design inductors with ADS

It depends on your technology and frequency. Should it be on a pcb or on chip?

I want to design an inductor On a Pcb (printed inductor)

ok, and frequency range?

Let's say 125 Khz like the one used foe receivers in wireless power transfer
http://www.tdk.co.jp/wireless_e/pdf/...-15f5-g_en.pdf

forget about printed inductors at this frequency because you need a lot of area. what is the purpose of the inductor? some power transfer or filtering?

Some power transfer

it's much easier to buy a coil instead of designing one, especially at such low frequency. If you really want a printed ind. you're faced with different problems, e.g. between traces you have to use a minimum spacing or the thin trace thickness. IMHO, it's not a good idea.

For Coil that I found in internet , they have a mean dimension 3cm x 4 cm for my application I need a coil with a max dimension of 4 cm x 2 cm
Maybe you know some references of smaller coils?

Maybe this one: http://www.farnell.com/datasheets/1782026.pdf . it's around 3x3, but a printed ind would be for sure larger with same inductance value.

the inductance value can be changed , the design chracteristics are :

Nevertheless, take a commercial one, because you can't choose your inductance too small for an adequate power transfer. OR make your own one from copper wires, also possible.

Inductor mechanical dimensions are theoretically ( and surely up to moderate RF frequencies ) almost independent from the frequency.
For instance 1uH@100kHz has always same dimension @1MHz
or 1nH@100MHz has dimensions as same as @1GHz..
For an information only...

Agree, but comparing his idea of a pcb inductance with a commercial one, the pcb ind. will be larger for the same value.

10x for your answers ; I think that I'll test the both: commercial coil and the same time I want to learn how to simulate coils with ADS for future applications
so, I tried to simulate a commercial coil with ADS after simulation , we can insert a template that calculate directely L, R and Q:
with my design I get the same value of L =1.18 uH but not for the resistance that is very low which give a very high Q

please have you any idea? any explinations? why I don't get the right value of R?

http://www.abracon.com/NFC-antenna/ANFCA-2515-A02.pdf

How you simulated your design? Maybe you can also post your pcb stackup for em-simulation.

Is your cond material PEC?

I used copper

Mhmm, can you upload your simulation, that I can check?

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