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The electric field magnitude (a) and the distinctive Huygens-like directivity pattern (b) for the optimized C2 configuration. The aperture extent is 2θ = 180° and the outer shell radius is b = 41.7 mm. The minimum PR value is 36.64 dB and the maximum of the directivity pattern, 3.52 (=5.46 dB), occurs when φ = 64.00°.
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