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Concurrent dual-band Doherty power amplifier using a novel dual-band bandpass filter for wireless technologies

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Abstract

This paper proposes a novel design methodology for dual-band Doherty power amplifier (DPA) with a novel dual-band bandpass filter and quad-section stepped impedance resonators. This design rejects the annoying frequencies of the second and third harmonics in the dual-band and contributes greatly to efficiency improvement of DPA. The methodology is validated with the design, simulation, implementation and experimentation of a 10 W GaN-based DPA for global system for mobile communications and worldwide interoperability for microwave access (WiMAX) applications at 1.84 GHz and 3.5 GHz, respectively. In the measurement results, the DPA achieves a drain efficiency (DE) of 55.5% with an output power of 38.2 dBm and power gain is 16.2 dB at the 6.1 dB output power back-off (OBO) from a saturated output power at 1.84 GHz. Furthermore, the DPA achieves a DE of 46.2% with an output power of 36.15 dBm, and power gain is 10 dB at the 6.1 dB OBO at 3.5 GHz. Using a10-MHz 16-QAM signal at 1.84 GHz and a 5-MHz WiMAX signal at 3.5 GHz, the linearity results show an adjacent channel leakage ratio of − 46.9 and − 44.3 dBc with the average output power of 37.6 and 36.1 dBm at 1.84 and 3.5 GHz, respectively.

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Authors and Affiliations

  1. Department of Electrical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran

    Shaban Rezaei Borjlu & Massoud Dousti

  2. Department of Electrical Engineering, Khajeh Nasir Toosi University, Tehran, Iran

    Davud Asemani

Authors
  1. Shaban Rezaei Borjlu
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  2. Massoud Dousti
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  3. Davud Asemani
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Correspondence to Massoud Dousti.

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Rezaei Borjlu, S., Dousti, M. & Asemani, D. Concurrent dual-band Doherty power amplifier using a novel dual-band bandpass filter for wireless technologies. Analog Integr Circ Sig Process 96, 395–408 (2018). https://doi.org/10.1007/s10470-018-1187-4

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  • DOI: https://doi.org/10.1007/s10470-018-1187-4

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