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Proceedings of 8th Asia-Pacific Conference on Antennas and Propagation (APCAP 2019)
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.
A formal method is proposed for constructing a macromodel of a linear equivalent electrical circuit of a communication satellite antenna. The macromodel can contain as many phase variables as the antenna designer wants. The macromodel maintains a simple dependence of its output characteristics on the design-technological variable parameters of the antenna model. The use of this approach allows reducing the complexity of calculations by several orders of magnitude
2019 International Siberian Conference on Control and Communications (SIBCON). Proceedings
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.
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.
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.
The author reviews the structure of a mobile radio facility system, presents an analysis of electromagnetic fields of the transmitter and of the contact disturbance source in vehicles, and provides a ratio for calculating the signal in the receiver antenna.
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.
This volume presents new results in the study and optimization of information transmission models in telecommunication networks using different approaches, mainly based on theiries of queueing systems and queueing networks .
The paper provides a number of proposed draft operational guidelines for technology measurement and includes a number of tentative technology definitions to be used for statistical purposes, principles for identification and classification of potentially growing technology areas, suggestions on the survey strategies and indicators. These are the key components of an internationally harmonized framework for collecting and interpreting technology data that would need to be further developed through a broader consultation process. A summary of definitions of technology already available in OECD manuals and the stocktaking results are provided in the Annex section.