Abstract. Microwave solid-state
oscillators of noise-like signals are of the great interest for wireless
telecommunication systems, imaging systems and
electronic warfare. For instance, there is a method of direct-chaotic
information transfer (transmission by chaotic pulses) in the ultra-wideband
wireless personal communication standards. In this paper, the possibility of microwave
noise-like signal generation is investigated. A microstrip log-periodic antenna
integrated with a field-effect transistor (antenna-oscillator - AO) is used. In
the oscillator construction, one antenna petal is excited, and the positive
feedback is realized by means of the microwave electromagnetic field induction
in another petal. As an active element, NE3514S02 field-effect transistor with 13.5
dB gain at 12 GHz was chosen. The conditions of the chaotic oscillation emergence
are determined experimentally. It is found that the main factor resulting in broadening
of the signal frequency band is the distance between the plane of the antenna
and the reflecting screen (thickness of the substrate) and the value of the
current in the drain-source circuit of the transistor. Chaotic oscillations in the
antenna-oscillator with substrate thickness ranged from 0.015λ to 0.025λ (λ is
the wavelength in the dielectric) and drain-source circuit current located in
the saturation region of the current-voltage characteristic is experimentally
studied. The chaotic signal with a bandwidth up to 3 GHz in the frequency range
from 6 to 20 GHz is obtained.
Keywords:
microwave, self-oscillator, chaos, log-periodic antenna, field-effect
transistor.
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For citation:
E. O. Yunevich ,
V. I. Kalinin , V. D. Kotov , V. E. Lyubchenko , S. V. Marichek , D. E. Radchenko
, S. A. Telegin. Noise-like
signal oscillations in microstrip active antennas integrated with a FET
transistor.
Zhurnal Radioelektroniki - Journal of Radio Electronics,
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(In Russian)