| 摘要 |
<p>Multi-beam antennas (10) with relatively large effective apertures for high antenna gain are provided for tower or pole mounting for cellular and other uses. Low wind resistance is achieved by use of thin cylindrical radiating units (11, 12, 13, 14) and thin cylindrical tuned reflector units (22). Each radiating unit includes separately excited upper and lower radiators (11a, 11b; 12a, 12b; 13a, 13b; 14a, 14b) each including a microstrip pattern of a phase reversed series of half-wave transmission line sections (46/48, 50/44) on a substrate (42) enclosed in a fiberglass tube radome (40). Each tuned reflector unit (22) includes a resonant stack of electrically isolated metal rods (62) enclosed in a fiberglass radome (60). In one embodiment, four cylindrical radiating units (11, 12, 13, 14), each including upper and lower radiators, are laterally spaced in front of upper and lower reflector configurations, each including seven laterally spaced tuned reflector units (22). Four beams are provided by a beam forming network (20) arranged to couple antenna element signal feeds to the four upper radiators (11a, 12a, 13a, 14a) and corresponding reverse phase signal feeds to the four lower radiators (11b, 12b, 13b, 14b).</p> |
