V. I. Kalinin

Synchronization and combining of the radiation powers of active microwave antennas integrated with field-effect transistors

Combining of the powers of microwave generators designed as a array of log-periodic antennas on a dielectric substrate and field-effect transistors as active components is experimentally investigated. Possibilities of a substantial increase in the generation efficiency due to mutual synchronization of radiators are demonstrated, and conditions for formation of the radiation pattern are studied.

Generation of microwave oscillations in a log-periodic antenna integrated with a field-effect transistor

Generation of microwave oscillations in a hybrid integrated circuit comprising a field-effect transistor and a log-periodic microstrip antenna on a dielectric substrate is experimentally investigated. Generation is observed at both the fundamental harmonic and higher frequencies corresponding to the antenna resonances in the frequency band 6–60 GHz. Possibilities of optimizing the generator design are studied in application to operation in centimeter and millimeter wave bands.

Generation of microwave radiation by active antennas with field-effect transistors in a quasi-optical resonator

Effects of locking of generator antennas (GAs) with field-effect transistors by the electromagnetic field formed as a result of reflection of radiation from a semitransparent dielectric mirror are analyzed. The possibility of spatial combining of the radiation powers of the GAs placed on a common dielectric substrate and forming a linear or a 2D matrix is demonstrated. It is shown that application of a reflecting mirror can substantially expand the GA mutual locking band and abandon external locking for power combining in the 2D matrix.

Generation of microwave radiation by active antennas with field-effect transistors locked by an external signal

Effects of locking by an external electromagnetic field of an array of oscillator antennas (OAs) designed by field-effect transistors integrated with log-periodic antennas are analyzed. The possibility of spatial combining of the radiation powers of OAs placed on a common dielectric substrate and arranged into a 1D array is demonstrated. It is shown that application of external locking can ensure severalfold broadening of the locking band of an ensemble of independent self-oscillators as compared to the case of mutual locking by a common field propagating in the dielectric substrate.

Active log-periodic antennas for spatial and quasi-optical microwave power combining

Power combining in the array of microwave oscillators, consisted of log-periodical antennas with field-effect transistors as active elements, is experimentally studied. The opportunity for considerable improvement of oscillation efficiency due to the mutual synchronization is shown and conditions of formation of the radiation pattern are defined.

Orthogonal Chaotic Coding in MIMO Telecommunication System

Orthogonal chaotic code sets are designed for wireless telecommunication system with wideband multiple access on the basis of MIMO technology. It is shown that orthogonal chaotic code application provides low interference between channel waveforms, in order to increase information capacity, and to guard the information transmitted

Wideband digital communication system with spectral processing of noise waveforms

We propose a digital communication system on the basis of double spectral processing of ultra wideband (UWB) noise waveforms. The structure of the spectral modulator of UWB noise waveforms is presented for digital information transmission. The spectral modulator performs the code transformation of the UWB noise spectrum by means of simple delay lines. The basis of UWB noise waveforms having periodic spectral modulation is defined as the product of the frequency bandwidth and the duration of a binary information symbol. The spectral compression of UWB noise waveforms with an information rate is discussed. It is shown that digital communication systems with double spectral processing of UWB noise waveforms have a high immunity against electromagnetic interference. The excellent electromagnetic compatibility (EMC) and low probability of intercept (LPI) performance characterize the proposed digital communication system. This work has been carried out with partial support by the Russian Foundation for Basic Research.

Data transmission on the basis of noise signals with spectral modulation

The paper presents a theoretical study of transmission and reception of discrete messages on the basis of spectral modulation of noise signals in an ultrawideband communication channel with an additive Gaussian white noise. Block diagrams of the spectral modulation of a noise signal in the transmitter, double spectral processing in the receiver, and separation of informative symbols in the demodulator are presented. Theoretical analysis of the bit error probability as a function of the signal-to-noise ratio per bit in the communication channel and the bandwidth—duration product of the carrier noise signal is performed.

Microwave oscillations in log-periodic antenna integrated with a field-effect transistor

Microwave oscillations in the hybrid integrated circuit consisted of field-effect transistor and microstrip log-periodical antenna is experimentally studied. The oscillations were observed both at the basic resonant frequency of the antenna and at the harmonics from 6 GHz to 60 GHz. The opportunities for set-up optimization were studied in application to millimeter wave frequency region.

Spectrum-Modulated Wireless Ultra Wideband Noise Communication System

This paper proposes the possibility of using UWB noise continuous waveforms for the reliable digital data transmission with high data rate and high interference immunity. Wireless noise communication system proposed operates over 3.1-4.1 GHz frequency band. Low spectral density of the transmitted noise power, high immunity against electromagnetic interference (EMI), and excellent EMC and LPI performance characterize the proposed wireless communication with double spectral processing of UWB noise continuous waveforms.