TY - RPRT
A1 - Basiana, Ariadna Farres
A1 - Martinsson, Hanna
A1 - Vik, Brage Ofstad
A1 - Pereverzyev, Sergiy
A1 - Purrucker, Martin
A1 - Schmitz Abe, Klaus Erich
A1 - Stiel, David
A1 - Strautins, Uldis
T1 - Frequency Filtering in Telecommunications
N2 - Piezoelectric filters are used in telecommunication to filter electrical signals. This report deals with the problem of calculating passing and damped frequency intervals for a filter with given geometrical configurations and materials. Only periodic filters, which are widely used in practice, were considered. These filters consist of periodically arranged cells. For a small amount of cells a numerical procedure to visualise the wave propagation in the filter was developed. For a big number of cells another model of the filter was obtained. In this model it is assumed that the filter occupies an infinite domain. This leads to a differential equation, with periodic coefficients, that describes propagation of the wave with a given frequency in the filter. To analyse this equation the Spectral Theory for Periodic Operators had to be employed. Different ways -- analytical and numerical -- to apply the theory were proposed and analysed.
KW - eigenvalue problems
KW - piezoelectric periodic surface acoustic wave filters
KW - SAW filters
KW - wave propagation
Y1 - 2004
UR - https://kluedo.ub.uni-kl.de/frontdoor/index/index/docId/1625
UR - https://nbn-resolving.org/urn:nbn:de:hbz:386-kluedo-16259
ER -