A 5-W GaN Doherty Amplifier for <i>Ka</i>-Band Satellite Downlink With 4-GHz Bandwidth and 17-dB NPR

Piacibello, Anna; Giofrè, Rocco; Quaglia, Roberto; Figueiredo, Ricardo; Carvalho, Nuno Borges; Colantonio, Paolo; Valenta, Václav; Camarchia, Vittorio

doi:10.1109/lmwc.2022.3160227

Cited by 23 publications

(10 citation statements)

References 17 publications

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“…Note that when θ T = 0, Θ 3dB θ T can be approximated by Θ 3dB (defined in (57)) through small angle approximation [31]. Values of A b,Θ bw when Θ bw = 10 • , 30 • and 60 • are shown in Table V which is calculated by (17). Also, values of A n,Θ 3dB θ T when beam steering angle is n,Θ bw denoted as the minimum number of beams that the "narrow-beam" beamformer is needed to cover the beam service areas of "broadened-beam" beamformer A b,Θ bw .…”

Section: Channel Capacity Evaluationmentioning

confidence: 99%

“…In SAT applications, beamformer design with CMC is desired to enable power amplifiers (PAs) to operate at near compression points for maximizing efficiency [14]- [16]. PA efficiency is essential to reduce power consumption [14], especially on SAT where only limited power resources are available [17]. Also, high PA efficiency prevents wasted power that generates heat, potentially leading to circuitry overheating [15].…”

Section: Introductionmentioning

confidence: 99%

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Waveform Optimization for Multiple Beam Communications under Radar Constant Modulus Constraints

Zhou¹,

Xie²,

Liu³

et al. 2021

2021 IEEE Wireless Communications and Networking Conference (WCNC)

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Satellite communications (SatComs) are anticipated to provide global Internet access. Low Earth orbit (LEO) satellites (SATs) have the advantage of providing higher downlink capacity owing to their smaller link budget compared with medium Earth orbit (MEO) and geostationary Earth orbit (GEO) SATs. In this paper, beam-broadening algorithms for uniform rectangular arrays (URAs) in LEO SatComs were studied. The proposed method is the first of its kind that jointly considers the path loss variation from SAT to user terminal (UT) due to the Earth's curvature to guarantee quality of service (QoS) inspired by the synthesis of isoflux radiation patterns in the literature, constant modulus constraint (CMC) favored for maximizing power amplifier (PA) efficiency, and out-ofbeam radiation suppression to avoid interference. A URA design problem is formulated and decomposed into two uniform linear array (ULA) design subproblems utilizing the idea of Kronecker product beamforming to reduce the computational complexity of designing URA. The non-convex ULA subproblems are solved by a convex iterative algorithm. Simulation results reveal the advantages of the proposed method for suppressing out-of-beam radiation and achieving design criteria. In addition, channel capacity evaluation is carried out and shows that the proposed "broadened-beam" beamformers can offer capacities that are at least four times greater than "narrow-beam" beamformers employing an array steering vector when beam transition time is taken into account. The proposed method holds potential for LEO broadcasting applications such as digital video broadcasting (DVB).Index Terms-Satellite communications (SatComs), low Earth orbit (LEO) satellite, beampattern synthesis, beam-broadening algorithm, isoflux radiation pattern, constant modulus constraint (CMC), Kronecker product beamforming, uniform rectangular array (URA), uniform linear array (ULA), Digital video broadcasting (DVB).

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Section: Channel Capacity Evaluationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Waveform Optimization for Multiple Beam Communications under Radar Constant Modulus Constraints

Zhou¹,

Xie²,

Liu³

et al. 2021

2021 IEEE Wireless Communications and Networking Conference (WCNC)

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“…Power amplifier (PA), as the core module of modern wireless communication system, with its performance, for example, the output power (

P_{italicout}

) and power added efficiency (

PAE

), can greatly affect the overall performance of the entire communication systems 1–3 . Thus, in order to improve the quality of the communication system, a series of high‐performance PAs with different types of classes and topologies have been proposed over the years, such as class F, 4–7 class J, 8–10 Doherty PA, 11–15 outphasing PA, 16–18 and load modulated balanced amplifier (LMBA), 19–21 and good performance have been obtained.…”

Section: Introductionmentioning

confidence: 99%

Development and validation of a novel bias network design method for a class AB PA

Crupi

Donato

et al. 2023

Int J Numerical Modelling

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In this paper, the impact of the bias networks on a radio frequency (RF) power amplifier (PA) is analyzed and discussed comprehensively. Both the different sizes and positions of the bias microstrip line circuit have been studied for a broadband class AB PA. Both simulations and measurements show that the performance of the PA can be greatly improved with the adjustment of the bias circuit by effecting the harmonic impedance of the whole matching circuit. Compared with the existing works, the fabricated PA based on the proposed technique provides the best performance, thereby demonstrating the effectiveness of the developed bias circuit optimization method.

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“…Among the architectures based on load modulation, the Doherty PA (DPA) has found widespread application in the sub-6 GHz range [2], and it is nowadays being investigated at microwaves in the form of Microwave Monolithic Integrated Circuits (MMICs) [3]. In classical DPAs, the input signal is split by a 90-degree quadrature hybrid in order to feed an auxiliary (peaking) PA aimed at modifying the output impedance of a main PA at high power.…”

Section: Introductionmentioning

confidence: 99%

Automatic Optimization of Input Split and Bias Voltage in Digitally Controlled Dual-Input Doherty RF PAs

et al. 2022

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Digitally controlled Dual-Input Doherty Power Amplifiers (DIDPAs) are becoming increasingly popular due to the flexible input signal splitting between the main and auxiliary stages. Nevertheless, the presence of many degrees of freedom, e.g., input amplitude split and phase displacement as well as biasing for multiple stages, often involves inefficient trial-and-error procedures to reach a suitable PA performance. This article presents automated parameter setting based on coordinate descent or Bayesian optimizations, demonstrating an improvement in the performance in terms of RF output power and power-added efficiency (PAE) in the presence of broadband-modulated signals, yet maintaining suitable linear behavior for, e.g., communications applications.

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A 5-W GaN Doherty Amplifier for Ka-Band Satellite Downlink With 4-GHz Bandwidth and 17-dB NPR

Cited by 23 publications

References 17 publications

Waveform Optimization for Multiple Beam Communications under Radar Constant Modulus Constraints

Waveform Optimization for Multiple Beam Communications under Radar Constant Modulus Constraints

Development and validation of a novel bias network design method for a class AB PA

Automatic Optimization of Input Split and Bias Voltage in Digitally Controlled Dual-Input Doherty RF PAs

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