900MHz RFID antenna using ADS

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tiger_ads

Joined: 17 Jun 2005
Posts: 56

13 Dec 2005 11:20 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

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flyflyhigh

Joined: 23 Oct 2004
Posts: 35
Helped: 6

13 Dec 2005 13:47 ads rfid antenna

please upload your project file.

foxman

Joined: 28 Mar 2002
Posts: 23

14 Dec 2005 1:15 ads rfid

tiger_ads wrote:

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

ADS_RFMW

Joined: 18 Aug 2005
Posts: 136
Helped: 4

14 Dec 2005 5:45 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.

tiger_ads

Joined: 17 Jun 2005
Posts: 56

14 Dec 2005 15:02 Re: 900MHz RFID antenna using ADS

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!

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14 Dec 2005 15:02 Ads

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Buenrostro

Joined: 14 Dec 2007
Posts: 5

18 Dec 2007 19:51 900MHz RFID antenna using ADS

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

wforest6810

Joined: 05 Nov 2009
Posts: 6
Location: Beijing,China

05 Nov 2009 19:42 Re: 900MHz RFID antenna using ADS

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?