So the center frequency will be :
Center Frequency 703 - 803 MHz = 753 MHz
I use Bandstop filter calculator refer to http://www.wa4dsy.net/filter/filterdesign.html
After we input the parameter of center frequency 753 MHz , and bandwith 100 MHz at calculator, then click compute parts as the menu on calculator, then we get the result of 3 filter design with 2 circuit , butterworth, bessel, and chebyshev.
You can choose one of three offering design and choose one of two circuit for your implementation.
The output chart graph of filter design are :
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