BandSorb-SC used at 24.5 GHz

Cavity resonance suppression at 24.5 GHz Introduction: Modern electronic devices are working at increasing frequencies and require a high level of separation of signals for different parts of the device. Failing to provide the correct level of separation will lead to an underperforming system. Typically shielding is used to separate the different parts of the circuit. The lack of sufficient foot print to separate the different parts and the occurrence of cavity resonance can put the use of shielding to its limits. A short range automotive radar working at 24 GHz is a typical example of such a system....... Read More

Date:  31-10-2018Category:  Usage

Characterization of EMI shielding gaskets

Schlegel Electronic Materials (SEM) is an active member of the IEEE P1302 Committee .This working group is in charge of the review of the methods to characterize Conductive gasket from DC to 40 GHz. Hereafter is a brief description of the main methods in use at SEM.Mil DTL 83528 C.This aperture attenuation method derived from the former Mil Std 285/IEEE 299 characterizes the shielding effectiveness (SE) of the gasket from 20 MHz to 10 GHz . The test set-up consist of a shielded room with an opening of 610/610 mm (24”/24”) with one emitting antenna outside and a receiving antenna inside the room and two meters distance between antennas...... Read More

Date:  05-01-2016Category:  Method

Restriction of Hazardous Substances in Electrical and Electronic Equipment (EEE)

RoHS 1 DIRECTIVE 2002/95/EC RoHS 2 DIRECTIVE 2011/65/EU Supersedes RoHS 1 since Jan. 2, 2013 The RoHS 2 Directive prevents all EEE placed on the European market from containing more than 0.1 % of Pb (Lead), 0.1% of Hg (Mercury), 0.01% of Cd (Cadmium), 0.1% of CrVI (Hexavalent Chromium), 0.1% of PBB (Polybrominated biphenyls) and 0.1 % of PBDE (Polybrominated diphenil ethers). Compliance of equipment with the RoHS 2 directive is required before the placement of CE mark and must be clearly mentioned in the Declaration of Conformity by the manufacturer of the equipment. The RoHS 2 requirements apply to equipment/end products that fall within the scope of the directive. Components such as EMI shielding gaskets are not covered by the scope of the directive. However, for the final product to be compliant, it is obvious that each of its components must ensure that restricted substances are within the admissible concentration values..... Read More

Date:  16-11-2015Category:  Regulation

DynaShear / DynaGreenTM Selecting the right profile

Schlegel Electronic Materials (SEM) introduces DYNASHEAR TM and DYNAGREEN TM an innovative EMI shielding gasket family for the shielding of modules in card/cages environment that is able to offer superior features over metal fingerstocks and current Fabric-Over-Foam gaskets . DYNASHEAR TM and DYNAGREEN TM utilize the bump technology that result from a three axis development program : - SEM famous special flat D-Profiles with bump. - Low memory ultra soft foam type 7. - Abrasion resistant conductive fabrics...... Read More

Date:  21-10-2015Category:  Usage

SEM‘s Gaskets attachment options

1. Pressure Sensitive Adhesive (PSA) The most popular attachment method is the Pressure Sensitive Adhesive (PSA). Standard PSA are non conductive and are dimensioned to not cover the entire gasket surface to ensure direct electrical contact. The constraints applied on the adhesive vary in large proportions depending on the type of application. There are limited constraints for static applications because the adhesive is just there to hold the gasket the time before it will be compressed. At the contrary, for dynamic applications, constraints increase and especially when forces are exerted in the horizontal axis (for ex. during blade or module insertion) which tends to push the gasket. Schlegel Electronic Materials has selected 3M acrylic based adhesives with high shear strength values* to guarantee adhesions even in the most challenging dynamic applications...... Read More

Date:  05-10-2015Category:  Usage

Non Conductive PSA (Pressure Sensitive Adhesive) Versus Conductive PSA

Influence of conductive (D) and non conductive (R) adhesive on Shielding effectiveness for Fabric-Over-Foam gaskets Schlegel Electronic Materials recommends the use of non conductive adhesives in most cases (type R).All gaskets have a PSA width recommended according to the width of the profile to ensure sufficient direct contact at the bottom of the gasket with the application. Test was carried out according to SAE ARP 6248 (stripline method) on EW8 (9/3 mm) in order to measure the influence of non conductive PSA ( 2.5 mm and 4.5 mm wide) and conductive PSA ( 8 mm wide) .Three profiles were tested compressed at 50% up to 40 GHz ...... Read More

Date:  18-09-2015Category:  Usage