scholarly journals Methodical approach to estimation of energy characteristics of antenna arrays of space communication means of decimeter wavelengths

2021 ◽  
pp. 32-39
Author(s):  
V. V. Zvonarev ◽  
S. V. Tereschenko ◽  
M. S. Brodskiy
Keyword(s):  
Antenna Arrays ◽  
Communication Systems ◽  
Satellite Communication ◽  
Development Stage ◽  
Phased Array Antenna ◽  
Space Communications ◽  
Operating Modes ◽  
Methodical Approach ◽  
Mass Size ◽  
Antenna Systems

The article describes a sequence of mathematical and logical operations for determining the energy and mass-dimensional characteristics of an active phased array antenna operating in the decimeter wavelength range of space communications necessary to ensure continuous operation for a given time. When designing large-size antenna systems, a preliminary assessment of the mass-size, energy and thermal parameters is required to assess the feasibility of the project. In this regard, the article uses a mathematical apparatus that includes a model and methods that allow determining the tactical and technical characteristics of satellite communication systems at the design or development stage. The novelty of the developed method consists in assessing the potential capabilities of spacecraft of satellite communication and retransmission systems, taking into account the energy and weight and size characteristics of their antenna systems and in determining the degree of implementation of the main modes of operation of Earth stations at the design or development stage for the specified operating modes of satellite communication systems.

MATHEMATICAL MODEL OF THE RADIATING APERTURE OF HEADLIGHTS CONSISTING OF SEGMENT-PARABOLIC ANTENNAS

2021 ◽  
pp. 69-78
Author(s):  
Ю.Г. Пастернак ◽  
В.А. Пендюрин ◽  
К.С. Сафонов
Keyword(s):  
Mathematical Model ◽  
Antenna Arrays ◽  
Communication Systems ◽  
High Speed ◽  
Satellite Communication ◽  
The Arctic ◽  
Northern Latitudes ◽  
Electronic Model ◽  
Mobile Satellite ◽  
High Orbit

Решение задачи связи в Арктике, а также в тундре, в тайге, в лесу, в море, на полях возможно только с использованием мобильных систем спутниковой связи. ФГУП «Космическая связь» (г. Москва) располагает группировкой спутников, которая постоянно расширяется. Для надежной связи в Арктике и в северных широтах, помимо геостационарных спутников, запущены спутники, движущиеся по высокоорбитальным траекториям. Для переключения со спутника на спутник, входящий в зону видимости абонента, необходимо использовать антенные решетки. Проблема заключается в том, что в настоящее время отсутствуют мобильные терминалы высокоскоростной спутниковой связи, а стоимость зарубежных аналогов препятствует широкому их использованию (достигает 50 тысяч долларов). Обычно радиолокационная связь (РЛС) с фазированной антенной решеткой используется для наблюдения за тысячами угловых точек, для отслеживания сотни целей. Такие требования могут быть выполнены только путем сканирования луча в пространстве в течение микросекунды. Ясно, что необходимо электронное управление лучом, поскольку механически вращать антенну не представляется возможным. Лишь некоторая часть вышеуказанных проблем будет затрагиваться в этой статье, ниже будут представлены электронная модель антенной решетки и её математическая модель The solution of the communication problem in the Arctic, as well as in the tundra, in the taiga, in the forest, in the sea, in the fields is possible only with the use of mobile satellite communication systems. FSUE "Space Communications" (Moscow) has a constantly expanding group of satellites. For reliable communication in the Arctic and Northern latitudes, in addition to geostationary satellites, satellites moving along high-orbit trajectories were launched. To switch from one satellite to the other included in the subscriber's visibility area, it is necessary to use antenna arrays. The problem is that currently there are no mobile terminals for high-speed satellite communication, and the cost of foreign analogues prevents their widespread use (up to 50 thousand dollars). Typically, a phased array radar is used to track thousands of corner points to track hundreds of targets. Such requirements can only be met by scanning the beam in space for a microsecond. It is clear, that electronic beam control is necessary since it is not possible to mechanically rotate the antenna. Only some of the above problems will be touched upon in this article. An electronic model of the antenna array and its mathematical model is presented

scholarly journals Design of Multilevel Sequential Rotation Feeding Networks Used for Circularly Polarized Microstrip Antenna Arrays

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Aixin Chen ◽  
Chuo Yang ◽  
Zhizhang Chen ◽  
Yanjun Zhang ◽  
Yingyi He
Keyword(s):  
Antenna Arrays ◽  
Microstrip Antenna ◽  
Communication Systems ◽  
Satellite Communication ◽  
Phased Array ◽  
Improve Performance ◽  
Multiple Series ◽  
Circularly Polarized ◽  
Microstrip Antenna Array ◽  
Feeding Techniques

Sequential rotation feeding networks can significantly improve performance of the circularly polarized microstrip antenna array. In this paper, single, double, and multiple series-parallel sequential rotation feeding networks are examined. Compared with conventional parallel feeding structures, these multilevel feeding techniques present reduction of loss, increase of bandwidth, and improvement of radiation pattern and polarization purity. By using corner-truncated square patch as the array element and adopting appropriate level of sequential rotation series-parallel feeding structures as feeding networks, microstrip arrays can generate excellent circular polarization (CP) over a relatively wide frequency band. They can find wide applications in phased array radar and satellite communication systems.

Ka-band antenna arrays with dual-frequency and dual-polarized patch elements

2016 ◽  
Vol 8 (6) ◽  
pp. 963-972 ◽  
Author(s):  
Benjamin Rohrdantz ◽  
Thomas Jaschke ◽  
Frauke K. H. Gellersen ◽  
Anton Sieganschin ◽  
Arne F. Jacob
Keyword(s):  
Antenna Arrays ◽  
Patch Antenna ◽  
Communication Systems ◽  
Satellite Communication ◽  
Circuit Board ◽  
Dual Band ◽  
Antenna Element ◽  
Dual Frequency ◽  
Ka Band ◽  
Dual Polarized

In this contribution a dual-band, dual-polarized microstrip antenna element for array applications is presented. The patch antenna is designed to operate simultaneously at around 30 and 20 GHz, the up- and downlink frequencies of modern Ka-band satellite communication systems. The antenna is smaller than half the freespace wavelength at 30 GHz to enable its utilization as array element of dual-band ground terminals. Integrating transmitter and receiver circuits allows, in turn, for a very compact active terminal solution. To minimize production cost, the design is carried out in standard multilayer printed circuit board technology. The antenna features two distinct polarization ports suitable for either dual linear or dual circular polarization if both ports are excited in quadrature. The single antenna design process is described in detail and simulation and measurement results are presented. Finally, different arrays based on this patch antenna are evaluated by simulation and measurements.

scholarly journals Features of the Use of Phase-Manipulated Pseudo-Random Signals without On-Board Processing in Satellite Communication Systems with a Nonlinear Repeater

2021 ◽  
Vol 24 (3) ◽  
pp. 46-52
Author(s):  
A.N. Mursaev ◽  
S.V. Zinkin
Keyword(s):  
Communication Systems ◽  
Satellite Communication ◽  
Directional Pattern ◽  
Adaptive Antenna ◽  
Communication Line ◽  
Energy Potential ◽  
Joint Application ◽  
Random Signals ◽  
Communication Lines ◽  
Antenna Systems

The features of the use of phase-manipulated pseudo-random signals without on-board processing in satellite communication systems with a nonlinear repeater are analyzed. In particular, the process of passing signals through a nonlinear repeater is considered, taking into account the resulting combinational interference. In more detail, attention is paid to one of the ways of noise protection of satellite communication lines - the use of spatial signal processing and interference in antenna systems. Depending on the type and number of subscribers served by antenna systems, the implementation of the above method is possible by using spatial selection of signals and interference, based on the use of antennas with narrow directional patterns; spatial interference rejection, based on the use of adaptive antenna systems that form dips in the directional pattern in the direction of interference sources; suppression of narrow-band interference in the notch frequency filter and the joint application of all these methods of interference suppression. The placement of multipath antennas on board a repeater satellite, in addition to increasing the noise immunity of satellite communication lines, provides: an increase in the energy potential of the satellite communication line; multiple frequency reuse; multi-station access with time separation and switching of beams on board; the formation of a given service area from a system of independent partial beams with intersecting narrow radiation patterns; the protection of satellite communication lines due to the localization of electromagnetic radiation in a narrow solid angle. The use of multipath antennas with a large number of independently controlled beams on board the repeater satellite significantly complicates the repeater and worsens its weight and size characteristics. For this reason, existing satellite communication systems use multipath antennas, which, as a rule, have no more than 7...10 beams with independent control.

scholarly journals EVALUATION OF THE FEASIBILITY OF AN ACTIVE PHASED ARRAY ANTENNA IN THE TERMINAL OF THE EXPRESS-RV SATELLITE COMMUNICATION SYSTEM

T-Comm ◽  
2021 ◽  
Vol 15 (8) ◽  
pp. 13-21
Author(s):  
Victor S. Aleshin ◽  
Keyword(s):  
Communication System ◽  
Satellite Communication ◽  
Phased Array ◽  
Array Antenna ◽  
Phased Array Antenna ◽  
Scanning Angle ◽  
Phased Array Antennas ◽  
Array Antennas ◽  
Mobile Satellite ◽  
Antenna Systems

The basic principles of building a promising domestic regional satellite communication system “Express-RV”, based on the highly elliptical orbit “Molniya” and intended for broadband access of civil sector subscribers to various public communication networks, in particular to the Internet, are considered. The main technical requirements for the antenna systems of mobile mobile satellite communication terminals of the Express-RV system are formulated. The necessity of using active phased array antennas for a number of types of such terminals is justified. A brief overview of the principles of implementation and examples of the design of microstrip active phased array antennas, including their elementary emitters and individual modules, are given. The problem of the occurrence of the blinding effect inherent in flat microstrip gratings made on dielectric substrates is noted; measures to compen-sate for this effect are considered. The possibility of expanding the maximum scanning angle of a narrowly directed beam of an active phased array antenna by using a magnetically controlled scattering dielectric lens, as well as creating segment-dome structures of antenna systems in relation to mobile terminals of mobile satellite communications of the “Express-RV” system, is shown. Simple analytical relations are derived that allow us to estimate the number of elementary emitters required for the implementation of a receiving-transmitting active phased array antenna with specified technical characteristics: gain and maximum scanning angle; the corresponding dependencies are given. The cost of creating an antenna system based on an active phased array is estimated.

scholarly journals ANTENNAS OF MOBILE TERMINALS IN MODERN MOBILE COMMUNICATION NETWORKS (OVERVIEW)

2019 ◽  
Author(s):  
Valentin Popov ◽  
Vladimir Skudnov ◽  
Alexey Vasilyev
Keyword(s):  
Mobile Communication ◽  
Antenna Arrays ◽  
Communication Systems ◽  
Mobile Station ◽  
Line Of Sight ◽  
Adaptive Antenna ◽  
Mobile Terminals ◽  
Mobile Communication Systems ◽  
Mobile Stations ◽  
Antenna Systems

In connection with the development of technology of mobile terminals (cell phones, smartphones, tablets, computers with wireless modems, etc.) in the standards of UMTS (3G) and LTE (4G) great attention of manufacturers of these devices is concentrating on the modernization and development of antenna systems of mobile stations (terminals). Currently, antenna systems of mobile stations is implementing on base of technology in form of complex configuration microstrip transmission lines, which ensure compliance with the requirements of modern wireless communication standards. Adaptive antenna arrays and MIMO antenna systems are implemented in mobile terminals for road and railway transport, which allow to achieve a sustainable reception of signals from the base stations. As you know, the difficult conditions for the propagation of radio waves in cellular mobile communication systems are associated with their absorption, multiple reflection and scattering. In these cases, the laws that are true for the line of sight conditions (LOS, Line of Sight) no longer work. The properties of antennas integrated into mobile terminals (mobile stations - MS (Mobile Station)) directly depend on the statistical characteristics of the environment and the location of the operating terminal relative to the spatial position of the user. Therefore, when designing MS antennas in UMTS and LTE mobile communication systems in the frequency ranges from 450 to 3700 MHz, it is important to consider all of the above factors.

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