PURPOSE: To reduce the restriction for layout of the internal parts of a radio equipment by supplying the electric power to a resonance conductor plate from a feeding conductor plate through the capacitive coupling.

CONSTITUTION: A resonance conductor plate 2 having its circumferential length equal to about 1/2 working radio wave is placed at the upper part of a ground conductor plate 1. A conductor 4 consists of both plates 1 and 2 connected together and positioned at the edge of the plate 2. A feeding conductor plate 6 having a feeding part 3 is placed almost in parallel to the plate 1 at a place near the edge side 7 of the plate 2 set opposite to the conductor 4. As the voltage is high in a resonance mode at the side 7, the electric field generated between the side 7 and the plate 1 is large and two sides of the side 7 are capacitively coupled to two sides of the plate 6. This coupling value is set by the distance D between both plates 2 and 6 and the distance L between the coupled sides.