Equivalent circuit model for linear to circular polarisation converters based on bandpass freestanding FSS screens

Clendinning, Sarah; Cahill, R.; Zelenchuk, Dmitry; Fusco, V.F.

doi:10.1049/cp.2018.1438

Cited by 3 publications

(12 citation statements)

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“…The topology of the single layer freestanding LP to CP polarization convertor which is reported in this article was optimized for maximum AR BW using guidelines given in Reference . An additional degree of freedom is exploited in the design to further increase the AR BW of the transmitted waves by deploying dielectric layers to tailor the amplitude and phase response of the TE and TM waves . A schematic of the freestanding and embedded unit cells are presented in Figure 1A,B, respectively.…”

Section: Principle Of Operationmentioning

confidence: 99%

“…The S 21 responses were post processed in MATLAB using equations given in Reference to obtain the AR values at each frequency. Table summarizes the unit cell dimensions for each of the two optimized structures, which were designed for normal incidence operation . In the numerical model, the E vector of the impinging LP wave is orientated at an angle of 45° with respect to the XY axes depicted in Figure 1A.…”

Section: Normal and Oblique Angle Responsementioning

confidence: 99%

“…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.…”

Section: Introductionmentioning

confidence: 98%

“…In References , the plane wave transmission response of a FSS filter was shaped by inserting an array of linear slots between two dielectric layers. This observation was used in Reference to create an innovative cross‐slot polarization convertor design, which exhibits an AR BW of 7.9% working at normal incidence.…”

Section: Introductionmentioning

confidence: 99%

“…The purpose of this article is to evaluate the electromagnetic performance of single layer freestanding and dielectric embedded aperture FSS screens, when these are illuminated by LP plane waves over a field of view (FOV) ±15° and ±30° in the cardinal planes. The two LP to CP polarization convertors were designed to work at normal incidence and achieve the maximum possible 3 dB AR BW centered at a frequency around 10 GHz . At oblique incidence the AR minimum shifts to a lower frequency, thus reducing the BW for oblique incidence operation and for each of the two FOV cases studied.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

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

Clendinning

Cahill

Zelenchuk

et al. 2020

Micro & Optical Tech Letters

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In this article, we investigate the electromagnetic behavior of freestanding and dielectric embedded frequency selective surface (FSS) based linear to circular polarization convertors. The two structures were designed to operate in transmission mode at normal incidence and yield the lowest value for axial ratio (AR) at frequencies around 10 GHz. In addition to providing mechanical robustness, a 72% increase in the 3 dB AR bandwidth (BW) is achieved when the 140‐μm thick perforated FSS sheet is inserted between two 5‐mm thick polytetrafluoroethylene (PTFE) slabs. At oblique incidence a downward shift in frequency is observed, however the BW is still significantly larger than the results obtained for the freestanding periodic array within a field of view of ±30° in the cardinal planes. Spectral transmission measurements presented for both anisotropic media verify the simulated results.

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Section: Principle Of Operationmentioning

confidence: 99%

Section: Normal and Oblique Angle Responsementioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Clendinning

Cahill

Zelenchuk

et al. 2020

Micro & Optical Tech Letters

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Bandwidth optimization of linear to circular polarization convertors based on slot FSS

Clendinning

Cahill

Zelenchuk

et al. 2019

Micro & Optical Tech Letters

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This study reports an evaluation of the maximum axial ratio (AR) bandwidth which is obtainable from a transmission type linear (LP) to circular polarization (CP) convertor working at normal incidence. The anisotropic bandpass FSS structure is composed of a thin metal surface perforated with an array of unequal length orthogonal slots. Full wave simulations are used to study the effect of changing the physical dimensions of the individual slot structural parameters by computing the amplitude and phase of the TE and TM transmitted waves at normal incidence over the frequency range 8‐12 GHz. The results are used to establish design guidelines which are employed to obtain the optimum topology for a single layer LP to CP convertor working at a center frequency of 10 GHz. The numerical results which are shown to be in close agreement with measurements, demonstrate that this class of periodic structure can be designed to give a 3 dB AR fractional bandwidth of 5.0%.

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Single screen cross slot polarization convertors with enhanced bandwidth and frequency selective filtering performance

Clendinning¹,

Cahill²,

Zelenchuk³

et al. 2021

Journal of Electromagnetic Waves and Applications

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This paper describes a new design strategy which is used to obtain a fivefold increase in the 3 dB axial ratio bandwidth of linear to circular polarization convertors based on anisotropic frequency selective surfaces composed of single screens of cross slots. The performance improvement is obtained by employing stratified dielectric media to carefully tailor the shape of the TE and TM spectral transmission responses. We demonstrate that a bandwidth of 24.5% can be achieved at a center operating frequency of 10.6 GHz using an array of unequal length cross-slots embedded centrally between two 2.25 mm thick dielectric slabs (ε r = 9.0). Moreover it is shown that the inherent self-filtering behavior of the structure provides greater rejection of unwanted signals than designs embedded in lower permittivity material. Computed and experimental axial ratio results are compared to verify the new design methodology.

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Equivalent circuit model for linear to circular polarisation converters based on bandpass freestanding FSS screens

Cited by 3 publications

References 0 publications

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

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

Bandwidth optimization of linear to circular polarization convertors based on slot FSS

Single screen cross slot polarization convertors with enhanced bandwidth and frequency selective filtering performance

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