A planner Doherty power amplifier with harmonic suppression with open and short ended stubs

Lotfi, Saeedeh; Roshani, Saeed; Roshani, Sobhan; Gilan, Maryam Shirzadian

doi:10.1515/freq-2021-0109

Cited by 10 publications

(5 citation statements)

References 30 publications

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“…This power divider equally splits the input power (port 1) into two equal-phase output signals (port 2 and port 3), maintaining matched states and offering isolation between the output ports. The formulas below demonstrate how to calculate the Wilkinson power divider parameters [27][28][29][30][31][32][33][34][35][36][37][38][39][40][41]:…”

Section: Design Of Wilkinson Power Dividermentioning

confidence: 99%

Highly Efficient GaN Doherty Power Amplifier for N78 Sub-6 GHz Band 5G Applications

Eid,

Abouelnaga,

Ibrahim

et al. 2023

Electronics

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In this paper, a high-efficiency GaN Doherty power amplifier (DPA) for 5G applications in the N78 sub-6 GHz band is introduced. The theoretical analysis of the matching networks for the peak and carrier transistors is presented, with a focus on the impact of unequal power splitting for both transistors and the recommendation of a post-harmonic suppression network. The proposed design features an unequal Wilkinson power divider at the input and a post-harmonic suppression network at the output, both of which are crucial for achieving high efficiency. The Doherty power amplifier comprises two GaN 10 W HEMTs, measured across the 3.3 GHz to 3.8 GHz band (the N78 band), and the results reveal significant improvements in gain, output power, drain efficiency, and power-added efficiency. Specifically, the proposed design achieved a power gain of over 12 dB and 42 dBm saturated output power. It also achieved a drain efficiency of 80% at saturation and a power-added efficiency of 75.2%. Furthermore, the proposed harmonic suppression network effectively attenuated the harmonics at the output of the amplifier from the second to the fourth order to more than −50 dB, thus enhancing the device’s linearity.

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Section: Design Of Wilkinson Power Dividermentioning

confidence: 99%

Highly Efficient GaN Doherty Power Amplifier for N78 Sub-6 GHz Band 5G Applications

Eid,

Abouelnaga,

Ibrahim

et al. 2023

Electronics

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“…Using open stubs [6,22] and diferent shaped resonators [7] are also common techniques for obtaining rejection band in the couplers and power dividers. Each open stub can provide a transmission zero, which its frequency is dependent on its length [23]. In [24], four open stubs are used in middle of the QHC main branches to obtain rejection band for the designed device, which operates at 0.9 and 2 GHz frequencies.…”

Section: Introductionmentioning

confidence: 99%

Design of a Microwave Quadrature Hybrid Coupler with Harmonic Suppression Using Artificial Neural Networks

Roshani,

Yahya,

Assaad

et al. 2024

Active and Passive Electronic Components

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In this paper, a compact and simple structure of an elliptic microstrip lowpass filter (LPF) is designed for harmonic suppression in microwave quadrature hybrid coupler (QHC) applications. A radial resonator and a rectangular resonator are used to produce an elliptic LPF. The proposed LPF is used on the outer sides of the branch line coupler, which has improved the coupler harmonic suppression. Furthermore, artificial neural networks (ANNs) are incorporated to improve the LPF design process. The LPF best structure is obtained using the proposed ANN model. The proposed LPF has a compact size, which only occupies 16.4 mm × 7.3 mm equals to 0.164 λg × 0.073 λg, has a cut frequency of 2.2 GHz, and shows a sharp transmission band with a roll-off rate of 158.3 dB/GHz. Finally, the deigned QHC operates correctly at 1 GHz, which shows high harmonic suppression ability. The proposed QHC provides wide suppression band from 2.25 GHz up to more than 14 GHz, which can effectively suppress 3rd, to 14th harmonics. The proposed coupler features desirable parameters of S11, S21, S31, and S41, with magnitude of −21 dB, −3.4 dB, −3.3 dB, and −22.5 dB, at the operating frequency. The proposed approach mitigates the complexity of the circuit fabrication, compared with the previous methods while achieved desirable performances for the proposed QHC.

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“…Active load modulation, such as that provided by the Outphasing power amplifier (OPA) and the Doherty power amplifier (DPA), is a promising technique to boost efficiency at the power back-off region [6][7][8]. Over the past few years, the DPA has been the most popular PA architecture used in wireless communication systems [8,9]. However, the bandwidth of the DPA needs to be further improved to support 5G/6G communications.…”

Section: Introductionmentioning

confidence: 99%

“…In a DPA, the most important part is the impedance inverter, which is used to realize correct load modulation between the carrier and peaking PAs [9]. However, it has been demonstrated in many works that the impedance inverter significantly limits the bandwidth of the DPA [10,11].…”

Section: Introductionmentioning

confidence: 99%

Design of Ultra-Wideband Doherty Power Amplifier Using a Modified Combiner Integrated with Complex Combining Impedance

Chen

Liu

Dong

et al. 2023

Sensors

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To be compatible with future wireless communication systems, it is very necessary to extend the bandwidth of the Doherty power amplifier (DPA). In this paper, a modified combiner integrated with a complex combining impedance is adopted to enable an ultra-wideband DPA. Meanwhile, a comprehensive analysis is performed on the proposed method. It is illustrated that the proposed design methodology can provide power amplifier (PA) designers with more freedom in implementing ultra-wideband DPAs. As a concept of proof, a DPA working over 1.2–2.8 GHz (a relative bandwidth of 80%) is designed, fabricated and measured in this work. Experimental results showed that the fabricated DPA delivers a saturation output power of 43.2–44.7 dBm with a gain of 5.2–8.6 dB. Meantime, the fabricated DPA achieves a saturation drain efficiency (DE) of 44.3–70.4% and a 6 dB back-off DE of 38.7–57.6%.

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A planner Doherty power amplifier with harmonic suppression with open and short ended stubs

Cited by 10 publications

References 30 publications

Highly Efficient GaN Doherty Power Amplifier for N78 Sub-6 GHz Band 5G Applications

Highly Efficient GaN Doherty Power Amplifier for N78 Sub-6 GHz Band 5G Applications

Design of a Microwave Quadrature Hybrid Coupler with Harmonic Suppression Using Artificial Neural Networks

Design of Ultra-Wideband Doherty Power Amplifier Using a Modified Combiner Integrated with Complex Combining Impedance

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