Transient Near-Field Calculation of Offset Reflector
- 1 канд. физ.-мат. наук, ОАО «Гипрогазцентр» (Нижний Новгород)
- 2 канд. физ.-мат. наук, зав. лаб. Института прикладной физики РАН (Нижний Новгород)
Abstract
We describe the method of calculation of a transient near field of the offset reflector antenna with dipole feed radiated delta - pulse. It is considered, that the effective frequency bandwidth is limited from above and from below, and the maximal wavelength is much less than sizes of the aperture, focal distance of a reflector and distance from a reflector to a observation point. Taking into account these assumptions the transient field can be written using space-time distribution of electrical current over antenna aperture.
Using integration technique for delta-functions of complex argument, at each moment of time we can reduce the two-dimensional integral over a surface to one-dimensional integral over a line. Simple analytical expressions have been found for the transient near-fields of offset reflector antenna. The calculation method can be used for any reflector antenna with a round projection to an aperture plane, including symmetrical parabolic antennas. It is shown, that near-field responses of symmetrical and offset parabolic antennas consist of two impulses. The second impulse of the offset antennas usually has smaller amplitude, compare with symmetrical antennas.
How to cite
Скулкин С.П., Турчин В.И. Расчет импульсного поля офсетной рефлекторной антенны в ближней зоне // Антенны. 2009. № 8. С. 56–59.
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