This study integrates offshore wind power and wave generation technologies to build a multi-energy complementary renewable energy system, which provides references for marine clean development is highly consistent with the global sustainable goals. The platform consists of UMaine VolturnUS-S semi-submersible group flap-type converters. A 15 MW turbine installed on platform. hydrodynamic model established using AQWA. Combined upper load, fully coupled time domain integrated constructed...

An analytic theory for dual-input outphasing power amplifiers that incorporate in one unified treatment, the continuum of solutions combining including Doherty and Chireix modes is presented. This developed at current-source reference planes reveals performance trade-off achieved by all possible amplifier (PA) combiners within solutions. Furthermore, it identifies a novel type hybrid Chireix-Doherty PA combines key features operations such fundamental drain voltages applied to both main...

The study focuses on a semi-submersible wind-wave integrated power-generation platform, which consists of an OO-Star platform equipped with DTU 10 MW wind turbine and set wave energy converters. A hydrodynamic model was established using ANSYS-AQWA (2023 R1), by incorporating upper loads utilizing the open-source program F2A, fully coupled time-domain constructed. primary objective is to explore interaction mechanisms between lower devices under combined effects irregular waves turbulent...

A new type of wideband dual-input hybrid Doherty outphasing power amplifier (HDO-PA) is developed in which the load-modulation scheme continuously converts as frequency increase, from previously reported HDO-PA mode with maximum flat efficiency response versus to conventional PA mode. For a symmetric implementation, this corresponds peak-to-backoff fundamental voltage ratio auxiliary linearly varying 9/7 2 frequency. transmission-line-based prototype first established at current-source...

A newly calibrated testbed based on a commercial vector network analyzer (VNA) is proposed for the fast in-band signal characterization and linearization of nonlinear multiport devices. The can acquire both CW wideband modulated periodic signals without breaking contact with DUT, in up to five channels. time-domain measurements are made possible by calibrating all receivers frequency domain. This calibration provides phase amplitude correction modulation tones incident reflected waves...

This article presents the architecture and design methodology for a new type of dual-band Doherty power amplifier (DB-DPA), referred to as 3-Way DB-DPA, which consists main each band an auxiliary handling both bands. The DB-DPA improves average drain efficiency in concurrent operation compared traditional 2-Way by avoiding early clipping amplifiers, while benefiting from load—pulling (PA). improvement is verified theory simulation at current-source reference planes measurement with...

A novel frequency-agile power amplifier (PA) designed with a modified class-J theory enforcing constant maximum and minimum instantaneous drain voltages for all frequencies is presented. The resulting high-efficiency mode that requires reconfigurable supply exhibits clockwise fundamental- second-harmonic load impedance trajectories versus frequency facilitating the PA design. This clockwise-loaded (CLCJ) enables capability enhanced efficiency when proper voltage codesigned fundamental...

A novel design theory and the methodology are presented for dual-input Doherty power amplifiers (DPAs) in which auxiliary transistor does not fully turn off at backoff power. Given input parameters selected by PA designer, a load modulation behavior is exactly implemented current-source reference planes of transistors solving characteristic impedance quarter-wave transformer common load. The output combiner package plane that sustains desired DPA performance then synthesized using nonlinear...

This work introduces a novel design theory for single-input hybrid Doherty power amplifier (PA) inspired by the space existing within previously reported dual-input Doherty–Chireix (outphasing) continuum. Unlike conventional <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\lambda /4$ </tex-math></inline-formula> PA inverter which only performs correct load modulation at its center frequency, (HD...

This paper presents a novel method for the direct design of asymmetric Doherty power amplifiers (PAs). Single-transistor class F and C simulations main auxiliary respectively are first performed at both peak backoff powers using intrinsic IV characteristics. A 1-D transcendental equation is then solved to create prototype reference planes. The output combiner package planes finally obtained non-linear embedding. implemented in an automatic algorithm, which produces functional DPA typically...

This paper presents a two-way hybrid Doherty-outphasing power amplifier (HD-OPA) with an optimal efficiency. The HD-OPA consists of main PA operating in class-F and auxiliary class-C which jointly operate the Doherty mode at lower outphasing higher power. peak to backoff fundamental drain voltage ratio is optimized such that transistors both deliver their maximum As result, angles between two inputs need be changed dynamically dual-input level. concept validated by fabricated 2.08 GHz...

This paper presents the first experimental investigation of a broadband outphasing power amplifier designed in 150nm GaN process utilizing Doherty-Chireix Continuum. Simulations show peak drain efficiency above 35% from 3.5-7 GHz. Peak was measured to be 53% when using pulsed-RF signal at 3.5 GHz with pulse width 1μs and duty rate 0.1%. Series inductors shunt capacitors were used minimize total die area. The has area 3mm x 4mm.

The inspection of the current and voltage waveforms at source reference planes transistor models provides power amplifier (PA) designers with useful insights for identifying class operation PAs. However when a specific plane is targeted, time-consuming multi-harmonic load- source-pull simulations are required. Alternatively if design started targeted PA architecture, load terminations package given level can be calculated in single simulation help an embedding device model. application model...

Waveform engineering is commonly used to optimize the power efficiency, linearity and output of amplifiers (PA). In this search for optimal waveforms, PA designers have become interested in knowing internal mode operation device at current-source reference-planes. However given huge space input multi-harmonic terminations required find desired it much desirable use a nonlinear embedding model readily obtain voltage current waveforms transistor measurement (package or extrinsic)...

This paper reviews a narrow and wide band high-efficiency dual-input power amplifiers (PA) design approach based on the previously reported Doherty-Outphasing PA continuum theory. The key derived analytic equations are summarized to explain Several GaN demonstrator circuits presented experimentally evaluated. promising performance achieved validates usefulness of DohertyOutphasing

A broadband bandpass filter with a dual-plane structure is proposed. The consists of pair L shaped microstrip feed lines on the top layer and triple-mode defected ground resonator (TMDGSR) bottom layer. Electric field distributions frequency response TMDGSR are investigated. sample using 31.9% 3-dB relative bandwidth at centre 3.6 GHz fabricated measured. simulation measurement results show that has some advantages such as: simple compact broadside coupling easily, which very useful in DGS...

This paper reviews the accelerated design of power amplifiers (PA) using a nonlinear embedding device model. Examples practical application to Class F, continuous Class-J and Chireix PAs are presented together with use graphic interface (GUI) for automatic dual-input Doherty PAs. Preliminary simulation results on operating in class E at current-source reference planes also reported. A modified model is used this purpose.

In this paper, we investigated the dynamics of interaction between Microcystis aeruginosa and filter-feeding fish in a new aquatic ecological model considered effects aggregation harvesting focused on studying critical threshold conditions through analysis saddle-node bifurcation, Hopf Bogdanov–Takens bifurcation. We also conducted numerical simulations to illustrate our findings provided biological interpretations. The results obtained indicate that effect or can disrupt coexistence fish....

The second-harmonic input impedance plays a critical role on the performance of GaN power amplifiers. In recent paper, drain efficiency enhancement for continuous-mode amplifiers was reported to be achieved using active broadband injection at PA input. this strategy selecting and necessity in such PAs are discussed detail. Additionally, methodology designing an embedded diplexer matching network is reported. Finally, importance phase signal injected demonstrated both CW modulated signals...