lens antenna वाक्य

उदाहरण वाक्य

1. In contrast, if multiple feeds are used with a parabolic reflector, all must be within a small angle of the optical axis to avoid suffering offset systems, dish antennas suffer from the feed and its supporting structure partially obscuring the main element ( " aperture blockage " ); in common with other refracting systems, the Luneburg lens antenna avoids this problem.