ABSTRACT This thesis presents the equivalent circuit of basic semicondonductor equations, which are implemented as the device elements of circuit simulator: spice3. We use a simple example of a pn junction diode to study the DC and transient characteristics. Using this technique, it is easy to simulate the semiconductor device composed of the elements and to include the semiconductor device as a part of a circuit.

This master’s thesis deals with modelling of the planar coupling circuits, namely type of the wideband couplers and the ultra-wideband couplers. The purpose of this thesis is an analysis, a synthesis, a numerical modelling and a fabrication (only chosen types) of the presented couplers. All of the couplers works on medium frequency f0 = 7 GHz with coupling C = 3 dB. Types of the substrate are Arlon 25N and Arlon AD600. EM simulator IE3D and circuit simulator in program Ansoft Designer are used for the numerical modelling. The realized wideband couplers were measuring by the vector analyzer Agilent E3864B.