Flat panel antenna

• US 6,157,344 A
• Filed: 02/05/1999
• Issued: 12/05/2000
• Est. Priority Date: 02/05/1999
• Status: Expired due to Term

• Current Assignee: Laird Connectivity Inc.
• Original Assignee: Xertex Technologies, Inc. (Laird Limited)
• Inventors: Bateman, Blaine Rexel, Munson, Robert Eugene
• Primary Examiner(s): LE, HOANGANH T
• Application Number:
  US09/245,477
• Time in Patent Office: 669 Days
• Field of Search: 343/700 MS, 343/846, 343/829, 343/830, 343/702, 343/906, 343/713, 343/711
• US Class Current: 343/700.0MS
• CPC Class Codes: G06F 1/1616 with folding flat displays, e.g. laptop computers or notebooks having a clamshell configuration, with body parts pivoting to an open position around an axis parallel to the plane they define in closed position
• CPC Class Codes: G06F 1/1626 with a single-body enclosure integrating a flat display, e.g. Personal Digital Assistants [PDAs]
• CPC Class Codes: G06F 1/1698 the I/O peripheral being a sending/receiving arrangement to establish a cordless communication link, e.g. radio or infrared link, integrated cellular phone details of antennas disposed inside a computer H01Q1/2266
• CPC Class Codes: H01Q 1/2266 disposed inside the computer
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 1/3233 particular used as part of a sensor or in a security system, e.g. for automotive radar, navigation systems
• CPC Class Codes: H01Q 1/3291 mounted in or on other locations inside the vehicle or vehicle body
• 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 9/40 Element having extended radiating surface

Abstract

A small size, flat panel, 1/6^th wavelength antenna is provided. A flat copper-clad dielectric substrate is processed on a first flat side to produce a copper triangular or pseudo triangular-shaped radiating element having a linear copper feed line that extends from the triangle apex. The substrate is also processed on its opposite flat side to produce a rectangular-shaped first copper ground plane element that underlies at least a portion of the copper feed line, but does not underlie the copper radiating element. The first side of the substrate may also be processed to produce a second copper ground plane element that is out of physical engagement with both the copper feed line and the copper radiation element. Aligned through holes are formed in the first ground plane element and the substrate. The metal sheath of a coaxial cable connects to the copper ground plane member(s), and the cable center conductor penetrates the aligned through holes and connects to the copper feed line. The antenna substrate may be a portion of a printed circuit board, or the like, that is within a mobile wireless communication device, such as a laptop computer or a cellular telephone. The antenna ground plane element(s) may also function as the ground plane for another antenna, such as a GPS antenna.

Claims

1. A flat panel antenna comprising:

a flat dielectric substrate having a first surface, a second surface that is generally parallel to said first surface, a first edge, and a second edge that is located generally opposite said first edge;

a triangular-shaped metal radiating element on said first surface, said radiating element having a 60-degree triangle apex that is formed by the intersection of two linear triangle sides, and said radiating element having a linear triangle base at whose opposite ends said triangle sides terminate, said triangle base being located generally adjacent to said first edge;

a linear metal feed line including and formed as an extension of said triangle apex, said feed line extending in a direction away from said triangle base and extending from said triangle apex toward said second substrate edge;

a continuous metal ground plane element on said second surface, said ground plane element having a first edge located generally adjacent to said second substrate edge, and said ground plane element having a second edge that dimensionally overlaps said feed line and only said apex of said radiating element;

electrical connection means having a ground element and a feed conductor;

first connection means electrically connecting said ground element to said ground plane element; and

second connection means electrically connecting said feed conductor to said feed line.

2. The antenna of claim 1 wherein said ground plane element is rectangular in shape.

3. The antenna of claim 1 wherein said ground plane element is rectangular in shape, and wherein said triangular shaped radiating element is an equilateral triangle.

4. The antenna of claim 1 including:

a first through opening formed in said ground plane element at a location that is generally coincident with a portion of said feed line and that excludes said triangle apex;

a second through opening in said substrate generally coincident with said first through opening;

wherein said ground element comprises an annular metal member electrically connected to said ground plane element generally adjacent to said first through opening; and

wherein said feed conductor passes through said first and second through holes and electrically connects to said feed line.

5. The antenna of claim 4 including:

an insulator protective coating covering said antenna.

6. An antenna comprising:

a flat dielectric substrate having a first flat side, a second flat side that is generally parallel to said first flat side, a first edge portion, and a second edge portion that is located opposite to said first edge portion;

an equilateral triangle-shaped flat metal radiating element on said first substrate side, said radiating element having first and second linear sides that define an apex portion, and said radiating element having a linear base that is located generally adjacent to said first edge portion of said substrate;

a flat and linear metal feed line integrally including and formed as an extension of said apex portion, said feed line extending away from said apex portion in a direction that is generally perpendicular to said base portion, said feed line having an end that is located a distance from said second edge portion of said substrate;

a first flat and continuous metal ground plane element on said first substrate side, said first ground plane element having a first edge portion that is located generally adjacent to said second edge portion of said substrate, said first ground plane element having a second edge portion that is located opposite to said first edge portion and is spaced at a distance from said end of said feed line;

a second flat and continuous metal ground plane element on said second substrate side, said second ground plane element having a first edge portion that is located generally adjacent to said second edge portion of said substrate, said second ground plane element having a second edge portion that is located opposite to said first edge portion and that underlies said feed line and only said apex portion of said radiating element, said second ground plane element having a through opening formed therein at a location that is intermediate said first and second edge portions at a location that is generally coincident with said end of said feed line;

a through opening in said substrate generally coincident with said through opening in said second ground plane element;

connector means having a ground element and a conductor element;

first connection means electrically connecting said ground element to said first and second ground plane elements, so as to cause said conductor element to penetrate said through opening in said substrate; and

second connecting means electrically connecting said conductor element to said end of said feed line.

7. The antenna of claim 6 wherein said first and second ground plane elements are rectangular in shape.

8. A flat panel antenna comprising:

a flat, thin, rigid and dielectric substrate having a first flat side, a second flat side that is generally parallel to said first flat side, a first edge, a second edge that is located opposite to said first edge, and a long axis that extends between said first and second edges;

a triangular-shaped metal radiating element integrally formed on said first substrate side, said radiating element having two linear sides that intersect to form a 60-degree apex that is located intermediate said first and second edges, and said radiating element having a linear base having opposite ends at which said linear sides respectively terminate, said base being located generally adjacent to said first edge of said substrate;

a generally linear metal feed line formed on said first substrate side as an integral extension of and including said apex, said feed line extending toward said second edge of said substrate;

a first continuous metal ground plane element integrally formed on said second substrate side, said first ground plane element having a first edge that is located generally adjacent to said second edge of said substrate, said first ground plane element having a second edge that underlies said feed line and only said apex of said radiating element;

an opening in said first ground plane element at a location that is generally under said feed line and excludes said apex of said radiating element, said first ground plane element having a metal portion adjacent to said opening in said first ground plane element;

an opening in said substrate generally coincident with said opening in said first ground plane element;

connector means having a metal ground connection and a metal feed conduction;

mounting means physically mounting and electrically connecting said metal ground connection to said metal portion of said first ground plane element, so as to cause said metal feed conduction to penetrate said coincident openings in said first ground plane element and said substrate; and

connecting means electrically connecting said feed conduction to said feed line.

9. The antenna of claim 8 wherein said triangular shaped radiating element comprises a plurality of individual metal conductors that are convoluted to form a triangular exterior shape.

10. The antenna of claim 8 including:

a second continuous metal ground plane element integrally formed on said first substrate side, said second ground plane element having a first edge that is located generally adjacent to said second edge of said substrate, said second ground plane element having a second edge that is located opposite to said first edge and spaced from said feed line.

11. The antenna of claim 8 including:

a protective insulating coating covering said antenna; and

a GPS module mounted on said protective coating and overlying said first ground plane element, said GPS module including a GPS antenna, and said first ground plane element forming a ground plane element for said GPS antenna.

12. A method of making an antenna comprising the steps of:

providing a flat dielectric substrate having a first flat side that carries a first continuos metal coating, having a second flat side that is generally parallel to said first flat side and that carries a second continuous metal coating, having a first dielectric edge, and having a second dielectric edge that is located opposite said first dielectric edge;

forming a triangle-shaped metal radiating element in said first metal coating by selectively removing said first metal coating, said radiating element having a linear base that is located generally adjacent to said first dielectric edge, said radiating element having two sides that converge to form a 60-degree apex portion that is located intermediate said first and second dielectric edges;

concomitantly forming a continuous metal feed line as an extension of said apex portion by said selectively removing said first metal coating, said feed line extending from said apex portion toward said second dielectric edge;

forming a continuous metal ground plane element integrally in said second metal coating by selectively removing said second metal coating, said ground plane element having a first edge that is located generally adjacent to said second dielectric edge, and said ground plane element having a second edge that underlies said feed line and only said apex portion of said radiating element;

providing electrical connection means having a ground conductor and a feed conductor;

electrically connecting said ground conductor to said ground plane element; and

electrically connecting said feed conductor to said feed line.

13. The method of claim 12 wherein said ground plane element is rectangular in shape.

14. The method of claim 12 wherein said ground plane element is rectangular in shape and said radiating element is an equilateral triangle.

15. The method of claim 14 including the steps of:

concomitantly forming a second continuous ground plane element in said first metal coating by said selective removal of said first metal coating, said second ground plane element generally overlying said ground plane element formed in said second metal coating, said second ground plane element being physically spaced from said feed line; and

electrically connecting said ground conductor to said second ground plane element.

16. A method of making a flat panel transmit/receive antenna comprising the steps of:

providing a flat dielectric substrate having a first side surface, a second side surface that is generally parallel to said first side surface, a first substrate edge, and a second substrate edge that is located generally opposite said first substrate edge;

providing a continuous and triangular shaped metal radiating element on said first side surface, said radiating element having a 60-degree apex portion, said radiating element having a relatively wide and linear base that is located generally adjacent to said first substrate edge, and said radiating element having two linear sides that extend from opposite ends of said base and converge to form said apex portion;

providing a continuous metal feed line as an extension of said apex portion, said feed line extending including only said apex portion and extending from said apex portion toward said second substrate edge;

providing a continuous metal ground plane element on said second side surface, said ground plane element having a first edge located generally adjacent to said second substrate edge, and said ground plane element having a second edge that underlies said feed line and only said apex portion of said radiating element;

providing electrical connection means having a ground element and a feed conductor;

providing first connection means electrically connecting said ground element to said ground plane element; and

providing second connection means electrically connecting said feed conductor to said feed line.

17. The method of claim 16 wherein said ground plane element is rectangular in shape.

18. The method of claim 16 wherein said ground plane element is rectangular in shape, and wherein said radiating element is an equilateral triangle.

19. The method of claim 16 including the steps of:

providing a first through opening in said ground plane element at a location that generally underlies a portion of said feed line that excludes said apex portion;

providing a second through opening in said substrate generally coincident with said first through opening;

providing said ground element is electrically connected to said ground plane member; and

providing said feed conductor passes through said first and second through holes and is electrically connected to said portion of said feed line.

20. The method of claim 19 including the step of:

providing an insulator protective coating covering said antenna.