Motorola Corporation

Christopher P Cash

Rachid M Alameh

Eric LeRoy Krenz

James P Phillips

Narendra Pulimi

Roger L Scheer

Paul W Reich

Narenda Pulimi

Jeffrey Y Ho

An electronic device () has a multi-state antenna ground structure () integrated into the device housing. Configuration of the electronic device () for use in one of at least two operable configurations automatically causes a switching of the ground structure to improve antenna efficiency. Metal plates () are secured within movable portions () of the device housing such that in a first configuration the metal plates are in close proximity and act as a low impedance path for switching the ground structure to a first state. In a second configuration of the electronic device () the plates are separated an act as a high impedance path for switching the ground structure to a second state.

Electronic device having a multi-state antenna ground structure

A multi-band radio communication device with an antenna system that includes an antenna element and a parasitic element located in proximity to the antenna element. A tuning circuit is coupled to the parasitic element. The tuning circuit is variable to adjust the parasitic load on the antenna element to provide variable operating frequencies and bandwidths for the communication device.

Antenna with variably tuned parasitic element

A communication device operable in multiple frequency bands includes a branching antenna adapted to operate in at least two frequency bands. The antenna includes a first conductive element having a connection at one end for driving the antenna. The first conductive element is resonant at a first frequency. On the first conductive element, a feed point is located away from either end of the first conductive element, and particularly the driving connection point. A second conductive element is coupled to the feed point such that the second conductive element in conjunction with the portion of the first conductive element between the drive connection and the feed point is resonant at a second frequency. This allows for a more compact and versatile multi-band antenna.

Antenna with branching arrangement for multiple frequency bands

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Woodstock, IL, United States of America

Christopher P Cash