A LOW DISTORTION TECHNIQUE FOR REDUCING TRANSMITTER INTERMODULATION

This paper proposes a low distortion technique which reduces transmitt er intermodulation. It is shown that one of the third order transmitte r intermodulation products generated can be reduced by using a paralle l amplifier configuration which includes a 45 degrees divider and a 45 degrees combiner. It is already known that the other third order tran smitter intermodulation product can be reduced by using a parallel amp lifier configuration using 90 degrees hybrids. Thus, all of the third order transmitter intermodulation can he reduced by combining these co nfigurations. This paper also shows the experimental results obtained with a parallel amplifier using 90 degrees hybrids and one using a 45 degrees divider and combiner in the K-band, The spectra of these ampli fiers are compared, and it is found that third order transmitter inter modulation can be reduced by more than 29 dB in the parallel amplifier using the 45 degrees divider and combiner.