Dual-band antenna coupler for a portable radiotelephone
First Claim
1. An antenna coupling device for coupling radio frequency signals from a communication device having an antenna and at least one externally accessible ground point, the communication device operable in two frequency bands, the antenna coupling device comprising:
- a ground plane having an upper surface;
an antenna coupler mounted on said ground plane upper surface, for coupling radio signals to and from the communication device antenna;
at least one ground pin, coupled to said upper surface of said ground plane, for contacting the at least one externally accessible ground point; and
a matching circuit coupled to said antenna coupler to generate a predetermined impedance to match said antenna coupler to the communication device antenna at each of the first and second frequency bands.
1 Assignment
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Accused Products
Abstract
A dual-band antenna coupler for use in an adapter for portable radiotelephone. A plurality of curved bands of metal are positioned on a ground plane, with at least two of the plurality of curved bands of metal being electrically isolated from the ground plane so as to couple radio frequency (RF) signals to and from the antenna of the portable radiotelephone. The isolated curved bands of metal couple RF signals between the antenna of the portable radiotelephone and first and second matching circuits designed to match the portable radiotelephone antenna at each of the respective frequency bands. A selector switch coupled to the output of the matching circuits selects the appropriate matching circuit output for connection to an external antenna. The adapter also includes at least one ground pin mounted on the ground plane. When the portable radiotelephone is interfaced with the antenna coupler, the ground pin makes electrical contact with a ground reference connection on the portable radiotelephone.
141 Citations
20 Claims
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1. An antenna coupling device for coupling radio frequency signals from a communication device having an antenna and at least one externally accessible ground point, the communication device operable in two frequency bands, the antenna coupling device comprising:
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a ground plane having an upper surface; an antenna coupler mounted on said ground plane upper surface, for coupling radio signals to and from the communication device antenna; at least one ground pin, coupled to said upper surface of said ground plane, for contacting the at least one externally accessible ground point; and a matching circuit coupled to said antenna coupler to generate a predetermined impedance to match said antenna coupler to the communication device antenna at each of the first and second frequency bands. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An antenna coupling device for coupling radio frequency signals from a communication device having an internal antenna and at least one externally accessible ground point, the communication device operable in two frequency bands, the antenna coupler comprising:
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a connector coupleable to an external antenna; a ground plane having an upper surface and sized to match the communication device; an antenna coupler mounted on said ground plane upper surface, for coupling radio signals between the communication device antenna and said external antenna connector; at least one ground pin, coupled to said upper surface of said ground plane, for contacting the externally accessible ground point; and a matching circuit coupled to said antenna coupler to receive the radio frequency signals and to generate a predetermined impedance to match said antenna coupler to the communication device antenna and said external antenna connector at each of the first and second frequency bands. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification