Ka-band, 30 watts solid state power amplifier

Escalera, N.; Boger, W.; Denisuk, P.; Dobosz, J.

doi:10.1109/mwsym.2000.861123

Cited by 10 publications

(8 citation statements)

References 1 publication

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“…SSPA failures tend to occur because of extended use and high heat loads. Overall, SSPAs are considered advantageous in terms of mass and cost but are not as efficient as TWTAs at high frequencies . In the near future, GaN SSPAs are expected to deliver high efficiencies at a reduced size, cost, and with improved thermal performance compared with GaAs SSPAs .…”

Section: Resultsmentioning

confidence: 99%

“…There are several advantages that encourage the use of SSPA technology over other amplifier types. The basic SSPA RF module is comparatively smaller in mass, more compact, lower in cost, and has superior intermodulation performance to provide higher linearity . SSPAs are also considered safer for personnel in comparison with the TWT.…”

Section: Solid‐state Power Amplifiersmentioning

confidence: 99%

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

Lohmeyer

Aniceto

Cahoy

2015

Int. J. Satell. Commun. Network.

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SUMMARYThis study captures the state of current satellite transponder technology, specifically, solid-state power amplifiers (SSPAs) and traveling wave tube amplifiers (TWTAs), and describes expected future advances, including GaN SSPAs. The findings of five previous SSPA and TWTA studies, including the 1991 European Space and Technology Center study, the 1993 National Aeronautics and Space Administration study, and three Boeing studies conducted in 2005, 2008, and 2013, are tabulated and summarized. The results of these studies are then compared with new analyses of two validated sources of amplifier data: a commercially licensed database, Seradata's Spacetrak, and a publicly available database, Gunter's Space Page. The new analyses consider a total of 18,902 amplifiers (6428 TWTAs, 2158 SSPAs, and 10,316 unspecified amplifiers) onboard 565 communications satellites launched from 1982 to 2016. This new study contains the largest number of satellites and amplifiers to date and compares output power, redundancy, and bandwidth capabilities. We find an increase in output power from the 1993 study of >200% for Ku-band TWTAs and C-band SSPAs, and >1000% increase for C-band TWTAs. The ratio of operational to redundant amplifiers is 10 times higher for TWTAs than SSPAs, and the majority of amplifiers over the past 30 years operate with bandwidth less than 100 MHz. A second analysis is conducted using failure records and telemetry of 16 geostationary satellites equipped with 659 amplifiers: 535 SSPAs and 124 TWTAs. We find that <2% of TWTAs and 5% of SSPAs experience anomalies. Overall, this research was performed to update and clarify how the power and bandwidth needs and redundancy trends of the SatCom community have evolved over the past 30 years.

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Section: Resultsmentioning

confidence: 99%

Section: Solid‐state Power Amplifiersmentioning

confidence: 99%

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

Lohmeyer

Aniceto

Cahoy

2015

Int. J. Satell. Commun. Network.

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“…But because of their similarity in signal handling it is expected that systems arguments made for the QO amplifier below may also apply to the 30 W circuit-combined amplifier, including arguments on spurious-free dynamic range. 30 W output at 31 GHz [7]. The advantage of QO amplifiers compared to the MIC circuit-combined approach is size and cost.…”

Section: Competing Power Amplifier Technologymentioning

confidence: 99%

System characteristics of quasi-optical power amplifiers

Brown

Harvey²

2001

IEEE Circuits Syst. Mag.

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A bstract-Quasi-optical (QO) amplifiers have advanced to the point where they are competitive with other solid state and vacuum-based power amplifier technologies in the upper microwave and millimeter-wave bands. While still trailing in power-added efficiency, the QO amplifiers have advantages over traditional system architectures because of superior linearity, low noise, high spurious-free dynamic range, and added functionality (e.g., electronic beam steering). These advantages are stated in the present paper through a set of scaling laws that describe the behavior of fundamental amplifier properties versus the number n of elements in the QO array. It is known that the gain and power-added efficiency are scale independent, so that the output power scales as n 1 . Here we find that the white noise figure is scale independent and the 3rd order intercept point increases as n 3/2 . Hence, the spurious-free dynamic range (SFDR) should scale as n 1 . This makes QO amplifiers attractive as "robust" low-noise amplifiers (LNAs) in traditional superheterodyne receivers. An analysis is carried out to predict the improvement in total SFDR of a superheterodyne receiver having a QO LNA at the front end. Figure 2. Two types of quasi-optical amplifier: (a) spatial array, and (b) grid.

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“…The power-combining technology is usually used to combine power from multiple devices to obtain the desired power level, which is very important in the development of high-power solid-state power amplifier [1,2]. Due to its characteristics of high power-combining efficiency and wide bandwidth, ridged waveguide is employed in some power divider/combiner designs [3,4,5,6,7,8].…”

Section: Introductionmentioning

confidence: 99%

A compact high-efficiency power divider/combiner based on quadruple-ridged waveguide

Zhou

Wang

et al. 2016

IEICE Electron. Express

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A compact high-efficiency four-way divider/combiner based on quadruple-ridged waveguide is presented. This divider/combiner designed at 31-38 GHz is mainly composed of the quadruple-ridged transition, which features four-way power divider/combiner as well as transition from waveguide to microstrip. The measured power-combining efficiency of this circuit at 34 GHz is up to 91%, and the combining efficiency is higher than 80% at 31-38 GHz.

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Ka-band, 30 watts solid state power amplifier

Cited by 10 publications

References 1 publication

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

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

System characteristics of quasi-optical power amplifiers

A compact high-efficiency power divider/combiner based on quadruple-ridged waveguide

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