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L-3 Communications Electron Technologies (L-3 ETI) has recently tested a unit from the production family of Ku-band TWTs, the 88151HXR S/N 110, up to 200-W RF output power in thermal vacuum. Performance data and thermal analysis from the testing will be presented.
L-3 Communications Electron Technologies Inc., (L-3 ETI), continues to push the envelope for spacedownlink qualified mm-wave helix TWTs. We report results of high-power, wide bandwidth, and extreme environmental margin testing on the mm-wave family of helix TWTs from 22 GHz to 75 GHz.
A W-band sheet-beam extended interaction klystron (EIK) has been fabricated and tested. The EIK integrates a 3-cavity circuit with our previously demonstrated 20-kV, 3.5-A beamstick. The EIK has produced a saturated peak output power of over 7.5 kW and a small-signal gain of almost 40 dB, in very good agreement with our simulations.
A 0.850 THz vacuum electronic power amplifier capable of >50 mW output power is being tested at Northrop Grumman Electronic Systems. The compact power amplifier is based on a DRIE-fabricated folded waveguide slow-wave circuit, together with a high current density thermionic cathode, a high field permanent magnet solenoid, and a single-stage depressed collector for overall device efficiency. The...
In recent years an exciting progress has been made in developing scandate cathodes that have excellent emission properties at a lower operating temperature comparing to the traditional sintered tungsten dispenser cathodes, and consequently a significantly longer life. The initial results look very promising for the development of millimeter wave and THz sources. In order to compare performance of...
Diversified Technologies, Inc. (DTI), under contract for BAE Systems, developed a switch tube test set for the realistic testing and conditioning of high power modulator switch tubes employed in radar transmitters. The system may be configured for triode or tetrode tubes and has a nominal plate power rating of 30 kW.
This program is developing high power windows fabricated from single crystal sapphire that provide superior mechanical properties. A key requirement is a robust surface coating to suppress multipactor emission. This program developed an innovative process that chemically bonds titanium nitride to the surface, providing a significant improvement over sputtered coatings.
We present the hot test results of a 220 GHz, serpentine waveguide vacuum electron amplifier showcasing a novel embedded monofilament microfabrication technique based on UV-LIGA. The instantaneous operating bandwidth exceeds 15 GHz and the small signal gain of the circuit is over 14 dB. By varying the voltage slightly, an operating bandwidth of almost 40 GHz is realizable with a minimum circuit gain...
This paper identifies the need of satellite operators for in-orbit flexibility. It also examines the various advantages of flexible dual LCTWTA used onboard communication satellites, as well as the areas that need to be considered by LCTWTA manufacturers for this new technology to remain attractive.
After 15 years, the first spacecraft using direct radiating collector (DRC) TWTs since their widespread introduction have reached the end of their mission life. This paper reviews the trends in DRC TWT thermal performance over that time, using on-orbit temperature measurements from dozens of DRC TWTs. The results yield valuable data about the thermal environment and absolute maximum and minimum temperatures...
L-3 Communications Electron Technologies Inc., (L-3 ETI), has completed space-flight qualification for a 160-W, radiation-cooled, X-band helix traveling-wave tube (TWT). This paper will discuss TWT performance, manufacturing and flight qualification test results.
A new field emitter geometry that utilizes a dielectric shield between the emitter tip and gate has been optimized to eliminate flashover in the cathode emitter cavities and improve cathode reliability. A high average power testbed has been designed and fabricated to test these cathodes at currents and current densities required for TWT operation in the X/Ku-Band frequency regime. Experimental tests...
A five waveguide output structure is proposed in order to improve the microwave power propagation capability for gyro-devices applications. The simulations and experiments were performed for analyzing the transmission characteristics of the structure. The results show the simulations are in good agreement with the experiments, which is beneficial for gyro-devices applications.
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