Comparative Optical Analysis of Offset Reflector Antenna in GRASP
In this paper comparison of Reflector Antenna
analyzing techniques based on wave and ray nature of optics is
presented for an offset reflector antenna using GRASP (General
Reflector antenna Analysis Software Package) software. The results
obtained using PO (Physical Optics), PTD (Physical theory of
Diffraction), and GTD (Geometrical Theory of Diffraction) are
compared. The validity of PO and GTD techniques in regions around
the antenna, caustic behavior of GTD in main beam, and deviation of
GTD in case of near-in sidelobes of radiation pattern are discussed.
The comparison for far-out sidelobes predicted by PO, PO + PTD
and GTD is described. The effect of Direct Radiations from feed
which results in feed selection for the system is addressed.
[1] J. Keller, Geometrical theory of diffraction. In Calculus of Variations
and Applications, Ed. L. M. Graves. New York: McGraw-Hill, pp. 27-
52, 1958.
[2] J. Keller, Geometrical theory of diffraction. J. Opt. Soc. Am. 52, pp.
116-130, February 1962.
[3] L.C. Godara, Handbook of Antennas in Wireless Communications, CRC
press, 2001.
[4] E.F. Knott, and T.B.A. Senior, "Comparison of three high-frequency
diffraction techniques", Proc. IEEE, Vol. 62, No. 11, pp. 1468-1474,
1974.
[5] P. Pathak, Techniques for High-Frequency Problems. In Antenna
Handbook, Y.T. Lo and S.W. Lee, Eds., New York: Van Nostrand
Reinhold, ch. 4, 1988.
[6] B. Philips, M Philippakis, G Y Philippou and D J Brain, Study of
Modelling Methods for Large Reflector Antennas, ERA Report 96-0902,
September, 1996.
[7] K. Pontoppidan, GRASP9, Technical Description, TICRA, Copenhagen,
Denmark, 2005.
[8] Y. R. Samii, A comparison between GO/aperture-field and Physical-
Optics methods for offset reflectors, lEEE Trans. Antennas and Prop.,
Vol. AP-32, No. 3, March 1984.
[9] A. Sommerfeld, Mathematische theorie der diffraktion. Math. Ann. 47,
pp. 314-374, 1986.
[10] P. Ufimtsev, Elementary edge waves and the physical theory of
diffraction. Electromagnetics 11, pp. 125-160, April-June 1991.
[11] G. Ahmad, Review of high frequency analyzing techniques for reflector
antenna, 12th IEEE INMIC conference, 2008, to be published.
[1] J. Keller, Geometrical theory of diffraction. In Calculus of Variations
and Applications, Ed. L. M. Graves. New York: McGraw-Hill, pp. 27-
52, 1958.
[2] J. Keller, Geometrical theory of diffraction. J. Opt. Soc. Am. 52, pp.
116-130, February 1962.
[3] L.C. Godara, Handbook of Antennas in Wireless Communications, CRC
press, 2001.
[4] E.F. Knott, and T.B.A. Senior, "Comparison of three high-frequency
diffraction techniques", Proc. IEEE, Vol. 62, No. 11, pp. 1468-1474,
1974.
[5] P. Pathak, Techniques for High-Frequency Problems. In Antenna
Handbook, Y.T. Lo and S.W. Lee, Eds., New York: Van Nostrand
Reinhold, ch. 4, 1988.
[6] B. Philips, M Philippakis, G Y Philippou and D J Brain, Study of
Modelling Methods for Large Reflector Antennas, ERA Report 96-0902,
September, 1996.
[7] K. Pontoppidan, GRASP9, Technical Description, TICRA, Copenhagen,
Denmark, 2005.
[8] Y. R. Samii, A comparison between GO/aperture-field and Physical-
Optics methods for offset reflectors, lEEE Trans. Antennas and Prop.,
Vol. AP-32, No. 3, March 1984.
[9] A. Sommerfeld, Mathematische theorie der diffraktion. Math. Ann. 47,
pp. 314-374, 1986.
[10] P. Ufimtsev, Elementary edge waves and the physical theory of
diffraction. Electromagnetics 11, pp. 125-160, April-June 1991.
[11] G. Ahmad, Review of high frequency analyzing techniques for reflector
antenna, 12th IEEE INMIC conference, 2008, to be published.
@article{"International Journal of Electrical, Electronic and Communication Sciences:59841", author = "Ghulam Ahmad", title = "Comparative Optical Analysis of Offset Reflector Antenna in GRASP", abstract = "In this paper comparison of Reflector Antenna
analyzing techniques based on wave and ray nature of optics is
presented for an offset reflector antenna using GRASP (General
Reflector antenna Analysis Software Package) software. The results
obtained using PO (Physical Optics), PTD (Physical theory of
Diffraction), and GTD (Geometrical Theory of Diffraction) are
compared. The validity of PO and GTD techniques in regions around
the antenna, caustic behavior of GTD in main beam, and deviation of
GTD in case of near-in sidelobes of radiation pattern are discussed.
The comparison for far-out sidelobes predicted by PO, PO + PTD
and GTD is described. The effect of Direct Radiations from feed
which results in feed selection for the system is addressed.", keywords = "Geometrical optics & geometrical theory of
diffraction, offset reflector antenna, physical optics & physical
theory of diffraction, PO & GO comaprison.", volume = "2", number = "9", pages = "2004-4", }