Simple dual-frequency antenna
First Claim
1. A dual-band antenna construction functioning as two quarter-wave length antennas comprising a feed conductor (11, 21) and a first radiating antenna element (12, 22, 24, 25, 26, 27), said first radiating antenna element having a first end and a second end, characterized in that the feed conductor is substantially electrically unshielded and serves as a radiator together with said first radiating antenna element and is coupled to the first radiating antenna element at a tapping point (13, 23) which is located between said first end and second end, and which divides the first radiating antenna element into two parts having unequal electrical lengths, said first radiating antenna element having a common uni-directional physical characteristic immediately before and after said tapping point.
5 Assignments
0 Petitions
Accused Products
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 the 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.
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Citations
11 Claims
- 1. A dual-band antenna construction functioning as two quarter-wave length antennas comprising a feed conductor (11, 21) and a first radiating antenna element (12, 22, 24, 25, 26, 27), said first radiating antenna element having a first end and a second end, characterized in that the feed conductor is substantially electrically unshielded and serves as a radiator together with said first radiating antenna element and is coupled to the first radiating antenna element at a tapping point (13, 23) which is located between said first end and second end, and which divides the first radiating antenna element into two parts having unequal electrical lengths, said first radiating antenna element having a common uni-directional physical characteristic immediately before and after said tapping point.
Specification