Variable helical antenna
First Claim
1. A helical antenna, comprising:
- (a) first and second conductive helices extending about a common central axis in the same direction and having first portions interleaved with each other without being in mechanical contact and non-interleaved second portions; and
(b) means for helically moving said second helix, by sliding, longitudinally relative to said first helix.
1 Assignment
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Accused Products
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.
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Citations
11 Claims
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1. A helical antenna, comprising:
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(a) first and second conductive helices extending about a common central axis in the same direction and having first portions interleaved with each other without being in mechanical contact and non-interleaved second portions; and (b) means for helically moving said second helix, by sliding, longitudinally relative to said first helix. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification