Shielded Air Vent Honeycomb Filters

Note: The shielding specified (in dB) is typical of the data we have obtained. Results may vary depending on application.

W = Honeycomb panel cell width = 1/8” standard. Other cell sizes are available through special order.
T = Panel Thickness as shown above. The filter thickness will double for 2 panel configurations.

Custom and RoHS compliant Honeycomb Filters are available on request. Contact us for more information.

DESIGN ADVANTAGES (ALL TYPES)

Due to their construction and materials, our honeycomb filters offer several cost-effective advantages over the other honeycomb filters on the market.

COMPETITIVE COST

A fully automated machine is used to cut the frame to size. This machine is coupled with several automated and semi-automated processes used to apply epoxy to the frame/honeycomb panel interface for mechanical strength of the filter, and to install the electromagnetic (EM) bonding spiral gasket to the extrusion. These machines and processes significantly reduce the time required to manufacture and assemble the filters, and we pass that savings on to our customers.

SHIELDING ADVANTAGE

The honeycomb panels we use offer high, reliable levels of shielding. The Brass-Cell uses brass foils soldered together which provide extremely high, reliable shielding. The aluminum panels used for Spira-Cell filters are processed using our patented blending process that ensures a reliable conductive path across the epoxy joints of the honeycomb cells. Tests have shown as much as a 40 dB improvement for single panel filters and 70 dB improvement for double panel filters over the use of panel material which has not been processed. See pages 29 and 32 for complete performance data.

RELIABLE JOINT SURFACES

We use 6061 aluminum for our frame members because of its high surface conductivity and corrosion resistant properties. We augment this with tin or tin/lead plating (when specified) to meet higher levels of shielding and/or corrosion compatibility requirements. Chemical film plating can also be employed when the high levels of shielding associated with tin plating are not required. Any plating is done prior to assembly which guarantees that the acids and other chemicals used in the pre-plating etch process are totally removed from the components, thus ensuring a long, reliable life of the filter.

SPIRAL BONDING

Spira EMI gasket materials are used to obtain an excellent, reliable frame-to-chassis bond on all types of filters. The gaskets are also employed for the honeycomb panel-to-frame electromagnetic bond on the Spira-Cell and Brass-Cell filters. The spiral gaskets are employed for the purpose of absorbing thermal expansion and contraction, shock, and vibration to insure an excellent electromagnetic bond throughout the life of the filter.