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