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For instance, a diode, a thermocouple or an optical modulator, whose output voltage leads to an indicating device. As has been shown [1], with no regard to the type of detector applied, the probe may have certain maxima in its frequency response, especially at the highest frequencies. They result from the increase of the effective length of the antenna, resonance of the probe's parasitic reactance, alternations of the detector efficiency with frequency and others. Meanwhile, the frequency response of the probe should be maximally flat within the entire measuring band (medium frequency range) and it is assumed that outside the band the sensitivity of the probe should not exceed that within the band.

10) gives the error resulting from the phase changes along the antenna and dependent from kh. The formula makes it possible to find the ELECTRIC FIELD MEASUREMENT 51 magnitude of kh for which the value of the error will not exceed a permissible level. 2 as a function of kh. 2. Error d1E versus kh. 2 is about twice that defined by the ratio of the current intensity at the input of the antenna to that averaged along the antenna. In light of the above discussion, the use of antennas longer than h < l/4 seems to be unacceptable.

D. A. Tschernomordik, "Estimation of the Far-Field Boundary of a Symmetrical Dipole" (in Russian), Trudy NIIR, No. 4/1972, pp. 55-60. 2. C. C. Johnson, T. C. Rozzell, "Liquid Crystal Fiber Optic RF Probes, Part I," Microwave Journal, 1975, No. 8, pp. 55-57. 46 ELECTROMAGNETIC FIELD MEASUREMENTS IN THE NEAR FIELD 3. C. C. Johnson, A. W. Guy, "Nonionizing Electromagnetic Wave Effects in Biological Materials and Systems," Proc. IEEE, 1970, Vol. 60, pp. 692-718. 4. E. L. Larsen, R. A. Moore, J. , Vol.

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