Back to results
US 8,711,051 B2Granted
Antenna device and wireless communication apparatus
AssigneeFujitsu Limited
InventorTakashi Yamagajo
Life of this patent
Estimating the term…
Abstract
An antenna device includes a feed element being of a length that allows resonance in a specified frequency band, a distributed constant feed line grounded at one end and coupled at another end to the feed element to form a feeding point, a reactive element grounded at one end and coupled at another end to a position a specified distance from the feeding point of the feed line, a first switch disposed between the feed line and the reactive element and used to select whether the feed line and the reactive element are coupled or uncoupled, a parasitic element disposed adjacent to the feed element and being of a length that allows resonance in a frequency band different from the frequency band in which the feed element resonates, and a second switch used to select whether the parasitic element is grounded.
Claims15
An antenna device comprising:
- a feed element being of a length that allows resonance in a specified frequency band;
- a distributed constant feed line grounded at one end and coupled at another end to the feed element to form a feeding point;
- a reactive element grounded at one end and coupled at another end to a position a specified distance from the feeding point of the feed line;
- a first switch disposed between the feed line and the reactive element and used to select whether the feed line and the reactive element are coupled or uncoupled;
- a parasitic element disposed adjacent to the feed element and being of a length that allows resonance in a frequency band different from the frequency band in which the feed element resonates;
- and
- a second switch used to select whether the parasitic element is grounded,
- the first switch and the second switch being controlled to be in a uncoupled state in a case of transmitting and receiving a signal in a first frequency band, the first switch being controlled to be in a coupled state in a case of transmitting and receiving a signal in a second frequency band, and the second switch being controlled to be in a coupled state in a case of transmitting and receiving a signal in a third frequency band.
5 more elements
A wireless communication apparatus comprising:
- an antenna device including
- a feed element being of a length that allows resonance in a specified frequency band;
- a distributed constant feed line grounded at one end and coupled at another end to the feed element to form a feeding point;
- a reactive element grounded at one end and coupled at another end to a position a specified distance from the feeding point of the feed line;
- a first switch disposed between the feed line and the reactive element and used to select whether the feed line and the reactive element are coupled or uncoupled;
- a parasitic element disposed adjacent to the feed element and being of a length that allows resonance in a frequency band different from the frequency band in which the feed element resonates;
- and
- a second switch used to select whether the parasitic element is grounded;
- and
- a controller that causes the first switch and the second switch to be in a uncoupled state in a case of transmitting and receiving a signal in a first frequency band, causes the first switch to be in a coupled state in a case of transmitting and receiving a signal in a second frequency band, and causes the second switch to be in a coupled state in a case of transmitting and receiving a signal in a third frequency band.
7 more elements
An antenna device comprising:
- a feed element being of a length that allows resonance in a specified frequency band;
- a distributed constant feed line grounded at one end and coupled at another end to the feed element to form a feeding point;
- a reactive element grounded at one end and coupled at another end to a position a specified distance from the feeding point of the feed line;
- a first switch disposed between the feed line and the reactive element and used to select whether the feed line and the reactive element are coupled or uncoupled;
- a parasitic element disposed adjacent to the feed element and being of a length that allows resonance in a frequency band different from the frequency band in which the feed element resonates;
- and
- a second switch used to select whether the parasitic element is grounded, wherein
- the feed element includes a first portion and a second portion that allows resonance in a frequency band lower than a frequency band in which the first portion allows resonance,
- the antenna device is operated in a first frequency band, when the first switch causes the feed line and the reactive element to be uncoupled and the second switch causes the parasitic element to be ungrounded,
- the antenna device is operated in a second frequency band, when the first switch causes the feed line and the reactive element to be coupled and causes the first portion to be in a resonance state,
- the antenna device is operated in a third frequency band, when the first switch causes the feed line and the reactive element to be coupled and causes the second portion to be in a resonance state, and
- the antenna device is operated in a fourth frequency band, when the first switch causes the feed line and the reactive element to be coupled, the fourth frequency band being lower than the first frequency band and the second frequency band and higher than the third frequency band.
9 more elements
A wireless communication apparatus comprising:
- an antenna device including
- a feed element being of a length that allows resonance in a specified frequency band;
- a distributed constant feed line grounded at one end and coupled at another end to the feed element to form a feeding point;
- a reactive element grounded at one end and coupled at another end to a position a specified distance from the feeding point of the feed line;
- a first switch disposed between the feed line and the reactive element and used to select whether the feed line and the reactive element are coupled or uncoupled;
- a parasitic element disposed adjacent to the feed element and being of a length that allows resonance in a frequency band different from the frequency band in which the feed element resonates;
- and
- a second switch used to select whether the parasitic element is grounded, the feed element including a first portion and a second portion that allows resonance in a frequency band lower than a frequency band in which the first portion allows resonance;
- and
- a controller that
- causes the first switch and the second switch to be in a uncoupled state in a case of transmitting and receiving a signal in a first frequency band,
- causes the first switch to be in a coupled state and the first portion to be in a resonance state in a case of transmitting and receiving a signal in a second frequency band, and
- causes the first switch to be in a coupled state and the second portion to be in a resonance state in a case of transmitting and receiving a signal in a third frequency band, and
- causes the second switch to be in a coupled state in a case of transmitting and receiving a signal in a fourth frequency band, the fourth frequency band being lower than the first frequency band and the second frequency band and higher than the third frequency band.
11 more elements
Dependencies are inferred from the claim text.