Antenna with variably tuned parasitic element
AssigneeMotorola, Inc.
InventorsJames P. Phillips, Christopher P. Cash, Jeffrey Y. Ho, Narendra Pulimi, Paul W. Reich, Roger L. Scheer
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Abstract
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.
Claims20
A radio communication device with an antenna apparatus comprising:
- an antenna element;
- a parasitic element located in proximity to the antenna element and electromagnetically coupled thereto;
- and
- a tuning circuit coupled to the parasitic element, the tuning circuit being variable to adjust the operational frequencies of the antenna element.
A radio communication device with an antenna apparatus comprising:
- a helical antenna element;
- a parasitic element located in proximity to the antenna element and capacitively coupled thereto;
- and
- a tuning circuit coupled between the parasitic element and ground, the tuning circuit being variable to adjust the operational frequencies of the antenna element.
A method for tuning an antenna apparatus, the method comprising the steps of:
- providing a parasitic element electromagnetically coupled to an antenna element and a variable reactive load coupled to the parasitic element;
- and
- tuning the reactive load to adjust the operational frequencies of the antenna element.
Dependencies are inferred from the claim text.