Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990stin...9116251s&link_type=abstract
Thesis - Siegen Univ. Max-Planck-Inst. für Radioastronomie, Bonn (Germany, F.R.).
Astronomy and Astrophysics
Astronomy
Dielectric Properties, Mathematical Models, Microstrip Transmission Lines, Radio Astronomy, Wave Equations, Waveguides, Bandwidth, Computer Programs, Electromagnetic Fields, Low Temperature, Radio Filters, Radio Receivers
Scientific paper
A microstrip transmission line immerged in a special wave guide was analyzed. Filters for radio astronomical receivers are to be built using this special microstrip transmission line. The waveguide shape is such that its mechanical stability be guaranteed at low temperatures. For the field development, the non dissipation of dielectrics, and of the conductor, were taken as unique approximation. A method was found to describe analytically the electromagnetic field in the wave guide, which can be demounted in homogeneous rectangular subdomains, where the wave equation is to be solved in closed form. It gives an homogeneous equation system of the form MP equals zero, where P is an unknown split vector. A program was developed in this way. The solutions found were graphically represented as dispersion diagrams. The cut off frequencies of the higher mode are exactly determined. This is important for the filter development, in order to determine the effective bandwidth.
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