Patent EP0855759A2 successfully refreshed from Google Patents.
EP0855759A2
Expired / Lapsed
EP
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Simple dual-frequency antenna
Assignee: Pulse Finland Oy
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Filing: 1998-01-23
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Granted: —
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Expires: 2018-01-23
Abstract
Abstract An antenna construction comprises a feed conductor (11, 21) and an antenna element (12, 22, 24, 25, 26, 27) which has a first end and a second end. The feed conductor is substantially electrically unshielded and coupled to the antenna element at a tapping point (13, 23) located between the first end and second end of the antenna element, said tapping point dividing the antenna element into two portions having unequal electrical lengths. The antenna element may be a helix (12), a whip (22) or another known two-ended antenna element or a combination of those.
Inventors
- 👤 Petteri Annamaa
- 👤 Seppo Raatikainen
- 👤 Erkki Niemi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 11:29
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/12; H01Q1/22; H01Q1/24; H01Q1/241; H01Q1/242; H01Q1/36; H01Q1/362; H01Q21/00; H01Q21/28; H01Q21/29; H01Q5/00; H01Q5/30; H01Q5/307; H01Q5/342; H01Q5/357; H01Q5/364; H01Q5/371; H01Q9/00; H01Q9/04; H01Q9/16; H01Q9/18; H01Q9/20; H01Q9/22; H01Q9/26; H01Q9/27; H04; H04B; H04B1/00; H04B1/38; H04B1/3827; H04B1/3833
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
75 words
An antenna construction comprising a feed conductor (11, 21) and an antenna
element (12, 22, 24, 25, 26, 27), said antenna element having a first end and a
second end, characterised in that the feed conductor is substantially electrically
unshielded and coupled to the antenna element at a tapping point (13, 23) which is
located between said first end and second end and which divides the antenna
element into two parts having unequal electrical lengths.
Claim 2
Dependent Claim
18 words
The antenna construction of claim 1, characterised in that the antenna element
is a cylindrical coil conductor (12).
Claim 3
Dependent Claim
44 words
The antenna construction of claim 2, characterised in that said cylindrical coil
conductor includes at the tapping point a portion which is wound more tightly than
the rest of the cylindrical coil conductor and to which an end of the feed conductor is
coupled.
Claim 4
Dependent Claim
17 words
The antenna construction of claim 1, characterised in that the antenna element
is a straight conductor (22).
Claim 5
Dependent Claim
24 words
The antenna construction of claim 1, characterised in that the antenna element
is a conductive pattern formed on the surface of a dielectric medium.
Claim 6
Dependent Claim
32 words
The antenna construction of claim 1, characterised in that the antenna element
is a series connection formed by a cylindrical coil conductor (24, 26) and at least one
straight conductor (25, 27).
Claim 7
Dependent Claim
32 words
The antenna construction of claim 6, characterised in that the tapping point
(23) is located at the junction of said cylindrical coil conductor (26) and said at least
one straight conductor (27).
Claim 8
Dependent Claim
23 words
The antenna construction of claim 6, characterised in that the tapping point is
located between the ends of said cylindrical coil conductor (24).
Claim 9
Dependent Claim
28 words
The antenna construction of claim 1, characterised in that it additionally
comprises a second antenna element (60a) which can be moved in relation to said
first antenna element.
Claim 10
Dependent Claim
42 words
The antenna construction of claim 9, characterised in that said second antenna
element is a whip element that can be moved along its longitudinal axis in relation to
the first antenna element between a first extreme position and a second extreme
position.
Claim 11
Dependent Claim
69 words
The antenna construction of claim 10, characterised in that in said first extreme
position the whip element is coupled (67) to said feed conductor so that the electrical
length of the series connection formed by the feed conductor and the whip element
is substantially the same as the electrical length of the series connection formed by
the feed conductor and one of the unequally-long portions of said antenna element.
References Cited (Backward Citations)
No citation records indexed.
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