Electromagnetic Interference from GSM, DECT and WCDMA terminals on Products and Test equipment at CPS
Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
RF-störningar i tillverkninssystemet hos CPS (Swedish)
Core Production Stockholm (CPS) manufactures products for base stations such as filters, combiners, power amplifiers etc. Many of the products cover the same frequencies that are used for communication in GSM, WCDMA and DECT terminals. Employees at CPS have been provided with DECT phones while there have been restrictions in the use of mobile phones to avoid the risk of interference. It has however not been clear which impact the phones actually have, and therefore this study was conducted. As a starting point a sensitivity analysis method was developed, in order to reduce the enormous amount of combinations of products, interferers and tests. Using this method, the risks of electromagnetic interference (EMI) were analyzed, relevant combinations were chosen and experiments were done on real products and test equipment. As a result it was concluded that the immunity in general terms was good. However, the phones affected some test points, which clearly showed that the interference risk is real and need to be continuously considered. Suggestions that decrease the risk of interference have been given in this report. An in-building solution, would because of power control result in lower output power in GSM and WCDMA. DECT doesn’t have power control and is more expensive for CPS. As a consequence, WCDMA and GSM are proposed instead of DECT.
Place, publisher, year, edition, pages
2005. , 42 p.
Computer and Information Science
IdentifiersURN: urn:nbn:se:kth:diva-28069OAI: oai:DiVA.org:kth-28069DiVA: diva2:383915
Zander, Jens, Professor