Hello Anil,
If you operate pin diode above its specified frequency range then you need to practically Realize it's RLC property and implement same in your simulation model. other wise there are significant deviation in OFF state impedance when frequency increases. please consult attached PDF.
Yes, as long as you crefully account for the diode's series inductance in the on state as well as its parallel capacitance in the off state. you can use it at higher frequencies.
I have successfully used a pin diode where its reverse bias capacitance resonated with the series inductance. By adding some capacitance in parallel to the diode, I could create parallel resonance with the diode inductance when the diode was forward biased.
So, the diode behaved like a series "on" switch when reverse biased, and an "off" switch when forward biased.
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