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Suchen Sie über die Schnellsuche nach Tutorials und Applications, die für Ihr Fachgebiet relevant sind. Um die MPH-Dateien herunterzuladen, melden Sie sich an oder erstellen Sie einen COMSOL Access Account, der mit einer gültigen COMSOL-Lizenz verknüpft ist. Beachten Sie, dass viele der hier vorgestellten Beispiele auch über die Application Libraries zugänglich sind, die in die COMSOL Multiphysics® Software integriert und über das Menü File verfügbar sind.
Modeling a Biconical Antenna for EMI/EMC Testing
Biconical antennas are popular for very high frequency (VHF) measurement because they support a wide frequency range. They are also useful for electromagnetic compatibility (EMC) testing where the antenna can be used as an RF source in susceptibility or immunity test. This model ... Mehr lesen
Fast Prototyping of a Butler Matrix Beamforming Network
A Butler matrix is a passive beamforming feed network. It is a cost-effective feed network for phased array antennas because the circuit can be fabricated in the form of microstrip lines and is a viable solution for performing beam scanning without deploying expensive active devices. ... Mehr lesen
Evanescent Mode Cylindrical Cavity Filter
An evanescent-mode cavity filter is resonant at a frequency lower than its original fundamental mode frequency. Evanescent mode resonance can be realized by creating a discontinuity or reactance inside the cavity. The basic model was modified by the addition of a metal box at either ... Mehr lesen
Sierpinski Fractal Monopole Antenna
A fractal is a mathematical form showing self-repeating patterns. By virtue of its geometrical properties, a fractal structure can generate multiple resonances in RF applications. This antenna model uses a 3rd order Sierpinski triangle and the calculated S-parameters shows good input ... Mehr lesen
Microwave Filter on PCB with Stress (ODB++, ECAD Import)
Microstrip filters can be fabricated directly on a printed circuit board (PCB) 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 ... Mehr lesen
Thermal Drift in a Microwave Cavity Filter
Microwave filters are used to eliminate unwanted frequency components in the output from microwave transmitters. They are typically inserted between a power amplifier and an antenna. The amplifiers are nonlinear and produce harmonics that must be eliminated with filters that have a ... Mehr lesen
Quarter-Wave Transformer
Transmission lines are used when the frequency of the electromagnetic signals is so high that the wave nature of the signals must be taken into account. A consequence of the wave nature is that the signals are reflected if there are abrupt changes of the characteristic impedance along ... Mehr lesen
Simulating a Corrugated Waveguide and Its Impedance
This example exemplifies how to model the impedance of a waveguide of varying cross sectional area. A more detailed description of the phenomenon and the modeling process can be seen in the blog post "[Computing the Impedance of a Corrugated Waveguide](https://www.comsol.com/blogs/computing-impedance-corrugated-waveguide/) ... Mehr lesen
Filter Characterized by Imported S-Parameters via a Touchstone File
A Touchstone file describes the frequency responses of an n-port network circuit in terms of S-parameters. This can be used to simplify arbitrarily complex circuits. The Touchstone file can be obtained from numerical simulations or network analyzer measurements. The obtained file for a ... Mehr lesen
Magnetic Frill
Feeding antennas with proper signals can be difficult. The signal is often described as a voltage, and voltages are not well defined in electromagnetic wave formulations. There are several tricks to model voltage generators in such situations, and one is the magnetic frill. This model ... Mehr lesen