PLANAR ANTENNA

• US 20080106473A1
• Filed: 12/22/2006
• Published: 05/08/2008
• Est. Priority Date: 11/03/2006
• Status: Active Grant

• Current Assignee: Cloud Network Technology Singapore Pte. Ltd. (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Hon Hai Precision Industry Co., Ltd.
• Inventors: CHUNG, CHO-JU, CHU, TENG-HUEI
• Granted Patent: US 7,385,556 B2
• Time in Patent Office: Days
• US Class Current: 343/700MS
• 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 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Abstract

A planar antenna (20) disposed on a substrate (10) including a first surface (102) and a second surface (104). The planar antenna includes a radiating body (21) laid on the first surface for transmitting and receiving radio frequency (RF) signals, a feeding portion (22), and a first metallic ground plane (24) laid on the second surface. The radiating body includes a first radiating portion (212) and a second radiating portion (214). The first radiating portion includes an open end (2122), and a connecting portion (2124). The second radiating portion includes a free end (2144) and an end (2146) connected to the connecting portion. A first gap (26) is formed between the open end and the free end. The feeding portion is laid on the first surface and electrically connected to the connecting portion. The first ground plane is electrically connected to the second radiating portion through a via (23).

Claims

1. A planar antenna disposed on a substrate comprising a first surface and a second surface, the planar antenna comprising:

a feeding portion laid on the first surface for feeding signals to the antenna;

a radiating body laid on the first surface for transmitting and receiving radio frequency (RF) signals, the radiating body comprising a meandering first radiating portion extending away from the feeding portion and a second radiating portion extending away from the feeding portion next to the first radiating portion, the first radiating portion comprising an open end disposed at an extending end thereof to point toward the second radiating portion and a connecting portion disposed at another end thereof, the second radiating portion comprising a free end disposed at an extending end of the second radiating portion to point toward the first meandering radiating portion and an end connected to the connecting portion, a first gap formed between the open end of the first radiating portion and the free end of the second radiating portion, and the open end, the first gap and the free end being aligned with one another;

a first metallic ground plane, laid on the second surface of the substrate, the first ground plane electrically connected to the second radiating portion through a via.

2. The planar antenna as claimed in claim 1, wherein the second radiating portion is generally L-shaped.

3. The planar antenna as claimed in claim 2, wherein the second radiating portion comprises a short portion located in a right-angled corner thereof.

4. The planar antenna as claimed in claim 2, wherein a length of the route of the electromagnetic wave from the open end to the short portion is generally equal to a fourth of the working wavelength of the planar antenna.

5. The planar antenna as claimed in claim 1, further comprising a second metallic ground plane laid on the first surface of the substrate.

6. The planar antenna as claimed in claim 5, wherein a second gap is formed among the second radiating portion, the feeding portion, and the second ground plane.

7-12. -12. (canceled)

13. An assembly comprising:

a substrate; and

an antenna disposed on said substrate, and comprising a feeding portion for feeding signals to said antenna, a radiating body electrically connectable with said feeding portion to transmit and receive radio frequency (RF) signals for said antenna, said radiating body comprising a first radiating portion extending away from said feeding portion and a second radiating portion extending away from said feeding portion next to said first radiating portion, said first radiating portion comprising an open end disposed at an extending end of said first radiating portion to point toward said second radiating portion, said second radiating portion comprising a free end disposed at an extending end of said second radiating portion to point toward said first radiating portion, a gap formed between said open end of said first radiating portion and said free end of said second radiating portion, and said open end, said gap and said free end being aligned with one another.

14. The assembly as claimed in claim 13, further comprising a metallic ground plane disposed on said substrate opposite to said antenna, said ground plane electrically connectable with said second radiating portion through a via.

15. The assembly as claimed in claim 13, wherein said second radiating portion is generally L-shaped.

16. The assembly as claimed in claim 13, wherein said second radiating portion comprises a short portion located in a right-angled corner thereof.

17. The assembly as claimed in claim 13, wherein a second gap is formed among said second radiating portion, said feeding portion, and a metallic ground plane formed on the same surface of said substrate as said radiating body.

18. An assembly comprising:

a substrate comprising a first surface and a second surface opposite to said first surface; and

an antenna disposed on said substrate, and comprising a feeding portion on said first surface for feeding signals to said antenna, a radiating body on said first surface electrically connectable with said feeding portion to transmit and receive radio frequency (RF) signals for said antenna, said radiating body comprising a first radiating portion extending away from said feeding portion and a second radiating portion extending away from said feeding portion next to said first radiating portion, said first radiating portion comprising an open end disposed at an extending end of said first radiating portion, said second radiating portion comprising a free end disposed at an extending end of said second radiating portion, a metallic ground plane disposed on said second surface of said substrate, said ground plane electrically connectable with said second radiating portion through a via, and said open end, said free end and said via being aligned with one another.

19. The assembly as claimed in claim 18, wherein said open end of said first radiating portion is disposed to point toward said second radiating portion, and said free end of said second radiating portion is disposed to point toward said first radiating portion.

20. The assembly as claimed in claim 19, wherein said open end of said first radiating portion and said free end of said second radiating portion are disposed to point toward each other.

21. The assembly as claimed in claim 18, further comprising a gap formed between said open end of said first radiating portion and said free end of said second radiating portion to align with said open end, said free end and said via.

22. The assembly as claimed in claim 18, wherein said second radiating portion is generally L-shaped.

23. The assembly as claimed in claim 18, wherein said second radiating portion comprises a short portion located in a right-angled corner thereof.

24. The assembly as claimed in claim 18, wherein a second gap is formed among said second radiating portion, said feeding portion, and another metallic ground plane formed on said first surface.