how to reduce insertion loss of a cavity filter?

[y99lx]

insertion losses in cavity filter

Dear cavity filter experts,

Please discuss possible solutions for the reduction of insersion loss of a cavity filter. There is no dielectrics in the cavity.

Thanks,
tommy

 

[biff44]

cavity filter loss

Choose the right resonator mode for highest Q (see any emag textbook), and silver plate the whole thing.

 

[y99lx]

insertion loss filter]

you are right, but the two things you mentioned are commonly used ways. Are there any other tricks?

thanks.

 

[kspalla]

Reduce the order of filter

 

[Phytech]

Increase ground plane spacing.

 

[happyday]

Increase dimension of the cavitys, the bigger cavity must be reduce insertion loss.

 

[biff44]

Some cutting edge research using this new metal:

https://james-camerons-avatar.wikia.com/wiki/Unobtanium

Making the filter out of this will give passband gain!