 25 dB, the realized boresight gains of 12.2–12.8 and 12.3–13.2 dBi, and the sidelobe levels below −18 dB. The results indicate that the proposed array is a promising candidate for base-station applications.

中文翻译：

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用于基站应用的具有高隔离度的小型化双频双极化带槽隙缝天线阵列

在本文中，提出了一种用于基站应用的小型化双频双极化缝隙天线阵列。它由两个紧密定位的 $1 \times 4$ 子阵列组成，用于数字蜂窝系统 (DCS) 和宽带码分多址 (WCDMA) 操作。设计并采用带陷隙缝隙天线（BNSA）作为在陷波频率下具有辐射抑制特性的子阵元。一个子阵列的陷波频率设计为另一个子阵列的中心工作频率。因此，DCS子阵的辐射可以在WCDMA频段内得到有效抑制，反之亦然，从而使两个子阵之间的隔离距离很小。通过使用人造磁导体（AMC）反射器，阵列高度可以减少一半，与完美电导体 (PEC) 对应物相比。此外，还为阵列的波束图合成设计了一个四路不等功率分配器。为了演示，建议的阵列被制造和测量。测量结果表明，双频阵列实现了1.65-1.88和1.89-2.22 GHz的阻抗带宽，超过25 dB的隔离度，实现了12.2-12.8和12.3-13.2 dBi的视轴增益，旁瓣电平低于- 18 分贝。结果表明，所提出的阵列是基站应用的有希望的候选者。测量结果表明，双频阵列实现了1.65-1.88和1.89-2.22 GHz的阻抗带宽，超过25 dB的隔离度，实现了12.2-12.8和12.3-13.2 dBi的视轴增益，旁瓣电平低于- 18 分贝。结果表明，所提出的阵列是基站应用的有希望的候选者。测量结果表明，双频阵列实现了1.65-1.88和1.89-2.22 GHz的阻抗带宽，超过25 dB的隔离度，实现了12.2-12.8和12.3-13.2 dBi的视轴增益，旁瓣电平低于- 18 分贝。结果表明，所提出的阵列是基站应用的有希望的候选者。