D. I. Voskresenskiy - Dr.Sc. (Eng.), Professor, Head of Department of Radiophysics, Antennas and Microwave Technique of Moscow Aviation Institute (National Research University)
E. V. Ovchinnikova - Ph.D. (Eng.), Associate Professor, Department of Radiophysics, Antennas and Microwave Technique of Moscow Aviation Institute (National Research University)
Bui Cao Ninh - Post-graduate Student, Department of Radiophysics, Antennas and Microwave Technique of Moscow Aviation Institute (National Research University). E-mail: buicaoninh@gmail.com
S. G. Kondratieva - Post-graduate Student, Department of Radiophysics, Antennas and Microwave Technique of Moscow Aviation Institute (National Research University)

At the present stage of development of telecommunication systems the necessity of expansion of their functionalities arises. Appearance of new possibilities of mobile communication systems dictates new requirements for characteristics of mobile phones antennas. The main requirement is an expansion of operating band or ability to work in several frequency bands. The application of broadband or multiband antennas provides mobile broadband internet access, video transmission and high bandwidth. The perspective direction in creating mobile phones antennas is designing compact antennas, operating in different combinations of frequency bands of cellular standards. Currently, many telecommunication companies use WiMAX standard to provide high-speed communication services. Therefore, the necessity of creating microstrip antennas arises, operating in two frequency bands of GSM 1900 and WiMAX (2,5-2,69 GHz) standards. Feature of modeling of mobile phones antenna is determination of the influence of translucent case and the user to the antenna directional characteristic. Therefore it is advisable to carry out modeling with specialized programs, destined for calculation of antennas and microwave devices. Modern programs allow to carry out modeling of the antenna in the case in the presence of objects nearby a mobile phone antenna. Modern mobile phones also have a defensive layer for the user, made from radio-absorbing material. Currently, application packages for system modeling and analysis of mobile phones antennas such as HFSS, Microwave Office, Microwave studio, etc., realizing by means of numerical electromagnetic methods, such as finite elements and finite differences, are used. The article describes the features of modeling microstrip antennas of mobile phones. Electrodynamic models of antennas, operating in one and two bands, are presented. Variants of constructions, providing safe operation of the user, are offered. Electrodynamic simulation results are presented in the form of frequency characteristics of antenna and directional characteristics. Dependency of VSWR on frequency shows the possibility of a dual-band antenna realization. On basis of the presented directional characteristics it can be shown that they weakly depend on frequency.

 

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