Image Gallery

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RF Tutorial Package

Evanescent Mode Cylindrical Cavity Filter

Evanescent Mode Cylindrical Cavity Filter

An evanescent-mode cavity filter is resonant at a frequency lower than its original fundamental-mode frequency that can be brought about by creating a discontinuity inside the cavity. The electric field and S-parameter analysis in this example show that this discontinuity – the dielectric tube inside the cavity -- does not significantly distort the signal.

Radome

Radome

A radome minimizes losses and improves radiation characteristics of an antenna through its design. Shown is the surface current density on the patch antenna, the magnitude of the electric potential on the antenna's substrate, and the electric field in the radome's shell. The plot at the bottom left shows the far-field radiation pattern.

Microstrip Filter

Microstrip Filter

Microstrip filters can be fabricated directly on a printed circuit board with a microstrip line going from the input to the output. Along the microstrip line there are a number of stubs of certain lengths and widths. The design of the filter involves choosing the impedance of the microstrip line, the impedance of the stub microstrips, and the length of the stubs. The filter above has a seventh-pole low-pass Chebyshev response. The entire layout with dielectric layer was imported from an ODB++(X) file using the COMSOL RF Module's ECAD Import feature. Since the filter is sensitive to the placement and length of the stubs, the RF Module solved this model by also analyzing the change in filter characteristics as a function of mechanical deformation.