Helical UHF transmitting and/or receiving antenna
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United States of America Patent
Stats
-
Sep 8, 1992
Grant Date -
N/A
app pub date -
Dec 13, 1990
filing date -
Dec 18, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A helical UHF transmitting and/or receiving antenna for electromagnetic waves in the frequency range of between 400 MHz and 1000 MHz. The helical antenna is arranged within a closed housing which is permeable to HF radiation. The UHF signal is supplied to an end of the helical antenna through a coaxial connector. The helix of the antenna has at least one and a half turns but not more than ten turns. Diameter, height and total length of the antenna wire are very small in comparison to the wave length. A mechanically-operated device permits a continuous change of the height of the antenna helix in axial direction thereof or of the diameter transversely of the antenna axis.
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