FIELD: radioelectronic microwave devices. SUBSTANCE: frequency doubler has transistor provided with input and output matching circuits and open-circuit transmission line section, half-wave on input frequency, connected to output electrode of transistor; in addition, it is provided with transmission line section, half-wave on input frequency, and open-circuit transmission line section, both connected to output electrode of transistor; input impedance of open-circuit transmission line section is found from mathematical dependence given in description of invention. EFFECT: improved design. 2 dwg
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