yefj
Advanced Member level 4
Hello , I have built a unit cell wich intend to do beam steering using phased array theory.
So basicly i think of a unit cell as a "patch antenna".
my "patch" has two resonances i could tune.
Each resonance has its own phase as shown below.
the first resonance is at 0 degrees .the second resonance is 145 degrees.
Why at different resonance i get different phase?
What is the logic of the phase value at the resonances?
Which resonance i should use for phased array?
Thanks.
"For the impedance transfer function, the series resonance always occurs 1st from L1C1 with resonance at 0 deg. The 2nd resonance is parallel with C1 in series with C2 making it slightly smaller at the slightly higher f with 180 deg phase shift, thus requiring an inverter for an oscillator.
Gain margin for stability depends on the attenuation at resonance which is limited by Rs in series and the external Rs for parallel that must be less than the gain (f) of the amplifier."
So basicly i think of a unit cell as a "patch antenna".
my "patch" has two resonances i could tune.
Each resonance has its own phase as shown below.
the first resonance is at 0 degrees .the second resonance is 145 degrees.
Why at different resonance i get different phase?
What is the logic of the phase value at the resonances?
Which resonance i should use for phased array?
Thanks.
"For the impedance transfer function, the series resonance always occurs 1st from L1C1 with resonance at 0 deg. The 2nd resonance is parallel with C1 in series with C2 making it slightly smaller at the slightly higher f with 180 deg phase shift, thus requiring an inverter for an oscillator.
Gain margin for stability depends on the attenuation at resonance which is limited by Rs in series and the external Rs for parallel that must be less than the gain (f) of the amplifier."