A theory of waveguide behavior near cutminus;off as applied to the measurement of refractivity is developed. It is shown that the cutminus;off condition provides a means by which small changes lsqb;0(10minus;6)rsqb; in refractivity can be accurately measured. The general operating characteristics of a laboratory instrument operating at microwave frequencies (Xminus;band) and designed for the measurement of atmospheric refractivity is presented.
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