Broadband antenna

• US 20090184878A1
• Filed: 06/03/2008
• Published: 07/23/2009
• Est. Priority Date: 01/18/2008
• Status: Active Grant

• Current Assignee: Lite-On Electronics Company Limited (Lite-On Technology Corporation)
• Original Assignee: Lite-On Technology Corporation, Silitek Electronic Company Limited (Lite-On Technology Corporation)
• Inventors: Lai, Po-Chih
• Granted Patent: US 7,965,253 B2
• Time in Patent Office: Days
• US Class Current: 343/845
• 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 9/0442 with particular tuning means
• CPC Class Codes: H01Q 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Abstract

A broadband antenna including an antenna body, a ground plane, and a bandwidth adjustment portion is described. The bandwidth adjustment portion, formed by at least one capacitor, is connected between the antenna body and the ground plane. The bandwidth adjustment portion is formed by more than one capacitor connected in series. Also, in another situation, the bandwidth adjustment portion can be formed by more than one capacitor connected in parallel.

Claims

1. A broadband antenna, comprising:

an antenna body, formed by a first conductor, a second conductor, and a third conductor, wherein the second conductor has a first end connected to the first conductor, and the third conductor has a first end connected to the first conductor;

a feed-in point, connected to a second end of the second conductor;

a ground plane, connected to a second end of the third conductor; and

a bandwidth adjustment portion, connected between a predetermined position of the third conductor and the ground plane.

2. The broadband antenna according to claim 1, wherein the bandwidth adjustment portion is formed by at least one capacitor.

3. The broadband antenna according to claim 2, wherein the bandwidth adjustment portion comprises two capacitors connected in series.

4. The broadband antenna according to claim 1, wherein the second conductor and the third conductor are approximately disposed in parallel.

5. The broadband antenna according to claim 1, wherein the second conductor and the third conductor are disposed perpendicular to the first conductor.

6. The broadband antenna according to claim 1, wherein the antenna body, the ground plane, the feed-in point, and the bandwidth adjustment portion are disposed on a surface of a substrate.

7. The broadband antenna according to claim 6, further comprising another ground plane disposed on another surface of the substrate.

8. A broadband antenna, comprising:

an antenna body, formed by a first conductor and a second conductor, wherein a first end of the second conductor is connected to a first end of the first conductor, and both second ends of the first conductor and the second conductor are open;

a feed-in point, electrically connected to the first end of the first conductor;

a ground plane; and

a bandwidth adjustment portion, connected to the second conductor and the ground plane.

9. The broadband antenna according to claim 8, wherein the bandwidth adjustment portion is formed by at least one capacitor.

10. The broadband antenna according to claim 9, wherein the bandwidth adjustment portion comprises two capacitors connected in parallel.

11. The broadband antenna according to claim 8, wherein the first conductor is presented as a serpentine metal wire.

12. The broadband antenna according to claim 8, wherein the antenna body, the ground plane, the feed-in point, and the bandwidth adjustment portion are disposed on a surface of a substrate.

13. The broadband antenna according to claim 12, further comprising another ground plane disposed on another surface of the substrate.