Electrically Long Dipoles in a Crossed Pair for Closed-Form Estimation of an Incident Source’s Polarization
Salman Khan, Kainam Thomas Wong · IEEE Transactions on Antennas and Propagation · 2019
Using two electrically long dipoles to estimate the polarizations of impinging sources, this paper pioneers signal-processing algorithms in closed forms. The existing literature on crossed-dipoles polarimetry are restricted to electrically short dipoles with an electrical length of (L/λ) ≤ (1/10), which have subpar efficiency in radiation and in reception. In contrast, this paper allows electrically long dipoles-two of them here are perpendicularly oriented but may be collocated or may be separated by a known displacement. Using such a pair of electrically long dipoles for polarization estimation, this paper proposes new closed-form formulas and derives the associated Cramér-Rao bounds.