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In this paper, variable reflection-type attenuators based on varactor diodes are introduced and described in detail. Their main components are 3-dB couplers, varactor diodes, and lumped elements. Initially, a simple varactor-based reflective load is introduced and its advantages and disadvantages in the circuit of reflection-type attenuators are discussed.(More)
The conventional Doherty power amplifier (DPA) theory is limited to single carrier operations, leading to a nongeneric structure. This paper presents a new analysis that generalizes the conventional DPA (CDPA) theory for increased efficiency and bandwidth. We demonstrate that by introducing a theoretical parameter <inline-formula> <tex-math(More)
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