Inductance selection for different frequencies

Hello Friends,

I am working on amplifier design. For an amplifier which will work in band 7250 MHz - 7750 MHz, I am going to implement distributed matching. I will also implement inductor that will be used in DC feed section as microstrip line. I am not sure about the inductance selection for DC feed at these frequencies. Are there any rule of thumbs about selection of inductances or capacitances for different frequency operations.

Thanks,

For this narrow bandwidth, you can use a narrow line with length 90° = 1/4 wavelength, followed by a 90° = 1/4 wavelength radial stub.

Thanks for the suggestion. As far as I know, narrow line will act as inductor and width of the narrow line will effect its inductance. I am not sure about the inductance value in other words which value I must choose as the width of the narrow line. By the wat I am using 30 mil substrate with Epsilon R of 2.94.

For a wider bandwidth there are commercially available conical coils which have good properties for up to 40 GHz, and inductance high enough to operate as DC chokes from ~2-3 GHz.

For the line-type bias feed, you should think of the line as quarter wavelength segment and not as "inductor". The width is not (very) critical.

I used to set the narrow trace width as 0.2mm, this is the most PCB maker can do, and is robust.