Hi,
I want to add LP filter on USB cable.
I used the values of R=200ohm, C=1pF (ceramic) which should pass signals from DC to 800MHZ.
I cut the USB extender and soldered the LP filter on the Vcc, D+ and D- wires.
Sketch and photos attached.
The problem is when I connect a USB device at the end my PC doesn't recognize it.
I checked voltages and shorts using multi meter and everything looks fine.
Can someone tell me what I am doing wrong?
Thanks

 

200 ohms resistance is preventing it from working.

Ask yourself what the voltage drop would be at the rated output current of a USB port.
What and why are you trying to filter?

 

I checked the voltage drop and it gets 5.02V after filtering.
I am trying to cancel RF signals that USB wires are capturing (as they act as an antennas)

 

I think ferrite beads and other inductor based solutions are the usual go-to in situations like this.

In fact, lots of USB cables have chokes molded right into the cable. Maybe one of these would solve your problems.