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9-10, 1992, pp. 100-106. Goebels, F.J. et al. “Arbitrary Polarization from Annular Slot Planar Antennas.” Ire Transaction on Antennas and Propagation, Jul. 1961, 8 pgs. Iijima, et al., “Highly Selective SiO2 Etch Employing Inductively Coupled Hydro-Fluorocarbon Plasma Chemistry for ...