Abstract
A coaxial cavity antenna excited by a stacked circular microstrip antenna is investigated as a feed for prime-focus parabolic reflector antennas. The radiation pattern of the proposed cavity-backed antenna is saddle shaped, which widens the −10 dB beamwidths and increases the reflector efficiency especially for deep reflectors with small focal length-to-diameter ratios. With a single-probe feed, the co-polar radiation pattern is slightly asymmetric in the E-plane, but is made symmetric by a differential feeding technique, using two probes. The impedance bandwidth of the proposed feed antenna is 20%. The antenna was fabricated and tested, and it exhibited good agreement between simulation and measurement results. The gain factor of the feed was also studied with a circular-symmetric reflector and provided a gain factor of 79% at f/D = 0.375. This type of feed can be used as an alternative to conventional horn or waveguide feeds, where reduced size and light-weight are desirable with added advantage of easy integration with electronics.
Sign-in/Register to access full text options 
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 callMore From: International Journal of RF and Microwave Computer-Aided Engineering
Disclaimer: 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.
