Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1979-09-17
1983-01-11
Blum, Theodore M.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343100SA, H04B 700
Patent
active
043684696
ABSTRACT:
A method and apparatus for use in scientific measurement analysis and control. Travelling interference fringes are generated by radiating at least two different periodic waves at two different frequencies, one from each of two different radiators. The waves are received, mixed and filtered to detect at least one beat signal from these waves which represents the travelling interference fringe. The phase of that beat signal is detected relative to a reference signal of the same frequency as the beat signal. The radiated waves may be received at a second antenna and the phase of the beat of the waves at the first antenna is compared to the phase of the beat as observed at the second antenna. A third wave may be radiated from the first antenna to provide a reference signal which is the beat generated by the third wave and the other wave from the same radiator.
REFERENCES:
patent: 3346861 (1967-10-01), Chadwick et al.
patent: 3942177 (1976-03-01), Danzer et al.
patent: 4187506 (1980-02-01), Dickinson
patent: 4213131 (1980-07-01), Kaiser, Jr.
Ott James H.
Rice James S.
Blum Theodore M.
Foster Frank H.
Novar Electronics Corporation
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