Design of High Power Density Amplifiers: Application to Ka Band

Passi, Davide; Leggieri, Alberto; Paolo, Franco Di; Bartocci, Marco; Tafuto, Antonio

doi:10.1007/s10762-017-0402-1

Cited by 13 publications

(10 citation statements)

References 22 publications

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“…Dimensions and weight are two of the most important features in satellite applications which is why this architecture was chosen. The combining efficiency is not the maximum achievable with current systems, such as radial combiners [19][20][21][22][23][24], but the power-to-weight ratio and power density are definitely the best in literature up to this point, as shown in [8]. To conclude, multiphysics simulations certify the suitability of the system for space environments.…”

Section: Introductionmentioning

confidence: 93%

“…Spatial Power Combining techniques have become one of the most reliable and efficient techniques of millimeter-wave power combination. Reaching high powers in small volumes with high fault tolerances, Spatial Power Amplifiers (SPA) are the perfect candidates to replace high power Vacuum Tubes (VT) [1][2][3][4][5][6][7][8][9][10][11][12], especially in space environments. The only field in which vacuum tube technology remains unmatched is in the production of very high pulsed power [13].…”

Section: Introductionmentioning

confidence: 99%

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High Power Density Spatial Combiner for the Q-Band, Ready for Space Applications

Fantauzzi¹,

Valletti²,

Paolo³

2022

PIER M

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This paper outlines the design characterization and electromagnetic performance of a millimeter-wave high power combining structure, which exploits the spatial power combination technique. The input matching is always below 10 dB over the entire Q band, and the overall weight of the structure is about 500 g. Multiphysics simulations show how this structure is suitable for the most challenging space missions that will arise in next few years. In fact, 100 W of RF power above the frequency of 40 GHz can be delivered while all the specifications for satellite payloads are complied. Other Spatial Power Combiner structures, such as Radial ones, cannot be implemented in space missions since they are much less compact and much heavier than the one presented in this article, and this is the major advantage of this configuration which was specially designed for a space project.

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Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

High Power Density Spatial Combiner for the Q-Band, Ready for Space Applications

Fantauzzi¹,

Valletti²,

Paolo³

2022

PIER M

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“…The electromagnetic analysis of the back to back configuration is particularly useful in order to test the final matching of the structure, also verifying that no oscillations are triggered [16]. By imposing a stimulus, on either input and output port (of the structure depicted in figure 3), that agrees with the spatial arrangement of the fondamental mode TE10, a scattering parameteres analysis of the complete passive system was performed.…”

Section: Divider By 8 Back To Backmentioning

confidence: 99%

Virtual Prototype of Innovative Ka-Band Power Amplifier Based on Waveguide Polarizer

Fantauzzi

Valletti

Paolo

2020

AEM

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This paper outlines an innovative approach to design a spatial power-combining structure based on waveguide polarizers. It presents the 3D CAD model of the new structure with the transversal probes and considerations in positioning and optimization of them. Exploiting the transformation of the dominant input mode TE10 into an elliptically polarized wave, provided by the polarizer, it has been possible to achieve a division of power by eight, completely carried out in space. With the insertion of the transversal probes made by microstrips, the RF signal can be sent to the MMIC solid state power amplifiers, and then recombined in the output section. Thanks to the large number of power divisions made in the waveguide section, the insertion loss of the power divider/combiner is less than 0.5 dB across the 32-34 GHz band, achieving a great power density as well. At the Author’s best knowledge, this is the first work where a waveguide polarizer is used in Spatial Power Combining technology.

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“…The structure proposed in this work was intended to be integrated with four external power amplifiers [32] in a future application. For this purpose, a first unit was adopted to divide the input signal among the four amplifiers and then, a second unit, recombined their outputs for obtaining a very high-power amplification stage.…”

Section: E-plane Bendmentioning

confidence: 99%

“…The design of this combiner was made with the aim of using four spatial power amplifiers (SPAs), each one providing nearly 50 W of output power in the 32-38 GHz band, using 16 gallium-arsenide (GaAs) MMICs [32]. A representation of the complete assembled high-power amplifier (HPA) is shown in Figure 9.…”

Section: Power Handling Capability Estimationmentioning

confidence: 99%

Full-Band Oversized Turnstile-Based Waveguide Four-Way Power Divider/Combiner for High-Power Applications

et al. 2019

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Very high-power and high-efficiency microwave applications require waveguide structures to combine/divide the power from/to a variable number of high-power solid-state devices. In the literature, among the different waveguide configurations, those capable of providing the maximum output power show a limited relative bandwidth. To overcome this limitation, in this paper a full-band (40%) waveguide power divider/combiner specifically designed for high-power applications (up to several kW) is presented. The proposed structure uses an evolved turnstile junction with a standard rectangular waveguide common port, rotated 45°, with respect to its central axis, to divide/combine the signal to/from the four output/input rectangular ports. The inclusion of an oversized central cavity together with circular and rectangular waveguide impedance transformers at the common port allows the achievement of a full-band operation with excellent electrical performance, while maintaining a very simple and compact configuration. Only two layers of metal are required for the physical implementation of this structure in platelet configuration. A prototype has been designed covering the full Ka-band (26.5–40 GHz), showing an excellent measured performance with around 30 dB of return loss, 0.18 dB of insertion loss, and less than 1.5° of phase imbalance.

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Design of High Power Density Amplifiers: Application to Ka Band

Cited by 13 publications

References 22 publications

High Power Density Spatial Combiner for the Q-Band, Ready for Space Applications

High Power Density Spatial Combiner for the Q-Band, Ready for Space Applications

Virtual Prototype of Innovative Ka-Band Power Amplifier Based on Waveguide Polarizer

Full-Band Oversized Turnstile-Based Waveguide Four-Way Power Divider/Combiner for High-Power Applications

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