Multi-band antenna with inductor and/or capacitor
AssigneeYokowo Co., Ltd.
InventorsTadashi Oshiyama, Hirotoshi Mizuno, Yusuke Suzuki
Life of this patent
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Abstract
A multi-band antenna is adapted to operate in a first frequency band and a second frequency band which is lower than the first frequency band. In the multi-band antenna, an antenna element has an electrical length of ¾ wavelength of the first frequency band. The antenna element has a first end adapted to be electrically connected to a power feeding point, and a second end. An inductor is electrically connected between the second end of the antenna element and a ground in a serial manner. The inductor has such an inductance that an electrical length of the antenna element and the inductor corresponds to ½ wavelength of the second frequency band.
Claims8
A multi-band antenna, adapted to operate in a first frequency band and a second frequency band which is lower than the first frequency band, the multi-band antenna comprising:
- an antenna element comprising;
- a first end, adapted to be electrically connected to a power feeding point;
- and
- a second end;
- and
- a circuit, electrically connected between the second end of the antenna element and a ground in a serial manner, wherein:
- the antenna element is configured to serve as an antenna only in the first frequency when the second end is not electrically connected to the circuit, and
- the antenna element is configured to serve as an antenna in both the first and the second frequencies when the second end is electrically grounded through the circuit, wherein:
- the antenna element has an electrical length of ¾ wavelength of the first frequency band;
- the circuit includes an inductor;
- and
- the inductor has such an inductance that an electrical length of the antenna element and the inductor corresponds to ½ wavelength of the second frequency band.
A multi-band antenna, adapted to operate in a first frequency band and a second frequency band which is lower than the first frequency band, the multi-band antenna comprising:
- an antenna element comprising;
- a first end, adapted to be electrically connected to a power feeding point;
- and
- a second end;
- and
- a circuit, electrically connected between the second end of the antenna element and a ground in a serial manner, wherein:
- the antenna element is configured to serve as an antenna only in the first frequency when the second end is not electrically connected to the circuit, and
- the antenna element is configured to serve as an antenna in both the first and the second frequencies when the second end is electrically grounded through the circuit, wherein:
- the multi-band antenna is adapted to operate in a third frequency band which is lower than the second frequency band;
- the antenna element has an electrical length of ¾ wavelength of the second frequency band;
- the circuit includes an inductor and a capacitor which are electrically connected in a parallel manner;
- the capacitor has such a capacitance that an electrical length of the antenna element and the capacitor corresponds to ½ wavelength of the first frequency band;
- and
- the inductor has such an inductance that an electrical length of the antenna element and the inductor corresponds to ½ wavelength of the third frequency band.
A multi-band antenna, adapted to operate in a first frequency band and a second frequency band which is lower than the first frequency band, the multi-band antenna comprising:
- an antenna element comprising;
- a first end, adapted to be electrically connected to a power feeding point;
- and
- a second end;
- and
- a circuit, electrically connected between the second end of the antenna element and a ground in a serial manner, wherein:
- the antenna element is configured to serve as an antenna only in the first frequency when the second end is not electrically connected to the circuit, and
- the antenna element is configured to serve as an antenna in both the first and the second frequencies when the second end is electrically grounded through the circuit, wherein:
- the antenna element has an electrical length of ½ wavelength of the first frequency band and ¼ wavelength of the second frequency band;
- the circuit includes a first inductor and a parallel circuit including a second inductor and a capacitor which are electrically connected in a parallel manner;
- the parallel circuit is so configured as to parallel-resonate with the first frequency band;
- and
- the first inductor and the capacitor are so configured as to serial-resonate with the second frequency band.
A multi-band antenna, adapted to operate in a first frequency band and a second frequency band which is lower than the first frequency band, the multi-band antenna comprising:
- an antenna element comprising;
- a first end, adapted to be electrically connected to a power feeding point;
- and
- a second end;
- and
- a circuit, electrically connected between the second end of the antenna element and a ground in a serial manner, wherein:
- the antenna element is configured to serve as an antenna only in the first frequency when the second end is not electrically connected to the circuit, and
- the antenna element is configured to serve as an antenna in both the first and the second frequencies when the second end is electrically grounded through the circuit, wherein:
- the antenna element has an electrical length of ¾ wavelength of the first frequency band and ½ wavelength of the second frequency band;
- the circuit includes a first capacitor and a parallel circuit including an inductor and a second capacitor which are electrically connected in a parallel manner;
- the parallel circuit is so configured as to parallel-resonate with the first frequency band;
- and
- the inductor and the second capacitor are so configured as to serial-resonate with the second frequency band.
Dependencies are inferred from the claim text.