Designing Bandreject filters

[Corneo]

Is there a way I can design a broadband reject filter using a lowpass filter with cutoff frequency $f_1$ and a highpass filter with a cutoff frequency $f_2,\ (f_1 \ll f_2)$ , combined in parallel with a summing amplifier? My current design yields a response that isn't a broadband, there is a significant bump at the center frequency. If I cannot do so, will I have to use a ramp up and a ramp down?
Sorry for having a run on sentence.

 

[willisfang]

try higher order equial ripple band stop filter design pattern.