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Comparison of PO and PTD Analyses of Offset Reflector Antenna Patterns
Makoto ANDO Ryokyo OKADA Tsuyoshi KITAOKA
IEICE TRANSACTIONS on Communications
Publication Date: 1992/02/25
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Antennas and Propagation
PO, PTD, XPD, GTD, parabola,
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Physical optics (PO) have been extensively used in radiation pattern analysis of offset parabola. Physical Theory of Diffraction (PTD) proposed later has better accuracy. This paper presents an analytical/numerical comparative study of these methods to demonstrate the limitations of PO. PO envelope errors in co-polar patterns are expressed as functions of antenna parameters. Serious PO errors in cross polarization prediction are pointed out for antennas with cross-polar suppressing feeds polarized in the plane of asymmetry.