| 摘要 |
<p>An antenna/downconverter (34) directed to the subscription television distribution industry having low cross polarization and broad bandwidth. The antenna/downconverter (34) includes a director (40) mounted to a housing (38) which defines a reflector cup (64), side lobe suppression rim (48) and a housing defining a chamber which provides environmental protection for downconverter electronics. Received microwave energy is coupled to the downconverter electronics from a point radially inward from the perimeter of a first receive disc (82) axially spaced within the reflector cup (64) using a probe surrounded by a conductive probe shield (88) integral to the reflector cup. A second receive disc (94) having a different radius than the first receive disc and axially spaced within the reflector cup is parasitically coupled to the first probe. The housing (38) defines a plurality of pair of jaws (122) which facilitate alignment to cross-polarized microwave signals when an installer receives a mounting mast (36) in a selected one of the jaws.</p> |
