Antenna with variably tuned parasitic element
First Claim
Patent Images
1. 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 and loading the parasitic element, the tuning circuit being dynamically variable by varying a reactance of the tuning circuit in real-time to adjust the operational frequencies of the antenna element coupled to the tuned parasitic element, wherein the parasitic element is electrically connected to the tuning circuit at one end and is unconnected at the other end, and wherein the tuning circuit is coupled to ground.
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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.
290 Citations
19 Claims
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1. A radio communication device with an antenna apparatus comprising:
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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 and loading the parasitic element, the tuning circuit being dynamically variable by varying a reactance of the tuning circuit in real-time to adjust the operational frequencies of the antenna element coupled to the tuned parasitic element, wherein the parasitic element is electrically connected to the tuning circuit at one end and is unconnected at the other end, and wherein the tuning circuit is coupled to ground. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A radio communication device with an antenna apparatus comprising:
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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 and loading the parasitic element, the tuning circuit being dynamically variable by varying a reactance of the tuning circuit in real-time to adjust the operational frequencies of the antenna element coupled to the tuned parasitic element, wherein the parasitic element is electrically connected to the tuning circuit at one end and is connected to ground at the other end, and wherein the tuning circuit is coupled to ground. - View Dependent Claims (12, 13, 14)
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15. A radio communication device with an antenna apparatus comprising:
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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 and loading the parasitic element, the tuning circuit being dynamically variable by varying a reactance of the tuning circuit in real-time to adjust the operational frequencies of the antenna element coupled to the tuned parasitic element. - View Dependent Claims (16, 17, 18)
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19. A method for tuning an antenna apparatus, the method comprising the steps of:
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providing a parasitic element electromagnetically coupled to an antenna element and a variable reactive load coupled to the parasitic element; and
dynamically tuning the reactive load by varying a reactance of a matching circuit connected to the reactive load in real-time to adjust the operational frequencies of the antenna element coupled to the tuned parasitic element.
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Specification