Communications: directive radio wave systems and devices (e.g. – Directive – Including polarized signal communication transmitter or...
Patent
1985-09-12
1988-04-26
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including polarized signal communication transmitter or...
342360, H01Q 2106, H01Q 2124, H04B 710
Patent
active
047407905
ABSTRACT:
Method for measuring polarization of antennas utilizing three-antenna methods and far-field scanning techniques where the measured data is processed via digital Fourier transform. In one method, the normalized received phasor voltage for transmission between each of three antennas measured pairwise is digitally recorded as a continuously sampled function of relative roll angle between the antennas as one of the antennas is rolled in a continuous manner. The recorded data is digitally processed via a one-dimensional Discrete Fourier Transform to yield transformed quantities relating to the polarization of the antennas under test. From these quantities, standard polarization parameters including the circular polarization ratio, axial ratio, tilt angle and sense of the electric field polarization ellipse of each antenna may be obtained. In another method, the antenna in each pair which is not continuously rotated is rotated in incremental fashion while the normalized received phasor voltage for transmission between each pair of antennas is digitally recorded. The recorded data for this second method is digitally processed via a two-dimensional Fast, Discrete or other Fourier transform. This step/scan procedure further compensates for test range ambient and reflected noise and for transmitter and receiver RF path variations compared to the single scan procedure of the first method.
REFERENCES:
E. Christensen, J. Hansen, et al., Experimental Spherical Near-Field Antenna Test Facility, Phase II Final Report, Electro-Magnetics Institute, Technical University of Denmark, European Space Agency Contract Report, pp. 93-99, 10-1-10-17, 11-1-11-26, Dec. 1981.
C. Foley and J. Lamb, "Use a Personal Computer and DFT to Extract Data from Noisy Signals," EDN, vol. 29, No. 7, pp. 215-222, 224, 227-228, 230, and 232, Apr. 5, 1984.
T. Hickman, J. Hollis and L. Clayton, "Polarization Measurements," Chapter 10 of Microwave Antenna Measurements, J. Hollis, T. Lyon and L. Clayton, eds., Scientific Atlanta, Inc., pp. 10-1-10-38, 10A1-10A4, Atlanta, Ga., 1970.
E. Joy and D. Paris, "A Practical Method for Measuring the Complex Polarization Ratio of Arbitrary Antennas," IEEE Transactions on Antennas and Propagation, vol. AP-21, No. 4, pp. 432-435, Jul., 1973.
A. Newell, "Improved Polarization Measurements Using a Modified 3-Antenna Technique," Proceedings of the IEEE International Antennas and Propagation Symposium, Urbana-Champaign, IL, Jun. 2-4, 1975, pp. 337-340, 1975.
A. Newell and D. Kerns, "Determination of Both Polarization and Power Gain of Antennas by a Generalized 3-Antenna Measurement Method," Electronics Letters, vol. 7, No. 3, pp. 68-70, Feb. 11, 1971.
A. Newell, R. Baird and P. Wacker, "Accurate Measurement of Antenna Gain and Polarization at Reduced Distances by an Extrapolation Technique," IEEE Transactions on Antennas and Propagation, vol. AP-21, No. 4, pp. 418-431, Jul., 1973.
P. Wacker, "Non-Planar Near-Field Measurements: Spherical Scanning," NPSIR 75-809, (55 pages), Jun. 1975.
Hess, Jr. Doren W.
Jones John R.
Blum Theodore M.
Scientific-Atlanta, Inc.
LandOfFree
Antenna polarization measuring methods does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Antenna polarization measuring methods, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Antenna polarization measuring methods will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-822480