Multi-Input Multi-Output antenna with multi-band characteristic

• US 20120319904A1
• Filed: 11/14/2011
• Published: 12/20/2012
• Est. Priority Date: 06/16/2011
• Status: Active Grant

• Current Assignee: Bobae Kim
• Original Assignee: Neopulse Co., Ltd.
• Inventors: LEE, Jae Ho, Kim, Kook Hyun, Lee, Kyung Sub, Kang, Hyuk-Jin
• Granted Patent: US 8,723,735 B2
• Time in Patent Office: Days
• US Class Current: 343/700.MS
• 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 1/521 reducing the coupling between adjacent antennas
• CPC Class Codes: H01Q 21/28 Combinations of substantially independent non-interacting antenna units or systems multiple beam H01Q25/00
• CPC Class Codes: H01Q 5/28 Arrangements for establishing polarisation or beam width over two or more different wavebands
• CPC Class Codes: H01Q 5/40 Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements
• CPC Class Codes: H01Q 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength
• CPC Class Codes: H04B 7/0413 MIMO systems

Abstract

The present invention relates to a multi-input multi-output (MIMO) antenna with a multi-band characteristic which includes a plurality of MIMO antenna, each having a pair of antenna elements, to support multiple bands, and is capable of guaranteeing high antenna efficiency for different bands by minimizing an interference between antenna elements of each MIMO antenna to improve an isolation characteristic. The MIMO antenna system having a multi-band characteristic, which includes two pairs of antenna patterns to support different band and coupling antenna parts separated from and coupled with the pairs of antenna patterns, can improve an isolation through the coupling antenna parts and guarantee an antenna gain. Moreover, since signal interference caused by the coupling effect can be cancelled to guarantee a band width with no change in antenna characteristics, it is possible to constructing two or more antennas to support a multi-band while guaranteeing stable operation of the antennas.

Claims

1. A MIMO antenna system having a multi-band characteristic, comprising:

a circuit board including two pairs of power feeders;

a pair of carriers arranged in both sides of the circuit board;

a first antenna pattern corresponding to a first band and a second antenna pattern corresponding to a second band, which are connected to the power feeders and are formed in one of the carriers;

a third antenna pattern corresponding to the first band and a fourth antenna pattern corresponding to the second band, which are connected to the power feeders and are formed in the other carrier; and

a first coupling antenna part which is formed in the one carrier and operates with the first band and a second coupling antenna part which is formed on the other carrier and operates with the second band, the first and second coupling antenna parts being separated from each other on the carriers on which the antenna patterns are formed.

2. The MIMO antenna system according to claim 1, wherein the system uses wireless communication of LTE or Wibro (or Mobile WiMAX) and is accommodated in an antenna box including connectors for supplying current into the power feeders.

3. The MIMO antenna system according to claim 1, wherein the first band has a resonance frequency two times or more as high as that of the second band.

4. The MIMO antenna system according to claim 1, wherein at least one of the first and second coupling antenna parts includes an extension which faces the other coupling antenna part and performs a stub function.

5. The MIMO antenna system according to claim 1, wherein at least one of the first and second coupling antenna parts includes a closed loop.

6. The MIMO antenna system according to claim 1, wherein each of the first to fourth antenna patterns has a length of λ

/4.

7. The MIMO antenna system according to claim 1, wherein each of the first and second antenna parts has a length of λ

/2.

8. A MIMO antenna system having a multi-band characteristic, comprising:

a first carrier on which an antenna pattern corresponding to a first band and an antenna pattern corresponding to a second band are formed;

a second carrier on which an antenna pattern corresponding to the first band and an antenna pattern corresponding to the second band are formed, the second carrier being separated from the first carrier; and

a first coupling antenna part which is formed in the first carrier and operates with the first band and a second coupling antenna part which is formed on the second carrier and operates with the second band, the first and second coupling antenna parts being separated from each other on the first and second carriers.

9. The MIMO antenna system according to claim 8, wherein the first band is two times or more as high as the second band.

10. The MIMO antenna system according to claim 8, wherein at least one of the first and second coupling antenna parts includes an extension which faces the other coupling antenna part and performs a stub function.

11. The MIMO antenna system according to claim 8, wherein at least one of the first and second coupling antenna parts includes a closed loop.