Comparison of PO and PTD Analyses of Offset Reflector Antenna Patterns

Makoto ANDO  Ryokyo OKADA  Tsuyoshi KITAOKA  

IEICE TRANSACTIONS on Communications   Vol.E75-B    No.2    pp.76-81
Publication Date: 1992/02/25
Online ISSN: 
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.