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This paper describes development of a High efficiency HF power amplifier. We fabricated a new wideband power amplifier operating at short wave band (3 MHz-26 MHz) using class-E amplifier and obtained a high output power efficiency of 74% at 25.5 MHz that is a target performance by controlling the shunt capacity for wideband operation. In addition, the low loss characteristic of about 0.4 dB and under...
This paper describes a study on high power short-wave AM transmitter with high efficiency. First, we fabricated a new power amplifier operating at short-wave band (3M-30MHz) using RF MOSFETs and a new output circuit for obtaining high efficiency. Next, we proposed a new power combiner with excellent linearity by tuning the transmitter output circuit including stray capacitance and inductance. In addition,...
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