Broadband Integrated Lens for Illuminating Reflector Antenna With Constant Aperture Efficiency
Carlos A. Fernandes, Eduardo B. Lima, Jorge R. Costa
IEEE Transactions on Antennas and Propagation
Volume: 58, Issue, 12, Dec. 2010
3805 - 3813
Broadband stable radiation pattern, broadband stable phase center position, integrated lens antennas, millimeterand submillimeter wave antennas, reflector feed
Anew integrated shaped lens antenna configuration is described with frequency stable radiation pattern and phase center position across a broad 1:3 frequency band, which can be used for focal plane reflector feeding in quasi-optical radio telescope systems. The lens is compatible with the integration of ultrawideband uniplanar printed feeds at its base and equally broadband mixing devices, like the Hot Electron Bolometer (HEB), although these are not used in the present work. Measurements on a scaled mm-wave lab prototype have confirmed stable performance versus frequency, with only +-1 dB directivity variation, and better than 94% Gaussicity, thanks to the possibility to impose a predefined output radiation pattern template. Simulations were performed to test the illumination of an off-set parabolic reflector by the lens radiation pattern, which confirmed reasonably constant aperture efficiency in the order of 78% across the 100% bandwidth.
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