What does the “+” indicate in Quell’s next generation line of filter inserts?
In a nutshell, EESeal+® can tackle more difficult interference problems than standard-issue Quell filters.
New electronic device designs might sometimes display unusual electromagnetic behavior that contains outliers in terms of peak frequency strength or noise across a wide spectrum. The complexity of multiple interference problems occuring at the same time also makes it harder to mitigate emissions below compliance thresholds.
Like the standard EESeal offerings, Quell’s patented EESeal+ technology uses miniaturized filter components embedded into a silicone rubber insert that matches the size, shape, and pin configuration of a standard connector.
EESeal+ inserts employ an exceedingly high-dielectric-constant silicone that creates a small capacitor with virtually no inductance. The insert can be deployed singly or combined with a discrete device to attack both higher and lower frequencies. Such methods can expand filtering capability to frequencies up to 100GHz.
New Gains in Performance
Let’s delve into the sizable gains EESeal+ technology has made in EMI mitigation:
Lower contact resistance
Due to an improved ground plane, the new EESeal+ inserts reduce contact resistance, which minimizes power loss and enhances signal integrity, achieving better conductivity through the connector.
Lowering inductance in the filter inserts preserves signal integrity and reduces power losses and additionally contributes to the boost in EMI mitigation effects we see in EESeal+ technology.
Attenuation of peak frequencies up to 50dB
The original, standard-issue EMI filter inserts from Quell could typically bring down the strength of peak frequency emissions up to 42dB. With EESeal+, the filtering is more robust, with the ability to block out higher energy frequencies.
Larger window of frequency mitigation from 20 to 40GHz
Not only is the magnitude of spikes attenuated, EESeal+ technology captures a wider spectrum of possible noise, dampening frequencies as low as 20GHz and as high as 40 GHz.
Near negligible nominal resistance
Improvement in nominal resistance in the new line of filter inserts is another example of maintaining high quality of power and signal through the connector while mitigating unwanted EMI. EESeal+ technology now achieves nominal resistance values below a threshold of 150 milliohms.
Choice of discrete or integral capacitors depending on design needs
Discrete capacitors give engineers flexibility in designs where capacitance values and voltage ratings need to be controlled. Integral capacitors are favored where enhanced signal integrity and reduced parasitic effects are paramount. Each EESeal+ filter insert can be customized according to the functionality of your connector pins.
Whether in the context of a Combo D-Sub or a circular coaxial or other standard connector, users can specify which filter elements are required for each pin, allowing for the creation of a completely custom filter insert with widely varying capacitor values. Custom samples of EESeal+ inserts for testing can be fabricated and shipped in less than 24 hours and are free of charge.
The customized silicone discs with embedded 3D electronics can be inserted into standard connectors in seconds without the need for any special tooling or soldering. The addition of the insert not only integrates an effective EMI filter, but also produces a durable, long-lasting environmental seal. Customization can also incorporate transient voltage suppression (TVS) functionality.
Since both EESeal and EESeal+ 3D designs use silicone instead of a printed circuit board (PCB) mounting or brittle planar ceramic array construction, they are far easier to integrate into new devices ad hoc or post hoc than traditional EMI filters. The solutions do not risk violating applicable MIL standards for spacing, conformal coating, and pad size.
When to Use EESeal+
When should you reach for an EESeal+ solution?
Since interference profiles are unique to each electronics project, the answer can usually be found during prototype testing. Often engineering teams “try on” of a variety of connector filter samples that target the frequency range of interference and other desirable functionality. They then select the insert that achieves the best balance of mitigation and signal attributes.
Quell recommends that engineers try standard EESeal products first, especially if interference patterns appear moderate. For more extreme EMI cases, or for the extra design capabilities mentioned above, EESeal+ filter inserts may be the solution you’re looking for.
Experts are always available to assist and help you find the right combination of custom filter traits to match your specific interference issue. Quell has a worldwide network of knowledgeable reps and responsive online support to guide you towards a customized EESeal+ solution.