Adjustable antenna arrangement for a portable radio
First Claim
Patent Images
1. An antenna arrangement as for a hand-held transceiver and comprising in combination:
- a helical antenna means mounted on the transceiver and coupled to be driven by the circuitry of the transceiver; and
an extendable half-wave antenna means, mounted on the transceiver and adapted to be capacitively coupled to said helical antenna means when in the extended position and to be substantially decoupled therefrom when in the retracted position.
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Abstract
An extendable half-wave dipole is capacitively coupled to a driven resonant helical antenna for use as on a hand-held, two-way portable radio, the helix being end fed. The dipole may be mounted adjacent to or collinear with the axis of the helix. The collinear mounting requires non-conductive portions on each end of the dipole. Optimum dimensional and performance characteristics are available without switching.
76 Citations
9 Claims
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1. An antenna arrangement as for a hand-held transceiver and comprising in combination:
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a helical antenna means mounted on the transceiver and coupled to be driven by the circuitry of the transceiver; and an extendable half-wave antenna means, mounted on the transceiver and adapted to be capacitively coupled to said helical antenna means when in the extended position and to be substantially decoupled therefrom when in the retracted position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification