| 摘要 |
In a waveguide lens (1) for primarily circularly or linearly . polarized electromagnetic radiation there is one or several rotationally symmetrical rings (5), arranged concentrically about a lens axis (3), for focusing of the incoming part of an electric magnetic wave, which has a polarization parallel to the rings (5), to a focus (11). For a still more efficient reception one or more plates (29, 29') arranged radially are designed so that the radial component of the electromagnetic wave is focused to the same focus (11). Alternatively there is instead of rings (5) one or more spiral arms (37) extending from the lens axis (3). The lens (1) eliminates the problem of existing lens types that they only receive waves having a predetermined polarization which must be adapted to the orientation of the lens plates and the phase shifting elements. It makes for instance the reception of satellite signals more difficult, where the satellite signal is polarized in relation to the earth axis and the latitude where the satellite is located. The lens (1) focuses all polarizations equally much which is especially favourable for circularly polarized waves but is also valid for plane polarized waves.
|
