Portable Meter for Measuring the Modulus of the Reflectivity of Various Material Objects Over a Broad High-Frequency Band

Resumo

A portable meter for measuring the modulus of the reflectivity of various material objects over a wide range of frequencies using a low-intensity noise probe signal is described. The operation of the meter is analyzed with the real characteristics of its high-frequency components and of the elements of the circuit taken into account. Formulas are obtained for estimating the deviation of the measured absolute values of the reflectivity from the ideal values. It is found that the main contribution to the difference in the deviations is from damping of the signal from the noise generator in the meter as the signal passes toward the antenna through the circuit elements. An adjustable attenuator for the generator signal is included in the meter to account for the damping. A way of reducing the systematic error is examined and the permissible values of the characteristics of the circuit components of the meter are determined.