WO2011021925A1 - A shielding system - Google Patents
A shielding system Download PDFInfo
- Publication number
- WO2011021925A1 WO2011021925A1 PCT/MY2010/000149 MY2010000149W WO2011021925A1 WO 2011021925 A1 WO2011021925 A1 WO 2011021925A1 MY 2010000149 W MY2010000149 W MY 2010000149W WO 2011021925 A1 WO2011021925 A1 WO 2011021925A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- wireless modules
- electromagnetic interference
- wireless
- modules
- shielding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
- H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems
Definitions
- a SHIELDING SYSTEM FIELD OF INVENTION The present invention relates to a shielding system for controlling emission of electromagnetic interference from a plurality of wireless modules electrically connected to a printed circuit board (PCB).
- PCB printed circuit board
- WiWi Generation 1.5 basically is the integration of WiFi a/b/g and 2.3 GigaHertz (GHz) WiMax which poses many complications during the development stage. Most of the solutions today focus on 3.5 GHz WiMax and 2.4 GHz at WtFi. The complication when integrating two products of very close frequency on a same device as this introduces interference and distorts signal quality. Low Noise Amplifiers (LNA) suffers from interference at both frequencies that are being used. This results in poor Quality of Service (QoS) which translates to less coverage and low data rate. These undesirable traits cause instability of devices where device needs to resend packets too frequently due to data loss.
- LNA Low Noise Amplifiers
- High speed processors usually work with high speed buses arid high clock. These high speed transmission elements introduce strong electromagnetic interference that can possibly affect the performance of WiMax and WiFi systems.
- the problems usually start to occur when the processors at the main board begin operating at 166 MegaHertz (MHz) to 2 GHz.
- Most existing systems combine WiFi and WiMax in Mini Peripheral Component Interconnect (MiniPCI) bus due to the standardized form factor issues that do not allow them to be integrated in any other method. Therefore it miniaturization of modules is an issue which causes the devices to support only a limited frequency range.
- MinPCI Mini Peripheral Component Interconnect
- a shielding system for controlling emission of electromagnetic interference from a plurality of wireless modules electrically connected to a printed circuit board (PCB), characterized in that, the system includes a plurality of wireless modules operational in at least two different frequencies, wherein the frequencies cause electromagnetic interference to one another, a plurality of metal casings positionable around the plurality of wireless modules wherein the plurality of metal casings shield electronic components of a wireless modules from said electromagnetic interference, wherein the wireless modules are connected to a metal ground plane.
- PCB printed circuit board
- PCB printed circuit board
- Figure 1 is a front view and a side view of a first embodiment of a shielding system
- Figure 2 is a front view and a side view of a second embodiment of a shielding system
- Figure 3 is a front view and a side view of a third embodiment of a shielding system.
- the present invention relates to a shielding system for controlling emission of electromagnetic interference from a plurality of wireless modules electrically connected to a printed circuit board (PCB).
- PCB printed circuit board
- Figure 1 shows an embodiment of the invention which is a shielding system (100) for controlling emission of electromagnetic interference from a plurality of wireless modules (101, 103) electrically connected to a printed circuit board (PCB), where a plurality of wireless modules (101,103) operational in at least two different frequencies, wherein the frequencies cause electromagnetic interference to one another, a plurality of metal casings positionable around the plurality of wireless modules (101, 103) wherein the plurality of metal casings shield electronic components of a wireless modules (101, 103) from said electromagnetic interference, (101, 103) wherein the wireless modules (101, 103) are connected to a metal ground plane of the PCB.such that electromagnetic interference does not affect each other.
- a shielding system 100 for controlling emission of electromagnetic interference from a plurality of wireless modules (101, 103) electrically connected to a printed circuit board (PCB), where a plurality of wireless modules (101,103) operational in at least two different frequencies, wherein the frequencies cause electromagnetic interference to one another, a plurality of metal casings positionable
- FIG. 1 An example of wireless modules (101, 103) used are WiFi and Worldwide Interoperability for Microwave Access (WiMax).
- Figure 2 shows a second embodiment of the invention where a shielding system (100) for controlling emission of electromagnetic interference from a plurality of wireless modules (101, 103) electrically connected to a printed circuit board (PCB) is shown.
- PCB printed circuit board
- the system (100) includes a plurality of wireless modules (101,103) operational in at least two different frequencies, wherein the frequencies cause electromagnetic interference to one another, a processor, wherein the processor is positionable between and of a predetermined distance from the plurality of wireless modules (101, 103), a plurality of metal casings positionable around the plurality of wireless modules (101, 103) wherein the plurality of metal casings shield electronic components of a wireless modules (101, 103) from said electromagnetic interference, wherein the wireless modules (101, 103) are positionable at a predetermined distance from each module (101, 103) such that electromagnetic interference does not affect each other.
- the system (100) in Figure 2 further includes a common cable (104) wherein the plurality of wireless modules (101, 103) are connectable to a transmitting or receiving means, such as an antenna, by the cable (104), wherein output from the plurality of wireless modules (101, 103) are transmitted and received digitally in the common cable (104).
- wireless modules (101, 103) used are WiFi and WiMax.
- the cable (104) used may be up to 1 meter length and supports digital transmission such as Universal Serial Bus (USB), Secure Digital Input Output (SDIO) and Parallel Bus.
- USB Universal Serial Bus
- SDIO Secure Digital Input Output
- Parallel Bus Parallel Bus
- Figure 3 shows another embodiment where a shielding system (100) for controlling emission of electromagnetic interference from a plurality of wireless modules (101 , 103) electrically connected to a printed circuit board (PCB), where a plurality of wireless modules (101,103) operational in at least two different frequencies, wherein the frequencies cause electromagnetic interference to one another, a processor, wherein the processor is positionable between and of a predetermined distance from the plurality of wireless modules (101 , 103), a plurality of metal casings positionable around the plurality of wireless modules (101, 103) wherein the plurality of metal casings shield electronic components of a wireless modules (101, 103) from said electromagnetic interference, wherein the wireless modules (101, 103) are positionable at a predetermined distance from each module (101, 103) such that electromagnetic interference does not affect each other.
- a shielding system (100) for controlling emission of electromagnetic interference from a plurality of wireless modules (101 , 103) electrically connected to a printed circuit board (PCB), where a plurality of wireless modules (101,
- wireless modules (101, 103) used are WiFi and WiMax.
- a method for shielding wireless modules (101, 103) from emission of electromagnetic interference from a plurality of wireless modules (101, 103) electrically connected to a printed circuit board (PCB) is also described in that the method includes positioning the wireless modules (101, 103) at a predetermined distance from one another such that the electromagnetic interference does not affect each other and placing a metal shielding around electronic components of each wireless module (101 , 103) as seen in Figure 3.
- a second method for shielding wireless modules (101, 103) from emission of electromagnetic interference from a plurality of wireless modules (101, 103) electrically connected to a printed circuit board (PCB) is also described in that the method includes placing a metal shielding around electronic components of each wireless module (101, 103) a wherein the wireless modules (101, 103) are connected to the metal ground plane of the PCB as seen in Figure 1.
- the metal ground plane prevents crosstalk between any components in both modules.
- Optimum metal shielding thickness can be as thick as possible to isolate signals. However, this introduces a complication of causing weight issues as the PCB will become too heavy.
- the metal ground plane in the shielding system (100) is.1.2mm thickness.
- This separation of signal on a common cable (104) is able to solve multi-module solution from various vendors as there are less shielding components used, thereby reducing compatibility issues between multiple components.
- the cable (104) used is a Radio Frequency (RF) cable that is fully shielded and grounded.
- RF Radio Frequency
- the positioning of the wireless modules (101,103) is designed to suit various needs such as fitting a specific form factor, easy installation and spaced far apart enough to prevent any crosstalk in signals.
- the methods and system described are intended to cater for reducing electromagnetic interference issues for high and low power output transmission such as from 18 to 30 (decibel-milliwatt) dBm. Quality of service can be improved by reducing the interference and a providing a better reception and transmission as Low Noise Amplifiers (LNA) would have a better performance with less interference.
- LNA Low Noise Amplifiers
- the system and method described in Figure 3 allows WiMax (up to 3OdBm) and WiFi(18-23dBm) to be on the same module without interference.
- This invention is adapted for use with a variety of wireless modules.
- the shielding system and method can be used for preventing interference in any wireless applications.
- the disclosed invention is suitable, but not restricted to, for use in WiMax and WiFi systems.
Landscapes
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Noise Elimination (AREA)
- Near-Field Transmission Systems (AREA)
Abstract
A shielding system (100) is provided for controlling emission of electromagnetic interference from a plurality of wireless modules (101, 103) electrically connected to a printed circuit board (PCB), characterized in that, the system (100) includes a plurality of wireless modules (101,103) operational in at least two different frequencies, wherein the frequencies cause electromagnetic interference to one another, a plurality of metal casings positionable around the plurality of wireless modules (101, 103) wherein the plurality of metal casings shield electronic components of a wireless modules (101, 103) from said electromagnetic interference, wherein the wireless modules (101, 103) are connected to a metal ground plane.
Description
A SHIELDING SYSTEM FIELD OF INVENTION The present invention relates to a shielding system for controlling emission of electromagnetic interference from a plurality of wireless modules electrically connected to a printed circuit board (PCB).
BACKGROUND OF INVENTION
WiWi Generation 1.5 basically is the integration of WiFi a/b/g and 2.3 GigaHertz (GHz) WiMax which poses many complications during the development stage. Most of the solutions today focus on 3.5 GHz WiMax and 2.4 GHz at WtFi. The complication when integrating two products of very close frequency on a same device as this introduces interference and distorts signal quality. Low Noise Amplifiers (LNA) suffers from interference at both frequencies that are being used. This results in poor Quality of Service (QoS) which translates to less coverage and low data rate. These undesirable traits cause instability of devices where device needs to resend packets too frequently due to data loss.
High speed processors usually work with high speed buses arid high clock. These high speed transmission elements introduce strong electromagnetic interference that can possibly affect the performance of WiMax and WiFi systems. The problems usually start to occur when the processors at the main board begin operating at 166 MegaHertz (MHz) to 2 GHz.
Most existing systems combine WiFi and WiMax in Mini Peripheral Component Interconnect (MiniPCI) bus due to the standardized form factor issues that do not allow them to be integrated in any other method. Therefore it miniaturization of modules is an issue which causes the devices to support only a limited frequency range.
[Existing methods of shielding only using metal cases are good for performance but however, introduce an increase in cost of devices. Therefore, there is a need for a method or system to allow integration of multiple transmission standards such as WiMax and WiFi in order to improve frequency range in a cost effective manner.
SUMMARY OF INVENTION
Accordingly there is provided a shielding system for controlling emission of electromagnetic interference from a plurality of wireless modules electrically connected to a printed circuit board (PCB), characterized in that, the system includes a plurality of wireless modules operational in at least two different frequencies, wherein the frequencies cause electromagnetic interference to one another, a plurality of metal casings positionable around the plurality of wireless modules wherein the plurality of metal casings shield electronic components of a wireless modules from said electromagnetic interference, wherein the wireless modules are connected to a metal ground plane.
There is also provided a method for shielding wireless modules from emission of electromagnetic interference from a plurality of wireless modules electrically connected to a printed circuit board (PCB), characterized in that, the method includes positioning the wireless modules at a predetermined distance from one another such that the electromagnetic interference does not affect each other and placing a metal shielding around electronic components of each wireless module.
The present invention consists of several novel features and a combination of parts hereinafter fully described and illustrated in the accompanying description and drawings, it being understood that various changes in the details may be made without departing from the scope of the invention or sacrificing any of the advantages of the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS
The drawings constitute part of this specification and include an exemplary or preferred embodiment of the invention, which may be embodied in various forms. It should be understood, however, the disclosed preferred embodiments are merely exemplary of the invention. Therefore, the figures (not to scale) disclosed herein are not to be interpreted as limiting, but merely as the basis for the claims and for teaching one skilled in the art of the invention.
Figure 1 is a front view and a side view of a first embodiment of a shielding system; Figure 2 is a front view and a side view of a second embodiment of a shielding system; Figure 3 is a front view and a side view of a third embodiment of a shielding system.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a shielding system for controlling emission of electromagnetic interference from a plurality of wireless modules electrically connected to a printed circuit board (PCB). Hereinafter, this specification will describe the present invention according to the preferred embodiments of the present invention. However, it is to be understood that limiting the description to the preferred embodiments of the invention is merely to facilitate discussion of the present invention and it is envisioned that those skilled in the art may devise various modifications and equivalents without departing from the scope of the appended claims.
The following detailed description of the preferred embodiments will now be described in accordance with the attached drawings, either individually or in combination.
Figure 1 shows an embodiment of the invention which is a shielding system (100) for controlling emission of electromagnetic interference from a plurality of wireless modules (101, 103) electrically connected to a printed circuit board (PCB), where a plurality of wireless modules (101,103) operational in at least two different frequencies, wherein the frequencies cause electromagnetic interference to one another, a plurality of metal casings positionable around the plurality of wireless modules (101, 103) wherein the plurality of metal casings shield electronic components of a wireless modules (101, 103) from said electromagnetic interference, (101, 103) wherein the wireless modules (101, 103) are connected to a metal ground plane of the PCB.such that electromagnetic interference does not affect each other. An example of wireless modules (101, 103) used are WiFi and Worldwide Interoperability for Microwave Access (WiMax).
Figure 2 shows a second embodiment of the invention where a shielding system (100) for controlling emission of electromagnetic interference from a plurality of wireless modules (101, 103) electrically connected to a printed circuit board (PCB) is shown. The system (100) includes a plurality of wireless modules (101,103) operational in at least two different frequencies, wherein the frequencies cause electromagnetic interference to one another, a processor, wherein the processor is positionable between and of a predetermined distance from the plurality of wireless modules (101, 103), a plurality of metal casings positionable around the plurality of wireless modules (101, 103) wherein the plurality of metal casings shield electronic components of a wireless modules (101, 103) from said electromagnetic interference, wherein the wireless modules (101, 103) are positionable at a predetermined distance from each module (101, 103) such that electromagnetic interference does not affect each other. The system (100) in Figure 2 further includes a common cable (104) wherein the plurality of wireless modules (101, 103) are connectable to a transmitting or receiving means, such as an antenna, by the cable (104), wherein output from the plurality of wireless modules (101, 103) are transmitted and received digitally in the common cable (104). An example of wireless modules (101, 103) used are WiFi and WiMax. The cable (104) used may be up to 1 meter length and supports digital transmission such as Universal Serial Bus (USB), Secure Digital Input Output (SDIO) and Parallel Bus. However, the examples given herein are not limitative of the scope of the invention and may be extended to include more standards of transmission as required.
Figure 3 shows another embodiment where a shielding system (100) for controlling emission of electromagnetic interference from a plurality of wireless modules (101 , 103) electrically connected to a printed circuit board (PCB), where a plurality of wireless modules (101,103) operational in at least two different frequencies, wherein the
frequencies cause electromagnetic interference to one another, a processor, wherein the processor is positionable between and of a predetermined distance from the plurality of wireless modules (101 , 103), a plurality of metal casings positionable around the plurality of wireless modules (101, 103) wherein the plurality of metal casings shield electronic components of a wireless modules (101, 103) from said electromagnetic interference, wherein the wireless modules (101, 103) are positionable at a predetermined distance from each module (101, 103) such that electromagnetic interference does not affect each other. An example of wireless modules (101, 103) used are WiFi and WiMax. A method for shielding wireless modules (101, 103) from emission of electromagnetic interference from a plurality of wireless modules (101, 103) electrically connected to a printed circuit board (PCB) is also described in that the method includes positioning the wireless modules (101, 103) at a predetermined distance from one another such that the electromagnetic interference does not affect each other and placing a metal shielding around electronic components of each wireless module (101 , 103) as seen in Figure 3.
A second method for shielding wireless modules (101, 103) from emission of electromagnetic interference from a plurality of wireless modules (101, 103) electrically connected to a printed circuit board (PCB) is also described in that the method includes placing a metal shielding around electronic components of each wireless module (101, 103) a wherein the wireless modules (101, 103) are connected to the metal ground plane of the PCB as seen in Figure 1. The metal ground plane prevents crosstalk between any components in both modules. Optimum metal shielding thickness can be as thick as possible to isolate signals. However, this introduces a complication of causing weight issues as the PCB will become too heavy. The metal ground plane in the shielding system (100) is.1.2mm thickness.
Another method for shielding wireless modules (101,103) from emission of electromagnetic interference from a plurality of wireless modules (101, 103), characterized in that, the method includes positioning the wireless modules (101, 103) at a predetermined distance from one another such that the electromagnetic interference does not affect each other, placing a metal shielding around electronic components of a wireless module (101, 103) and connecting to a transmitting or receiving means by one common cable (104), wherein output from the plurality of wireless modules (101, 103) are transmitted and received digitally in the common cable (104) as seen in Figure 2. This separation of signal on a common cable (104) is able to solve multi-module solution from various vendors as there are less shielding components used, thereby reducing compatibility issues between multiple components. The cable (104) used is a Radio Frequency (RF) cable that is fully shielded and grounded. The positioning of the wireless modules (101,103) is designed to suit various needs such as fitting a specific form factor, easy installation and spaced far apart enough to prevent any crosstalk in signals.
The methods and system described are intended to cater for reducing electromagnetic interference issues for high and low power output transmission such as from 18 to 30 (decibel-milliwatt) dBm. Quality of service can be improved by reducing the interference and a providing a better reception and transmission as Low Noise Amplifiers (LNA) would have a better performance with less interference. The system and method described in Figure 3 allows WiMax (up to 3OdBm) and WiFi(18-23dBm) to be on the same module without interference.
This invention is adapted for use with a variety of wireless modules. The shielding system and method can be used for preventing interference in any wireless applications. The disclosed invention is suitable, but not restricted to, for use in WiMax and WiFi systems.
Claims
1. A shielding system (100) for controlling emission of electromagnetic interference from a plurality of wireless modules (101, 103) electrically connected to a printed circuit board (PCB), characterized in that, the system (100) includes:
a plurality of wireless modules (101,103) operational in at least two different frequencies, wherein the frequencies cause electromagnetic interference to one another;
a plurality of metal casings positionable around the plurality of wireless modules (101, 103) wherein the plurality of metal casings shield electronic components of a wireless modules (101, 103) from said electromagnetic interference,
wherein the wireless modules (101 , 103) are connected to a metal ground plane.
2. A shielding system (100) for controlling emission of electromagnetic interference from a plurality of wireless modules (101, 103) electrically connected to a printed circuit board (PCB), characterized in that, the system (100) includes:
a plurality of wireless modules (101,103) operational in at least two different frequencies, wherein the frequencies cause electromagnetic interference to one another;
a processing means, wherein the processing means is positionable between and of a predetermined distance from the plurality of wireless modules (101, 103);
a plurality of metal casings positionable around the plurality of wireless modules (101, 103) wherein the plurality of metal casings shield electronic components of a wireless modules (101, 103) from said electromagnetic interference,
wherein the wireless modules (101, 103) are positionable at a predetermined distance from each module (101, 103) such that electromagnetic interference does not affect each other.
3. The shielding system (100) as described in claim 2, wherein the plurality of wireless modules (101, 103) are connectable to a transmitting or receiving means by one common cable (104), wherein output from the plurality of wireless modules (101, 103) are transmitted and received digitally in the common cable (104).
4. The system (100) as described in claim 3, wherein the wireless modules (101, 103) are WiFi and WiMax modules.
5. A method for shielding wireless modules (101, 103) from emission of electromagnetic interference from a plurality of wireless modules (101, 103) electrically connected to a printed circuit board (PCB), characterized in that, the method includes positioning the wireless modules (101, 103) at a predetermined distance from one another such that the electromagnetic interference does not affect each other and placing a metal shielding around electronic components of each wireless module (101, 103).
6. The method as claimed in claim 5, wherein the wireless modules (101, 103) are connected to the metal ground plane of the PCB.
7. A method for shielding wireless modules (101,103) from emission of electromagnetic interference from a plurality of wireless modules (101, 103), characterized in that, the method includes positioning the wireless modules (101, 103) at a predetermined distance from one another such that the electromagnetic interference does not affect each other, placing a metal shielding around electronic components of a wireless module (101, 103) and connecting to a transmitting or receiving means by one common cable (104), wherein output from the plurality of wireless modules (101, 103) are transmitted and received digitally in the common cable (104).
8. The method as described in claim 6 and 7, wherein the wireless modules (101, 103) are WiFi and WiMax modules.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| MYPI20097014A MY155588A (en) | 2009-08-21 | 2009-08-21 | A shielding system |
| MYPI20097014 | 2009-08-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2011021925A1 true WO2011021925A1 (en) | 2011-02-24 |
Family
ID=43838287
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/MY2010/000149 Ceased WO2011021925A1 (en) | 2009-08-21 | 2010-08-20 | A shielding system |
Country Status (2)
| Country | Link |
|---|---|
| MY (1) | MY155588A (en) |
| WO (1) | WO2011021925A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116260479A (en) * | 2021-12-10 | 2023-06-13 | 通用汽车环球科技运作有限责任公司 | Powertrain system with wireless communication node and integrated RF shielding guide layer |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070273602A1 (en) * | 2006-05-23 | 2007-11-29 | Research In Motion Limited | Mobile wireless communications device with reduced interfering rf energy into rf metal shield secured on circuit board |
| US20090032300A1 (en) * | 2007-08-01 | 2009-02-05 | Flextronics Ap, Llc | Method of and apparatus for providing an RF shield on an electronic component |
-
2009
- 2009-08-21 MY MYPI20097014A patent/MY155588A/en unknown
-
2010
- 2010-08-20 WO PCT/MY2010/000149 patent/WO2011021925A1/en not_active Ceased
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070273602A1 (en) * | 2006-05-23 | 2007-11-29 | Research In Motion Limited | Mobile wireless communications device with reduced interfering rf energy into rf metal shield secured on circuit board |
| US20090032300A1 (en) * | 2007-08-01 | 2009-02-05 | Flextronics Ap, Llc | Method of and apparatus for providing an RF shield on an electronic component |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116260479A (en) * | 2021-12-10 | 2023-06-13 | 通用汽车环球科技运作有限责任公司 | Powertrain system with wireless communication node and integrated RF shielding guide layer |
Also Published As
| Publication number | Publication date |
|---|---|
| MY155588A (en) | 2015-11-03 |
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