Variable helical antenna
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jan 4, 2000
Grant Date -
N/A
app pub date -
Jun 26, 1998
filing date -
Jul 4, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A variable helical antenna comprises coaxial conductive first and second helices extending in the same direction. The helices have first portions interleaved with each other without being in mechanical contact. A fixed protection member made in insulative material contains at least a portion of the first helix. A second member made in insulative material is screwed to the first member and contains at least a portion of the second helix. The second helix is attached to the second member. On screwing/unscrewing, the second helix is moved helically, by sliding on itself, relative to the first helix in order to tune the antenna to a required frequency indicated on a graduation on the fixed protection member.
First Claim
Other Claims data not available
Family