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Modern Antenna Design - Radio Astronomy

8-8 Focal Plane Fields, 396 8-9 Feed Mismatch Due to the Re ector, 397 8-10 Front-to-Back Ratio, 399 8-11 Offset-Fed Re ector, 399 8-12 Re ections from Conic Sections, 405 8-13 Dual-Re ector Antennas, 408 8-13.1 Feed Blockage, 410 8-13.2 Diffraction Loss, 413 8-13.3 Cassegrain Tolerances, 414 8-14 Feed and Subre ector Support Strut Radiation, 416

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