A Single-Layer Circular Polarizer Based on Hybrid Meander Line and Loop Configuration

Abstract

VII. CONCLUSIONReflective diffractive gratings have numerous applications in optics and in electromagnetism, but their thickness can be a problem for applications at VHF frequencies or lower. We present a solution to this problem in the form of a thin diffractive panel that comprises resonant elements. A particular implementation was designed and tested for applications to prevent building perturbations to aircraft ILS. The screen measured only 1/34th of a wavelength in depth (1/15th of a wavelength with its protective weather screen). Measurements for an angle of incidence from 50 • to 55.5 • with respect to the plate normal displayed a 91% reduction in scattered field in dry conditions and a 90% reduction in simulated extreme weather conditions.The technology was developed with a particular application in mind; therefore, the main driver was whether it could be implemented simply and cheaply for applications in the VHF band. We did not pursue designs with thicknesses less than 1/34th of a wavelength as these were found to have a reduced bandwidth due to the reduced inductance. The tradeoff between thickness and bandwidth should be studied on a case-by-case basis for other applications. A video of the field trials is available on the Airbus website [12].Abstract-A new single-layer linear-to-circular polarizer is presented in this communication. A novel hybrid meander line and loop configuration is employed to transform linearly polarized field to circularly polarized field over a wide frequency band. Numerical simulations indicate that the proposed polarizer is robust under oblique and deflected illuminations. A prototype of the proposed polarizer is designed and fabricated. Measured results show that the band of axial ratio less than 3 dB ranges from 18 to 29 GHz with about 3-dB insertion loss.

Single layered swastika-shaped flexible linear-to-circular polarizer using textiles for S-band application

“…The measurement setup is illustrated in Figure , and is defined based on the procedure described in Refs. and .…”

Influence of dielectric layers on performance of transmission mode frequency selective surface based linear to circular polarization transformers

“…These strongly reject incident signals at frequencies above and below the spectral passband and therefore have the ability to provide self‐filtering of incident waves . As a general observation, the signal transmission is much lower outside of the operating frequency band than the single sheet topologies reported in References . Moreover unlike printed arrangements, radar cross‐section reduction can be achieved by printing a resistively loaded FSS (such as the one presented in Reference ) on the outermost surface of a dielectric spacer to create a microwave absorber out of band.…”

“…This structure exhibits a 3 dB AR BW of 17% centered at 14.4 GHz. More recently Fei et al showed that BWs exceeding 47% are obtainable from centrosymmetric dual‐loop elements and hybrid meander line and loop configurations …”

3D FSS polarizer for millimeter‐wave antenna applications

“…Polarizers can be realized by employing, for instance, metasurfaces, or meander lines, and so on. Among all the conversion ways, frequency selective surfaces (FSS), which provide different characteristics for horizontal and vertical components of incident.…”

“…Furthermore, a CP beam can be achieved by using a helix 2 as its axial mode offers many advantages such as good circular polarization performance over a wide frequency band. In addition to these three methods, employing polarizers [2][3][4][5][6][7][8][9] can be an efficient way to covert a linearly polarized (LP) beam into a CP beam.…”