Dual band antenna

• US 20050007279A1
• Filed: 06/07/2004
• Published: 01/13/2005
• Est. Priority Date: 06/24/2003
• Status: Active Grant

• Current Assignee: BenQ Corporation (Qisda Corporation)
• Original Assignee: BenQ Corporation (Qisda Corporation)
• Inventors: Chang, Chun Yi
• Granted Patent: US 7,245,260 B2
• Time in Patent Office: Days
• US Class Current: 343/700.MS
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 1/38 formed by a conductive layer on an insulating support patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142
• CPC Class Codes: H01Q 5/357 using a single feed point
• CPC Class Codes: H01Q 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Abstract

A dual band antenna includes a metal strip and a feeding leg. The metal strip formed on a substrate further comprises a first band portion and a second band portion, in which a tail of the first band portion is connected to the second band portion. The feeding leg extended from a head of the first band portion is led to connect with a signal processing circuit. The metal strip can be tuned to second frequency band signals, in which the first band portion is purposely tuned to first frequency band signals. Also, the second band portion has a function of adjusting frequencies of the second frequency band.

Claims

1. A dual band antenna for a communication device to transmit/receive radio signals, comprising:

a metal strip, formed on a substrate, further comprising a first band portion and a second band portion wherein a tail of said first band portion is connected to said second band portion; and

a feeding leg, extended from a head of said first band portion so as to connect with a signal processing circuit;

wherein said first band portion is tuned for said communication device receiving signals within a first frequency band, said metal strip is tuned for the communication device receiving signals within a second frequency band, and said second band portion adjusting frequencies of said second frequency band.

2. The dual band antenna of claim 1, wherein frequencies of said first frequency band are lower than the frequencies of said second frequency band.

3. The dual band antenna of claim 1, wherein said substrate further includes a first surface and a second surface.

4. The dual band antenna of claim 3, wherein said first band portion and said second band portion are mounted on said first surface.

5. The dual band antenna of claim 3, wherein said first band portion is formed on said first surface, said second band portion is formed on said second surface, and said first band portion is electrically connected to said second band portion through a conductive aperture of said substrate.

6. The dual band antenna of claim 1, wherein said first band portion is resonant at frequencies in said first frequency band and in said second frequency band.

7. The dual band antenna of claim 6, wherein said “

adjusting frequencies of said second frequency band”

is to lower the frequencies of said second frequency band.

8. The dual band antenna of claim 1, wherein said first band portion is shaped in L-like and a short part of said first band portion is connected to said second band portion.

9. The dual band antenna of claim 1, wherein said second band portion is shaped in L-like and a long part of said second band portion is connected to said first band portion.

10. A communication device provided to transmit/receive dual band radio signals, comprising:

an antenna; and

a signal processing circuit, provided for selectively processing a first frequency band signals and a second frequency band signals through said antenna;

wherein said antenna further comprises;

a metal strip, formed on a substrate, comprising a first band portion and a second band portion wherein a tail of said first band portion is connected to said second band portion; and

a feeding leg, extended from a head of said first band portion so as to connect with said signal processing circuit;

wherein said first band portion is tuned for receiving signals within said first frequency band, said metal strip is tuned for receiving signals within said second frequency band, and said second band portion adjusting frequencies of said second frequency band.

11. The communication device according to claim 10, wherein frequencies of said first frequency band are lower than the frequencies of said second frequency band.

12. The communication device according to claim 10, wherein said substrate further includes a first surface and a second surface.

13. The communication device according to claim 12, wherein said first band portion and said second band portion are mounted on said first surface.

14. The communication device according to claim 12, wherein said first band portion is formed on said first surface, said second band portion is formed on said second surface, and said first band portion is electrically connected to said second band portion through a conductive aperture of said substrate.

15. The communication device according to claim 10, wherein said first band portion is resonant at frequencies in said first frequency band and in said second frequency band.

16. The communication device according to claim 15, wherein said “

adjusting frequencies of said second frequency band”

is to lower the frequencies of said second frequency band.

17. The communication device according to claim 10, wherein said first band portion is shaped in L-like and a short part of said first band portion is connected to said second band portion.

18. The communication device according to claim 10, wherein said second band portion is shaped in L-like and a long part of said second band portion is connected to said first band portion.