I have inductor to block RF. My signal is between 1 and 2 GhZ.
How should I choose the value of this inductor ? 1µH is enough ??
What are the other parameters to take care about ?
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Your proposed 1 micro H coil has more than enough inductive reactance at 1 GHz to not affect the 50 ohm match.
Problem is when it comes to real coils that have parasitic capacitance. This parasitic capacitance along with your labled inductance gives rise to a parallel resonant frequency. If this resonance is below in your case 2 GHz then the coil is really a capacitor at the top end of your frequency range.
These days coil manufacturers are more likely to state resonant frequencies. When you select your production coil you will be in nH and not micro H because the larger inductances have much lower resonant frequencies.