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Title: Electrically "Long" dipoles in a collocated/Orthogonal triad-for direction finding and polarization estimation
Authors: Wong, KT 
Song, Y
Fulton, CJ
Khan, S 
Tam, WY 
Keywords: Antenna arrays
Array signal processing
Dipole antennas
Dipole arrays
Direction-of-arrival (DOA) estimation
Directive antennas
Parameter estimation
Polarization estimation
Radio direction finding
Signal processing antennas
Issue Date: 2017
Publisher: Institute of Electrical and Electronics Engineers
Source: IEEE transactions on antennas and propagation, Nov. 2017, v. 65, no. 11, p. 6057-6067 How to cite?
Journal: IEEE transactions on antennas and propagation 
Abstract: In dipole-antenna array signal-processing algorithm development, research has focused on "short dipoles" whose physical length (L) is under (1/10) of a wavelength lambda. Such electrically "short" dipoles have very small input impedances, rendering such "short" dipoles to be inefficient radiators. Practical dipoles, with an electrical length of (L/lambda) is an element of [0.1, 1], have notably larger input impedance, hence making them better radiators. Of such practical dipoles, this paper investigates their use for azimuth-polar direction finding and for polarization estimation. This paper will first present the measurement model (i.e., array manifold) of a triad of such practical dipoles, collocated in space and orthogonally oriented. This paper will then develop the corresponding closed-form algorithms to estimate the bivariate azimuth-elevation direction-of-arrival or the bivariate polarization. Such closed-form algorithms previously have been unavailable in the existing literature for such a triad of electrically "long" dipoles of pragmatic radiation efficiency.
ISSN: 0018-926X
EISSN: 1558-2221
DOI: 10.1109/TAP.2017.2748183
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