Patent ID: 7626558

Claim:
A monoconical antenna, comprising: a substantially conical radiation electrode formed in one end face of a dielectric; and a ground conductor provided in proximity to said substantially conical radiation electrode and configured such that electrical signals are fed between a near vertex region of said substantially conical radiation electrode and a region of said ground conductor, wherein a vertex of said substantially conical radiation electrode is not located on a first straight line, which passes through the center of the electrode and is perpendicular to the width of the substantially conical radiation electrode, a cone angle α that is an angle between a second straight line, which passes through the vertex of said substantially conical radiation electrode and is perpendicular to the width of the substantially conical radiation electrode, and a side face of the substantially conical radiation electrode, is determined by a predetermined rule according to a relative dielectric constant ∈ r of the dielectric, and a ratio of a height h of said substantially conical radiation electrode to an effective radius r of a base said substantially conical radiation electrode is determined by a predetermined rule according to a relative dielectric constant ∈ r of said dielectric.