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High-performance class-E power amplifier integrated with a microstrip bandpass-filter for wireless applications

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Abstract

In this paper, a class-E power amplifier using a harmonic control network consisting of a bandpass filter and a harmonic control circuit is presented. The advantage of using the bandpass filter in the harmonic control network is the elimination of the DC-block capacitor between the transistor and the load. As a result, losses due to this capacitor are eliminated at operating frequencies. In this design, a new narrow bandpass filter is used with a practical central frequency of 2.4 GHz. The filter carries the maximum power to the load due to its low insertion loss. On the other hand, the harmonic control circuit comprises a tunable elliptic resonator, which resonated in the third harmonic and a quadratic wavelength line, which controls the even harmonics. The input impedance of the harmonic controller circuit is also controlled by a microstrip transmission line that minimizes the parasitic effects of the transistor output. This design is fabricated and measured on the RO4001 board. The maximum measured power output of this narrow-band amplifier is 24 dBm, with 72% power added efficiency.

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source voltage waveform, (c) Current waveform of the transistor (d) the stability factors of the proposed power amplifier

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Authors and Affiliations

  1. Electrical Engineering Department, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran

    Behnam Afzali, Farzin Shama & Hamed Abbasi

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  1. Behnam Afzali
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  2. Farzin Shama
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  3. Hamed Abbasi
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Correspondence to Farzin Shama.

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Afzali, B., Shama, F. & Abbasi, H. High-performance class-E power amplifier integrated with a microstrip bandpass-filter for wireless applications. Analog Integr Circ Sig Process 107, 121–133 (2021). https://doi.org/10.1007/s10470-021-01817-y

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  • DOI: https://doi.org/10.1007/s10470-021-01817-y

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