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Telecommunications and Radio Engineering
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Telecommunications and Radio Engineering

DOI: 10.1615/TelecomRadEng.v55.i4.30
7 pages

Frequency Dependences of Scattering Matrices in the Resonance Domain

V. I. Lutsenko
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12 Academician Proskura St., Kharkiv 61085, Ukraine
S. Y. Tolstel
Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkov 61085, Ukraine

RÉSUMÉ

Experimental results are presented, concerning frequency dependences of scattering matrices of wire-grid, lamellar and volume models of small size targets. Resonances have been revealed that exist owing to the polarization effects of mutual connection of currents flowing in vertically and horizontally oriented elements of the structure. As a result, the effective cross-section area may increase essentially (up to values commensurable with the scattering cross-section of a resonant half-wave dipole) when the radar wavelength is roughly four times longer than the vertical scale-size of the object and the transmit and receive antennas are both vertically polarized. This effect should be taken into account in the design of decameter wavelength ground-wave radars. Also, it has been found that cross-section areas in those cases where the transmit antenna is polarized horizontally, while the receive antenna is vertical, is nearly of the same magnitude as in the case of two horizontally polarized antennas. The value is comparable with the cross-section area of the resonant dipole. This should be borne in mind for the development of decameter wavelength bistatic radars employing target irradiation with a space (ionospheric) wave.