Novel miniature structures for passive elements--inductors and capacitors--are proposed to reduce the area they consume in GaAs MMICs. The miniaturized inductors are fabricated out of thick metal micro-wire, 10 μm thick, 6 μm wide, and with 2 μm spacing. The miniaturized capacitors are constructed as a corrugated structure with an insulator layer sandwiched between electrodes on a S.I. GaAs substrate with 3-μm-deep taper holes, in a checkerboard pattern. Both elements are fabricated employing very simple technology as a result of their monolayer structures. Adopting the proposed structures, the elements have been shrunk to 1/4 the size of conventional elements.