IP Library › Granted Patent US 8,471,777
Granted Patent B2
US 8,471,777 · App. 12/906,400 · Granted Jun 25, 2013

Antenna apparatus

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Quick Facts
Patent No.
US 8,471,777
App. No.
12/906,400
Granted
Jun 25, 2013
Kind
B2
Abstract

An antenna apparatus comprises a planar monopole antenna device and an extending layer. The planar monopole antenna device includes an electromagnetic shielding box. The extending layer is composed of electric conducting material and extends outward from a feed point of the electromagnetic shielding box.

Claims (28)

1. An antenna apparatus, comprising:

a planar monopole antenna device including an electromagnetic shielding box; and

an extending layer composed of electrical conducting material and extending outward from a feed point of the electromagnetic shielding box,

wherein the extending layer covers at least a portion of an outer surface of the electromagnetic shielding box.

2. The antenna apparatus of claim 1 , wherein the extending layer extends in a direction parallel to the electromagnetic shielding box.

3. The antenna apparatus of claim 1 , wherein a cavity is formed between the extending layer and the electromagnetic shielding box.

4. The antenna apparatus of claim 1 , wherein a cavity is formed between the extending layer and the top of the electromagnetic shielding box, and another cavity is formed between the extending layer and the bottom of the electromagnetic shielding box.

5. The antenna apparatus of claim 1 , which exhibits characteristics of a dipole antenna such that the extending layer serves as a ground of the dipole antenna.

6. The antenna apparatus of claim 1 , wherein the length of the extending layer equals one quarter of the wavelength of the electromagnetic wave emitted by the antenna apparatus, and the end of the extending layer opposing the feed point and the electromagnetic shielding box form an open circuit.

7. The antenna apparatus of claim 1 , wherein the length of the extending layer equals one half of the wavelength of the electromagnetic wave emitted by the antenna apparatus, and the end of the extending layer opposing the feed point and the electromagnetic shielding box form a close circuit.

8. The antenna apparatus of claim 1 , which is configured to be operated in an ultra high frequency band.

9. An antenna apparatus, comprising:

a printed circuit board comprising a radio frequency circuit;

an antenna end connected to the printed circuit board;

an electromagnetic shielding box covering the printed circuit board; and

an extending layer composed of electrical conducting material and extending outward from a feed point of the electromagnetic shielding box,

wherein the extending layer covers at least a portion of an outer surface of the electromagnetic shielding box.

10. The antenna apparatus of claim 9 , wherein the extending layer extends in a direction parallel to the electromagnetic shielding box.

11. The antenna apparatus of claim 9 , wherein a cavity is formed between the extending layer and the electromagnetic shielding, box.

12. The antenna apparatus of claim 9 , wherein a cavity is formed between the extending layer and the top of the electromagnetic shielding box, and another cavity is formed between the extending layer and the bottom of the electromagnetic shielding box.

13. The antenna apparatus of claim 9 , wherein the extending layer is rectangular from a top view.

14. The antenna apparatus of claim 9 , which exhibits characteristics of a dipole antenna such that the extending layer serves as a ground of the dipole antenna, and the antenna end serves as a signal source of a dipole antenna.

15. The antenna apparatus of claim 9 , wherein the length of the extending layer equals one quarter of the wavelength of the electromagnetic wave emitted by the antenna apparatus, and the end of the extending layer opposing the feed point and the electromagnetic shielding box form an open circuit.

16. The antenna apparatus of claim 9 , wherein the length of the extending layer equals one half of the wavelength of the electromagnetic wave emitted by the antenna apparatus, and the end of the extending layer opposing the feed point and the electromagnetic shielding box form a close circuit.

17. The antenna apparatus of claim 9 , wherein the antenna end comprises a bent metal antenna.

18. The antenna apparatus of claim 17 , wherein the length of the extending layer is greater than the length of the metal antenna.

19. The antenna apparatus of claim 17 , wherein the length of the metal antenna equals one quarter of the wavelength of the electromagnetic wave emitted by the antenna apparatus.

20. The antenna apparatus of claim 9 , wherein the antenna end comprises a printed metal antenna on a board.

Assignments (2)
MERGER Recorded Sep 19, 2014
From: RALINK TECHNOLOGY CORPORATION
To: MEDIATEK INC.
Reel/Frame 033781/0192 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Oct 18, 2010
From: LIN, JUNN YI; CHEN, XIN CHANG
To: RALINK TECHNOLOGY CORPORATION
Reel/Frame 025153/0585 →