Multi-frequency antenna for a portable electronic apparatus

• US 20040239579A1
• Filed: 12/30/2003
• Published: 12/02/2004
• Est. Priority Date: 05/27/2003
• Status: Active Grant

• Current Assignee: Quanta Computer
• Original Assignee: Quanta Computer
• Inventors: Shih, Kai, Tsai, Tiao-Hsing, Peng, Huang-Tse, Chiu, Chien-Pin
• Granted Patent: US 6,919,860 B2
• Time in Patent Office: Days
• US Class Current: 343/895
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 1/36 Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewithH01Q1/08, H01Q1/14 take precedence
• 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 7/00 Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop

Abstract

A multi-frequency antenna includes a first antenna element having a first antenna member for receiving and transmitting signals in a first frequency band and a second antenna member for receiving and transmitting signals in a second frequency band. The first antenna member has opposite first and second ends. The second antenna member has opposite third and fourth ends respectively disposed adjacent to and remote from the first end of the first antenna member. The fourth end of the second antenna member is connected electrically to the first end of the first antenna member so as to form a feed point. A C-shaped second antenna element has opposite ends, one of which is connected electrically to the third end of the second antenna member of the first antenna element.

Claims

1. A multi-frequency antenna comprising:

a first antenna element having

a first antenna member for receiving and transmitting signals in a first frequency band, said first antenna member having opposite first and second ends, and

a second antenna member for receiving and transmitting signals in a second frequency band, said second antenna member having opposite third and fourth ends respectively disposed adjacent to and remote from said first end of said first antenna member, said fourth end of said second antenna member being connected electrically to said first end of said first antenna member so as to form a feed point at a junction of said fourth end of said second antenna member and said first end of said first antenna member; and

a C-shaped second antenna element having opposite ends, one of which is connected electrically to said third end of said second antenna member of said first antenna element.

2. The multi-frequency antenna as claimed in claim 1, wherein said first and second antenna elements are disposed in a common plane.

3. The multi-frequency antenna as claimed in claim 1, wherein said first antenna member of said first antenna element is surrounded by said second antenna element.

4. The multi-frequency antenna as claimed in claim 1, wherein at least one of said first and second antenna members has a serpentine configuration.

5. The multi-frequency antenna as claimed in claim 1, wherein at least one of said first and second antenna members has a helical configuration.