Design of high-efficiency, multi-octave hybrid continuous mode power amplifier with novel low-pass filtering matching network

This paper presents a design method for a multi-octave, high-efficiency power amplifier (PA) with a novel low-pass filtering matching network. Both extended continuous Class-F and continuous Class-F−1 are engaged to expand the design space for the ultra-broad operating band. A wideband vertex coupled radial stubs (VCRS) low-pass filter alongside a transmission line network (TLN) is proposed as an output impedance matching network of the PA. The wide rejection band and sharp transition band of this filter make it suitable for harmonic tuning PAs. To verify the feasibility of the proposed structure, the PA is fabricated and its performance is measured. The fractional bandwidth of 155% across 150 to 1200 MHz with a drain efficiency of 61%–73% and output power of 38.9–39.5 dBm is achieved.