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This paper introduces a method for improving the bandwidth of GaN class-F PAs. The key idea behind this broadband class-F PA lies in the bandpass filter (BPF) used at the input matching network of a conventional class-F PA. Harmonic impedance optimization at the input of the FET is performed in order to design the BPF. Theoretical and experimental results verified the proposed method.
In this paper the application of adaptive matching networks for efficiency enhancement of class-E and class-F power amplifiers will be presented. These networks are capable of synthesizing the optimum impedance at the fundamental frequency as well as the suitable terminations at the harmonics. Additionally they use only transmission lines and capacitors, making them suitable for high power applications...
We designed, simulated and fabricated an active integrated antenna based on an infinite wavelength composite right/left-handed metamaterial structure. Due to its nonlinear dispersion characteristic, the realized antenna does not show a resonance behavior at the second and third harmonic. This property can be exploited for the profitable termination of the higher harmonics as used in class-F or inverse...
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