Abstract
This letter presents a new solid-state RF source generating kW-level output power at HF band.Four power transistors are driven in a doubly-differential way, operated in a switching mode, and combined together to produce high output power. A multilayered input feed network is carefully designed, such that an accurate doubly-differential signal is provided to the transistors. The output matching and combining circuitry is optimized toward a high efficiency. The implemented RF source produces a CW signal of 1.5 kW at 29 MHz with a drain efficiency of 85%. The measured high efficiency is attributed to the well-balanced and symmetric switching-mode operation of each transistor, which is verified experimentally by a thermal image. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1489–1492, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25230
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