[Keysight ADS] Some equations for RF/microwave rectifier design

been designing RF rectifiers for years. Since I myself use these equations quite often, I write them down here and hope this page would help you to speed up. 

Note that rectifiers are large-signal operation meaning "Harmonic Balance" simulation is mostly used.

Firstly, you have to have "harmonic balance" and secondly, you have to set a node at the output of the rectifier as e.g. vout. 

To obtain input impedance, you have to add a note at the input port as e.g. vin as well as a current meter.

We need to calculate input impedance from the impedance definition.

Anyway, seeing figures below are easier than texts. 

Figure of the input part

Figure of the output part

The MeasEqu I set

Anyway, you can copy these equations below and paste into your schematic using MeasEqu as I did or use EQU function in ADS display.

To calculate efficiency:

Poutdc=mag(vout[::,0])**2/RL

eff=100*Poutdc/dbmtow(mpin)

To calculate large-signal input impedance:

zind=vin[1]/I_in.i[1]

You can convert the impedance to Gamma and then plot in Smith chart as:

Gamma=(zind-50)/(zind+50)

Of course, you can plot in dB:

s11indb=20*log10(abs(Gamma))

Have fun of rectifier design.