Communications: radio wave antennas – Antennas – With reel for antenna
Patent
1977-03-01
1978-09-26
Smith, Alfred E.
Communications: radio wave antennas
Antennas
With reel for antenna
343723, 343745, 343901, H01Q 1112, H01Q 900, H01Q 112, H01Q 110
Patent
active
041174950
ABSTRACT:
An extensible antenna assembly defined by a strip wound into a coil and extensible out of the coil through a guide for forming the strip into an elongated tubular length. In two embodiments the strip is made of a metal whereby the tubular length establishes the antenna for radiating and receiving radio frequency energy and the coiled or wound coil portion defines a coil integrally coupled and electrically continuous with the tubular portion to define a variable inductive reactance for automatically maintaining the antenna resonant to a predetermined frequency in correlation with and responsive to the extended position of the antenna. An insulating means, comprising a strip in the first embodiment and a conical spindle in the second embodiment, insulates the turns of the strip defining the coil and is configured to change the inductance of the coil non-linearly in response to linear movement of the antenna. In an alternative embodiment, a separate coil is associated with the strip and includes a movable contact associated with the coil for varying the inductance of the coil in response to winding and unwinding movement of the strip. In yet another embodiment, a separate coil is associated with the strip and a permeable core is moved into and out of the coil for varying the inductance in response to movement of the strip. In still another embodiment, the strip may be non-conductive and supports a separate conductor with the conductor defining the antenna along the tubular portion of the strip and the coil along the wound portion of the strip.
REFERENCES:
patent: 2157278 (1939-05-01), Blackmore
patent: 2839752 (1958-06-01), Webster
patent: 2894260 (1959-07-01), Ellis
patent: 3146450 (1964-08-01), Dooner
patent: 3541568 (1970-11-01), Lowenhar
patent: 3909830 (1975-09-01), Campbell
Barlow Harry E.
Smith Alfred E.
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