phase combining of high power amplifier
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Phase Combining of high power Amplifier
Shiv DuttVedang Radio Technology
Block diagram
IPP-2043 Datasheet
Pin Configuration
Phase shifter selection
The major parameters of Phase Shifters are:– frequency range– bandwidth (BW), – total phase variance (Δф), – insertion loss (IL), – power handling (P), – accuracy and resolution, – input/output matching (VSWR) or return loss (RL),
HMC934LP5E
• The HMC934LP5E is an Analog Phase Shifter• Analog control voltage from 0 to +13V. • Variable phase shift of 0 to 400 degrees• Octave Bandwidth: 1 to 2 GHz• A typical low phase error of +3.5V / -2 degrees.
Split phenomena
• In term of voltage (a vector quantity)
• In term of Power (a scalar quantity)
Mathematical analysis for Split and combine phenomena
In term of voltage
In term of Power power can not be add like that so It is hypothetical to understand
Wave flow for Split and combine phenomena 1
Wave flow for Split and combine phenomena 2
Procedure
• Set maximum amplitude of power using variable attenuation first and secondly, use phase shifter movement.
• Repeat the same process at 10W, 50W, 100W, 200W and 400W.
• Output cables of Amplifiers must be equal to avoid any mismatch or loose the power.
• Both 50E termination must be grounded with screw.• Split the total band width into two sub band
Practical Approach on Phase shifter board
Freq(MHz) P. fixed(dB) P. variable (dB) Voltage (V)
band 11350 -13.44 -10.71 Vamp=4.923V
Vphase=4.013V
1400 -13.38 -10.81460 -13.34 -10.9
band 21461 -13.34 -10.9 Vamp=4.923V
Vphase=4.013V
1500 -13.32 -10.961550 -13.34 -11
0dBm input signal
Intentionally hide
Working of Phase shifter without Amplifiers
Freq(MHz) S21 Voltage (V)
band 11350 -12.22 Vamp=4.923V
Vphase=4.013V
1400 -11.031460 -10.3
band 21461 -10.29 Vamp=4.923V
Vphase=4.013V
1500 -9.981550 -9.65
Freq(MHz) S21 Voltage (V)
band 11350 -9.74 Vamp=4.913V
Vphase=2.597V
1400 -9.551460 -9.75
band 21461 -9.8 Vamp=4.913V
Vphase=3.332V
1500 -9.731550 -9.81
0dBm input signal
Thank you
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