Grating Lobes Reduction Using a Multilayer Frequency Selective Surface on a Dual-Polarized Aperture Array Antenna in Ka-Band

Abstract

This paper presents a multilayer frequency selective surface for a dual-polarized aperture array antenna in Ka-band. The 8×8 elements of the array are cylindrical open cavities with a diameter of 0.6λ 0 at 30 GHz, and spaced one wavelength. Due to this separation between elements, which is limiting and not reducible by the architecture of the feeding network and the size of the radiating element, grating lobes appear. Frequency Selective Surfaces (FSS) can be a solution to this problem without modifying the feeder architecture nor the radiating elements. This paper presents the FSS design for reducing grating lobes level, the antenna assembly, and the experimental validation. The full antenna performance demonstrates that FSS operates in a range identical to the feeder (29.5 GHz to 31 GHz) with the added benefit of reducing the grating lobes level more than 10 dB for both polarizations.

Design and Characterization of the Fully Metallic Gap Waveguide-Based Frequency Selective Radome for Millimeter Wave Fixed Beam Array Antenna

“…Therefore, the near-field coupling effect between the array antenna and the FSS radome must be considered. One common approach is to further optimise the unit cell FSS in conjunction with the array antenna [23]. In this case, adjusting both the antenna and the FSS dimensions is particularly required.…”

“…Furthermore, as mentioned above, the proposed GW-FSS was not purposely developed for this particular array antenna. Thus, throughout the design phase, joint matching optimisation of the FSS with the antenna design as reported, e.g., in [23], was not performed during our design stage. Therefore, some impedance matching degradation in the passband was observed.…”

Design of frequency selective surface using proximity mode coupling and its applications to Ku band RCS reduction

“…To explore the advantages of the proposed FSS over the previously designed FSS, a comparative study is carried out. FSS structures presented in References 13–17 are considered for the comparison with the proposed work in terms of RCS, BW, no of layers, substrate material, and size of unit cell. Table 2 summarizes the characteristics of FSS and its RCSR.…”

Array Antennas and Radomes for Millimetre-Wave 5G Applications

“…Therefore, the near-field coupling effect between the array antenna and the FSS radome must be considered. One common approach is to further optimise the unit cell FSS in conjunction with the array antenna [133]. In this case, adjusting both the antenna and the FSS dimensions is particularly required.…”

“…Furthermore, as mentioned above, the proposed GW-FSS was not purposely developed for this array antenna. Thus, throughout the design phase, joint matching optimisation of the FSS with the antenna design as reported, e.g., in [133], was not performed during our design stage. Therefore, some impedance matching degradation in the passband was observed.…”