To unitformize and stabilize a high frequency characteristic and to inexpensively manufacture a filter by engaging dielectric parts and magnetic material parts into plural holes provided for a dielectric board and printing and formed conductors on the surface of the dielectric board.
Dielectric parts 2 are engaged into the plural large holes in the board 1 and the magnetic material parts 3 are engaged into the plural small holes. The conductors are printed on the surface of the board 1 and become micro strip lines 4. It is desirable that the dielectric substrate 1 be formed of plastic, especially polytetrafuloroethylene. A reinforcing board for preventing the mechanical distortion of the board 1 is provided at the back of the dielectric board 1. The materials of the magnetic material parts 3 are hard ferrite. Heat is applied to the magnetic material parts 3, and the temperature is once raised higher than the Curie temperature of the materials, thus demagnetizing the ports. Magnetic field is applied from the outside, while the parts are cooled, thus changing a magnetized state.
MYOGA OSAMU
OKADA YOSHITSUGU
