In this article, an original design of a range illuminator based on a stepped-septum polarizer and a dual-mode horn is discussed. However, the designed polarizer can also be used with other waveguide antennas, such as pyramidal horns and corrugated horns. A simple procedure for determining the initial septum geometry for the subsequent optimization is described, and based on this, a two-step septum polarizer is developed. A carefully designed dual-mode horn antenna with a rectangular aperture is then utilized to increase the illuminator's gain and suppress sidelobe levels. Results of full-wave electromagnetic simulations are presented and compared to experimentally measured data with good agreement.
The Time of Arrival (TDOA) based Passive Electronic Support Measure Tracker (PET) radar is worldwide known product of the Pardubice electronic industry. The passive radar antennas have to cover wide frequency band and wide angle in azimuth with sufficient gain. The all polarization detection and all polarization status evaluation are desirable.
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