• Problem Statement
• Pear-Shape Antenna
• Experiment
• SAR
• Software
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We present Software Package, corresponding numerical and experimental results dealing with EMC/SAR problems in wireless communication systems. The goal is to study the distributed system – radiating antenna together with the handset and interaction of this device with the users hand and head in order to minimize the SAR. When the wavelength of the radiated field is comparable with the dimensions of objects in the vicinity, these objects will affect all electrodynamic characteristics of the antenna. In order to accurately determine the radiation efficiency and directivity of an antenna, one must consider all geometric objects within the vicinity of the antenna, including the user’s hand, head and the handset itself. In order to achieve the best radiation characteristics of the antenna and have the minimum of the SAR we can get definitive results after solution of this complex, distributed electrodynamics problem.
The problem is to create a efficient and safe antenna structure for use in Personal Communication Facilities both in portable handsets and base stations. We considered a pear shaped metallic antenna covered with a thin dielectric layer. It’s very important to choice a good parameters of antenna for well matching with free space and feeding cable. The MAS based software package has been created to perform the numerical simulations of the above described complex system. The handy interface was developed to simplify the changes of the antenna’s geometry and its material properties.
Also the experimental prototype of the antenna has been developed and the comparative measurements have been conducted.

• Problem Statement
• Numerical Results
• Software
• To obtain the demo version, please, contact us
  

Sensitive electronic components and subsystems – such as microprocessor boards, etc. are essential parts of modern civilian and military systems like the cars, airplanes, communication, traffic management and safety systems. A failure in these systems could cause a major accident or economic disaster. Therefore the susceptibility of modern electronic systems to multiple-frequency EM fields is of great interest. Of particular interest is the development of a modeling methodology that leads itself to very efficient computer algorithm implementation. The reason for this is that the geometric complexity of system-level EMI/EMC problems is such that the discrete approximations of the associated electromagnetic boundary problems result in matrix problems of very large dimensions that challenge the computational resources of most state-of-the-art engineering design computer workstations. Our objective is to demonstrate the efficiency of the MAS to the 3-D EMC problems. We apply this formalism to the EMC problem for the vehicles with some lossy dielectric body simulating the driver inside it. The source of the electromagnetic wave, which produced initial, incident field, may be some inner antenna, electronic devices or some outer electromagnetic source. The MAS application makes it possible to easily calculate induced currents on the inner and outer surfaces of the cavities with apertures such as windows. The enhanced electromagnetic field at resonance frequencies inside the vehicle model creates an undesirable influence on the passengers’ health as well as on the sensitive electronic systems inside the vehicle.

• Crystals as Dividers
• Crystals as Filters & Mixers
• Crystals as Antennas
• Software
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The variety of microwave devices such as mixers, filters and splitters can be effectively created using a photonic crystal as a core element. Devices like mixers, separators, frequency filters, splitters etc. are widely used in the superhigh frequency band The growth of operating frequency much more complicates the preparation of such devices. At the sub-millimeter and optical frequencies the special type devices, referred to as photonic devices, become extremely efficient. The main part of such device is a dielectric crystal with appropriately arranged defects. Due to the nature of photonic crystals there are gaps in their spectrum that cause some frequencies to be filtered out – and some – to pass through. The ordinary absorbing medium transforms the power of electromagnetic wave to heat. However, the band-gap does not dissipate energy – but rather in this case the energy is accumulated and can be supplied to some desirable direction. The distribution of defects in the crystal defines its behavior with respect to the penetrating wave. Correspondingly, the crystal can split, mix, or filter the incident wave. So, in this way one can construct the several “canal” to the crystal. Namely, having different resonant capabilities the channels will exarticulate the carriers of different frequencies from the incoming signal. In general an experimental investigation of such the structures is sufficiently expensive, time consuming and in some cases is impossible at all. The main reasons for this are some of the system’s properties that can’t be changed continuously on-the-fly, and technical limitations for defect’s positions to be chosen arbitrarily. We have developed the program package for a numerical simulation of the wave propagation in FPC structures. The created software is intended to real-time FPC analysis and development for the device performance optimization. Some numerical results are presented below.

• Application of MAS in Field Reconstruction
• Experimental Measurements
• Latent Body Visualization 
• Immersed Body Problem
• Experimental Setup
• Software
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The contact less determination of the shape and position of a latent body has the numerous applications in different branches of science and technology. It may be used in Applied Electrodynamics, in Tomography, in Medicine for investigation of the internal organs, in Archeology for the study of fragile archeological samples, in Military Engineering for detection of explosive substances etc. Sometimes such method is an only possible way to investigate the body when a direct contact to the body is undesirable, dangerous, or impossible at all. In this topic we present the algorithm and software package for the shape and position of a latent body reconstruction using the recovered electromagnetic or acoustic scattered fields. The holographic approach to the reconstruction of scattered field based on the MAS. These articles mainly deal with the visualization of the scattered field singularities. Some experimental measurements have proved the validity of the proposed approach. The visualization of the body embedded within a dielectric media may be achieved whenever the dielectric media is transparent for particular frequency of the incident wave. The whole determination of the shape of a latent body requires this body to be illuminated from different sides with the different frequencies waves. The resolution of the recovered illuminated part is closely related to the number of incident frequencies.