Design a custom Interdigital Bandpass Filter

Fill out the form below to design a bandpass filter as described in the January 1985 issue of Ham Radio Magazine. These filters are generally limited to frequencies above 200 MHZ because their size is slightly longer than 1/4 wavelength. Click here for a drawing of a generic filter. You may also download the C++ source for this program

Number of elements
Ripple in DB
Center Frequency in MHZ
Bandwidth in MHZ
I/O Impedance in OHMS
Ground plane space in INCHES
Rod diameter in INCHES
End plate to rod in INCHES
Points to graph (max = 40)
Frequency step size in MHZ