Dual-Band Continuous Class-F−1 Power Amplifier With Second-Harmonic Suppression for Harmonic Radar Systems

• Published in: IEEE access Vol. 12; pp. 62358 - 62364
• Main Authors: Kim, Bitchan, Oh, Juntaek
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 2024; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Continuous inverse class-F; Dual band; Frequencies; Frequency conversion; Harmonic analysis; Harmonic control; harmonic radar system; harmonic suppression; high-efficiency; Impedance; power amplifier; Power amplifiers; Power harmonic filters; Power transmission lines; Radar; Radar equipment; Transmission lines
• ISSN: 2169-3536; 2169-3536
• DOI: 10.1109/ACCESS.2024.3395518

In this study, a highly efficient harmonic suppressed dual-band power amplifier (PA) for harmonic radar systems is proposed. The proposed PA incorporates a harmonic-controlled dual-band matching network (HCDMN) comprising <inline-formula> <tex-math notation="LaTeX">\lambda </tex-math></inline-formula>/4 open stubs at the second-harmonic frequencies and series transmission lines. The HCDMN can effectively suppress unwanted second-harmonic signals and control the fundamental and second harmonic impedances to operate in continuous class-F1 mode at two operating frequencies. The implemented PA has dimensions of 75.3 mm <inline-formula> <tex-math notation="LaTeX">\times 54.9 </tex-math></inline-formula> mm. Measurement results demonstrate that the PA achieves an exceptional performance, with peak drain efficiencies (DEs) of 81.5 and 71.8 %, saturated output powers of 40.3 and 41.9 dBm, and second harmonic levels of −75.6 and −49.4 dBc at 2.3 and 3.35 GHz, respectively. Furthermore, the DEs remain above 65 % in the two frequency bands of 2.2-2.5 and 3.3-3.45 GHz.