EMC- arrangement for a device employing wireless data transfer

• US 20040100412A1
• Filed: 01/14/2003
• Published: 05/27/2004
• Est. Priority Date: 01/15/2002
• Status: Active Grant

• Current Assignee: Flextronics Sales & Marketing A-P Ltd. (Flextronics International Limited)
• Original Assignee: Flextronics ODM Luxembourg SA (Flex, Ltd.)
• Inventors: Raisanen, Kari, Kurjenheimo, Timo
• Granted Patent: US 6,891,505 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 1/38 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 9/0421 with a shorting wall or a shorting pin at one end of the element H01Q9/0414 takes precedence
• CPC Class Codes: H04B 1/3833 Hand-held transceivers
• CPC Class Codes: H04B 15/00 Suppression or limitation of noise or interference by means associated with receiver H04B1/10
• CPC Class Codes: H05K 9/0022 of components mounted on printed circuit boards [PCB] shields integrated within component packages H01L23/552; shields integrated within PCB H05K1/0218

Abstract

The invention relates to a terminal employing wireless data transfer, comprising an enclosure structure consisting of at least one enclosure part (30), (40), (50), (60), an antenna (80) and a feed conductor (92) for receiving a signal from the antenna and/or feeding a signal into the antenna. By applying the invention, a device construction is achieved that makes it possible to improve the EMC properties of the device in a simple way and to improve the electric performance of the antenna of the device, especially to increase the frequency band of the antenna.

Claims

1. Terminal employing wireless data transfer, comprising

an enclosure structure formed from at least one enclosure part (30), (40), (50), (60),

an antenna (80), and

a feed conductor (92) for receiving a signal from the antenna and/or feeding a signal into the antenna, characterized in that

the enclosure part (40) comprises a lead-in part (100) integrated in it and forming in the enclosure part a tubular hole (101) through which the feed conductor is threaded to the antenna (80),

the lead-in part (100) is coated with an electrically conductive coating (41) at least on the inner surface of the tubular hole, and that

the coating (41) is galvanically connected to the antenna ground (72) of the device.

2. Terminal according to claim 1, additionally comprising a short-circuiting conductor (91) for connecting the antenna (80) to an antenna ground (72), characterized in that the short-circuiting conductor (91) is likewise threaded through said hole to the antenna (80) and galvanically connected at its opposite end from the antenna (80) to the antenna ground (72).

3. Terminal according to claim 1 or 2, characterized in that the enclosure part (40) has on one side on its surface a coating (41) of the same material as on the inner surface of the tubular hole and that the coating (41) on the enclosure part (40) is galvanically connected to the coating (41) on the inner surface.

4. Terminal according to claim 3, characterized in that the coating (41) of the lead-in part is connected to the antenna ground (72) of the device via the coating (41) on the enclosure part (40).

5. Terminal according to claim 3 or 4, characterized in that the coating (41) is on the surface of a plastic enclosure structure.

6. Terminal according to claim 2, 3 or 4, characterized in that the short-circuiting conductor (91) and the feed conductor (92) are connected at their opposite ends from the antenna to contact surfaces (93), (94) formed for them on a circuit board comprised in the device.

7. Terminal according to claim 6, characterized in that the contact surfaces (92), (94) are in alignment with the tubular hole (101) formed by the lead-in part (100).

8. Terminal according to claim 3 or 4, characterized in that the lead-in part (10) is substantially entirely coated with said coating (41).

9. Terminal according to claim 2, 3 or 4, characterized in that the short-circuiting conductor (91) and the feed conductor (92) are implemented using spring connectors.

10. Terminal according to any one of claims 1-9, characterized in that the lead-in part (100) forms a protrusion at least at its end pointing towards the antenna, so that the enclosure part extends closer to the antenna in the area of the lead-in part (100) than in the area around the lead-in part (100).

11. Terminal according to claim 10, characterized in that the lead-in part (100) also forms a protrusion at its end opposite to the antenna, said protrusion extending outwards from the plane of the enclosure part.

12. Terminal according to any one of claims 1-11, characterized in that it is a portable subscriber terminal, preferably a mobile station.

13. Enclosure part for a wireless terminal, characterized in that it comprises a lead-in part (100) constituting part of the same body with the enclosure part and forming a tubular hole (100) in the enclosure part, and that the lead-in part is coated with an electrically conductive coating (41) at least on the inner surface of the tubular hole.

14. Enclosure part according to claim 13, characterized in that it has on its surface at least on one side a coating (41) of the same material as on the inner surface of the tubular lead-in hole (101), and that the coating (41) on the enclosure part is galvanically connected to the coating (41) on the inner surface.