Antenna apparatus and communication apparatus
AssigneeKabushiki Kaisha Toshiba
InventorsIsao Ohba, Hiroyuki Hotta, Koichi Sato, Masao Teshima
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Abstract
According to one embodiment, an antenna apparatus comprises an antenna element connected to a feeding point, a grounded first lumped constant element connected to the antenna element, and a grounded second and third lumped constant elements connected to the antenna element through a selector. The selector is configured to connect the grounded second lumped constant element to the antenna element in order to lower a resonant frequency of the antenna element, and to connect the grounded third lumped constant element to the antenna element in order to raise the resonant frequency of the antenna element.
Claims23
An antenna apparatus comprising:
- an antenna element connected to a feeding point;
- a first lumped constant element;
- a second lumped constant element;
- a third lumped constant element;
- and
- a selector,
- wherein
- the first lumped constant element comprises a first end and a second end, the first end connected to the antenna element, and the second end grounded,
- the second lumped constant element and the third lumped constant element are grounded,
- the second lumped constant element and the third lumped constant element are selectively connected to the antenna element through the selector,
- a resonant frequency of the antenna element is lowered when the second lumped constant element is connected to the antenna element, and
- a resonant frequency of the antenna element is raised when the third lumped constant element is connected to the antenna element.
A communication apparatus comprising:
- an antenna apparatus comprising an antenna element connected to a feeding point, a first lumped constant element, a second lumped constant element, a third lumped constant element and a selector;
- a wireless module configured to up-convert a baseband transmission signal to a wireless transmission signal to be transmitted from the antenna apparatus, and to down-convert a wireless reception signal received by the antenna apparatus to a baseband reception signal;
- and
- a signal processor configured to process the baseband transmission signal and the baseband reception signal,
- wherein
- the first lumped constant element comprises a first end and a second end, the first end connected to the antenna element, and the second end grounded,
- the second lumped constant element and the third lumped constant element are grounded,
- the second lumped constant element and the third lumped constant element are selectively connected to the antenna element through the selector,
- a resonant frequency of the antenna element is lowered when the second lumped constant element is connected to the antenna element, and
- a resonant frequency of the antenna element is raised when the third lumped constant element is connected to the antenna element.
An antenna apparatus comprising:
- an antenna element connected to a feeding point;
- a first element;
- a second element;
- a third element;
- and
- a selector,
- wherein
- the first element comprises a first end and a second end, the first end connected to the antenna element, and the second end grounded,
- the second element and the third element are grounded,
- the second element and the third element are selectively connected to the antenna element through the selector,
- a resonant frequency of the antenna element is lowered when the second element is connected to the antenna element, and
- a resonant frequency of the antenna element is raised when the third element is connected to the antenna element.
Dependencies are inferred from the claim text.