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900MHz RFID antenna using ADS

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tiger_ads

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dipole rfid 900mhz

hi guys
i have confused by setuping port type in ADS momentum. by help document, i can define the port as differential type , and associate each other. but i can't do it with my dipole antenna, illustrating as following:
i can simulate it with internal port type, but i can't decide which type should i use?
another question, this RFID is encapsuled with PVC, and the antenna is printed on PET(a very thin "paper"), i set the substrate as follow:
////freespace////
////PVC/////
///stip cond///
///PET////
///PVC///
///freespace///
am i right?

thanks
 

ads rfid antenna

please upload your project file.
 
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    STANIS

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ads rfid

tiger_ads said:
hi guys
i have confused by setuping port type in @DS momentum. by help document, i can define the port as differential type , and associate each other. but i can't do it with my dipole antenna, illustrating as following:
i can simulate it with internal port type, but i can't decide which type should i use?
another question, this RFID is encapsuled with PVC, and the antenna is printed on PET(a very thin "paper"), i set the substrate as follow:
////freespace////
////PVC/////
///stip cond///
///PET////
///PVC///
///freespace///
am i right?

yes your right, but port setting as follow;
in dipole antenna design port_1 "Port Type" ought to internal, port_2 "Port Type" setting to "Ground Refernce"...."Associate with port number" Assign to "1" (<= port_1)..

you can run it...


thanks
Click to expand...
 

900mhz rfid

It is very difficult to comment based on fig. you have attached.
attach your ADS project files.so that we will try in helping you.
 

thanks for your help!!
the two project is different, but for one type RFID, i just want to know their input impedance. the layout 2 can be defined as differential port type, but the layout1 can't , there is always an error!
and i want to know, which port type should i define so that i can get the actual input impedance? differential or internal plus ground refference? the result is different from each other!
 

Yes, i have set the port 1 as an internal and port 2 as a Ground Reference, and it works. But remember the you have to set the port's impedance to be complex due the RFID chips are different than 50ohms
 

To Buenrostro:

I have tested your suggestion,but the result is error
your port`s define is right,but two port cannot define as photo,i do not know how to define the ports,can you tell me?
 

kspalla said:
You need to consider the interface between antenna to the circuit, which is missing here.
Click to expand...

Do i consider the interface between antenna to the circuit?

Why???
 

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