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US 7,403,161 B2Granted
Multiband antenna in a communication device
AssigneeMotorola, Inc.
InventorsCarlo DiNallo, Marco Maddaleno
Life of this patent
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Abstract
An apparatus is disclosed for a multiband antenna (102) in a communication device (100). An apparatus that incorporates teachings of the present invention may include, for example, an antenna having a finite ground surface (201, 401), and an elongated conductor (206, 406) that is characterized by a length and is spaced from the finite ground surface. The elongated conductor has a first slot (208, 408) extending through a substantial portion of the length of the elongated conductor, and a second slot (210, 410) having a shorter length than the first slot. The antenna further has a grounding conductor (216, 416) coupling the finite ground surface to the elongated conductor, and a signal feed conductor (214, 414) coupling to the elongated conductor.
Claims18
An antenna, comprising:
- a finite ground surface, wherein the ground surface comprises a ground plane;
- an elongated conductor that is characterized by a length and is spaced from the finite ground surface, wherein the elongated conductor is supported on the ground plane by a dielectric spacer, and wherein the elongated conductor comprises a first slot extending through a substantial portion of the length of the elongated conductor, and a second slot having a shorter length than the first slot;
- a grounding conductor coupling the finite ground surface to the elongated conductor;
- a signal feed conductor coupling to the elongated conductor;
- and
- a communication circuit capable of processing signals at a first frequency, a second frequency, a third frequency, and a fourth frequency;
- wherein the antenna supports:
- a common mode, at the first frequency, in which at any given instant current summed over the central cross section of the elongated conductor passes in the elongated conductor in opposite directions;
- a differential mode, at the second frequency, in which at any given instant current runs in a common direction on the elongated conductor;
- a slot mode, at the third frequency, in which at any given instant current runs in opposite directions on opposite sides of the first slot;
- and
- a loop mode, at the fourth frequency, in which at any given instant current runs in circular directions about the second slot.
9 more elements
A communication device, comprising:
- an antenna;
- a transceiver coupled to the antenna;
- and
- a controller programmed to cause the transceiver to exchange signals with a communication system, and wherein the antenna comprises:
- a finite ground surface;
- an elongated conductor that is characterized by a length and is spaced from the finite ground surface, wherein the elongated conductor includes a first end, a second end, a point intermediate the first end and the second end, a first slot that extends through a substantial portion of the length of the elongated conductor, and a second slot having a substantially shorter length than the first slot;
- a grounding conductor coupling the finite ground surface to the elongated conductor;
- a signal feed conductor coupling to the elongated conductor;
- wherein the antenna supports:
- a common mode, at the first frequency, in which current summed over the center cross section of the elongated conductor passes in the elongated conductor in opposite directions;
- a differential mode, at the second frequency, in which current runs in a common direction on the elongated conductor;
- a slot mode, at the third frequency, in which current runs in opposite directions on opposite sides of the first slot;
- and
- a loop mode, at the fourth frequency, in which current runs in circular directions about the second slot.
11 more elements
A communication device, comprising:
- an antenna;
- and
- a transceiver coupled to the antenna for exchanging messages with a communication system;
- wherein the antenna comprises:
- a finite ground surface;
- an elongated conductor that is characterized by a length and is spaced from the finite ground surface, wherein at least a substantial portion of the elongated conductor follows a substantially U shaped contour, and wherein the elongated conductor includes a first slot that extends through a substantial portion of the length of the elongated conductor, and a second slot having a shorter length than the first slot;
- a grounding conductor coupling the finite ground surface to the elongated conductor;
- a signal feed conductor coupling to the elongated conductor;
- and
- a communication circuit capable of processing signals at a first frequency, a second frequency, a third frequency, and a fourth frequency;
- wherein the antenna supports:
- a common mode, at the first frequency, in which at any given instant current summed over the central cross section of the elongated conductor passes in the elongated conductor in opposite directions;
- a differential mode, at the second frequency, in which at any given instant current runs in a common direction on the elongated conductor;
- a slot mode, at the third frequency, in which at any given instant current runs in opposite directions on opposite sides of the first slot;
- and
- a loop mode, at the fourth frequency, in which at any given instant current runs in circular directions about the second slot.
13 more elements
Dependencies are inferred from the claim text.