Bandpass Filter Design

[fourierpwn]

Hi all,

I am trying to design a bandpass filter for f0 of 9.25 GHz, BW of 500 MHz. I have a somewhat suitable design which was done using a filter design wizard, however there appears to be passbands at all of the multiples of the one intended. So, passband at 9.25 GHz, 18.5 GHz, ~ 27GHZ, ~36 GHz, ~45 GHz etc.

If this is undesired, what are some measures I can do to eradicate these extra passband multiples?

I hope that is clear enough! 

[Kalvin]

You will get nice hits when you google with the following terms: microwave bandpass filter harmonics

[KJDS]

It's quite normal to have to add a low pass to a bandpass if you need to reject harmonics.