Design of a wideband polarisation conversion metasurface and its application for RCS reduction and gain enhancement of a circularly polarised antenna

Abstract

An improved loading method of checkerboard‐based linear polarisation conversion metasurface (PCM) is proposed for gain enhancement and wideband radar cross‐section (RCS) reduction of the circularly polarised patch antenna (CPA). The proposed metasurface consists of a checkerboard arrangement of PCM and its mirror unit cells, and an improved loading method is used to rearrange the PCM unit cells around the radiating patch. The PCM unit cell is composed of a metallic pattern on the top and bottom surface covered with metal. A wideband RCS reduction is realised by achieving 180° cross‐polarisation reflection phase difference between the two neighbouring PCM unit cells and gain enhancement is achieved by the coherent superposition of energy in the far‐field between the radiating patch and PCM cells. Simulated and measured results depict that the operating bandwidth of CPA and the proposed antenna is 12.6–13.76 GHz. The peak gain of the proposed antenna is 3.5 dB higher than the CPA and 3‐dB axial ratio bandwidth of the designed antenna is 200 MHz. The proposed antenna achieves significant RCS reduction in the frequency range of 9.6–22.6 GHz with maximum in‐band RCS reduction of 21 dB and maximum out of band RCS reduction of 34 dB.

Backfire suppressed low profile aperture coupled stacked patch antenna backed by a high impedance surface (HIS) reflector for UHF RFID reader applications

“…The advantages of placing a HIS reflector under the antenna is to suppress backfire radiation although it increases antenna thickness and size due to the reflector. Antenna polarization or radar cross-section (RCS) can also be manipulated by the HIS reflector [14, 15]. In [19, 20], cross-pol gain was highly suppressed by introducing novel feeding networks.…”

“…In this work, the feasibility of the HIS surface implementation at UHF band is studied and demonstrated. There are reported research efforts on patch antenna backed by a reactive surface or a HIS reflector but this work is the first application of such kind of specific configuration at UHF RFID band [11–15].…”

Integrated design of large and medium‐sized low profile frequency reconfigurable antenna array

“…[1][2][3][4][5][6] The electromagnetic band gap (EBG) and defected ground structure (DGS), or other metamaterials, has demonstrated a good potential in antenna to reduce size or improve efficiency, or achieve other performance. [7][8][9][10][11][12][13][14][15][16][17][18][19] Among these structures, EBG structure is widely applied in antenna systems. Combining reconfigurable antenna technology with EBG, a series of limitations existing in the conventional schemes have been broken through, and some high performance antennas have been developed.…”

Multi-State Circularly Polarized Antenna Based on the Polarization Conversion Metasurface With Gain Enhancement

“…The structure obtained an AR BW bigger than 200 MHz, but the structure was large and very complex. The polarization conversion metasurface (PCM) is a kind of artificial surface that can effectively convert a linearly polarized wave into the cross-polarized one [13]- [18]. In recent decades, various antennas based on PCM have been widely researched.…”