| 摘要 |
<p>A dielectric antenna lens (10) for planar wavefront/focal point conversion is configured of a series of concentric rings, each of which is contoured from a rear face (7) to inclined termination edges (15) that are delimited by the functional performance of the lens and which assist in the manufacture of the lens. In addition, the bottom edge of each ring, rather than terminate at a cylindrical side wall of an adjacent ring, terminates at a flattened region (25) between itself and the adjacent ring. This flattened region effectively eliminates the acute angle wedge between rings and, together with the inclined termination edges of the rings, serves to enable the lens to be easily manufactured, as by injection molding (39), with the flattened land portions and inclined termination edges making possible removal of the lens from the injection mold. As a further aspect of the present invention there is provided a multiple wavelength conversion arrangement employing the dielectric lens (10) in combination with a wavelength selective (e.g. dichroic) filter (41), enabling the lens to be used as part of a compact microwave transceiver unit (51, 55) operating at a plurality of different frequencies.</p> |
