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USB EMI Filters
The FOIL™ USB filters utilize Patent Pending technology and are the only EMI/RFI filters on the market for USB 2.0 applications that offer 100dB performance from 10kHz to 10GHz and higher. Housed in a single, convenient filter package, FOIL™ USB Filters are the easiest and most reliable solution for bringing USB 2.0 communication to all varieties of shielded rooms and enclosures.
Standard signal line filters rely on capacitors and inductors to eliminate unwanted RF signals. However, these types of filters often eliminate the high frequencies that make up the sharp edges of high speed digital square wave signals thereby degrading the integrity of the signal. In order to avoid this side effect, it is necessary for standard signal line filters to have extended passbands that allow the higher frequencies to pass unimpeded. Even the best standard USB filters offer only 60dB from 1GHz to 6GHz. Also, it is important to note that standard signal line filters do not differentiate between USB signals and undesirable signals. They act like a "hole" in the shielded enclosure to all signals - good and bad - within the passband.
Unlike standard signal line filters, FOIL™ USB Filters utilize a fiber optic isolation link (FOIL) to maintain 100dB shielding integrity. The filter converts ONLY USB signals, so there is no passband and no transmission of unwanted signals.
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Customization
FOIL™ brand USB filters can be modified to meet specific customer requirements. If you need a USB filter for a military or harsh environment or require customized housings or functions, please contact us to discuss your application.
Typical Performance
Shielding Effectiveness*
100dB from 10kHz to 10GHz
Insertion Loss*
100dB from 10kHz to 10GHz
Radiated Emissions*
FOIL USB filters are active filters and produce radiated emissions inside the shielded enclosure. Please contact DJM Electronics for information regarding your particular application.
Environmental
Operating Temperature: 0ºC - 50ºC (32ºF - 122ºF)
Humidity: 20% - 80% (non condensing)
*Note
These results reflect preliminary tests. Full production units are not yet available
Communication Performance
Compatibility
Compatible with USB 1.1 Low-Bandwidth (1.5Mbps), Full-Bandwidth (12Mbps) and USB 2.0 Hi-Speed (480 Mbps). Operates with USB 2.0 high-speed host controllers and USB 1.1 classic hosts.
Supported Data Connections
Supports all USB device communication transfers: Control, Interrupt, Bulk and Isochronous up to 480Mbps.
Supported Operating Systems
Supports Windows®, Mac OS®, and Linux®. No new driver installation required.
Power Output
5VDC, 500mA available at output connector
Connectors
Input connector: USB-A Receptacle (Female)
Output connector: USB-A Receptacle (Female)
Construction
Filter Housing
- 12 ga zinc plated cold rolled steel
- 1" NPT threaded penetration w/brass mounting flange nut and mesh gasket
Power Requirements
- Input: 100-240VAC; 50/60Hz
- Output: +5V / 2000 mA maximum
- DC plug type: center positive
Dimensions
10.00" x 4.50" x 3.00" with 3" threaded penetration (1" NPT)
Drawings
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