Messing with Substrates (10 GHz bandpass filter) [silly]

In this post we will take a reasonable 10 GHz bandpass filter (at least for a new grad student) and see how a new substrate will change how this filter works.

This is the original bandpass filter with the standard substrate:

messybp2

messybp1

If you can read the numbers on the above pic, you could also build this filter. Let’s get a better picture of what the substrate is for the original circuit:

messybp3

 


Let’s try a silicon dielectric, shall we?

messybpsilicon

One thing is for sure – it’s not a bandpass filter anymore.messybpsilicon2

 


Let’s add a 20 mil Indium conductive layer below the dielectric:

messybpindium

Voilà! It’s centered at 8 GHz! Brilliant!

messybpindium2

 


Here’s a thought – how well does your bandpass filter work underwater?

messybpwater1

It looks like your bandpass filter might give you a little gain there at some frequencies in water!messybpwater2

 

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