Class F Power Amplifier Thesis

Class F Power Amplifier Thesis-19
To learn more or modify/prevent the use of cookies, see our Cookie Policy and Privacy Policy.ABSTRACT This thesis presents the research carried out into the effects of load and source harmonic terminations on the efficiency of a class-F power amplifier (PA).By continuing to use this site, you consent to the use of cookies.

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Three PAs were designed, one operating at 0.9 GHz and the other two at 2.45 GHz.

For the 0.9 GHz PA the load matching network was designed to obtain the required optimum impedances at the fundamental frequency, and second and third harmonics.

A demonstration on the direct integration of the class-F PA and an H-shaped patch antenna using an active integrated antenna (AIA) approach is also presented.

To obtain a high efficiency PA, it is necessary to ensure that the power dissipated in the active device is minimised and this is achieved by ensuring that the overlapping area between the drain voltage and current waveforms in the time domain is minimised.

In the first design the load and source matching networks used in the PA were employed with the H- shaped antenna replacing the 50 9 load.

In order to further minimise the size, cost, and losses, a new second AIA design was proposed.The study focused on the technique used in designing a class F PA especially at GHz frequencies. Several works on the class F PA with different semiconductor technologies from year 2001 to 2016 are discussed. For matching, a new explicit matrix input impedance formula for the H-shaped antenna has been obtained using segmentation method.Using this formula, the location of the probe feed could be adjusted to obtain the required impedance at the pre-assigned frequency.To minimise this overlapping area, optimum source and load harmonic impedances for the fundamental frequency, and second and third harmonics, are obtained using a novel application of the simulated load/source-pull method.New forms of harmonic matching networks were designed to ensure that the active device is terminated by the optimum impedances at the gate and drain for maximum efficiency.A probe feed location was found to obtain the required optimum impedance at th...Highly efficient class F power amplifier (PA) in Gigahertz (GHz) frequencies for wireless application is reviewed in this paper. The formulas for the first four mode frequencies were derived using odd and even mode analysis while a new and simpler formula for the fourth mode frequency was obtained.A systematic design approach to obtain the dimensions of the antenna is presented for an antenna operating at a given fundamental mode frequency.


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