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antenna, invented by Albert Beck and Harald Friis in 1941 and developed at Bell Labs in the 1950s. They consist of a vertical flaring metal horn fed with a 2.8 in. circular waveguide, with a reflector mounted in the mouth at a 45° angle, so the beam of microwaves is emitted horizontally (the aperture of these antennas, facing right, is covered by a plastic sheet to keep out rain). The reflector is a segment of a parabolic reflector, so the antenna is equivalent to a parabolic antenna fed off-axis. The advantage of this type of antenna over an ordinary parabolic (dish) antenna is that it has very small sidelobes; that is it picks up very little radiation from directions outside its main beam axis. This allows the same microwave frequencies to be used by several nearby antennas without interfering with each other. These AT&T model KS-15676 L9 antennas have a gain of about 43 dBi and produce a beamwidth (HPBW) of about 1° at 6 GHz. Backlobe sensitivity is -60 to -80 dBi. (From
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This is part of the TD-2 AT&T Long Lines microwave relay system, created in 1955 to relay telephone calls, television shows, and other data from point to point in the US. The system uses C-band frequencies in two bands at 4 and 6 GHz. This type of antenna is called a Hogg or horn-reflector
1009:{{Information |Description={{en|Antennas on the roof of a microwave relay station near Madison St. and 17th Ave, Capitol Hill, Seattle, Washington state, USA.}} This is part of a system created by AT&T to relay telephone calls and other data from point t
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151:) Microwave links like this use 2 antennas (one transmitting and one receiving) to send a beam of microwaves of a few watts power to a similar station about 30 miles away. Each antenna can carry tens of thousands of telephone calls.
440:– You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
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560:==Summary== {{Information |Description={{en|A radio station (?) near Madison St and 17th Ave, Capitol Hill, Seattle}} |Source=Own photo |Date=2007-Mar-10 |Author=] |Permission={{self2|GFDL|cc-b
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Microwave horn antennas on the roof of a telephone switching center near
Madison St. and 17th Ave, Capitol Hill, Seattle, Washington state, USA.
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I, the copyright holder of this work, hereby publish it under the following licenses:
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KS-15676 Horn
Reflector Antenna Description, Bell System standards, AT&T
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licensed with Cc-by-sa-2.5,2.0,1.0, Cc-by-sa-3.0-migrated, GFDL
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243:Cropped image, brightened to bring out detail
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248:Seattle-Capitol-Hill-Radio-Antennas-3357.jpg
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173:Seattle-Capitol-Hill-Radio-Antennas-3357.jpg
423:– to copy, distribute and transmit the work
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1107:Микроволновое излучение
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658:copyrighted
444:share alike
438:attribution
346:share alike
340:attribution
312:1.0 Generic
308:2.0 Generic
304:2.5 Generic
229:This is a
128:Description
1411:Saturation
1137:Băng tần C
1015:File usage
996:699 × 951
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938:millimetre
831:image/jpeg
816:media type
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27:File usage
1421:Sharpness
1039:Microwave
1004:Chetvorno
969:Thumbnail
966:Date/Time
782:inception
404:license.
259:Chetvorno
197:Chetvorno
137:English:
1401:Contrast
1395:Standard
1297:3.203125
1262:Centered
1189:F-number
1145:Metadata
998:(154 KB)
887:f-number
865:0.00625
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427:to remix
421:to share
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323:to share
314:license.
37:Metadata
1325:Pattern
1278:version
1212:17.4 mm
1172:EX-Z50
1097:باند سی
1067:نطاق سي
983:current
978:Comment
606:depicts
586:English
556:Vmenkov
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1236:72 dpi
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181:Author
167:Source
147:Also:
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1206:Lens
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