Telecommunications – Transmitter and receiver at separate stations – Having measuring – testing – or monitoring of system or part
Patent
1978-11-06
1980-03-25
Safourek, Benedict V.
Telecommunications
Transmitter and receiver at separate stations
Having measuring, testing, or monitoring of system or part
343100AP, 343100PE, G01S 144, H04B 1700
Patent
active
041952626
ABSTRACT:
A microwave signal is transmitted from a transmitting antenna through a transfer medium to an electrically modulated and mechanically spun microwave scatterer. The scatterer may include an electric field responsive antenna, such as a dipole, for measurement of the electric field, or a magnetic field responsive antenna, such as a loop, for measurement of the magnetic field. An impedance within the scatterer is electrically modulated at an audio frequency, and the scatterer is mechanically spun at an angular frequency substantially below that at which it is electrically modulated. The scatterer thereby re-radiates to a receiving antenna a signal at the mocrowave source frequency which is modulated at both the frequency of electrical modulation and the mechanical spinning frequency of the scatterer. Signals from the microwave source and from the receiving antenna are combined to yield an output signal having a magnitude which is a function of the magnitude of the field received by the scatterer and which is phase shifted proportional to the phase shift of the microwave signal from the transmitting antenna to the scatterer and thence to the receiving antenna. The output signal may be compared with a signal coherent with the frequency of rotation of the scatterer to determine the tilt angle of the electric or magnetic field received by the scatterer.
REFERENCES:
patent: 3300722 (1967-01-01), Keigo Iizuka
patent: 4051474 (1977-09-01), Mack
patent: 4053892 (1977-10-01), Earp
Short-Range Radio-Telemetry for Electronic Identification, Using Modulated RF Back Scatter, By Koelle, Proceedings of IEEE, Aug. 1975 pp. 1260-1261.
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Antenna Measurements--1978, By Kummer, Proc. IEEE, vol. 66(4), pp. 483-503, Apr. 1978.
Measurement of Aircraft-Antenna Patterns Using Models, G. Sinclair, Proceedings of the IRE, Dec. 1947 pp. 1451 to 1462.
A New Perturbation Method for measuring Microwave Fields in Free Space, Proc. IEE, vol. 102B, pp. 836-844, 1955.
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Direction Sensitive Doppler Device, Kalmus, Proc. IRE, vol. 43(6), pp. 698-700, Jun. 1955.
Chin Tommy P.
Safourek Benedict V.
Wisconsin Alumni Research Foundation
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