Terminator3
Advanced Member level 3
While designing negative resistance oscillator I found a solution, when active device is oscillating when matched to 50 Ohm load (on input and output) in range around 9-11GHz. When microstrip ring resonator is coupled to input microstrip line at certain phase angle (to match 1/S11 angle), then oscillator "locks" to resonator center frequency of 10GHz. My question is it normal that negative resistance oscillator works without resonator, or can it be a problem somehow? I tried many different solutions, where main problem was wrong frequency of oscillation (4GHz ,6,12,16 GHz, etc.). Compared to those new solution looks very promising, but as it oscillates even without resonator, i have some doubts.