Frequency Selective Surface-Based Dual-Band Dual-Polarized High-Gain Antenna

This article presents a frequency selective surface (FSS)-based dual-band dual-polarized antenna with compact size and high gain. The proposed dual-band antenna consists of a low-band (LB) and high-band (HB) antenna elements. The HB element is coaxially located under the radiator of the LB element, minimizing the overall size. The proposed LB element consists of a two-layer-FSS-based radiator (FSS-radiator) and two pairs of differential feeding probes. Besides, the passband of the proposed FSS-radiator is designed to cover the operating band of the HB element. As a result, the radiation of the HB element can transmit through the FSS-radiator of the LB element. Without reducing HB element gain, instead, the average HB element gain can be improved more than 1 dB by the feeding probes of the LB element. For demonstration, a prototype of the dual-band antenna operating in the LB of 2.3-2.7 GHz and the HB of 3.3-3.8 GHz is fabricated and measured. The dual-band prototype features high gain (similar to 9.1 dBi in the LB and similar to 8.6 dBi in the HB) in a compact radiation aperture of 0.32 lambda(lc) x 0.32 lambda(lc) or 0.45 lambda(hc) x 0.45 lambda(hc) (where lambda(lc) and lambda(hc), respectively, denote the guided wavelengths at the central operating frequencies in LB and HB). Moreover, easy fabrication and low cost are achieved. These merits make the proposed antenna suitable for multiband aperture-shared array.

Automated summary

This article presents a dual-band dual-polarized antenna with frequency selective surface (FSS) that is compact in size and has high gain. The proposed antenna design allows radiation from the high-band element to transmit through the FSS-radiator of the low-band element, resulting in improved gain without reducing the gain of the high-band element. A prototype of the antenna operating in the 2.3-2.7 GHz and 3.3-3.8 GHz frequency bands was fabricated and measured, demonstrating high gain in a compact radiation aperture. The proposed antenna is suitable for multiband aperture-shared arrays due to its easy fabrication and low cost.