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Explain your situation. What modulation from where you are getting the input, where you are measuring etc.
What Vfone told is, the signal you are seeing is not modulated.
Hi,
yes that is correct even in simulation simulating with a 50 ohm port wont give you the correct measure of S11.
If you have a tag tester , like Ni's PXIe-1062Q Put your tag on it and sweep the frequency. It will back scatter more at the resonat frequency.
I have tried measuring using a...
Re: EPC gen2 can single tag can be accessed by multiple read
Thanks Aya2002,
I have been working on UHF RFID , readers and tag design
.As I said before being an RF engineer I am not much familiar with access protocol and how it works.
I need to go only by standard, as I am trying to solve an...
Hi Aya2002,
No Tags are passive.
I would like to hear more from you how a single tag can be accessed by a multiple interrogator.
Hi FvM,
My apologies. I made the post in a hurry
Yes you are right , I am referring to EPC Global gen2 standard.
I too think the same, But EPC standard...
Re: RFID TAG reading
Hi,
RN16 is the handle that the tag gives as an unique identifier for a interrogators REQ_RN command. This is the first step in inteerrogator to tag communication I guess.
I am basically an RF engineer, this area is new. We had a problem while going for certification...
two req_rn
Hi,
Can two interrogators access a single tag at the same time.??
According to Epc tag will have ability to store 2 RN16s. So if a tag receives Req_RN from two interrogators will it be able to send different RN16's.
By using different sessions and inventoried flags tag can...
Could you be more specific on what you are looking for.
As you said,
1. You should know the spec ,for what application what frequency what gain etc
2. Design the same on paper
3. Verify and optimise your design using a simulation tool, like CST IE3D etc
4. Make the proto
5. Testing, test and...
Take a notepad save it as name.s2p (Not as name.s2p.doc)
You can type comments with an !
If you have S parameters of a device enter them as given below
Format of file is expressed as
# GHZ S MA R 50
means Frequency in GHz then S parameters in the order Magnitude Angle and R 50 means 50 ohm...
Yaa I too have noticed the same . I have used aluminium lossy metal 3.72e+007. for my antenna. there is no change in S11, also a very minimal change in surface current and Magnetic energy density when compared with PEC.Far field is also same.
Re: design rule explaination
me too curious to find what you are talking about !!!
Is it redarding CAD tool, layout ?? DRC ????
Design verification ??
simulation ???
Re: About RF conditioning
As Kspalla wrote , if you are a designer you can correct for the unwanted frequencies at different stages. But if you are converting an existing system to some other band you have only duplexer and additional filters to play with.
how much rejection you need ... say...
Re: About RF conditioning
I think, you cannot change the duplex spacing as the standard specifies duplex spacing for each band. may be you will be needing additional filters . For that you need to check for spurious and out of band components and check with standard specification. Find out how...
S21 means we need a ideal antenna connected to one port and test antenna to other port, Right.
Will this hold true if the antenna is non isotropi. If antenna has some directivity.
I did some googling and found that 2 common methods used are wheeler cap method and Q factor method but the setup...
antenna q factor losses efficiency
Hi
How to measure Efficiency of an antenna.
Can we use Network analyser or spectrum analyzer and do the same. Do we need chamber for this measurement.
Please let me know if anyone has got anyapplication note on this.
Thanks
GVVIN
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