Patent ID: 7595767

Claim:
An antenna, comprising: a grounded plate; a plate-shape radiating conductor, positioned parallel to said grounded plate; a feed line conductor, one end of which is connected to a feed point of said plate-shape radiating conductor, the other end of which is connected, as an antenna terminal, to an inner conductor of a coaxial cable, and which is perpendicular to said plate-shape radiating conductor; and a conductor disc, electrically connected to said feed line conductor, and positioned parallel to said ground plate, wherein the distance from said conductor disc to said grounded plate can be adjusted, and wherein screw threads are formed on the outer periphery of at least a portion of said feed line conductor, said conductor disc has a center portion penetrated by said feed line conductor, thread grooves which mate with said screw threads of said feed line conductor are formed on the inner surface of said center portion, and by rotating said conductor disc, the distance from said grounding plate can be adjusted along said screw threads.