ANTENNA DEVICE

• US 20110279348A1
• Filed: 03/31/2011
• Published: 11/17/2011
• Est. Priority Date: 05/12/2010
• Status: Abandoned Application

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: HOSSAIN, Golam Sorwar, Yamagajo, Takashi
• Application Number:
  US13/076,710
• Publication Number:
  US 20110279348A1
• Time in Patent Office: Days
• US Class Current: 343/895
• CPC Class Codes: H01Q 9/27 Spiral antennas
• CPC Class Codes: H01Q 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Abstract

An antenna device includes an antenna element having an external form shaped into a substantially rectangular-shaped planar spiral coil and a switch provided to the antenna element.

Claims

1. An antenna device comprising:

an antenna element having an external form shaped into a substantially rectangular-shaped planar spiral coil; and

a first switch coupled to the antenna element.

2. The antenna device according to claim 1, wherein:

the antenna element has a first end located on a vertex of the rectangular-shaped planar spiral coil and a second end located on a middle portion of the antenna element; and

the first end of the antenna element is fixed to a printed board in such a way that each of two portions of the antenna element located individually on two sides including the vertex crosses a straight fringe of the printed board at an angle θ

.

3. The antenna device according to claim 2, wherein the angle θ

is between 30 and 60 degrees.

4. The antenna device according to claim 1, further comprising extra second switch which can be turned on or off separately from the first switch.

5. The antenna device according to claim 1, further comprising a line which supplies the first switch with an on-off signal, the line being located in a direction perpendicular to a straight portion of the antenna element.