Lens designs using rotatable phasing elements

Nakatani, D.; Ajioka, J.

doi:10.1109/aps.1977.1147732

Cited by 7 publications

(2 citation statements)

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“…At microwave frequencies, various examples include transmitarrays that can provide phase control to incident TE and TM waves using a stack of scatterers [21,22]. Transmitarrays constructed from back-to-back antennas can also provide polarization control using antennas that have been rotated to alter the polarzation of the field radiated by each antenna [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Design And Measurement of Tensor Impedance Transmitarrays For Chiral Polarization Control

Selvanayagam

Eleftheriades

2015

IEEE Trans. Microwave Theory Techn.

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Tensor impedance transmitarrays consist of layers of tensor impedance surfaces, separated by dielectric spacers. Because the surface impedance of each layer is a tensor, an arbitrarily polarized incident field is scattered into its constituent TE and TM components. This gives rise to transmitarrays capable of altering the polarization state of an incident field. Various tensor impedance transmitarray have been proposed in the literature to alter the polarization, however no comprehensive methodology has been proposed to design these structures.In this work we propose a procedure for designing tensor impedance transmitarrays using multiconductor transmission-line (MTL) theory. We treat the transmitarray by modelling free-space and the dielectric spacers as an MTL supporting TE and TM modes with each tensor impedance surface as a shunt load along the MTL. By using simple MTL concepts we can design a transmitarray to be reflectionless while controlling the transmission through the layers and thus the transmitted polarization state.We demonstrate this procedure for two classes of tensor impedance transmitarrays while also validating the design using full-wave simulation. The first class are symmetric transmitarrays which can alter a given incident polarization state into a desired polarization state. The second class are asymmetric transmitarrays which can also implement chiral polarization effects such as a linear polarization rotation and a circular polarization selectivity.

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Section: Introductionmentioning

confidence: 99%

Design And Measurement of Tensor Impedance Transmitarrays For Chiral Polarization Control

Selvanayagam

Eleftheriades

2015

IEEE Trans. Microwave Theory Techn.

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“…They required the use of non-planar archimedean spiral [9] and helix [10] elements for generating CP operation, and their receiving and transmitting elements had to be connected by a via. Later, it was found that rotating the resonators sequentially had enabled the wideband antenna array [11] to have even better CP performance.…”

Section: Introductionmentioning

confidence: 99%

Circularly Polarized Yagi-Uda-Like Transmitarray

Chew¹,

Lim²,

Lo³

2017

PIER C

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Abstract-A novel Yagi-Uda-like transmitarray is proposed for circularly polarized (CP) operation. The element consists of multiple strips stacked in parallel for achieving broad transmission phase range. By employing the design concept for the Yagi-Uda director, the transmitarray elements are made to provide the functions of phase shifter and director simultaneously. By introducing rotational offset into the stacking strips, the element is found to be able to generate circular polarization. To demonstrate the working principle, an 8-layer unit element is simulated using the Floquet method to provide a transmission phase range of 412 • . The proposed 5 × 5 full-fledged CP transmitarray is able to produce an antenna gain of 16.2 dBi, a −1-dB bandwidth of 4%, an axial-ratio bandwidth of 7%, and an aperture efficiency of 40.4%. A simple curve-fitted design equation is also given.

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A broadband compound waveguide lens

Dion

1978

IEEE Trans. Antennas Propagat.

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Lens designs using rotatable phasing elements

Cited by 7 publications

References 0 publications

Design And Measurement of Tensor Impedance Transmitarrays For Chiral Polarization Control

Design And Measurement of Tensor Impedance Transmitarrays For Chiral Polarization Control

Circularly Polarized Yagi-Uda-Like Transmitarray

A broadband compound waveguide lens

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