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Tuning bandpas filter with thin film dielectric glued on top, what is that material?

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Terminator3

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Long time ago i saw amateur website, where band pass filter tuned a little down in frequency by adding thin film of yellow color above the filter. I tried using pcb dielectric and plastic film from advertisement, but it is difficult to glue. So any suggestions on that material?
 

Terminator3 said:
Long time ago i saw amateur website, where band pass filter tuned a little down in frequency by adding thin film of yellow color above the filter. I tried using pcb dielectric and plastic film from advertisement, but it is difficult to glue. So any suggestions on that material?
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The thin yellow film was most likely Kapton take.
 
Thank you! It is what i am looking for!
 

yeah but kapton tape is not very high dielectric constant. A small piece of ceramic, rtv-ed in the corners, may work better.

also, depending on the filter type, u might get by with adding solder, or even short lengths of wire, to the resonator ends. A solder blob, with its fringing capacitance to ground, will tune a resonator lower in frequency.
 

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