download rfid tag & reader simulator
I was wondering if it is possible to simulate a simple inductive coupling setupinvolving a small tag antenna (5cm by 5cm) with a reader loop antenna (10cm by 10cm) at 13.56MHz using HFSS. Is this frequency feasible in HFSS, I am guessing it is too low (wavelength = 22metres)?
Thanks for your time
:)
I would have thought that since HFSS is a frequency domain solver it would have been the best choice for this.
When I have tried to simulate RFID antennas at 13.56MHz with time domain codes (CST + Microstripes) I have had problems due to the low frequency.
I am not an expert in HFSS so maybe someone else can provide more info, but I think it will be OK.
A volume mesher is appropriate for RFID if you want to simulate tag and reader coils that are not parallel, or an object near the tag and reader coils. If the tag and reader coils are planar and parallel, you should not use a volume mesher of any kind, that is extremely inefficient compared to using any planar EM tool. There are a number of planar EM tools that give very quick and reasonably accurate answers (in fact, I would think the answers from any of the planar tools will be more accurate than any volume mesher, even if the volume mesher takes 10 times longer). I work for one of the planar vendors, Sonnet. In the following thread:
http://www.edaboard.com/viewtopic.ph...highlight=rfid
you will find a description of how to analyze an RFID tag/reader with the free EM tool, SonnetLite (www.sonnetsoftware.com). The sonnet files are also there for you to download. If you don't have enough points to download them, I will be happy to email them to you.
You will get fast accurate answers, and it is free.
most of those sonnet files won't work with my version of sonnet lite (newest release) , most of them say they can't be opened or analysed due to license limitations. I haven't got the money to buy better versions :(
Looks like I'm going to have to look at other options
look at this articles
http://www.cst.de/Content/Articles/article137.aspx
http://www.cst.de/Content/Articles/article138.aspx
pl
Hi Catalyst -- Sonnet Lite is OK for the examples which analyze a single RFID coil. For two coils, you need the full Sonnet. If you are doing university research, you can get the full Sonnet Professinal really inexpesively. If that is still not cheap enough, maybe there is some public domain program you can use, perhaps someone will make a suggestion.
Sonnet costs quite a bit less than HFSS, if you are a university user, you can get a just as good a deal from Sonnet and probably any other EM vendor as you have from Ansoft (and likely you can get even better). I think you are proably not a commerical user because HFSS is much more expensive than any of the planar tools presently available.
plasma .....
thanks for your info.. your things are much helping me....