Abstract
Frequency-selective surfaces (FSSs), have various applications in microwave electromagnetics. This paper reports a solution to the current FSS challenges of flexibly, low profile, simple fabrication and polarization control using a novel structure operating across X and Ku frequency bands where a linearly polarized wave is rotated by 90°. The FSSs were fabricated by laser engraving a thin layer of $5\mu \text{m}$ aluminum on a $65~\mu \text{m}$ Mylar substrate with a relative permittivity of 2.7, and separated by a dielectric spacing layer of 0.9 mm polypropylene substrate, with a relative permittivity of 3. The co and cross-polarized reflection and transmission response of the structure was investigated using numerical modeling and was measured experimentally. A parametric study was also conducted focusing on key performance indicators, and specifically the bandwidth of the structure. The novelty of this polarization rotation structure lies in its ultra-thin profile ( $0.034~\lambda _{0}$ ), flexibility and significant transmission bandwidth. The fabricated prototypes experimental results were in good agreement with the simulated results, with a simulated −6 dB bandwidth of 61% and a measured −6dB bandwidth of 60%. Applications include antenna radomes where polarization is particularly important, as well as other polarization filtering applications which require a conformal low profile structure.
Highlights
Frequency Selective Surfaces (FSSs) have unique electromagnetic properties
The transmission results show good agreement, where the co-polarized magnitude is below -10 dB and the cross-polarized magnitude was above -10 dB, at around -3 dB to -4 dB for both the simulated and measured cases
In this paper, an ultra-thin broadband transmission FSS rotation polarizer has been presented. This structure uses coupling between rotated FSS layers to select, rotate and transmit the incoming polarization
Summary
Frequency Selective Surfaces (FSSs) have unique electromagnetic properties. FSSs are periodic arrays comprised of conductive elements supported by a dielectric substrate, where the geometry of the elements govern its frequency response [1]. This is due to the resonant nature of the slot elements which are approximately a half wavelength and are inversely proportional to the frequency. C. EFFECT OF SEPERATION DISTANCE The dielectric spacing affects both the operating frequency range and bandwidth of the structure as seen, where the total separation distance, h, is the combined height of the two Mylar substrates, h , as well as the Polypropylene spacer h .When the separation between conductive FSS is small, such as when the spacing is 0.3 mm, where the copolarized reflection magnitudes do not fall below -10 dB and possess two distinct resonances which are very far apart.
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