What are wideband notch filters made of ?

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kyjackchan

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Wideband notch filters

Some commercially wideband notch filter ($few grands) has passband frequencies from DC up to 18ghz, anyone know what they are made of? and what is the theory behind it?

THx
 

Re: Wideband notch filters

For wide band notches you can use a low pass and high pass filter in parallel signa paths that get added togther.

Another neat trick is to use I and Q down conversion to DC and then pass both sides through high pass filters and then up convert with same I and Q local oscillators.
 

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