Multi-frequency band antenna

• US 20020089453A1
• Filed: 01/10/2001
• Published: 07/11/2002
• Est. Priority Date: 01/10/2001
• Status: Active Grant

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Tseng, Wen-Jen, Sheen, Jyh-Wen
• Granted Patent: US 6,459,413 B1
• Time in Patent Office: Days
• US Class Current: 343/702
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 1/362 for broadside radiating helical 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 21/30 Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
• CPC Class Codes: H01Q 5/371 Branching current paths
• CPC Class Codes: H01Q 5/40 Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements
• CPC Class Codes: H01Q 9/30 with feed to end of elongated active element, e.g. unipole H01Q9/44 takes precedence

Abstract

An antenna operable in multiple frequency bands used in a personal wireless communication device comprises a first radiating element, a second radiating element, and a feed radiating element. The first radiating element is shaped as an extended bent wire to function as an antenna for a first frequency band. The second radiating element functions as an antenna for a second frequency band. The feed radiating element has at least two ends. One end is used as a signal feed point so that first and second frequency signals can share the same signal feed point. The other end electrically connects the first radiating element to the second radiating element and forms a top loaded structure. The extended bent wire antenna effectively reduces the overall length of the antenna.

Claims

1. An multi-frequency band antenna comprising:

a first radiating element being shaped as an extended bent wire for functioning as an antenna element of a first frequency band, said first radiating element comprising a conductive material;

a second radiating element for functioning as an antenna element of a second frequency band, said second frequency band being different from said first frequency band, said second radiating element comprising a conductive material; and

a feed radiating element having a first end being used as a signal feed point for signals of said first and second frequency bands, and a second end being electrically connecting said first radiating element to said second radiating element and forming a top loaded structure.

2. The multi-frequency band antenna as claimed in claim 1, said feed radiating element being a metal conductor.

3. The multi-frequency band antenna as claimed in claim 1, said feed radiating element being formed by a metal conductor and a base of a dielectric material.

4. The multi-frequency band antenna as claimed in claim 3, said metal conductor being placed on a top surface of said base.

5. The multi-frequency band antenna as claimed in claim 3, said metal conductor being placed on an interior layer of said base.

6. The multi-frequency band antenna as claimed in claim 1, said first and second radiating elements being formed by two metal conductors and a base of a dielectric material.

7. The multi-frequency band antenna as claimed in claim 6, said metal conductors being placed on a top surface of said base.

8. The multi-frequency band antenna as claimed in claim 6, said metal conductors being placed in an interior area of said base.

9. The multi-frequency band antenna as claimed in claim 6, said base having at least two interior layers and said metal conductors being placed in different interior layers.

10. The multi-frequency band antenna as claimed in claim 1, said first and said second radiating elements being coplanar and forming an angle with said feed radiating element.

11. The multi-frequency band antenna as claimed in claim 10, said angle being in a range between 70°

to 180°

.

12. The multi-frequency band antenna as claimed in claim 1, said first and said second radiating elements being placed on a curved surface.

13. The multi-frequency band antenna as claimed in claim 1, said first radiating element having an extended square-wave pattern.

14. The multi-frequency band antenna as claimed in claim 1, said first radiating element having an extended saw-tooth pattern.

15. The multi-frequency band antenna as claimed in claim 1, said first radiating element having an extended sinusoid pattern.

16. The multi-frequency band antenna as claimed in claim 1, said first radiating element having a pattern which is a combination of at least two patterns selected from the group of extended square-wave pattern, extended saw-tooth pattern and extended sinusoid pattern.

17. The multi-frequency band antenna as claimed in claim 1, said second radiating element being a straight conductor.

18. The multi-frequency band antenna as claimed in claim 1, said second radiating element being an extended bent conductor.