Low-loss lens-array for wide-scan millimeter-wave beam-steering

Cheng, Chih‐Chieh; Abbaspour-Tamijani, A.

doi:10.1109/aps.2007.4396516

2007 IEEE Antennas and Propagation Society International Symposium 2007

DOI: 10.1109/aps.2007.4396516

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Low-loss lens-array for wide-scan millimeter-wave beam-steering

Chih‐Chieh Cheng

A. Abbaspour-Tamijani

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Cited by 2 publications

References 9 publications

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Evaluation of a Novel Topology for MEMS Programmable Reflectarray Antennas

Cheng

Abbaspour-Tamijani

2009

IEEE Trans. Microwave Theory Techn.

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This paper presents a programmable reflectarray topology for passive beamforming at millimeter-wave frequencies. This topology relies on reconfigurable antenna-filter-antenna (AFA) elements and has a multilayer structure that makes it suitable for implementation as a monolithic MEMS device. We address different aspects of design, modeling, and characterization of the AFA elements and the reflectarray. A 2-bit reflective AFA element is introduced and studied using full-wave and hybrid models. An approximate bistatic reflectance model is proposed and used in a ray-based formulation to predict the radiation pattern of the reflectarray. The principle of operation, scanning performance, and modeling approach are validated experimentally using proof-of-concept reflectarray prototypes designed for 35 GHz. Pattern measurements in offset-fed and folded center-fed configurations show that the proposed topology is capable of wide-angle scanning in two dimensions. The measured scan loss is less than 2 dB for up to 45 scan in both -and -planes. The cross-pol level is 11 dB in all cases, and the worst case sidelobe level is 9 dB. A near-scan-blindness behavior is observed for 60 scan in the -plane. These results are consistent with the simulations, indicating the effectiveness of the bistatic reflectance model.Index Terms-Antenna-filter-antenna (AFA), beam steering, electronically scanned array (ESA), microelectromechanical systems (MEMS), reflectarray, scan blindness.

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Evaluation of a Novel Topology for MEMS Programmable Reflectarray Antennas

Cheng

Abbaspour-Tamijani

2009

IEEE Trans. Microwave Theory Techn.

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Enhancing the Directivity of Phased Array Antennas Using Lens-Arrays

Abbaspour-Tamijani¹,

Zhang²,

Pan³

2013

PIER M

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Small phased-array antennas can be combined with dielectric lenses or planar lens-arrays to form directive beam-steering system. The use of the lens increases the size of the radiating aperture and enhances the directivity of the phased array, but it also reduces its scan field of view. However, the effect can be controlled by properly designing the phase delay profile across the lens. This paper presents the formulation and methodology for designing modified lenses that can allow the desired scan angle. The utility and limitations of the proposed approach will be illustrated by considering several design examples. Simulations suggest that a directivity enhancement of > 2 dB and wide scan field of view (up to 45 • off boresight) can be obtained for compact radiation systems employing small lenses and short separations between the lens and phased array. Larger directivity improvements in the range of tens of dB's are possible in systems with limited scanning capability by employing large lenses and greater phased array-lens separation. Ease of implementation and the ability of the proposed topology to adapt to the system requirements make this topology an interesting candidate for various millimeter-wave radio applications.

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Low-loss lens-array for wide-scan millimeter-wave beam-steering

Cited by 2 publications

References 9 publications

Evaluation of a Novel Topology for MEMS Programmable Reflectarray Antennas

Evaluation of a Novel Topology for MEMS Programmable Reflectarray Antennas

Enhancing the Directivity of Phased Array Antennas Using Lens-Arrays

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