Assume you want to design a 3 GHz low pass filter and you wa…

Assume you want to design a 3 GHz low pass filter and you want the rejection at 6  GHz (so twice the normalized cut-off frequency) to be at least 20 dB. (i.e. S21 < -20 dB) Which of the following filter prototype choices  might do the job (select all that apply)