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Antennas, Transmitters & Waveguides

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	Modeling 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 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 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 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 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 that...
	Balanced Patch Antenna for 6 GHz Patch antennas are becoming more common in wireless equipment, like wireless LAN access points, cellular phones, and GPS handheld devices. The antennas are small in size and can be manufactured with simple and cost-effective techniques....
	Capacitance in a Microstrip To illustrate how to calculate lumped parameters of capacitance, this model calculates such in a microstrip. The example shows the two different ways of calculating this: with a static analysis and with a time-harmonic analysis.
	Three-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...
	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...