A phased array antenna element which provides good circular polarization over a broad sector of coverage in an array environment has been designed and evaluated. The concept is the superposition of complementary antennas, the dipole, and the slot, to achieve equalE- andH-plane patterns in the array environment. This element, when evaluated in a large test array, demonstrated an ellipticity of less than±2.0dB over a coverage of±60degrees. By proper control of the excitation of the two isolated antennas any desired polarization can be achieved.
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Cox et al. (1970) studied this question.
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