Antenna coupler for portable telephone
First Claim
1. A unit for coupling a portable telephone having a built-in antenna to an external antenna, comprising:
- a shell having a cavity shaped to receive the portable telephone;
an antenna clip mounted in the shell for connecting the portable antenna built-in antenna to the external antenna, the antenna clip being positioned in the shell such that when the portable telephone is received into the cavity, the antenna clip engages an exposed direct electrical contact mounted on the built-in antenna;
a choke mounted in the shell for providing electromagnetic shielding of the built-in antenna, the choke including a first section that is coupled to a ground plane of the portable telephone when the portable telephone is received into the shell cavity, and a second section that substantially surrounds the portable telephone built-in antenna when the portable telephone is received into the shell cavity, the choke providing high impedance at an operating frequency band of the telephone, thereby minimizing impedance mismatch between the built-in antenna and the external antenna and ensuring low loss between the telephone and the external antenna at the operating frequency band.
7 Assignments
0 Petitions
Accused Products
Abstract
The present invention provides a system for coupling a portable telephone with a built-in antenna to an external antenna. The portable telephone built-in antenna includes an exposed direct electrical contact at its base. When the portable telephone unit is placed into a receiving cavity in in external antenna coupling unit, the exposed contact is engaged by an antenna clip for connection to the external antenna. A two-section choke in the coupling unit provides shielding for the built-in antenna. The first section of the choke is coupled to the ground plane of the portable telephone, and the second section of the choke surrounds the antenna. In a preferred embodiment of the invention, the choke provides shielding of the built-in antenna at a lower and at a higher frequency band.
48 Citations
18 Claims
-
1. A unit for coupling a portable telephone having a built-in antenna to an external antenna, comprising:
-
a shell having a cavity shaped to receive the portable telephone; an antenna clip mounted in the shell for connecting the portable antenna built-in antenna to the external antenna, the antenna clip being positioned in the shell such that when the portable telephone is received into the cavity, the antenna clip engages an exposed direct electrical contact mounted on the built-in antenna; a choke mounted in the shell for providing electromagnetic shielding of the built-in antenna, the choke including a first section that is coupled to a ground plane of the portable telephone when the portable telephone is received into the shell cavity, and a second section that substantially surrounds the portable telephone built-in antenna when the portable telephone is received into the shell cavity, the choke providing high impedance at an operating frequency band of the telephone, thereby minimizing impedance mismatch between the built-in antenna and the external antenna and ensuring low loss between the telephone and the external antenna at the operating frequency band. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
-
16. A system for coupling a portable telephone having a built-in antenna to an external antenna, comprising:
-
an exposed direct electrical contact mounted to the portable telephone built-in antenna; a shell having a cavity shaped to receive the portable telephone; an antenna clip mounted in the shell for connecting the portable telephone built-in antenna to the external antenna, the antenna clip being positioned in the shell such that when the portable telephone is received into the cavity, the antenna clip engages the exposed direct electrical contact mounted to the portable telephone the built-in antenna; a choke mounted in the shell for providing electromagnetic shielding of the built-in antenna, the choke including a first section that is coupled to a ground plane of the portable telephone when the portable telephone is received into the shell cavity, and a second section that substantially surrounds the portable telephone built-in antenna when the portable telephone is received into the shell cavity, the choke providing high impedance at an operating frequency band of the telephone, thereby minimizing impedance mismatch between the built-in antenna and the external antenna and ensuring low loss between the telephone and the external antenna at the operating frequency band. - View Dependent Claims (17)
-
-
18. A method for coupling a portable telephone having a built-in antenna to an external antenna, comprising:
-
connecting the portable telephone built-in antenna to the external antenna by a direct electrical connection; coupling a first section of a two-section choke proximate to a ground plane of the portable telephone; surrounding the built-in antenna with a second section of the two-section choke, such that the choke provides electromagnetic shielding of the built-in antenna, the choke providing high impedance at an operating frequency band of the telephone, thereby minimizing impedance mismatch between the built-in antenna and the external antenna and ensuring low loss between the telephone and the external antenna at the operating frequency band.
-
Specification