Abstract
A quasi-Gregory antenna was designed for subnanosecond impulse radiation. It consists of an ellipsoidal feed, a mirror plane, and a paraboloidal reflector. The second focal point (F <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> ) of the ellipsoidal dish can be regarded as the radiation center of the feed because electromagnetic waves launched from the first focal point of the ellipsoidal dish (F <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</sub> ) are in phase when arriving at point F <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> , according to geometric optics. The equivalent radiation angle at point F <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> is a spherical sector; therefore, it can be designed to geometrically cover the paraboloidal reflector precisely. Gaussian pulses with widths of 200 and 330 ps are used to test the performance of this proposed impulse-radiating antenna (IRA). The 3-dB beamwidth of this proposed IRA with a 1.5 m aperture diameter for the paraboloidal reflector is less than ±3° in the H-plane and less than ±5° in the E-plane. Compared to some existing IRAs, this quasi-Gregory antenna is also suitable for radiating pulses in the subnanosecond regime.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
