| Title | Highly Efficient Balanced Power Amplifiers for Carrier Aggregation |
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| Authors | Olukoya, O. and Budimir, D. |
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| Abstract | This paper presents a highly linear balanced power amplifier with miniaturised quadrature hybrid coupler for carrier aggregation (CA). The miniaturised quadrature coupler is designed using a novel U-shaped transmission line (USTL) concept to achieve good size reduction. The novel branch-line coupler is used to design a wideband balanced PA. The performance of the balanced PA is compared to a single PA solution. The balanced PA shows better performance with improved matching properties and better electrical stability. There was an increase in saturated maximum output power (Pout) from 8 dBm for the individual PA to 13.41 dBm for the balanced with a power aided efficiency (PAE) of 43.92%. The highly linear balanced PA achieves a 14 dB ACPR reduction and also improves ACPR by 12 dB for non-contiguous and 9 dB for contiguous carrier aggregation. |
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| Keywords | ACPR (Adjacent Channel Power Ratio); U-Shaped Transmission line (USTL); Quadrature Hybrid Couplers; Contiguous/Non-contiguous CA; Power Aided Efficiency (PAE). |
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| Journal | Microwave and Optical Technology Letters |
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| Journal citation | 60 (3), pp. 529-534 |
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| ISSN | 0895-2477 |
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| Year | 2018 |
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| Publisher | Wiley |
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| Accepted author manuscript | |
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| Digital Object Identifier (DOI) | https://doi.org/10.1002/mop.31014 |
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| Web address (URL) | https://www.westminster.ac.uk/wireless-communications-research-group |
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| Publication dates |
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| Published | 05 Feb 2018 |
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| Published in print | Mar 2018 |
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