Double-action antenna
First Claim
Patent Images
1. An antenna structure for a radio communications set wherein said set has an antenna port for coupling to said antenna structure, the antenna structure comprising;
- a first antenna part having a first end and a second end, said first antenna part being wound into a multiple turn coil, and the first end of said first antenna part being coupled to said antenna port; and
a second antenna part being movable with respect to the first antenna part, said second antenna part being connected to said first antenna part at a point which is between said first and second ends and is more than one turn of the coil from either end, said second antenna part forms with at least that part of said first antenna part which is between said point and said first end, a serial connection which connects to said antenna port.
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Abstract
The invention relates to a double-action, two-piece antenna structure whose first antenna part, preferably a helix antenna (1), is fixedly connected to the antenna port of a radio communications set, and the second antenna port, preferably a rod antenna (2), is movable with respect to the first antenna part. In an active position, the second antenna part (2) is coupled to the first antenna part (1), forming a serial connection whose electrical length is as great as or greater than the electrical length of the first antenna part alone.
56 Citations
12 Claims
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1. An antenna structure for a radio communications set wherein said set has an antenna port for coupling to said antenna structure, the antenna structure comprising;
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a first antenna part having a first end and a second end, said first antenna part being wound into a multiple turn coil, and the first end of said first antenna part being coupled to said antenna port; and a second antenna part being movable with respect to the first antenna part, said second antenna part being connected to said first antenna part at a point which is between said first and second ends and is more than one turn of the coil from either end, said second antenna part forms with at least that part of said first antenna part which is between said point and said first end, a serial connection which connects to said antenna port. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification