Hello,
I have a technical question in my rectifier fabrications:
Actually i am trying to fabricate one rectifier that operates at 900 MHz (GSM band) and the second one operates at 2.45 GHz (WiFi Band). The one at 900 MHz, the measured S_11 is coherent with that of simulated, however the measured S_11 of the rectifier at 2.45 GHz always shifts to the left at 2.38 GHz. I literally tried everything to technically fix this problem. Does anyone have gone through this problem at higher frequency?
PS: The types of diode packaging and the capacitors in the rectifiers are 'murata' and the matching network is designed by distributed components (with stubs and microlines).
Thank you in advance for the help,
Are you taking into account the input power level during the design of the rectifiers? I'm asking that because the diode impedance depends not only on the operating frequency but also on the input power level.
If you have a way to measure or estimate the expected power level at the output of your antenna, you can use Large-Signal S-Parameter Simulation (LSSP in Keysight ADS) to design your impedance-matching network.
Hello,
Which diode are you using? Are you using the generic diode model with SPICE parameters?
If you are using the SMS7630 diode and employing the generic model with SPICE parameters, there might be an offset. To eliminate the offset, you would need to establish a surrounding diode model, for example, with a TRL calibration kit. This will provide the correct diode impedance at different operating points (power, frequency, bias voltage).
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