Integrated 220 GHz Source Development
Final rept. 21 Jul 2008-31 Dec 2013
NORTHROP GRUMMAN CORP BALTIMORE MD
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This report summarizes the technical progress made at NGES during the HiFIVE program developing a 50 W, 220 GHz amplifier based on vacuum electronics technology. Two configurations were investigated A multi-beam amplifier in a planar magnet and a single-beam device in a cylindrical magnet with radial access. Precision micro-fabrication techniques were used to achieve the stringent specifications for the folded waveguide circuit dimensions and tolerances. We demonstrated high power and good transmission with a five-beam configuration during 2012. Peak output powers up to 31 W were measured at 219 GHz. Even higher powers 55 W were produced at 214 GHz because of the higher gain at lower frequencies. A power-bandwidth of 247 W-GHz was measured at 214 GHz, and the overall gain was 28.5 dB. We also achieved a beam transmission efficiency of 75 through the RF circuit to the collector. The multi-beam amplifier is relatively complex, and typically results in a larger and heavier device. We also investigated an alternate concept based a compact single-beam 220 GHz amplifier as part of the HiFIVE program. A prototype was fabricated in 2013, and RF testing resulted in powers up to 19.4 W at 212 GHz with a beam transmission efficiency of 99.5.
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