Bandwidth substitution method and system for absolute measuremen

Details Bandwidth substitution method and system for absolute measuremen Bandwidth substitution method and system for absolute measuremen

1976-06-03

1978-08-01

Rolinec, Rudolph V.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With waveguide or long line

324 58A, G01R 2100

Patent

active

041045874

ABSTRACT:
A highly sensitive method and system for making absolute measurements of er at all radio frequencies is described. This method surmounts the primary shortcoming of the other existing methods in that it permits absolute measurement of power at all radio frequencies, whereas all other methods except one, viz, the so-called incremental method, (described in our co-pending application), are inherently frequency limited, with the current upper limit being about 75 GHz. This major advantage stems from the fact that this method utilizes a direct comparison of the unknown rf power with a primary standard, whereas the other methods (with the exception of the incremental method) require a conversion of the power to heat before making the comparison. The main advantage of this method over the incremental method is that it has much higher sensitivity, permitting absolute measurement of rf power to be made down to about -100 dBm, as compared with only about -10 dBm for the incremental method. An additional advantage of this method is that it permits the measurement of noise as well as coherent rf power, whereas the incremental method is valid only for the case of coherent rf.

REFERENCES:
patent: 2411553 (1946-11-01), Ramo
patent: 3034045 (1962-05-01), Wienschel
patent: 3349327 (1967-10-01), Long

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