Inverted F-antennas at a wireless communication node

• US 9,692,142 B2
• Filed: 01/29/2016
• Issued: 06/27/2017
• Est. Priority Date: 06/18/2013
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Kaspersson, Ola, Karlsson, Hkan, Ek, Anders
• Primary Examiner(s): PHAN, THO GIA
• Application Number:
  US15/010,178
• Publication Number:
  US 20160149316A1
• Time in Patent Office: 515 Days
• Field of Search: 343700 MS, 343702, 343829, 343846
• CPC Class Codes: H01Q 1/243 with built-in antennas
• 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 21/12 Parallel arrangements of substantially straight elongated conductive units travelling-wave antennas comprising transmission line loaded with transverse elements H01Q11/02; Yagi antennas H01Q19/30
• CPC Class Codes: H01Q 21/28 Combinations of substantially independent non-interacting antenna units or systems multiple beam H01Q25/00
• CPC Class Codes: H01Q 21/29 Combinations of different interacting antenna units for giving a desired directional characteristic H01Q25/00 takes precedence
• CPC Class Codes: H01Q 5/371 Branching current paths
• CPC Class Codes: H01Q 9/04 Resonant antennas
• CPC Class Codes: H01Q 9/0421 with a shorting wall or a shorting pin at one end of the element H01Q9/0414 takes precedence
• CPC Class Codes: H01Q 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Abstract

The disclosure relates to a node in a wireless communication arrangement, the node comprising an antenna arrangement that comprises a first and second inverted F antenna. The inverted F antennas comprise a corresponding first and second feed connection, first and second ground connection and a corresponding first and second radiating element mainly extending from the respective ground connection along a corresponding first and second longitudinal extension. The inverted F antennas are arranged on, or in, a plane. Furthermore, the first and second radiating elements are extending in opposite directions along their respective longitudinal extensions from the respective ground connections, the first longitudinal extension and the second longitudinal extension being mutually parallel. The closest distance between the first radiating element and the second radiating element exceeds 0.4*λ₀, where λ₀ is the wavelength for the center frequency of the frequency band for which the inverted F antennas are intended.

Claims

1. A node in a wireless communication arrangement, the node comprising:

an antenna arrangement comprising;

a base having a top side lying in a first plane and an opposite bottom side lying in a second plane parallel with the first plane;

a first inverted F antenna; and

a second inverted F antenna, wherein

the first inverted F antenna comprises a first feed connection, a first ground connection and a first radiating element being positioned above the top side of the base and lying in a third plane that is parallel with and spaced apart from the top side of the base, the first feed connection electrically connected to the first radiating element,

the second inverted F antenna comprises a second feed connection, a second ground connection and a second radiating element being positioned above the top side of the base and lying in said third plane, the second feed connection electrically connected to the second radiating element,

the first ground connection lies on a fourth plane that is perpendicular with the first and second planes,

the second ground connection lies on a fifth plane that is perpendicular with the first and second planes,

the fifth plane is spaced apart from the fourth plane.

2. The node according to claim 1, wherein the first inverted F antenna comprises a first upper radiating element and that the second inverted F antenna comprises a second upper radiating element.

3. The node according to claim 1, wherein each radiating element runs parallel to the first plane.

4. The node according to claim 1, wherein the base comprises an electrically conducting ground plane positioned on a dielectric material.

5. The node according to claim 4, wherein each feed connection is running to the corresponding radiating element through a corresponding aperture in the ground plane.

6. The node according to claim 1, wherein the shortest distance between the first radiating element and the second radiating element exceeds 0.4*λ

0, where λ

0 is the wavelength for the centre frequency of a frequency band for which the first and second inverted F antennas are intended.

7. An antenna arrangement, comprising:

a first inverted F antenna; and

a second inverted F antenna, wherein

the first inverted F antenna comprises a first feed connection, a first ground connection and a first radiating element extending from the first ground connection along a first longitudinal extension that lies on a first plane,

the second inverted F antenna comprises a second feed connection, a second ground connection and a second radiating element extending from the second ground connection along a second longitudinal extension,

the first ground connection lies on a second plane that is perpendicular to the first plane in which lies the first longitudinal extension,

the second ground connection lies on a third plane that is parallel with the second plane,

the second plane is spaced apart from the third plane,

the first radiating element extends from the first ground connection towards the third plane in which the second ground connection lies, and

the second radiating element extends from the second ground connection towards the second plane in which the first ground connection lies.

8. The antenna arrangement according to claim 7, wherein

the first inverted F antenna further comprises a first upper radiating element extending from the first ground connection towards the third plane, and

the second inverted F antenna further comprises a second upper radiating element extending from the second ground connection towards the second plane.

9. The antenna arrangement according to claim 8, wherein each said radiating element runs parallel to a ground plane.

10. The antenna arrangement according to claim 7, wherein the ground plane is positioned on a dielectric material.

11. The antenna arrangement according to claim 10, wherein each feed connection is running to the corresponding radiating element through a corresponding aperture in the ground plane.

12. The antenna arrangement according to claim 7, the shortest distance between the first radiating element and the second radiating element exceeds 0.4*λ

0, where λ

0 is the wavelength for the center frequency of a predetermined frequency band.