Full Member level 4
Does it make any sense to use tunable bandstop filter as a mixer? For example, RFID antenna connected to 50 Ohm resistive termination with tunable bandstop in-between. By varying bandstop center frequency we can absorb or reflect interrogating signal. For example, bandstop using coupled microstrip ring resonator or similar structure, with a varactor to tune central frequency. My idea is that for some devices this configuration may provide larger impedance variation over smaller tuning voltage. As some energy is stored in this resonator, how it would affect mixing behavior?