Antenna device and radio apparatus
AssigneeKabushiki Kaisha Toshiba
InventorsMasaki Nishio, Yukako Tsutsumi, Takayoshi Ito
Life of this patent
Estimating the term…
Abstract
An antenna device includes an antenna element, a capacitor and a inductor. The antenna element has a length which is a quarter of a wavelength due to a first frequency. One end of the antenna element is connected to a feeding point. The other end of the antenna element is opened. The capacitor is arranged at a position having a distance which is equal or shorter than a half of a wavelength due to a second frequency from the other end of the antenna element. The inductor is arranged at a position having a distance which is equal or shorter than a quarter of the wavelength due to the second frequency from the other end of the antenna element.
Claims8
An antenna device, comprising:
- an antenna element having a length which is a quarter of a wavelength due to a first frequency, one end of the antenna element being connected to a feeding point, other end of the antenna element being opened;
- a capacitor arranged at a position having a distance which is equal or shorter than a half of a wavelength due to a second frequency from the other end of the antenna element;
- and
- an inductor arranged at a position having a distance which is equal or shorter than a quarter of the wavelength due to the second frequency from the other end of the antenna element.
A radio apparatus, comprising:
- an antenna device including
- an antenna element having a length which is a quarter of a wavelength due to a first frequency, one end of the antenna element being connected to a feeding point, other end of the antenna element being opened,
- a capacitor arranged at a position having a distance which is equal or shorter than a half of a wavelength due to a second frequency from the other end of the antenna element, and
- an inductor arranged at a position having a distance which is equal or shorter than a quarter of the wavelength due to the second frequency from the other end of the antenna element;
- a frequency convertor converting a radio signal received by the antenna device into an analog baseband signal;
- an A/D convertor converting the analog baseband signal from the frequency convertor to a digital baseband signal;
- and
- a digital signal processing circuit performing baseband signal processing for the digital baseband signal.
Dependencies are inferred from the claim text.