H - Electricity – 01 – Q
Patent
H - Electricity
01
Q
351/1, 351/51
H01Q 15/02 (2006.01) G01R 29/10 (2006.01) H01Q 15/08 (2006.01) H01Q 19/00 (2006.01) H01Q 19/06 (2006.01)
Patent
CA 1100625
PLANE WAVE LENS Abstract of the Disclosure Various aspects of electro-magnetic testing are facilitated by inserting a foamed plastic dielectric lens at a particular position between the radiating source and the test aperture. The lens is constructed according to electro- optic formulae and the radiation wavelength to produce a plane wave of uniform phase. This makes possible testing under far field conditions in test cells of modest size, which has heretofore been possible only with elaborate parabolic reflectors. The lens can be manufactured from any plastic having a dielectric constant in the range of 1.05 to 1.5 by either blowing the plastic in a suitable mold, or by machining from a preformed foam block. In accordance with a further aspect of the invention, as described in the Supplementary Disclosure, to control extraneous energy contributed by reflections from the flat face of the lens, this surface is provided with two layers of high-performance absorber material. The absorber layers are loaded with conductive carbon to provide desired insertion loss and attached to the flat face of the lens.
294715
Gowling Lafleur Henderson Llp
Plessey Incorporated
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