What Is Cst Microwave Studio

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Hieverybody,

I'm new to CST microwave studio. Just finish constructed a structure ofan L-probe patch antenna (from IEEE paper) and just run the simulationby transient time solver, the curve of the return loss(S11) againstfrequency that i get is different from what showing on the IEEE paper,so is it the boundary condition setting will affect the simulationresults? And actually what is the function of setting the boundarycondition?

During the simulation, a warning message "some PEC material is touchingthe boundary" was show. After change the boundary condition setting to"open(add space)" then the warning will eliminate when run again thesimulation. But the s11 curve still different from the "actual" results.

Anybody can help?

Any comments will be appreciate.

Thanks.

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I'm designing an antenna structure that will be embedded with a 4-layer radio circuit. The difficulty I'm facing to simulate the structure is not getting the prepreg 7628 material (fiberglass impregnated with resin) in the CST microwave studio library. It will be very much helpful If anyone gives me any solution. thanksFor reference one 4 layer stack is also added. source:

The problem with your simulation is quite a good model for real life - prepreg is a very variable material, and so there's probably little point in trying to model it exactly. It's not intended for RF work, which is why it's not in the library.

Design your antenna with a range of FR4s that are in your library in the thickness and resin ratio range that's expected for the prepreg, and see whether you get adequate performance for them all. If you can't find the data for the prepreg, that's another indicator that it's not going to be well specified or repeatable. Although the board fab talks about controlled impedance, it's probably for high speed digital lines, which are far more tolerant than RF.

If you're using layers 1-3 or 1-4 for the antenna, then you have much less of a problem, as the dielectric is dominated by the core, and variation in prepreg performance is going to give you a smaller variation in the overall dielectric. You'll see that improvement in both simulation and real life.

Of course, even FR4 core is not that good at RF. If you want better performance / repeatability / agreement with simulation, then you'll use something like RO4350. This has similar Er, and can be processed like FR4, but with much tighter RF specs and better loss.

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N2 - In this paper the suitability of using a printed circuit board (PCB) microstrip patch receiving antenna for a novel application - RF energy harvesting to power a wireless soil sensor network deployed in an outdoor environment - is investigated. The performance of a conventional circular microstrip patch antenna using different microwave laminate substrates is evaluated in terms of return loss, radiation efficiency, and gain. Based on a chosen PCB material as the antenna substrate, an enhanced gain circular patch with a ring shaped parasitic radiator is presented. Simulations have been carried out using CST Microwave Studio to examine the antenna's performance both in free air and in the presence of different soil conditions. 2009 IEEE.

AB - In this paper the suitability of using a printed circuit board (PCB) microstrip patch receiving antenna for a novel application - RF energy harvesting to power a wireless soil sensor network deployed in an outdoor environment - is investigated. The performance of a conventional circular microstrip patch antenna using different microwave laminate substrates is evaluated in terms of return loss, radiation efficiency, and gain. Based on a chosen PCB material as the antenna substrate, an enhanced gain circular patch with a ring shaped parasitic radiator is presented. Simulations have been carried out using CST Microwave Studio to examine the antenna's performance both in free air and in the presence of different soil conditions. 2009 IEEE.

KW - Antenna substrates, Circular microstrip patch, Circular Patch, CST microwave studio, Microstrip patch, Microwave laminate substrates, Novel applications, Outdoor environment, Parasitic radiator, Radiation efficiency, Return loss, Soil conditions, Soil sen

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