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Cap for EMF pro­tec­tion (ideal mate­r­ial)

There are lot of clothes in mar­ket to pro­tect sen­si­tive humans from elec­tro­mag­netic fields (EMF). One of the main organ to pro­tect is brain. Do it works? Does cap pro­tects brain against elec­tro­mag­netic fields? As I am not elec­tro­mag­netic field sen­si­tive and I am not sit­u­ated good enough to buy and test these caps, I can­not answer this ques­tion for sure with 100% cer­tainty. As the­o­ret­i­cal sci­en­tist and elec­tro­mag­netic com­pat­i­bil­ity engi­neer (EMC) involved in test­ing of shield­ing mate­ri­als, mea­sure­ments of elec­tro­mag­netic devices, 3D mod­el­ling of com­plex elec­tro­mag­netic sit­u­a­tions, I’ve knowl­edge to mea­sure and model.

Read more: Cap for EMF pro­tec­tion
Cable through shielded enclo­sure wall

Shielded con­tainer can be suc­ces­sively used as pro­tec­tion against elec­tro­mag­netic fields, elec­tro­mag­netic pulses cre­ated by light­ning and nuclear elec­tro­mag­netic pulses. But one of the most crit­i­cal part, beside doors and ven­ti­la­tion aper­tures, is cabling to pro­vide power and com­mu­ni­ca­tions inside con­tainer. In shield­ing indus­try this sit­u­a­tion is usu­ally solved by using feedthrough fil­ter at the cable entry. In this way cable is fil­tered and no fields should pen­e­trate inside the con­tainer (depends on feed through fil­ter para­me­ters).
Read more: Con­tainer shield­ing

Shielded cable pig­tail elec­tro­mag­netic field visualization

CST 500 no opt“Pig­tail” is short wire cre­ated by twist­ing cable shield­ing at the end of shielded cable. Good EMC engi­neer­ing praxis is– con­nect shield­ing in 3600 ter­mi­na­tion. But not always elec­tronic engi­neers, com­pli­ance engi­neers etc. take care of proper ter­mi­na­tion. There­fore, it leads to fails in EMC test­ing lab. There are few prac­ti­cal papers devoted to this topic. In EMC con­fer­ence prac­ti­cal ses­sions this topic is pointed out a lot. There are few the­o­ret­i­cal papers regard­ing proper shielded cable ter­mi­na­tion to pass EMC test­ing in elec­tro­mag­netic com­pat­i­bil­ity lab.

Read more: EMC draw­back of shielded cable pig­tail

Tex­tiles for shield­ing elec­tro­mag­netic fields (realy shielding?)

In marked there are lot of tex­tile promis­ing to pro­tect from Elec­tro­mag­netic fields (EMF). There are bunch of sites sell­ing them. All of tex­tiles are char­ac­ter­ized like: shield­ing in dB, con­duc­tive sur­face Ohm/​square, pro­tec­tion 99.5%, pro­tects from EMF, etc. But there are only few prod­ucts that are really tested and only frac­tion of them are tested using valid/​standardized methods.

Read more: Shield­ing tex­tile mate­ri­als
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