DISTRIBUTED POWER AMPLIFIER Russian patent published in 1997 - IPC

FIELD: wide-band step of power gain of USW radio transmitters. SUBSTANCE: distributed amplifier uses 2n ≥ 4 resistive components 1, n input quadrature 2 and n output 3 quadrature bridges-eight-terminal networks, 2n input 4 and 2n output 5 correcting reactive four-terminal networks having identical frequency characteristics, matched resistor 6 and ballast resistor 7. Bridges 2 and four-terminal networks 4 make up the input transmission line, and bridges 3 and four-terminal networks 5 - the output transmission line, each in the form of band-pass filter sections with taps cut in one after the other. Each section of the input and output lines is formed by one bridge and two four-terminal networks, input 2 and 4 or output 3 and 5, respectively; the inputs of the four-terminal networks are connected to two bridge arms, having an electromagnetic decoupling; the outputs of these four-terminal networks form taps, and the other two bridge arms serve as an input and output of the band-pass filter section. Resistive components are cut in between the respective taps of the input and output lines. Output of input line and input of the output line are loaded into resistors 6 and 7. Increase of output power and efficiency is conditioned by suppression of the back wave in the output line, as well as by increase of the load resistance of the resistive components. EFFECT: enhanced output power and efficiency. 1 dwg