High-Q Bandpass Filter for 10 GHz

[Georgy Onishchukov]

Hi,

we are looking for a bandpass filter with Q-Factor about 10000 for the
central frequency near 10 GHz.

Unfortunately the best offer we got till now is Q-factor about 3000.

Any idea where can we ask for the device?

Georgy

 

[John Larkin]

Hi,

we are looking for a bandpass filter with Q-Factor about 10000 for the
central frequency near 10 GHz.

Unfortunately the best offer we got till now is Q-factor about 3000.

Any idea where can we ask for the device?

Georgy

Pozar has an example of a circular copper air-filled cavity resonator
at 5 GHz, having a Q of 42,000. Dielectric resonators run more in the
3000 range you cite.

John

 

[Winfield Hill]

Georgy Onishchukov wrote...

we are looking for a bandpass filter with Q-Factor about
10000 for the central frequency near 10 GHz.

Unfortunately the best offer we got till now is Q-factor
about 3000.

Learn how to make good cavities.

 

[Rene Tschaggelar]

Hi,

we are looking for a bandpass filter with Q-Factor about 10000 for the
central frequency near 10 GHz.

Unfortunately the best offer we got till now is Q-factor about 3000.

Any idea where can we ask for the device?

For a waveguide or for coax ?
What about the thermal drift ?

Rene

 

[Mark]

the tuning rods for resonant cavities are made of invar to minimize
thermal drift.

Mark

 

[Steve Kavanagh]

Do you mean unloaded Q or loaded Q ? An unloaded Q of 10,000 is
probably not unreasonable for silver plated waveguide cavities, but in
practice a filter bandwidth of less than 10 MHz (loaded Q of 1000) is
not normally seen at 10 GHz.

Steve

 

[Rene Tschaggelar]

the tuning rods for resonant cavities are made of invar to minimize
thermal drift.

I was rather concerned about the walls. Depending
on the power disposed in this resonator it may
also heat up up a bit by itself.
And the resonator may also be thermally cycled,
as part of its purpose.

Rene