In the work, a microwave balanced mixer based on transmission line combinations has been designed and investigated. Two developed layouts of balanced mixers on boards of different dielectric materials are investigated. The results of measuring the parameters of the mixers showed results that are better than those of mixers built according to traditional schemes on microstrip lines.

Keywords: balanced mixer, combination of transmission lines, hybrid device, electric circuit, ring bridge, quarter-wave open loop, conversion loss, dielectric, microstrip line, slot line

Considered are the issues of automatic direction-finders efficiency ensuring at the Central vibrator ARP failure, which proposes to change the switching order of the vibrators of radio direction finder antenna system. An algorithm for changing the switching order of the antenna system vibrators is presented.

Keywords: radio direction finder, antenna system malfunction, increase of radio direction finder reliability

Issues related to the features of multi-channel signal processing based on superresolution methods using a system with a quasi-ring arrangement of receivers are considered. The output characteristic is compared using the classical processing method (radiation pattern is formed) and the superresolution method (direction-finding relief is formed). As a basis of the signal processing algorithm, the property of 2π-periodicity of the angular dependence of the directivity characteristics of the receivers and the signal power is used. The issues of increasing the resolution in the angular direction of the received signals were studied during multichannel processing in a receiver system with a ring arrangement. The possibility of a significant improvement in resolution during the transition from the classical method to the method of superresolution is shown.

Keywords: multichannel processing, radiation patterns, Hamiltonian cycle, angular distribution, annular and quasi-ring antenna array, directivity characteristics, synthesis of amplitude-phase distribution

Microwave plants are now widely used in industrial and agricultural processes. The main effects by using of focusing of methods in procceses of microwave proccesing of grain cultures is considered. Cereals are dissipative materials with a significant attenuation factor. Focused excitation allows to concentrate field intensity distribution near focusing point in planes parallel and perpendicular to aperture. The limit depth of effective focusing is determined. The dependence of the focus efficiency and the size of the focused area on the depth of the focus point location is also shown.

Keywords: Microwave processing, focusing aperture, efficiency of focusing, size of area of focusing

The scheme and design of the detector operating in the range of operating frequencies from at least 1 to 1250 MHz are described. An experimental study of the frequency dependence of the voltage sensitivity B_u, as well as the amplitude characteristic at four frequencies. It is shown that the detector has a high frequency response uniformity and can be used in measuring and receiving-transmitting equipment.

Keywords: the entrance detector, the voltage sensitivity, the amplitude, the unevenness of sensitivity on the voltage

The possible ways of research and development of management of ultra-high-frequency technological complex for the treatment of solids and liquids accumulated in waste storage on horse and livestock farms. Given a classification assessment of existing and proposed integrated model thermoelectrochemical approaches that account for physico-chemical composition of the treated medium. The results of laboratory experiments on drying of processed substances for the justification of integrated management and development of real microwave technological complex are presented.

Keywords: dielectric, dielectric permittivity, microwave heating, humidity, waste, physicochemical composition, mathematical models, technological complex

A novel compact easy-to-manufacture design of 20 dB directional coupler has been proposed for a high power operation within frequency band 4-12 GHz. In order to obtain the broad band frequency response a three-section asymmetric coupled strip-line directional coupler has been chosen. The periodic structures are introduced on the outer edges of coupled strip-lines for the wide-band compensation of the difference between phase velocities of even and odd modes. The successfully fabricated and tested coupler shows high electrical performances. The proposed 20 dB directional coupler provides within frequency band 4-12 GHz the coupling characteristic imbalance 0.5 dB, isolation 35 dB, directivity 15 dB and VSWR<1.35. The allowable input power of directional coupler is up to 100 W. The coupler dimensions are 39x35x26 mm.

Keywords: directional coupler, coupled strip-lines, even and odd modes, periodic structures, phase velocity of modes, lines with side coupling

This article discusses various configurations of dielectric inhomogeneous waveguides in the microwave range, discusses the results of computer electrodynamic modeling of the proposed configurations of structures with periodic inhomogeneities. During the simulation, the geometric and electrophysical parameters of the periodic structure were varied in order to identify their influence on the characteristics of the proposed sensor to determine the properties of liquid dielectric media.

Keywords: dielectric waveguide, Bragg reflection, dielectric constant, reflection coefficient

A theoretical calculation of the transmission coefficient of the microwave converter on a resonant tunneling diode, where the same diode is used as a mixer and amplifier of microwave oscillations, is carried out. In this case, as shown by calculations, the transmission coefficient increases due to the use of regeneration, and also because the non-linearity of the current-voltage characteristic of a resonant tunneling diode is much larger than that of conventional microwave diodes with a Schottky barrier.

Keywords: transfer coefficient, regeneration, resonant tunnel diode (RTD), volt-ampere characteristic (VAC), input amplifier, equivalent mixer, intermediate frequency transfer coefficient, input amplifier transfer coefficient, dual-barrier heterostructure

As a solution eliminating the disadvantage of wired home theaters - the multiplicity of signal and feed wires - a method of wireless power transmission is proposed to charge the batteries of the side and rear speakers at a frequency of 2.45 GHz. The energy of the microwave radiation is converted into energy for charging the batteries by means of a special receiving module. The receiver module includes a receiving antenna, a rectifier and a power controller. This article discusses the calculation of the receiving antenna for this system in the structure of a wireless home theater. For the simulation, an antenna of the Yagi-Uda type was chosen, for which the gain and the beamwidth were determined. During the first stage of the simulation, antenna parameters were obtained that were unsatisfactory in the width of the directional pattern. At the second stage, the antenna design was modernized and a re-simulation was performed. Based on the results of this, it can be concluded that the parameters of the receiving antenna improved by 1.5 times, while the gain factor increased by 13%.

Keywords: wireless home theater, wireless microwave power transmission, receiving module, Yagi-Uda antenna, simplified Landtapo dipole, patch antenna, antenna efficiency indicator, radiation pattern, gain factor, reflection coefficient

In this article, we consider a method for implementing a conveyor method for processing substances using microwave radiation and the idea of using the principle of a focused aperture in the organization of adaptive control of processing processes. The results of calculations confirm the possibility of creating conveyors with the implementation of the function of microwave processing of transported materials.

Keywords: Microwave, broadband aperture, processing, focused aperture

The article discusses the relevance of the research of new coatings to control their properties. At the beginning of this article provides an overview of existing methods of creating frequency-selective surfaces. Further considered controlled by a frequency-selective surface. Also refers to the design created surfaces. At the end of the article is an analysis of the results on the study of controlled frequency-selective surfaces, comparisons with previous results.

Keywords: Control, frequency-selective surface, microwave, radio-absorbing material

The paper presents results of a study of operational recursive methods for quasiharmonic signals frequency estimating over a short observation interval. Such methods should be used, for example, for adaptive control of directional pattern of hydroacoustic antennas in inhomogeneous medium. We proposed recursive expressions for realizations of four methods of frequency estimation within the limits of sliding observation interval. The expressions require a minimum number of mathematical operations, which does not depend on the observation interval length. We carried out comparative analysis of the speed, accuracy, and stability of the methods. The stability of the methods was analyzed based on results of model signals processing with constant amplitude, frequency, and initial phase in presence of additive white normal noise. The accuracy was investigated by the processing results of signals with slow varying amplitude and phase. The paper also presents the results of processing of long sequences of modulated signals with additive noise within a sliding window with predetermined duration. The obtained results make it possible to select from among the four methods the optimal one according to one or more criteria.

Keywords: communication channel, directional pattern, frequency estimation, recursive method, accuracy of method, stability of method, sliding interval

An experimental investigation of two low-noise amplifiers is carried out. The first amplifier contains one cascade on the HMC374 chip, the second LNA contains two cascades on the same chip. Amplitude and amplitude-frequency characteristics of both amplifiers are obtained, a comparison with the passport characteristics is made. The amplifiers correspond to the passport data for all parameters, except saturation power at the upper boundary frequency.

Keywords: Low-noise amplifier, amplitude-frequency response, amplitude characteristic, saturation power

The simulation algorithm for the system of microwave electronic devices with the method of nonautonomous blocks is given in this article . The voltage-current characteristic of the wave nonlinear element, which is the basic element in the theory of the electronic wave chain, is calculated.

Keywords: microwave electronic device, electric circuit, wave non-linear element, four-terminal network, the current-voltage characteristic, method of nonautonomous blocks

To produce controlled radio frequency and microwave devices such as phased antenna arrays, delay lines, an affordable and inexpensive way of manufacturing varactors in large quantities should be found. One of the promising ways to produce such varactors is based on the use of a BST-paste with a low firing temperature, which allows it to be integrated into a substrate of low-temperature co-fired ceramics (LTCC).

Keywords: semiconductor, ferroelectric, BST-paste, ferroelectric condenser, LTCC technology

The characteristics of amplifiers on resonant-tunnel diodes (RTDs) are analyzed using the method of approximation to them and operating at frequencies close to resonant. It was revealed that the nonlinear and resonant properties of the amplifier on the RTD are related and determined from each other; the nonlinearity of the current-voltage characteristics of the RTD imparts a resonant curve to the form that usually occurs in the case of nonlinear reactivity. It is established that for large signals it is necessary to take into account the frequency dependence, which will complicate the course of the resonance curves. In this question, the most complete equivalent RTD scheme without simplifications.

Keywords: amplifier on resonant-tunnel diodes, equivalent circuit, amplitude-frequency characteristic, instability region, oscillatory characteristic, regeneration parameter

An experimental study of two instances of low-noise amplifiers of the range 1.5-2.0 GHz is carried out. The following results were obtained: the amplification gain varies from 24 to 37 dB in the frequency range; the maximum output power was not less than 10 mW (10 dBm); the compression point of 1 dB is achieved with an input power of minus 16 dBm. To illustrate the measurement results, two amplitude-frequency characteristics and an amplitude characteristic of the second specimen are given. The main element of the studied amplifier is a chip of the type MAAL-007304.

Keywords: Microwave power amplifier, decimeter waves, amplitude-frequency characteristic, experiment, microcircuit

A review of the serial microwave detectors of AEROFLEX company was conducted. Parameters of 116 detector models are considered. The features of AEROFLEX products are noted, including wide frequency range, high sensitivity, harsh operating conditions, a variety of design, including coaxial and strip type.

Keywords: detector, voltage sensitivity, tangential sensitivity, standing wave ratio, non-uniformity of the transfer characteristic, offset, overload protection

The article presents the results of simulation of the microstrip microwave structure of the ring configuration, which, by analogy with the fiber-optic prototype, embodies the principle of Fano resonance formation. This type of resonance is characterized by the asymmetry of the shape and has a narrower resonance than the classical Gaussian and Lorentzian forms.

Keywords: Ring resonator, Bragg reflection, Fano resonance, phase shift

In article the developed circuitry decision with high response characteristics of the multistage programmable attenuator very high frequency of power on the basis of low-sized microstrip elements and heterojunction GaAs HEMT of structures is considered. The main aspects of design and functioning of the diagram are described. Results of simulation mathematical modeling are given in a software package of Microwave Office.

Keywords: MMIC, low-sized microstrip structures, programmable attenuator, heterojunction, HEMT, GaAs, Microwave Office.

Way of implementing pipelined processing of substances using broadband focused aperture were considered in this article. The model of this installation was created and calculated in the software package CST Studio Suite.

Keywords: microwave, broadband aperture, processing, focused aperture

In article a modelling and experimental survey of the controlled attenuator in a frequency range 2 - 4 GHz is performed. It is received the minimum attenuation no more than 3.5 dB, the maximum attenuation not less than 56 dB at a current 3.8 mA. The amplitude-frequency characteristic unevenness at a current 3.8 mA does not exceed 3 dB. The attenuator design is made in the form of the hybrid module. The attenuator is intended for adjustment of transfer constant of the microwave receiver.

Keywords: attenuator, pin-diode, amplitude-frequency characteristic, control current

In the article a method for analyzing the characteristics of materials is considered, with the possibility of more accurate measurement by typical measuring instruments. Modled computer models of tees with different types of wave propagation are considered. Also talk about the design of the models created and an analysis of the results obtained on the study of the characteristics of materials, with the possibility of more accurate measurement by typical measuring instruments.

Keywords: Microwave, VHF wave, the centimeter wave range, waveguide tee, coaxial tee, resonance method

The article presents the results of increasing the sensitivity of the transformation elements on the basis of coaxial Bragg microwave structures, possible in two versions of the structure modification. In addition, an example of the configuration of the pressure control is given.

Keywords: coaxial waveguide, bragg structure, bragg reflection, pressure sensor, microwave sensor