Internal antenna

• US 20050040992A1
• Filed: 07/22/2004
• Published: 02/24/2005
• Est. Priority Date: 07/22/2003
• Status: Active Grant

• Current Assignee: Psion PLC (Motorola Solutions, Inc.)
• Original Assignee: Psion Teklogix (Motorola Solutions, Inc.)
• Inventors: Chirila, Laurian P.
• Granted Patent: US 7,050,009 B2
• Time in Patent Office: Days
• US Class Current: 343/770
• 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 13/106 Microstrip slot antennas patch antenna elements H01Q9/0407
• CPC Class Codes: H01Q 9/0407 Substantially flat resonant element parallel to ground plane, e.g. patch antenna dipole H01Q9/285; monopole H01Q9/40
• 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 9/0442 with particular tuning means

Abstract

An antenna comprising a substrate having a pair of oppositely directed surfaces. A source plane conductor is located on one of the surfaces and has a signal line connected thereto. A ground plane conductor is located on another of the surfaces. Each of the conductors has a slot extending therethrough with said slots sized and positioned relative to one another to inhibit the intensity of radiation emanating from the ground plane.

Claims

1. An antenna comprising a substrate having a pair of oppositely directed surfaces, a source plane conductor on one of said surfaces having a signal line connected thereto, a ground plane conductor on another of said surfaces, each of said conductors having a slot extending therethrough with said slots sized and positioned relative to one another to inhibit the intensity of radiation emanating from said ground plane.

2. An antenna according to claim 1 wherein each of said slots extend from a peripheral edge of said substrate.

3. An antenna according to claim 2 wherein one of said slots is L shaped.

4. An antenna according to claim 3 wherein both of said slots is L shaped.

5. An antenna according to claim 2 wherein each of said slots has an axial leg extending on a longitudinal axis of said antenna and a transverse leg extending from said peripheral edge to intersect said axial leg.

6. An antenna according to claim 5 wherein said axial legs are aligned on each of said planes.

7. An antenna according to claim 5 wherein said transverse legs are aligned on each of said planes.

8. An antenna according to claim 3 wherein one of said slots is formed as an H with an intermediate leg extending to a peripheral edge.

9. An antenna according to claim 1 wherein the length of the slot in the source plane is between 1.46 and 1.36 that of the slot in the ground plane.

10. An antenna according to claim 1 wherein the length of the slot in the source plane is between 1.60 and 1.51 that of the slot in the ground plane.

11. An antenna according to claim 1 wherein the length of the slot in the source plane is between 3.0 and 3.04 that of the slot in the ground plane.