Portable radio with coplanar ground and atenna conductive films formed on the inner surface of the case

A portable radio communication apparatus, comprising:

• an antenna,
• an insulating case, and
• a printed board having first and second opposed surfaces and a radio communication circuit including a ground pattern and a feeding point, said printed board disposed in said insulating case, and said insulating case having an inner surface opposed to and separated from one of said first and second opposed surfaces of said printed board to define a space therebetween,
• wherein said antenna is a conductive film coated on first predetermined region of said inner surface of said insulating case;
• a conductive ground film coated on a second region of the inner surface of said insulating case, other than said first predetermined region but coplanar with said first region, said conductive ground film surrounding said antenna conductive film such that a C-shaped slot having a constant width is formed and defined between said antenna conductive film and said conductive ground film;
• a first conductive member connecting said antenna conductive film with said conductive ground film;
• a plurality of second conductive members extending within said space and connecting said conductive ground film with said ground pattern of said radio communication circuit;
• and
• a feeding member extending within said space and connecting said antenna conductive film with said feeding point of said radio communication circuit.