Wideband Transmit Arrays Based on Anisotropic Impedance Surfaces for Circularly Polarized Single-Feed Multibeam Generation in the Q-Band

In this article, a class of wideband transmit arrays (TAs), composed of cascaded anisotropic impedance surfaces (AISs), for circularly polarized (CP) multibeam generation from a single feed horn are reported. The dispersionless phase compensation is achieved by the Berry phase (BP) via imposing a sp...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2020-01, Vol.68 (1), p.217-229
Main Authors: Jiang, Zhi Hao, Kang, Lei, Yue, Taiwei, Hong, Wei, Werner, Douglas H.
Format: Article
Language:English
Subjects:
Anisotropic impedance surface (AIS)
Anisotropy
Arrays
Bandwidths
Broadband
Circular polarization
Feeds
Impedance
Millimeter waves
millimeter-wave
Modelling
multibeam
Pencil beams
Performance evaluation
Receiving antennas
shaped beam
Surface impedance
transmit arrays (TAs)
Transmitting antennas
Unit cell
Wideband
Wireless communications
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Summary:In this article, a class of wideband transmit arrays (TAs), composed of cascaded anisotropic impedance surfaces (AISs), for circularly polarized (CP) multibeam generation from a single feed horn are reported. The dispersionless phase compensation is achieved by the Berry phase (BP) via imposing a spatially dependent rotation angle on the TA unit cells. A homogenized model for the BPTA unit cell is proposed and utilized for obtaining a wideband response by tailoring the dispersive properties of the AIS layers. Two modeling methods, an analytical vectorial field analysis and a full-wave strategy incorporating the homogenized model, were employed to efficiently evaluate the performance of the BPTAs. In order to validate the proposed unit cell and the modeling methodologies, a Q-band single-beam BPTA is demonstrated, which achieves a peak gain of 30.2 dBi and a 1 dB bandwidth of 11.1% within which the axial ratio is smaller than 2 dB. Furthermore, by employing the intersection approach for pattern synthesis, several Q-band BPTAs supporting multiple concurrent symmetric/asymmetric CP pencil beams and circular-shaped flat-top beams are designed. A BPTA prototype for producing quad CP pencil beams with unequal gain values was fabricated and characterized, yielding good performance with an overall operational bandwidth of about 11%. The proposed BPTAs are promising candidates for point-to-multipoint communication and point-to-multiregional coverage in wideband millimeter-wave communications for wireless and satellite applications.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2019.2943343