We use radial stubs for the the biasing of diode as well. How we can locate the best position to include radial stub in the circuit design.
I guess you are working on Microwave diode. The position of stub will depend upon dynamic impedance of diode, you are using, Once load impedance is known, you can use standard position of stub and stub length (Refer Microwave book Liou of any standard book stub matching using smith chart).
Agreed with Dr Amipara. In addition, my view is to check its frequency response in isolated mode before going for integrating them. Basically passive component and active device need to be checked in isolated mode and then integrated. All three responses then to be compared. Please use CST. Best wsihes
Is it for biasing or matching? If matching then what Dr Amipara and Dr Vedvyas explain to you. If for biasing, there must be microstripline to represent inductance about quaterwave length and then place radial stub as capacitance acting like LC circuit.
Sir I am using it for biasing the diode to avoid shot via hole and to remain the size as compact as possible.
Before radial stub i am using a high impedance line say 100 ohm, and then after radial stub with angle of 70 degree and lambda/4 length but output is going worst and tryying to sort out what can be a problem
what is the length of 100 ohm line? have you placed capacitor to isolate between RF signal and DC .
No sir, that is why radial stub i have used that will do the work for it,
In my circuit where I have the diode with it, i have used a high impedance line of 100 ohm , lambda/4 length with substrate value of 3.55 its around 16mm. I think capacitor is not required that is the reason radial stub is used
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