Abstract
In this paper, a microstrip filtering Class-F power amplifier (PA) is proposed by using an output impedance transformer (IT) with a dual-mode bandpass response. The lengths of the drain bias stub and coupled feed line are elaborately selected to meet the requirements of a Class-F operation. The fabricated circuit is centered at 3.5 GHz for 5G applications. The maximum gain at saturation is 11.4 dB with Pout>38.5 dBm. The maximum power added efficiency (PAE) is around 63% while the effective bandwidth under PAEs > 50% is 250 MHz.
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