Methods for extension of the rejection band of microwave devices on the basis of planar modified mushroom-shaped metamaterial structures
Methods for extension of the rejection band of microwave devices on the basis of planar modified mushroom-shaped metamaterials comprising either two-layered topological structures with frequency-selective surfaces or multilayer bulk structures with intermediate layers containing split-ring resonators are proposed. Computer simulation of such devices, clearly demonstrating a twoto six-fold extension of the rejection band is performed. Experimental results confirming the results of numerical simulation are presented.
The investigation of microwave sensor on the planar mushroom-shaped metamaterial is considered. The results of numerical simulation microwave sensor for measurement of physical quantities and monitoring parameters of technological processes using CST Studio Suite are presented. Also it is shown that the microstrip sensor has geometrical dimensions much smaller operating wavelength while maintaining a high Q-factor structure.
In article methods of increase of accuracy of measure calculations of non-failure operation and durability of microwave devices which are widely applied both in household appliances, and in modern devices and systems of space engineering are considered. It is obvious that operability of such microwave devices is extremely important as their refusal conducts to failure of the radioelectronic equipment (REA) as a whole. Feature of microwave devices is that a large number of constructive (mechanical) components is their part. However, in case of an assessment of indicators of reliability of REA consider only electronic component base, accepting all constructive (mechanical) components highly reliable, almost not influencing sizes of indicators of nonfailure operation, durability and a keeping. In confutation of it in article the example of measure calculation of reliability of the microwave switchboard is given and need of accounting of mechanical components and temporary working schedules is proved.
The scientific paper is dedicated to the investigation of a rectangular waveguide R32 type with magnetic wall of mushroom-shaped metamaterial supplemented by a dielectric substrate. The computer model of the waveguide filter under consideration and its quantitative characteristics of S-parameters and voltage standing wave ratio received are presented. All collected data are appropriately organized in terms of convenience to compare the figures and submitted as the frequency dependence plots which are more representative and straightforward for analysis. Based on the results obtained it is possible to make assumptions about the qualitative transformation of waveguide properties under the influence of a mushroom-shaped metamaterial and prospects for a future integration this construction in the microwave devices. This groundbreaking treatment could be an underlying solution to the problem of miniaturization and performance in the modern technology development.The scientific paper is dedicated to the investigation of a rectangular waveguide R32 type with magnetic wall of mushroom-shaped metamaterial supplemented by a dielectric substrate. The computer model of the waveguide filter under consideration and its quantitative characteristics of S-parameters and voltage standing wave ratio received are presented. All collected data are appropriately organized in terms of convenience to compare the figures and submitted as the frequency dependence plots which are more representative and straightforward for analysis. Based on the results obtained it is possible to make assumptions about the qualitative transformation of waveguide properties under the influence of a mushroom-shaped metamaterial and prospects for a future integration this construction in the microwave devices. This groundbreaking treatment could be an underlying solution to the problem of miniaturization and performance in the modern technology development.
The Asia-Pacific Conference on Antennas and Propagation (APCAP) is an international forum for the exchange of information on the progress and recent advancements in the research and development of innovative antenna technology and radio wave propagation. APCAP has been successfully inaugurated in Singapore in 2012 and held in Chiangmai in 2013, Harbin in 2014, Bali Island in 2015, Kaohsiung in 2016, and Xi’an in 2017 and Auckland in 2018. It will be held in Korea for the first time. APCAP 2019 will offer a rich scientific program of the highest quality with the keynote and invited speakers from all over the world and provide a broad forum of exchange for both academia and industry alike, with the aim of fostering the collaboration between them. The conference will cover a wide range of topics related to antenna technology, wave propagation, and electromagnetic theory. Prospective authors are invited to submit original contributions on their latest research findings and technology applications.
Electronic equipment of spacecraft is exposed to ionizing radiation of outer space, which is another reason for failure. Currently accepted to evaluate separately the reliability of electronic equipment and its radiation resistance, despite the fact that these phenomena are interrelated. The aim of the article is to estimate effects of ionizing radiation on the reliability of microwave devices, namely, the probability of failure-free operation of a microwave amplifier.
The probability of device failure model Q(t) for active lifetime is constructed as a product of the probabilities of failure Q1(t) - the probability of device failure due to set the total ionizing dose, Q2(t) - probability of failure of the device in the absence of exposure to ionizing radiation, Q3(t) - the probability of a single effect event. Probabilities Q2(t) and Q3(t) are valued at current normative documents. Probability Q1(t) is calculated based on probabilistic and physical models.
Research shows that, despite the high radiation resistance of microwave devices used in electronic equipment of spacecraft, when the long lifetime is required the low intensity radiation will have a tangible impact on the probability of failure. And that should be considered when designing equipment.
Microwave devices designed on the basis of multipole lenses (ring electromagnetic structures using resonant sections of slow-wave structures) are analyzed. The possibility of development on the basis of these lenses of a low-noise amplifier and a microwave multiplier, which ensure long-term interaction of the electron beam and the transversely extended electromagnetic field with continuous extraction of energy, is shown.
Waveguide termination modeling with a mushroom-shaped wall were carried out. Voltage standingwave ratio (VSWR) and reflection coefficient (S11) frequency dependencies were obtained. High values of the mushroomshaped structure unloaded quality factor are the main advantage of explored design. The using of distributed LC resonant circuit with dimensions which significantly smaller than wavelength allows creating a compact termination working in microwave range.
2019 International Siberian Conference on Control and Communications (SIBCON). Proceedings
Generalized error-locating codes are discussed. An algorithm for calculation of the upper bound of the probability of erroneous decoding for known code parameters and the input error probability is given. Based on this algorithm, an algorithm for selection of the code parameters for a specified design and input and output error probabilities is constructed. The lower bound of the probability of erroneous decoding is given. Examples of the dependence of the probability of erroneous decoding on the input error probability are given and the behavior of the obtained curves is explained.
The dynamics of a two-component Davydov-Scott (DS) soliton with a small mismatch of the initial location or velocity of the high-frequency (HF) component was investigated within the framework of the Zakharov-type system of two coupled equations for the HF and low-frequency (LF) fields. In this system, the HF field is described by the linear Schrödinger equation with the potential generated by the LF component varying in time and space. The LF component in this system is described by the Korteweg-de Vries equation with a term of quadratic influence of the HF field on the LF field. The frequency of the DS soliton`s component oscillation was found analytically using the balance equation. The perturbed DS soliton was shown to be stable. The analytical results were confirmed by numerical simulations.
Radiation conditions are described for various space regions, radiation-induced effects in spacecraft materials and equipment components are considered and information on theoretical, computational, and experimental methods for studying radiation effects are presented. The peculiarities of radiation effects on nanostructures and some problems related to modeling and radiation testing of such structures are considered.