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The effect of intermodulation at the output transmitting adaptive antenna array

Keywords:

D.D. Ganzii – Dr. Sc. (Eng.), Head of Department, Scientific-Research Center «VIGSTAR» (Moscow) E-mail: ntc4@vigstar.ru P.V. Rusakov – Head of Sector, GSKB Almaz-Antey (Moscow) E-mail: rp258rt@rambler.ru G.I. Troshin – Dr. Sc. (Eng.), Professor, Leading Research Scientist, Scientific-Research Center «VIGSTAR» (Moscow) E-mail: ntc4@vigstar.ru


The occurrence of intermodulation products resulting from the impact of the fundamental frequency of the signal and the interference signal is considered to be inherent in the input circuits of receivers. However, it should be noted that this phenomenon also occurs in the non-linear elements of the transmitter output stage under the influence of the interference signal with sufficient power to cause the formation of intermodulation products. The influence of noise on the output signal transmission cascade in the case of adaptive transmit antenna array is most likely a side-lobes, covering a very broad spatial angle. In considered intermodulation components at the output of the active trans- guide array, where the nonlinear element is taken partial bipolar transistor power amplifier, as used on the most practical embodiment of the nonlinear element of the output stages of the transmitter in the centimeter wavelength range. The study of the total impact of the signal and noise in the output stages with non-linear transmission elements made it possible to determine the dependence of the first and second third-order intermodulation product, which are the most dangerous intermodulation products, the signal strength and interference. It is interesting result of the research, which consists in the fact that by increasing the capacity of the two tone signal at 10 dB, output third-order intermodulation product is increased by 30 dB, exemplifying the experimental data.
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