In this letter, we propose a methodology for designing high efficiency broadband harmonic-controlled power amplifiers(PAs)with a novel harmonic matching network. This network consists of three secondharmonic open circuit microwave lines and three third-harmonic short circuit microwave lines, each corresponding to different wavelengths for different frequencies. It can improve the efficiency and bandwidth of PAs by controlling harmonic match impedance. Through the proposed network, we design and fabricate a highly efficient broadband continuous Class-F PA using a CGH40010F GaN HEMT device. The measurement results show that the drain efficiency of 71.4% to 82.4% (the average efficiency of 76.9%) and output power of 40.4dBm to 42.6dBm are achieved at 1.3GHz-2.5GHz, respectively.
This paper presents a multi-octave class-EFJ power amplifier based on a compact coupling structure. The compact coupling structure derives the output matching network impedance which is a simplified Ttype network. The compact coupling structure reduces the output matching impedance range to meet the impedance requirement of the class-EFJ power amplifier. This coupling structure can meet the design space of the optimal fundamental impedance and control the harmonic matching impedance. Compared with the traditional design method, this design method can meet the requirement of the miniaturization and improve the efficiency in a wide bandwidth. In order to improve the efficiency and broaden the bandwidth, the input matching network is used a stepped impedance and open circuit microwave line matching method. To verify the proposed structure effectiveness, a multi-octave bandwidth and high efficiency PA is designed and fabricated with a GaN HEMT CGH40010F. The measured results show that the output power of 40.2dBm to 42.9dBm and the drain efficiency of 62.8%-72.4% are achieved at 0.9GHz-3.4GHz, respectively.
In this letter, we propose a novel methodology for designing high-efficiency broadband harmonic-controlled power amplifiers (PAs) using a new wideband bandstop network. This network consists of many parallel open circuit microstrip lines, each corresponding to a quarter of wavelength for different frequencies.
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