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This interference becomes a problem only when the two telephones are very close. A few years ago, there was no need to consider such interference, because the number of telephones was small. However, with the increase in the number of telephones in use, this possibility cannot be ignored. Furthermore, the problem will become more serious in the future. The receiving-band noise that the transmitter generates is a typical example of this interference. The noise generated in the upconverter or modulator is amplified by a power amplifier.

ANTENNA INTERFERENCE AS A RESULT OF THE HUMAN BODY CAUSING DEGRADATION OF SENSITIVITY The radiation power from the antenna is absorbed by the human body resistively and/or reactively. The power absorbed resistively becomes an ohmic loss or heat production, which will be explained in the next section. The power absorbed reactively influences the directivity pattern and the antenna impedance. It leads to degradation of the antenna performance. The directivity and the impedance in actual use are different from those designed with a free-space assumption.

Middleton, Procedures for determining the parameters of the first-order canonical models of class a and class b electromagnetic interference, IEEE Trans. Electromagn. , EMC-21: 190–208, 1979. 12. D. Middleton, First-order non-gaussian class c interference models and their associated threshold detection algorithms, Tech. Rep. NTIA Contractor Rep. 87-39, Natl. Telecommun. Inf. Administration, 1987. 13. N. , Noise and Stochastic Processes, New York: Dover, 1954. 14. N. L. Johnson, S. Kotz, and A. W.

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