Wideband antena device with extended ground plane in a portable device

• US 20060109182A1
• Filed: 06/11/2003
• Published: 05/25/2006
• Est. Priority Date: 06/13/2002
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Ericsson Mobile Communications AB (Sony Group Corp.)
• Inventors: Uildriks, Tjapko, Schreuder, Johannes Lucas, Rosenberg, Johan Anton Eduard
• Granted Patent: US 7,319,433 B2
• Time in Patent Office: Days
• US Class Current: 343/702
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 1/48 Earthing means; Earth screens; Counterpoises
• CPC Class Codes: H01Q 7/00 Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop

Abstract

An antenna device for a portable device has an antenna loop of conducting material to be connected to radio circuitry in the portable device. The antenna loop is positioned opposite a ground plane of a PCB. Also, the antenna device also comprises at least one battery, which is positioned in the extension of a first side of the PCB, and acts as an extension of the ground plane of the PCB.

Claims

1. An antenna device for a portable device, the antenna device comprising

an antenna loop of conducting material having first and second ends connected to radio frequency (RF) circuitry and a ground plane of a printed circuit board (PCB), respectively, the antenna loop being positioned opposite the ground plane;

and a ground plane extender positioned at a first side of the PCB and in a longitudinal extension of the ground plane.

2. The antenna device according to claim 1, wherein the antenna loop comprises first and second connectors provided at a second side of the PCB configured to connect the first and second ends of the antenna loop to the RF circuitry and the ground plane of the PCB, respectively.

3. The antenna device according to claim 2, wherein the antenna loop further comprises:

a first portion having a first and a second end, the first portion extending in a first direction along a third side of the PCB, the first end of the first portion being connected to the RF circuitry of the PCB;

a second portion having a first and a second end, the first end of the second portion being connected to the second end of the first portion, the second portion extending in a second direction from the third side of the PCB towards a fourth side thereof, which is opposite the third side; and

a third portion having a first and a second end, the first end of the third portion being connected to the second end of the second portion and the second end of the third portion being connected to the ground plane of the PCB, the third portion extending in the opposite direction of the first direction along the fourth side of the PCB.

4. The antenna device according to claim 1, wherein the PCB is a multi-layer PCB having one layer configured as a dedicated RF ground plane that provides the ground plane of the antenna device.

5. The antenna device according to claim 1, wherein the ground plane extender is at least one battery casing of a battery cell, the at least one battery casing being positioned in the longitudinal extension of the ground plane of the PCB.

6. The antenna device according to claim 1, wherein the antenna loop is positioned opposite a first or a second surface of the PCB.

7. The antenna device according to claim 1, wherein the conducting material of the antenna loop is metal.

8. The antenna according to claim 6, further comprising a U-shaped dielectric having the antenna loop etched into the dielectric.

9. The antenna device according to claim 4, wherein the antenna loop is provided inside the PCB.

10. The antenna device according to claim 1, wherein the PCB further comprises a second side opposite the first side, a third side adjacent the first and second sides, and a fourth side opposite the third side, the antenna device further comprising a bezel connected to the PCB that extends from the third side of the PCB towards the fourth side of the PCB, and/or bezel flanges connected to the ground plane and extending along the third and fourth sides of the PCB.

14. The loop antenna device according to claim 1, wherein the ground plane extender is a battery casing.

11. A multi-layer printed circuit board (PCB) comprising:

radio frequency (RF) circuitry and a ground plane on the PCB;

an antenna device connected to the PCB, the antenna device comprising;

an antenna loop of conducting material having first and second ends connected to the radio frequency (RF) circuitry and the ground plane of the PCB, respectively the antenna loop being positioned opposite the ground plane; and

a ground plane extender positioned at a first side of the PCB and in a longitudinal extension of the ground plane.

12. A portable communication device comprising:

a printed circuit board (PCB) comprising radio frequency (RF) circuitry and a ground plane;

an antenna device connected to the PCB, the antenna device comprising;

an antenna loop of conducting material having first and second ends connected to the radio frequency (RF) circuitry and the ground plane of the PCB, respectively, the antenna loop being positioned opposite the ground plane; and

a ground plane extender positioned at a first side of the PCB and in a longitudinal extension of the ground plane.

13. The portable communication device according to claim 12, wherein the portable communication device is a headset.