Antenna device and signal receiving method

• US 20090058758A1
• Filed: 08/19/2008
• Published: 03/05/2009
• Est. Priority Date: 08/29/2007
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Ito, Takayoshi, Nishio, Masaki
• Granted Patent: US 8,035,571 B2
• Time in Patent Office: Days
• US Class Current: 343/893
• CPC Class Codes: H01Q 1/2266 disposed inside the computer
• CPC Class Codes: H01Q 21/293 one unit or more being an array of identical aerial elements adaptive arrays H01Q3/2605
• CPC Class Codes: H01Q 25/00 Antennas or antenna systems providing at least two radiating patterns arrangements for changing or varying the orientation or the shape of the directional pattern H01Q3/00
• CPC Class Codes: H01Q 9/0421 with a shorting wall or a shorting pin at one end of the element H01Q9/0414 takes precedence
• CPC Class Codes: H01Q 9/30 with feed to end of elongated active element, e.g. unipole H01Q9/44 takes precedence
• CPC Class Codes: H04B 1/126 having multiple inputs, e.g. auxiliary antenna for receiving interfering signal aerials in general H01Q

Abstract

There is provided with an antenna device, including: a conductive ground plane; first and second antenna elements connected to the conductive ground plane through first and second feeding points, respectively, directivities of the first and second antenna elements being arranged to be approximately perpendicular to each other; a phase adjusting circuit configured to provide a phase difference of approximately 180 degrees between first and second received signals by the first and second antenna elements, respectively; a combining circuit configured to combine the first and second received signals having a phase difference of approximately 180 degrees therebetween to obtain a combined signal; and a radio unit configured to process the combined signal.

Claims

1. An antenna device, comprising:

a conductive ground plane;

first and second antenna elements connected to the conductive ground plane through first and second feeding points, respectively, directivities of the first and second antenna elements being arranged to be approximately perpendicular to each other;

a phase adjusting circuit configured to provide a phase difference of approximately 180 degrees between first and second received signals by the first and second antenna elements, respectively;

a combining circuit configured to combine the first and second received signals having a phase difference of approximately 180 degrees therebetween to obtain a combined signal; and

a radio unit configured to process the combined signal.

2. The device according to claim 1, wherein the first and second antenna elements are arranged to be approximately parallel to the conductive ground plane, and to be kept approximately perpendicular to each other.

3. The device according to claim 1, wherein

the first and second feeding points are provided on adjacent edge sides of the conductive ground plane.

4. The device according to claim 1, wherein

a distance between the first and second feeding points is equal to or smaller than a quarter of an operating wavelength.

5. The device according to claim 1, wherein

each of the first and second antenna elements has a first partial element parallel to the conductive ground plane, and a second partial element approximately perpendicular to the conductive ground plane,

one end of each second partial element is connected to one end of each first partial element, and

the other end of the each second partial element is connected to each of the first and second feeding points, respectively.

6. The device according to claim 5, wherein

the each first partial element is angled to be approximately parallel to the conductive ground plane, and

an open end of the each first partial element angled is adjacent to each other.

7. The device according to claim 6, wherein

the first and second antenna elements have a length of approximately a quarter of an operating wavelength.

8. The device according to claim 5, wherein

the each first partial element is angled toward the conductive ground plane and

an open end of the each first partial element angled is short-circuited to the conductive ground plane.

9. The device according to claim 8, wherein

the first and second antenna elements have a length of approximately a half of an operating wavelength.

10. The device according to claim 1, wherein

the first and second antenna elements are arranged along adjacent edge sides of the conductive ground plane, respectively.

11. A signal receiving method, comprising:

receiving first and second signals by first and second antenna elements connected to a conductive ground plane through first and second feeding points, respectively, wherein directivities of the first and second antenna elements are arranged to be approximately perpendicular to each other;

creating a phase difference of approximately 180 degrees between first and second received signals;

combine the first and second received signals having the phase difference of approximately 180 degrees therebetween to obtain a combined signal; and

processing the combined signal.