Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1977-10-31
1979-07-17
Tubbesing, T. H.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 5NA, G01S 924
Patent
active
041617312
ABSTRACT:
An FM radar for the measurement of coal thickness wherein an FM transmitter is modulated by the combination of two signals, one, for example, being of a frequency of 100 Hz, and the other being of a frequency of 15 Hz. A horn-type antenna is used which is filled with a material having a dielectric constant approximating that of coal, the antenna being positioned flush against the coal.
REFERENCES:
patent: 3068471 (1962-12-01), Erst
Manning John R.
Porter George J.
The United States of America as represented by the Administrator
Tubbesing T. H.
Wofford, Jr. L. D.
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