Design of a shaped double-shell lens feed for a quasi-optical reflector system

ILASH - Software tool for the design of integrated lens antennas

“…ILASH accuracy and reliability can be confirmed in [7]- [8]. Some tested examples are presented next.…”

“…The main challenge is to design one integrated lens antenna with good scanning characteristics and good transmission efficiency that can produce multiple virtual foci compatible with a wide reflector focal arc [8]. The lens prototype is shown in Figure 3a; the ray tracing in Figure 3b shows that the prolongation of the output rays geometrically converge on a focal point defining a clear phase centre far outside the lens body.…”

“…The second example corresponds to a scaled double-shell lens operating at 62.5 GHz to test a new concept for imaging reflector system feeding [8]. The main challenge is to design one integrated lens antenna with good scanning characteristics and good transmission efficiency that can produce multiple virtual foci compatible with a wide reflector focal arc [8].…”

“…It was also specified that the gain scan loss should be lower than 1dB. The double-shell lens was made from MACOR-Polystyrene combination fed by a dedicated waveguide feed described in [8] for 62.5 GHz operation. The feed is displaced along the lens base in the H-plane.…”

Review of 20 Years of Research on Microwave and Millimeter-wave Lenses at "Instituto de Telecomunicaço˜es"

“…In this case, the beam collimation condition was replaced by another one imposing a well-defined phase center position lying far behind the lens body and coincident with the focus of the reflector [28]. This concept has been explored to produce multiple virtual foci in the reflector focal plane using a single lens [61], which is attractive to increase the number of beams using less space than conventional focal plane arrays.…”