Communication satellite power amplifiers: current and future SSPA and TWTA technologies

Lohmeyer, Whitney; Aniceto, Raichelle; Cahoy, Kerri

doi:10.1002/sat.1098

Cited by 24 publications

(16 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where τ is the RC time constant [24]. Assuming a constant reflection over the band of interest and total reflection out of band, we can simplify (1) to…”

Section: Theoretical Matching Boundarymentioning

confidence: 99%

“…These applications include intersatellite communications, medical imaging, radar, and mobile communications. In the future, solid-state technology could allow engineers to overcome common drawbacks of traditional TWTAs [1], for example, their warm-up time, limited service life, and their rather narrow usable bandwidth. These issues-especially the last pointcan be improved upon considerably using III-V semiconductors, such as gallium arsenide or gallium nitride (GaN).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Limitations and Implementation Strategies of Interstage Matching in a 6-W, 28–38-GHz GaN Power Amplifier MMIC

Neininger

John

Thome

et al. 2021

IEEE Trans. Microwave Theory Techn.

View full text Add to dashboard Cite

In this article, we summarize the theoretical matching boundaries and show the limitations they implicate for real-world amplifier design. Starting with a common schematic prototype, we investigate the question of how to realize its electrical response in a densely routed, massively parallelized layout. To that end, we develop a comprehensive study on the application of space-mapping techniques toward the design of high-power amplifiers (HPAs). We derive three reference design procedures and compare their performance in terms of convergence, speed, and practicality when laying out a densely routed HPA interstage matching network. Subsequently, we demonstrate the usefulness of the study by designing the networks of a compact three-stage eight-way wideband HPA in the Ka-band. The processed monolithic microwave integrated circuit features a 1-dB large-signal bandwidth of more than 11 GHz (a fractional bandwidth of 32.8%) and thus covers most of the Ka-band with an output power exceeding 6 W in 3 dB of gain compression. This demonstrates the highest combination of power and bandwidth to date using a reactively matched topology in the Ka-band.

show abstract

“…where τ is the RC time constant [24]. Assuming a constant reflection over the band of interest and total reflection out of band, we can simplify (1) to…”

Section: Theoretical Matching Boundarymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Limitations and Implementation Strategies of Interstage Matching in a 6-W, 28–38-GHz GaN Power Amplifier MMIC

Neininger

John

Thome

et al. 2021

IEEE Trans. Microwave Theory Techn.

View full text Add to dashboard Cite

show abstract

“…In recent years, different constellations of satellites have been proposed to provide global broadband access to internet including the Starlink supported by SpaceX with 12000 LEO satellites [8], Oneweb with 900 LEO satellites [9], and Telesat LEO with 300 to 500 satellites [10]. All these constellations are based on the conventional RF solutions for both feeder and user links operating at the Ku-band (12)(13)(14)(15)(16)(17)(18) GHz), the Ka-band (27)(28)(29)(30)(31)(32)(33)(34)(35)(36)(37)(38)(39)(40), and the Q/V band (40)(41)(42)(43)(44)(45)(46)(47)(48)(49)(50). Obviously, the bandwidth limitation remains one of the key challenges when increasing the capacity.…”

Section: Introductionmentioning

confidence: 99%

“…For high output powers, TWTAs are commonly employed, in particular at higher frequency bands, because they offer higher data rates and greater bandwidth with better efficiency than SSPAs. For lower frequency bands and for lower transmitter power applications, SSPAs are generally preferred as they exhibit higher reliability, lower mass, and better linearity [42], [49]. However, these HAPs models have two major nonlinear characteristics, namely, amplitude to amplitude modulation (AM/AM) and amplitude to phase modulation (AM/PM) conversions that should be taken into account as they can lead to severe performance degradation.…”

Section: Introductionmentioning

confidence: 99%

Performance of Multibeam Very High Throughput Satellite Systems Based on FSO Feeder Links with HPA Nonlinearity

Zedini¹,

Kammoun²,

Alouini³

2020

Preprint

View full text Add to dashboard Cite

Due to recent advances in laser satellite communications technology, free-space optical (FSO) links are presented as an ideal alternative to the conventional radio frequency (RF) feeder links of the geostationary satellite for next generation very high throughput satellite (VHTS) systems. In this paper, we investigate the performance of multibeam VHTS systems that account for nonlinear high power amplifiers at the transparent fixed gain satellite transponder. Specifically, we consider the forward link of such systems, where the RF user link is assumed to follow the shadowed Rician model and the FSO feeder link is modeled by the Gamma-Gamma distribution in the presence of beam wander and pointing errors where it operates under either the intensity modulation with direct detection or the heterodyne detection. Moreover, zero-forcing precoder is employed to mitigate the effect of inter-beam interference caused by the aggressive frequency reuse in the user link. The performance of the system under study is evaluated in terms of the outage probability, the average bit-error rate (BER), and the ergodic capacity that are derived in exact closed-forms in terms of the bivariate Meijer's G function. Simple asymptotic results for the outage probability and the average BER are also obtained at high signal-to-noise ratio.

show abstract

“…After that, the electric field of the microwave radiation interacts with the electron beam, where the kinetic energy from the electron beam gets transferred to the microwave to form more intense microwave field power [38]. deliver a device with efficiency as high as 62% when operating in high frequency Ku-band [51]. The details of the fundamental operating mechanisms and the capabilities of TWTA are elaborated in the following section.…”

Section: Comparison Between Sspa and Mvedmentioning

confidence: 99%

Development of carbon nanotubes for vacuum electronics application

Lim¹

View full text Add to dashboard Cite

First and foremost, I would like to express my deepest appreciation to my PhD supervisor, Professor Tay Beng Kang. His continuous support and guidance are highly appreciated. He has groomed and trained me, not only in the area of research, but also in working well with collaborators and other important professional aspects. I have learned a lot from him throughout this PhD study. On top of that, I would like to acknowledge the financial supports on my research project from the Economic Development Board (EDB) under the project S14-1126-NRF OSTIn-SRP; and COE Research Grant under the project M4081666. At the same time, I would also like to express my gratitude to Nanyang Technology University for the kind opportunity to receive this offer of PhD study with fully-funded scholarship. I would also like to express my appreciations to my co-supervisor, Associate Professor Sheel Aditya, for his endless guidance, especially on the areas of device simulation and manuscript writing. At the same time, I would also like to thank my TAC members, Associate Professor Miao Jianmin and Associate Professor Daniel Chua and their respective students in providing their expertise guidance and support on microfabrication and field emission measurement. My gratitude also goes to the project's external collaborator, Professor Vladimir Labunov from Belarusian State University of Informatics and Radioelectronics, for his support on the microfabrication and Carbon Nanotubes growth. Next, I would also like to thank Professor Yan Xingbin from Lanzhou Institute of Chemical Physics (Chinese Academy of Science), for his support on the synthesis and fabrication of high current density Carbon Nanotubes field emitter. iv I would also like to express my gratitude to my project members, Dr Xia Xin, Dr Wang Shaomeng, and Mr Zishan Ali; and my fellow colleagues for their kind support in various aspects in my PhD research. Last but not least, I would like to thank my family in Malaysia, who constantly provide moral supports whenever I face difficulties and bottlenecks in my research life. To my late father, thank you for everything that you have given to me. You are proud of me, I know it.

show abstract

Communication satellite power amplifiers: current and future SSPA and TWTA technologies

Cited by 24 publications

References 29 publications

Limitations and Implementation Strategies of Interstage Matching in a 6-W, 28–38-GHz GaN Power Amplifier MMIC

Limitations and Implementation Strategies of Interstage Matching in a 6-W, 28–38-GHz GaN Power Amplifier MMIC

Performance of Multibeam Very High Throughput Satellite Systems Based on FSO Feeder Links with HPA Nonlinearity

Development of carbon nanotubes for vacuum electronics application

Contact Info

Product

Resources

About