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88 results on '"Ligthart, L"'

2. Wide Scanning Characteristics of Sparse Phased Array Antennas Using an Analytical Expression for Directivity.

Author

Kedar, Ashutosh and Ligthart, L. P.

Subjects
*PHASED array antennas, *ANTENNA radiation patterns, *ARBITRARY constants, *FINITE element method, *GEOMETRY
Abstract

This paper presents a generalized analytical expression for directivity of phased array antennas (PAAs). It includes important design consideration of PAAs such as arbitrary element type and array geometry, complex excitations, mutual coupling, scan angle, and embedded element pattern. We also present an approximate expression of directivity, helpful for quick analysis of large PAAs overcoming computing time constraints of analytical expressions. It provides a quick PAA design tool for predicting accurate locations of blind spots in desired scan volume due to the chosen array geometry. This paper also presents the study on wide scan characteristics of periodic sparse PAAs using the proposed expressions. [ABSTRACT FROM AUTHOR]

Published
2019
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24. External calibration of the PARSAX dual-channel FMCW polarimetric agile radar system.

Author

Li, Zhijian, Ligthart, L. P., Huang, Peikang, Lu, Weining, van der Zwan, W. F., Krasnov, O. A., Yarovoy, A., and Zhu, Weiqiang

Abstract

Calibration is an important aspect of polarimetric radar design. In order to determine the accurate backscattering matrix (BSM) of a target, accurate measurements of the relative amplitudes and phases of the returned signals scattered by the targets are needed. This paper formulates the polarization BSM of a polarimetric agile radar system explicitly. The paper focuses on the external calibration of the radar system using a rotatable dihedral corner reflector. Comparison between the measurement results and the theoretical values of the polarization BSM of the dihedral demonstrates the validity of our calibration approach. [ABSTRACT FROM PUBLISHER]

Published
2012

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