Broadband internal antenna

• US 7,180,455 B2
• Filed: 03/29/2005
• Issued: 02/20/2007
• Est. Priority Date: 10/13/2004
• Status: Expired due to Fees

• Current Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Original Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Inventors: Kim, Chul Ho, Kim, Hyun Hak, Kim, Tae Sung, Oh, Sae Won, Do, Gi Tae, Kim, Young Deg
• Primary Examiner(s): Nguyen; Hoang V.
• Assistant Examiner(s): Alemu; Ephrem
• Application Number:
  US11/091,987
• Publication Number:
  US 20060077115A1
• Time in Patent Office: 693 Days
• Field of Search: 343/725, 343/728, 343/895, 343/702
• US Class Current: 343/725
• CPC Class Codes: H01Q 1/362 for broadside radiating helical antennas
• 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 5/357 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 broadband internal antenna includes a first radiator having a radiation part with one or more coils having different pitch intervals connected in series to each other, and a second radiator having at least one conductive strip line arranged parallel to a longitudinal direction of the first radiator. The antenna further includes a connection part to which an end of the at least one conductive strip line is connected, to which a first end of the first radiator is attached and in which a part for supplying current to the antenna and a part for grounding the antenna are formed, and an attachment pad to which a second end of the first radiator is attached and from which current is drawn. Current flowing through the first radiator and current flowing through the strip lines form current paths in different directions to set a certain broadband using mutual Electromagnetic (EM) coupling.

Claims

1. A broadband internal antenna, comprising:

a first radiator having a radiation part in which one or more coils having different pitch intervals are connected in series to each other; and

a second radiator having at least one conductive strip line arranged parallel to a longitudinal direction of the first radiator, a connection part to which an end of the at least one conductive strip line is connected, to which a first end of the first radiator is attached and in which a power feeding part for supplying current to the antenna and a ground part for grounding the antenna are formed, and an attachment pad to which a second end of the first radiator is attached and from which current is drawn;

wherein current flowing through the first radiator and current flowing through the strip lines form current paths in different directions, thus setting a certain broadband using mutual Electromagnetic (EM) coupling.

2. The broadband internal antenna as set forth in claim 1, wherein the first radiator is wound substantially in a rectangular parallelepiped shape.

3. The broadband internal antenna as set forth in claim 1, wherein the first radiator comprises a first coil wound in a rectangular parallelepiped shape to have a certain pitch interval and a second coil having a pitch interval larger than that of the first coil,

whereby a first pass band is set using an entire length of the first and second coils and a second pass band is set using the second coil.

4. The broadband internal antenna as set forth in claim 1, wherein the first end of the first radiator is connected to a power feeding line for supplying current, and the power feeding line is attached to the power feeding part.

5. The broadband internal antenna as set forth in claim 1, wherein a second end of the first radiator is connected to a drawing line from which current is drawn, and the drawing line is attached to the second radiator by connecting to an attachment pad that is formed on the second radiator.

6. The broadband internal antenna as set forth in claim 1, wherein a resonant frequency and a bandwidth of the antenna can be controlled by changing lengths of the at least one conductive strip line.

7. The broadband internal antenna as set forth in claim 1, wherein the second radiator is formed of a Printed Circuit Board (PCB).

8. The broadband internal antenna as set forth in claim 1, wherein the second radiator is formed by a Low Temperature Co-fired Ceramics (LTCC) process.

9. The broadband internal antenna as set forth in claim 1, wherein the pitch interval, number of windings, and total length of the coils of the radiation part are controlled to obtain two or more desired resonant frequency bands.

10. The broadband internal antenna as set forth in claim 1, further comprising a casing made of a dielectric to surround the first radiator.

11. The broadband internal antenna as set forth in claim 10, wherein the casing is made of a dielectric having a dielectric constant between 2 and 3.