Antenna device and radio frequency IC device
First Claim
1. An antenna device included in a radio frequency IC device that is arranged to perform radio frequency communication with an external device, the antenna device comprising:
- an antenna element including an antenna coil arranged to transmit or receive a radio frequency communication signal to or from the external device; and
an additional resonance circuit that is connected to the antenna element, that includes at least one inductor, and has a resonance frequency characteristic different from a resonance frequency of the antenna element;
whereina physical dimensional size of the at least one inductor of the additional resonance circuit is smaller than a physical dimensional size of the antenna coil.
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Accused Products
Abstract
An antenna device is arranged to transmit or receive a radio frequency communication signal to or from an external device such as a reader/writer, and is arranged such that an antenna resonance circuit including an antenna coil and a capacitor is connected to an additional resonance circuit including an inductor and a capacitor. A radio frequency IC device preferably includes the antenna device and a radio frequency IC. The antenna device is constructed such that a change in characteristics thereof caused by a change in the distance between a radio frequency IC device and a reader/writer is minimized, and the radio frequency IC device performs communication with high reliability.
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Citations
12 Claims
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1. An antenna device included in a radio frequency IC device that is arranged to perform radio frequency communication with an external device, the antenna device comprising:
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an antenna element including an antenna coil arranged to transmit or receive a radio frequency communication signal to or from the external device; and an additional resonance circuit that is connected to the antenna element, that includes at least one inductor, and has a resonance frequency characteristic different from a resonance frequency of the antenna element;
whereina physical dimensional size of the at least one inductor of the additional resonance circuit is smaller than a physical dimensional size of the antenna coil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification