Tech Area / Field
- PHY-RAW/Radiofrequency Waves/Physics
3 Approved without Funding
NIIIT (Pulse Techniques), Russia, Moscow
- Institute of Strategic Stability, Russia, Moscow
- Boston University / Center for Space Physics, USA, MA, Boston
Project summaryLately there has shown up a trend toward an integration of radiotechnical systems and extension of the tasks, solved by them. That demands new engineering solutions, aimed at reducing dimensions, mass and cost of functional units. Particularly, one of such solutions consists in an essential reduction of radiator dimensions down to those approaching the ultimate values, defined by the fundamentals of antenna theory at retaining their basic electro-dynamic characteristics (the Ch-Harrington criterion). Such radiators (antennas) are commonly called subminiature ones. That demands a development of a new class of wide-band antennas, including ones, implemented in a plane version. The proposed by the Project authors loop antennas with triangle-shaped loops belong to the indicated class.
Up to present moment it has been acknowledged for the class of plane antennas, that the ones, implemented on the basis of auto-complementation have the least dimensions. Preliminary studies, conducted by the Project authors, proved, that the dimensions of the antennas proposed can be substantially less.
The antennas of the given type can be used as compact automobile antennas, bonded, for instance, directly to the automobile’s windows, and as the so-called “secret” antennas, placed, for instance, on the wall of a suitcase, papercase and so on, or sewn in overclothes (coats, cloaks, etc.). They also can be used as small-dimension sensors of electromagnetic radiation in a wide frequency band, what allows to analyze efficiently the “electromagnetic ecology”.
The discussed antennas can be implemented in a three-dimensional version, that allows, for example, to irradiate and pick up radiowaves with circular polarization.
When using such radiators in the meter and decameter wavebands, they can be implemented as fast-rolling-out structures, which in a rolled up state occupy a rather small volume and can be easy transported. That is of great importance for application in various extreme situations.
The study of the given class of antennas can be carried out only on the basis of a rigorous electrodynamic approach, providing the possibility of optimizing antenna parameters without any use of approximate physical suppositions, which often lead to essential errors at analyzing the new type structures.
The matters of analyzing and optimizing the electromagnetic parameters of antenna systems are considered in a voluminous literature. However, the majority of the used techniques either impose essential limitations on the problem (both on the antenna geometry and the volume, where the radiation fields can be determined), or demand substantial expenditures of computer time for ensuring the convergence of computation process. Thus, the matters of creating efficient techniques for analyzing the characteristics of antenna irradiation, based on a rigorous statement of the corresponding electrodynamic problem, remain topical for contemporary antenna engineering.
The Project authors possess a large experience of solving complicated electrodynamic problems with PC at a rigorous statement [1-10]. Particularly, they elaborated the EDEM software package [11,12], oriented toward PCs and allowing to solve such problems. In the course of carrying out the works under the given Project, it is expected to modify that software package as applied to the study of the proposed new subminiature antennas, aimed at optimizing their parameters, taking into account the peculiarities of the problem to be solved.
The Project objective is the development of subminiature new-type wide-band antennas, based on loop antennas with a triangle shape of various purpose. In the course of works it is expected to develop a software package, allowing to design and optimize the given class of antennas at a rigorous electrodynamic statement as applied to the practical problems to be solved.
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