Abstract
A new balanced power amplifier utilizing the reflected input is described. In general, the single-ended amplifier section in balanced amplifiers is not matched perfectly, so the reflected input power is terminated conventionally at the isolation port of branch line hybrid coupler. However in this work, the reflected power is injected into the auxiliary amplifier, and its output power is combined to the output power of balanced amplifier. Therefore final output power, power gain, and efficiency performances of the proposed balanced amplifier are highly improved compared to the conventional balanced amplifier. For the verification of the proposed balanced amplifier, a conventional balanced amplifier and the proposed balanced amplifier are fabricated and measured, and the measured results are compared. The proposed balanced amplifier shows an improvement in terms of output power(Pout), power gain, and power added efficiency (PAE) by 2.9 dB, 2.3 dB, and 7 %, respectively.
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