Antenna structure of mobile communication device and mobile communication device having the same antenna structure

摘要

An antenna 10 a equipped on a mobile communication device 1 includes a helical antenna 12 protruding from a casing 2 (key side casing portion 4 ) of the mobile communication device 1 and a cap 13 covering a surface of the helical antenna 12 and is constructed such that degradation of antenna gain of the helical antenna 12 due to contact of a finger 100 with the helical antenna is prevented by increasing a distance between an outer peripheral surface of the cap 13 and a surface of the helical antenna 12 to at least 1.00 mm by increasing a wall thickness of the cap 13.