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|Title:||Broadband integrated lens for illuminating reflector antenna with constant aperture efficiency|
|Authors:||Fernandes, Carlos A.|
Lima, Eduardo B.
Costa, Jorge R.
|Keywords:||Broadband stable radiation pattern|
Broadband stable phase center position
Integrated lens antennas
Millimeterand submillimeter wave antennas
|Abstract:||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 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.|
|Appears in Collections:||CTI-RI - Artigos em revistas científicas internacionais com arbitragem científica|
IT-RI - Artigo em revista internacional com arbitragem científica
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|Costa_2010 IEEE Transactions on Antennas and Propagation.pdf||2.32 MB||Adobe PDF||View/Open|
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