Communications: radio wave antennas – Antennas – With lumped reactance for loading antenna
Patent
1976-12-22
1978-09-26
Smith, Alfred E.
Communications: radio wave antennas
Antennas
With lumped reactance for loading antenna
343715, 343880, 343720, H01Q 132, H01Q 900, H01Q 100, H01Q 108
Patent
active
041174933
ABSTRACT:
A radio antenna which can be readily tuned to the exact frequency of operation, easily coupled to a coaxial feed-line with minimum standing wave ratio and/or which is normally vertical and can be used where horizontal space is at a premium, such as: indoors or on boats. The antenna has a center loading coil, the inductance of which is adjusted by means of a split coaxial sleeve axially moveable relative to the coil. The input impedance of the antenna is adjusted relative to the impedance of the feed-line by means of a coupling transformer, the transformation ratio of which is controlled by means of a coaxial split metal sleeve axially adjustable relative thereto. A coaxial cable wound into a coil around a ferrite core attenuates the high ratio frequency voltage on the end of the antenna to the feed-line. For indoor use, the antenna is housed in an extensible tubular housing which can be extended to engage the ceiling and floor of a room to hold the antenna in vertical position.
REFERENCES:
patent: 2480172 (1949-08-01), Willoughby
patent: 3400403 (1968-09-01), Spilsbury
patent: 3576578 (1971-04-01), Harper
patent: 3961332 (1976-06-01), Middlemark
Harry Lowenstein, Designing & Building a Five Band Indoor Antenna, In CQ, pp. 46-47, Dec. 1967.
Barlow Harry E.
New-Tronics Corp.
Smith Alfred E.
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