Low-profile antenna receiving vertical polarized signal

• US 8,803,748 B2
• Filed: 05/25/2011
• Issued: 08/12/2014
• Est. Priority Date: 08/11/2010
• Status: Active Grant

• Current Assignee: Industry-University Cooperation Foundation Hanyang University
• Original Assignee: Industry-University Cooperation Foundation Hanyang University
• Inventors: Cho, Yong Soo, Lim, Sungjoon, Baek, Seunghee
• Primary Examiner(s): Lee, Michael G
• Assistant Examiner(s): Mikels, Matthew
• Application Number:
  US13/115,317
• Publication Number:
  US 20120038526A1
• Time in Patent Office: 1,175 Days
• Field of Search: 343711-717
• US Class Current: 343/713
• CPC Class Codes: H01Q 1/3275 mounted on a horizontal surface of the vehicle, e.g. on roof, hood, trunk
• 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 9/0407 Substantially flat resonant element parallel to ground plane, e.g. patch antenna dipole H01Q9/285; monopole H01Q9/40

Abstract

A low-profile antenna is provided. A laminated substrate is formed into a structure in which a plurality of substrates having different permittivities are stacked, and a radiator consists of a plurality of unit patches disposed on an upper surface of the laminated substrate and generates an electric field perpendicular to the upper surface of the laminated substrate. Ground vias are formed from the respective unit patches to a ground plane disposed on a lower surface of the laminated substrate through the substrates constituting the laminated substrate. In the low-profile antenna, the radiator consisting of the plurality of patches is disposed on the upper surface of the laminated substrate having a structure in which the plurality of substrates are stacked to generate a magnetic loop around the patches, so that vertical polarized signals can be received due to a magnetic field perpendicular to the upper surface of the laminated substrate.

Claims

1. A low-profile antenna, comprising:

a laminated substrate formed into a structure in which a plurality of substrates having different permittivity are stacked;

a radiator consisting of a plurality of unit patches disposed on an upper surface of the laminated substrate, and configured to generate an electric field perpendicular to the upper surface of the laminated substrate; and

ground vias formed from the respective unit patches to a ground plane disposed on a lower surface of the laminated substrate through the substrates constituting the laminated substrate.

2. The low-profile antenna of claim 1, wherein the laminated substrate is formed into the structure in which a first substrate, a second substrate, and a third substrate are stacked in sequence on the ground plane,

wherein the first substrate and the third substrate have the same permittivity, and the second substrate is foam.

3. The low-profile antenna of claim 1, wherein a thickness of the laminated substrate and a distance between the unit patches are set to values for obtaining a previously set resonant frequency.

4. The low-profile antenna of claim 2, wherein a thickness of the laminated substrate and a distance between the unit patches are set to values for obtaining a previously set resonant frequency.

5. The low-profile antenna of claim 1, wherein the unit patches have a one-quarter oval shape, and

four of the unit patches having the same size are disposed in an oval shape to constitute the radiator.

6. The low-profile antenna of claim 2, wherein the unit patches have a one-quarter oval shape, and

four of the unit patches having the same size are disposed in an oval shape to constitute the radiator.

7. The low-profile antenna of claim 5, wherein a feed point for power feeding in accordance with a coaxial feeding method is set in a gap between the unit patches corresponding to one axis of the oval shape.

8. The low-profile antenna of claim 6, wherein a feed point for power feeding in accordance with a coaxial feeding method is set in a gap between the unit patches corresponding to one axis of the oval shape.

9. The low-profile antenna of claim 7, wherein a width of the one axis of the oval shape in which the feed point is set is greater than a width of the other axis of the oval shape, and

a feeding patch of a previously set size is disposed at a position where the feed point is set.

10. The low-profile antenna of claim 8, wherein a width of the one axis of the oval shape in which the feed point is set is greater than a width of the other axis of the oval shape, and

a feeding patch of a previously set size is disposed at a position where the feed point is set.

11. The low-profile antenna of claim 1, wherein the low-profile antenna is contained in a package disposed on the ground plane to cover the laminated substrate.

12. The low-profile antenna of claim 1, wherein the ground plane is an upper surface of a vehicle roof.