Multi band built-in antenna

• US 6,806,834 B2
• Filed: 08/05/2002
• Issued: 10/19/2004
• Est. Priority Date: 04/11/2002
• Status: Expired due to Fees

• Current Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Original Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Inventors: Yoon, Jong Cheol
• Primary Examiner(s): Wimer, Michael C.
• Application Number:
  US10/211,270
• Publication Number:
  US 20030193438A1
• Time in Patent Office: 806 Days
• Field of Search: 343/700.MS, 343/702, 343/346
• US Class Current: 343/702
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 5/357 using a single feed point
• CPC Class Codes: H01Q 5/371 Branching current paths
• CPC Class Codes: H01Q 9/0421 with a shorting wall or a shorting pin at one end of the element H01Q9/0414 takes precedence

Abstract

A planar inverted F antenna (PIFA) includes a feed pin supplying a current, a feed line having one end electrically coupled to one end of the feed pin and having a predetermined resonance length, a coupling pin coupled to the other end of the feed line, and a radiating patch formed on a plane spaced-apart from the feed line by a predetermined distance to induce the current supplied through the other end of the coupling pin, and a slot having one end starting at a portion of an edge and the other end disposed in an inside portion of the radiating patch, and a shorting pin having one end coupled to the radiating patch and the other end coupled to a ground. The PIFA becomes smaller by using an electrical resonance length of the feed line, a shape of the feed line, and the open stub and the matching pad, improves the flexibility of the antenna design, and obtains a wider frequency band.

Claims

1. A planar inverted F antenna, comprising:

a feed pin through which a current is directed;

a feed line having a first end coupled to the feed pin and a second end extended from the first end by a predetermined length;

a coupling pin having one end coupled to said second end of said feed line;

a radiating patch formed on a surface spaced-apart from said feed line to induce the current directed through the other end of said coupling pin, said radiating patch having a slot having one portion starting from one edge of said radiating patch and another portion extended from the one portion to be disposed in an inside of said radiating patch; and

a shorting member having one end coupled to one end of said radiating patch and the other end coupled to a ground unit.

2. The antenna of claim 1, wherein said antenna comprises a conductive body and a non-conductive body having an inside and an outside surrounded by said conductive body, said radiating patch formed on a portion of said conductive body disposed on said outside of said non-conductive body, and said feed line is disposed in said inside of said non-conductive body.

3. The antenna of claim 2, wherein said coupling pin is a perforation of said non-conductive body to couple the radiating patch and the feed line.

4. The antenna of claim 2, wherein said feed pin is made of a conductive material extended from said feed line to have a height greater than that of a side wall of said non-conductive body.

5. The antenna of claim 2, wherein said shorting member is made of a conductive material extended from said radiating patch to have a height greater than that a side wall of said non-conductive body.

6. The antenna of claim 1, wherein said feed line has a loop shape.

7. The antenna of claim 1, wherein said feed line has a meander shape.

8. The antenna of claim 1, further comprising:

a plurality of stacked dielectric layers and a conductive pattern forming said feed line, wherein said feed line formed on a surface of one of said dielectric layers comprises at least a portion formed on another surface of the one of said dielectric layers or on a surface of another one of said dielectric layers.

9. The antenna of claim 1, wherein another portion of said slot is disposed adjacent to a portion of said radiating patch supplied with the current.

10. The antenna of claim 1, wherein the one end of said shorting member coupled to a radiating patch area is disposed on the same edge as another radiating patch area coupled to said feed line.

11. The antenna of claim 1, wherein said antenna comprises an external communication terminal having a housing and a ground formed on the housing to be coupled to said shorting pin, and said antenna comprises a coupling pad coupling said shorting pin to said ground of said hosing of said communication terminal.

12. The antenna of claim 1, wherein said antenna comprises a ground unit formed on a surface facing said radiating patch and coupled to another end of said shorting member.

13. The antenna of claim 1, wherein said feed line comprises a matching pad disposed adjacent to said feed pin to adjust a resonance impedance of the feed line.

14. The antenna of claim 1, wherein said antenna comprises an open stub coupled to said feed pin and having a predetermined length in a lengthwise parallel to said feed line.

15. A planar inverted F antenna in a communication terminal having a ground, said antenna comprising:

a feed pin having a feed pad formed on one end thereof to direct a current;

a feed line having a first end coupled to said feed pin and having a second end extended from said first end by a predetermined length;

a radiating patch formed on a surface spaced-apart from said feed line to induce the current transmitted through the feed pin; and

a shorting member having one end coupled to said radiating patch, the other end coupled to the feed line, and a coupling pad disposed adjacent to the other end of the shorting member to be coupled to the ground;

wherein said radiating patch comprises;

a slot having one end starting from one edge of said radiating patch and the other end disposed in an inside area of the radiating patch, said slot dividing said radiating patch into two patch areas each having an electric resonance length corresponding to a frequency band.

16. The antenna of claim 15, wherein said feed line has a shape of a loop.

17. The antenna of claim 15, wherein said feed line has a shape of a meander.

18. The antenna of claim 15, further comprising at least two dielectric layers, wherein said feed pin, said radiating patch, and said coupling pad are formed on corresponding surfaces of said dielectric layers, and said feed line comprises a first portion formed on one of the dielectric layers and a second portion formed on the other one of said dielectric layers.

19. The antenna of claim 15, wherein the other end of said slot is disposed adjacent to a portion of said radiating patch supplied with the current.

20. The antenna of claim 15, wherein the other end of said feed pin is spaced-apart from the radiating patch and electrically coupled with said radiating patch.

21. The antenna of claim 15, wherein the other end of said feed pin is coupled to said radiating patch.

22. The antenna of claim 15, further comprising:

a matching pad formed on said feed line and disposed adjacent said feed pin to control impedance of the feed line.

23. The antenna of claim 15, further comprising:

an open stub coupled to the other end of said feed pin, disposed to be parallel to said feed line, and having a predetermined length.

24. A planar inverted F antenna in a telecommunication terminal having a ground, said antenna comprising:

a feed pin directing a current;

a first feed line having one end coupled to said feed pin and having a first predetermined length;

a second feed line having one end coupled to said feed pin, disposed to be parallel to said first feed line;

a radiating patch formed on a surface spaced-apart from said first and second feed lines by a predetermined distance, said radiating patch having a slot starting from one edge end and extending to another edge of the radiating patch to divide said radiating patch into a first patch area coupled to said feed pin and a second patch area coupled to the other end of said second feed line; and

a shorting member having a coupling pad formed on one end of said shorting member to be coupled to said ground, said shorting member having the other end coupled to said first patch area of said radiating patch, said coupling pad coupled to the other end of said first feed line.

25. The antenna of claim 24, wherein one of said first and second feed lines is a loop shape.

26. The antenna of claim 24, wherein one of said first and second feed lines is a meander shape.

27. The antenna of claim 24, further comprising at least two dielectric layers, wherein one of said first and second feed line comprises a first portion formed on one of the dielectric layers and a second portion formed on the other one of said dielectric layers.

28. The antenna of claim 24, wherein one of said first and second feed lines comprises:

a coupling pin coupling the other end of said one of said first and second feed lines to said radiating patch.

29. The antenna of claim 24, wherein said one edge and the other edge of said slot of said radiating patch are formed on the same edge of said radiating patch.

30. The antenna of claim 24, wherein the other end of said feed pin is spaced-apart from the radiating patch and electrically coupled with said radiating patch.

31. The antenna of claim 24, wherein the other end of said feed pin is coupled to said radiating patch.

32. The antenna of claim 24, further comprising:

a matching pad formed on said feed line and disposed adjacent said feed pin to control impedance of the feed line.

33. The antenna of claim 24, further comprising:

an open stub coupled to the other end of said feed pin, disposed to be parallel to said feed line, and having a predetermined length.