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Antennas, Transmitters & Waveguides

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Modeling Metamaterials Leads to Major BreakthroughModeling Metamaterials Leads to Major Breakthrough

Duke University, Durham, NC
In their efforts to use metamaterials to construct the world´s first working prototype of an invisibility cloak, researchers relied on modeling to lead them...

The Last Frontier in the Electromagnetics SpectrumThe Last Frontier in the Electromagnetics Spectrum

Rice University, Houston, TX
The least-explored region of the electromagnetic spectrum consists of terahertz waves, which at 100 GHz to 10 THz fall between microwaves and infrared light....

Simulations Key to Non-Lethal Microwave WeaponSimulations Key to Non-Lethal Microwave Weapon

SARA, Inc., Cyprus, CA
SARA, Inc. is using COMSOL Multiphysics project to develop an antenna that supports directed transmissions of high-power microwaves (hpms). Such is used in a...

Example Models

Coaxial to Waveguide CouplingCoaxial to Waveguide Coupling

Feeding a waveguide from a coaxial cable is a straightforward way to achieve electromagnetic waves inside a waveguide. Due to its small size and circular shape, the cable contributes significantly to the overall size of the problem. It is...

Thermal Drift in a Microwave Filter CavityThermal Drift in a Microwave Filter Cavity

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...

Balanced Patch Antenna for 6 GHzBalanced Patch Antenna for 6 GHz

Patch antennas are compact and easy to fabricate. The layout of the patch and the properties of the printed circuit board determine the radiation pattern. This model is a full 3D simulation of a patch antenna. It finds the optimum...

Capacitance in a MicrostripCapacitance in a Microstrip

To illustrate how to calculate the lumped parameters this model calculates the capacitance in a microstrip. The example shows the two different ways of calculating the capacitance. The model is solved twice: once with a static analysis...

Three-Port Ferrite CirculatorThree-Port Ferrite Circulator

A microwave circulator is a multiport device in which a wave incident on Port 1 is coupled only into Port 2; a wave incident on Port 2 is coupled only into Port 3; and so on. Circulators are used to isolate microwave components, for...

Model of an RFID SystemModel of an RFID System

RFIDs are used in a multitude of applications such as tracking or identifying consumer products and their packaging. An RFID system consists of two main parts: A tag or transponder with a printed circuit-board (PCB) antenna A reader...