A Method of Producing Broad-Band Circular Polarization Employing an Anisotropic Dielectric

Kirschbaum, H. S.; Chen, S.

doi:10.1109/tmtt.1957.1125140

Cited by 46 publications

(3 citation statements)

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“…The constitutive relations of chiral media are expressed as [15] (5) (6) where and represent the usual permittivity and permeability, and is the chirality parameter. Such materials are circularly 1536-1225/$25.00 © 2007 IEEE birefringent, and their eigenmodes are an RHCP and a left-hand circularly polarized (LHCP) wave, with two different wavenumbers and given by (7) The SOP of the wave in chiral media can also be represented in the ABCD matrix, written as [13] (8) where is the Faraday rotation angle.…”

Section: Formulation and Mpgamentioning

confidence: 99%

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Axial Ratio Bandwidth Enhancement for Quarter-Wave Polarizer Using a Genetic Algorithm

Lin

2007

Antennas Wirel. Propag. Lett.

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This investigation presents axial ratio bandwidth enhancement for a quarter-wave polarizer composed of mutilayered uniaxial anisotropic media and chiral media using a genetic algorithm. In our design, the constitutive parameters of materials can be arbitrary. This broadband polarizer can be realized through the adjustment of the thickness of materials. The nearly optimal and suitable thickness of each cell is determined by using a genetic algorithm. Two numerical examples with three and five cells are presented to validate the design. The axial ratio bandwidths of about 84.1% and 92.8% can be achieved, more than the double of the maximum theoretical bandwidth for the case of the single uniaxial anisotropic slab.

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Section: Formulation and Mpgamentioning

confidence: 99%

“…This letter presents a broad AR bandwidth quarter-wave polarizer composed of mutilayered anisotropic and chiral slabs using genetic algorithm (GA). Anisotropic media are often used as a polarizer [5], [6], because they can change the state of polarization (SOP). These media are found in nature, such as crystals, or are artificial [7].…”

Section: Introductionmentioning

confidence: 99%

Axial Ratio Bandwidth Enhancement for Quarter-Wave Polarizer Using a Genetic Algorithm

Lin

2007

Antennas Wirel. Propag. Lett.

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“…Dielectric plates in a waveguide can also introduce circular polarization. An anisotropic dielectric filled waveguide polarizer was proposed as early as 1957 [12]. Since the dielectric constants for -and -polarizations are and , respectively, propagation constants for the two polarizations are different.…”

Section: Introductionmentioning

confidence: 99%

A Circular Polarizer Designed With a Dielectric Septum Loading

Wang

Chien

Wang

et al. 2004

IEEE Trans. Microwave Theory Techn.

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This paper presents a simple method to realize a circular polarizer by inserting a dielectric septum in the middle of the cylindrical waveguide. Since fixing slots are built to precisely locate the septum, dual-compensation slots are made in the orthogonal plane to balance the effects of the fixing slots. The measured axial ratio is smaller than 0.5 dB and the phase difference is flat in the frequency range from 60 to 62.25 GHz. In addition, the return losses are better than 13 dB for both and polarizations in the same frequency range. This design has the added advantage that poor phase differences resulting from fabrication error or an inaccurate dielectric constant can easily be improved by adjusting the length of the inserted dielectric septum.

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Terahertz Lens Antennas

Cheung

Chan

et al. 2022

Antenna and Array Technologies for Future Wireless Ecosystems

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A Method of Producing Broad-Band Circular Polarization Employing an Anisotropic Dielectric

Cited by 46 publications

References 0 publications

Axial Ratio Bandwidth Enhancement for Quarter-Wave Polarizer Using a Genetic Algorithm

Axial Ratio Bandwidth Enhancement for Quarter-Wave Polarizer Using a Genetic Algorithm

A Circular Polarizer Designed With a Dielectric Septum Loading

Terahertz Lens Antennas

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