PURPOSE: To eliminate the impedance mismatching by providing a fixed member comprising a cylindrical grounding conductor and a metallic member penetrated from a side opposite to the dielectric fixed to one surface of the grounding conductor so as to conduct electrically the grounding conductor and the fixed member even if a gap is produced.
CONSTITUTION: A microstrip line antenna 21 is equipped with a plate dielectric 22 made of a synthetic resin material such as 'Teflon(R)', a microstrip line 23 is formed on one surface of the dielectric 22 and a protection film 24 is formed to the remaining region. A grounding conductor 25 made of a material such as aluminum is fixed to the other surface of the dielectric 22 and a through hole 26 of an inner diameter D1 is formed and a through hole 27 having an inner diameter D2 larger than the inner diameter D1 coaxial to the through hole 26 is formed to the grounding conductor 25. A fixed member 28 having an inner diameter D3 being an intermediate value between the diameters D1 and D2 and made of a metallic material such as stainless steel is fitted to the through hole 27.
TANIGUCHI SHUJI
NAKAMURA KAZUO
KONDO SADAAKI
MATSUI EITARO
KANDA MINORU
Next Patent: METHOD FOR MODIFYING AND COATING SURFACE OF MOLDED PLYOLEFIN RESIN ARTICLE