Multiband Reflection and Transmission mode Linear to Circular Polarizer integrated Microstrip Patch Antenna
14 Dec 2020-
TL;DR: In this article, an elliptical patch wideband antenna operating from 5-13.8 GHz is integrated with a single layer metal backed modifed I shaped reflection mode circular polarizer (CP).
Abstract: Two Multiband Circular Polarization Conversion (CPC) structures using FSS have been introduced for practical applications in this article. An elliptical patch wideband antenna operating from 5-13.8 GHz is integrated with a novel single layer metal backed modifed I shaped FSS based reflection mode circular polarizer (CP).This polarizer operates at multiple frequencies 7.2, 8, 8.2, 8.3 and 10.4 GHz respectively . Further, a single layer transmission mode FSS based polarization converter comprising double P shaped unit cells is realized which accomplishes CP generation at 10.2, 10.4, 10.6, 10.8, 11 and 11.2 GHz . An axial ratio of less than 3 dB and phase difference of 90° (or an odd multiple of 90°) is obtained between the TE and TM transmissions which ratifies the generation of CP at multiple frequencies . The radiation performance of the microstrip patch antenna is undegraded when used in conjunction with either of the LP-CP polarization converters at the operating frequencies as validated through full wave simulations in HFSS. The formation of CP is illustrated through E field distribution and polarization ellipses.
References
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TL;DR: In this article, a wideband circularly polarized (CP) L-slot antenna single fed by L-shaped feed line is designed, which truncates one of the corners of the antenna element.
Abstract: A wideband circularly polarized (CP) L-slot antenna single fed by L-shaped feed line is designed. Wideband CP is obtained by truncating one of the corners of the antenna element. This arrangement introduces orthogonal components with quadrature phase difference to excite circularly polarized wave. A bandwidth of 46.5% (2.18-3.5 GHz) is achieved with an dB and dB. Good agreement between measured and computed results is achieved. Moreover, parametric study results are presented.
167 citations
TL;DR: In this paper, a cross polarization conversion (CPC) structure using metasurface over wide bandwidth has been presented for practical applications, which is made of metallic patch of single circular split-ring imprinted on top surface of a metal-backed single layer dielectric substrate.
Abstract: A cross polarization conversion (CPC) structure using metasurface over wide bandwidth has been presented for practical applications in this article. The unit cell of the proposed metasurface is made of metallic patch of single circular split-ring imprinted on top surface of a metal-backed single layer dielectric substrate. Full width half maxima bandwidth of polarization conversion ratio (PCR) of 11.12 GHz is realized along with wide bandwidth of 9.92 GHz extending from 6.06 GHz to 15.98 GHz with more than 0.8 PCR magnitude is realized using suitable optimization of the geometrical dimensions. Four distinct PCR peaks are observed at 6.56 GHz, 10.38 GHz, 15.12 GHz and 16.68 GHz. The polarization conversion phenomena at these four frequencies have been analyzed in the light of electromagnetic resonances. The roles of several geometrical parameters of the design are simultaneously investigated. The proposed structure has been studied under oblique incidence, both for TE and TM polarizations. Wideband polarization conversion characteristics upto 45° incident angles have been observed for both cases. A prototype of the proposed metasurface is fabricated and experimental results are in good agreement with the simulated responses. The proposed structure is ultra-thin; ~ λ/11.8 with respect to the centre frequency of the CPC bandwidth.
64 citations
TL;DR: In this article, a polarization rotator based on substrate integrated waveguide (SIW) is proposed, which transmits a wave rotated of 90° with respect to the incident one in one of the two bands maintaining unchanged the polarization in the other one.
Abstract: A polarization rotator based on substrate integrated waveguide (SIW) is proposed in this article. The rotator is designed as a dual-band, single-layer, frequency-selective surface (FSS) that transmits a wave rotated of 90° with respect to the incident one in one of the two bands maintaining unchanged the polarization in the other one. Other than the design and characterization of the rotator, its application to a linear-to-circular dual-band polarizer is also investigated. To this purpose, the rotator is coupled to a conventional meander line polarizer generating orthogonal circular polarizations (CP) in the two bands. This configuration is useful in SatCom applications where the required high isolation between TX and RX channels is obtained assigning orthogonal polarizations to the two bands. As a design example, a prototype is designed and experimentally validated in the SatCom K-/Ka -bands. Measured performance shows an isolation between the TX and RX channels of more than 35 dB and insertion losses which do not exceed 1.5 dB in the two operating bands.
45 citations
TL;DR: In this article, a broadband and wide-angle scanning linear polarization (LP-to-circular polarization) converter based on a dual-layer structure is presented, which can be integrated into any LP antenna system to generate CP without significantly affecting the antenna performances.
Abstract: A broadband and wide-angle scanning linear polarization (LP)-to-circular polarization (CP) converter based on a dual-layer structure is presented. The elementary cell is composed of conventional Jerusalem crosses (JCs). The design procedure is based on transmission line circuit model and on full-wave simulations. The proposed equivalent circuit has been generalized to include the oblique incidence in the model. Simulated results demonstrate a 24% axial ratio bandwidth for an incidence angle $\theta = \pm 50^{\circ }$ in both x z and y z planes. The proposed converter provides a unique combination of wide bandwidth, thin profile, and stable response with respect to the angle of incidence. It can be integrated into any LP antenna system to generate CP without significantly affecting the antenna performances.
39 citations
TL;DR: In this paper, a dual-band reflection-mode circular polarizers (RMCPs) with wide bandwidth and wide-view at the operating frequencies are introduced. But the proposed RMCPs are based on dual-layer rectangular patches on both sides of a substrate, separated by a foam or air layer from the ground plane.
Abstract: A new kind of dual-band reflection-mode circular polarizers (RMCPs) is introduced with wide bandwidth and wide-view at the operating frequencies. The proposed RMCPs are based on dual-layer rectangular patches on both sides of a substrate, separated by a foam or air layer from the ground plane. Required TE susceptance of the first layer patches to produce circular polarization is calculated using the equivalent transmission line model. Dimensions of the RMCP are obtained using parametrical study for the two frequency bands, 1.9–2.3 GHz and 7.9–8.3 GHz. In addition, it is indicated that the accepted view angle and bandwidth of the proposed dual-layer RMCP are improved compared with the single layer RMCP, significantly. Moreover, a tradeoff is observed for the dual-layer RMCP on the bandwidths of ${X}$ -band and ${S}$ -band that can be controlled by propagation angle of the incident wave. The proposed RMCP has 30.5% and 33.7% bandwidths for less than 3 dB axial ratio with incident angles ${\theta }_{\mathrm {max}}=50 {^{\circ }}$ and ${\theta }_{\mathrm {min}}=35 {^{\circ }}$ . Finally, simulation results are met by the measurement for three angles of the incident wave.
14 citations