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At Captor Corp., we are the experts in electromagnetic interference. We custom design EMI filter solutions to meet the exact specifications of your application, usually more cost effectively than most competitors’ catalog items. With more than 10,000 designs completed to date, we have the proven capability of delivering high reliability electromagnetic, power line, signal line, and TEMPEST filters for military, aerospace, commercial, and industrial applications.EMI Filters

In any chassis configuration imaginable, and with a choice of multiple termination interfaces, we build standard filter solutions rated 0-400 VDC, 0-480 VAC, 0-400 A, and DC-400 Hz, with higher voltages, currents, and frequencies readily available on request. Our services include filter circuit design and analysis, packaging design and layout, and quick turnaround prototyping.

Our engineering support extends from project inception to completion, and includes extensive qualification, environmental, and acceptance test procedures to ensure all filters meet applicable specifications.

To learn more about our custom EMI filter solutions, read below, or contact us today to discuss how we can help you with your application.

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To better understand the importance of EMI filters, it is important to understand what EMI is and the types of EMI that Captor filters are designed to eliminate. Simply put, EMI (electromagnetic interference) is any noise or electrical signal that has the potential to cause the disruption of an electrical signal. The effects of EMI may present themselves as something innocuous as static heard in a radio transmission, to something as serious as a weapon systems malfunction. There are many types of EMI that require different filtering solutions. Knowing what they are simplifies the process of source identification.

Conducted EMI is interference flowing through any conductor or wire; in this type of EMI, the interference is caused by physical contact of conductors or wires.

Common Mode EMI is typically associated with higher frequencies; in this type of EMI, the interference will flow in the same direction across a single or many conductors.

Differential EMI is mostly found in lower frequencies; this type of interference is the result of one affected conductor coupling EMI to adjacent conductors. It can flow in opposite directions, which may cause signals to cancel each other out.

Radiated EMI, as its name implies, is transmitted; these magnetic or electrical fields flow through the air much like radio waves from an antenna. They are the most common form of EMI and created by virtually any electronic or electrical device.

The pervasive nature of EMI cannot be understated; that’s why proper filtering is critical as EMI can originate from multiple sources. This is a short list of possible EMI sources that can benefit from filtering:

  • Power supplies
  • Generators
  • Ignition systems
  • Motors
  • Voltage regulators
  • Switches, relays
  • Oscillators
  • Power transmission lines
  • Computing devices
  • Battery chargers
  • Radios
  • Radar
  • Sonar

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General Capabilities

Custom
Build to Print

Process

Design
Engineering
Layout
Manufacturing
Assembly
Testing
Verification
Consulting
Prototyping
Research and Development

Equipment

Automated
Manual

Components

Inductors
Capacitors
Resistors
Relays
Diodes
Chokes
Varistors

Termination Interfaces

Threaded Terminals
Solder Terminals
Connectors
Wire Leads
Wire Harnesses

Connectors

Military
Commercial

Protection

Circuit
HEMP/EMP
Transient Voltage

Insertion Loss / Attenuation

0 to 100 dB

Voltage Rating

0 to 400 VDC
0 to 480 VAC
Higher Voltage rating available upon request

Current

0 to 400 Amps
Higher Currents available upon request

Frequency

DC to 400 Hz
Other frequencies available upon request

Typical Operating Temperature

-55 to +71 °C

Typical Storage Temperature

-55 to +105 °C

Standards

MIL-STD-461
MIL-PRF-15733
MIL-STD-202
MIL-STD-220

Chassis Material

CRS, Brass, Aluminum, Stainless Steel

Configurations

Single L
Single Pi
Double L
Double Pi

Inspection

100% Test
Visual
AQL

Testing

Altitude
Temperature Cycling
Shock
Vibration
Electrical
Mechanical
Environmental

Quality Control

Test Plan
Test Report

Secondary Operations (In-House)

Assembly
Machining
Forming
Bending
Welding
Quick Turn Prototypes

Production Volume

Prototype to Large Scale Production Runs

Typical Lead Times

1 week (Stock)
10 to 12 weeks (Custom)
1 to 3 weeks (Prototypes)

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Industry Focus

Electrical
Electronic
Military
Aerospace
Commercial

Industry Standards

AS9100 Rev C
ISO 9001:2008
IPC 610
J-STD-001

File Formats

SolidWorks
AutoCAD
PCAD (Circuit Boards)