BROADBAND SHORTENED ANTENNA ELEMENT AND ANTENNA USING THE SAME

摘要

PURPOSE: A broadband shortened antenna element and antenna using the same is provided to reduce weight and size of the antenna element, while preventing deterioration of antenna efficiency at the grounding surface. CONSTITUTION: A broadband shortened antenna element comprises a top-shaped member(201) formed of a conductor, and which has a lower end disposed at a feeder(204) of a co-axial connector arranged at a grounding surface(205); a central member(202) arranged upright onto the top-shaped member, and which has a diameter smaller than the diameter of the top-shaped member and is formed of a conductor; an end cap member(203) arranged at the top of the central member and formed of a conductor having a diameter larger than the diameter of the central member. The end cap member forms a resonance frequency at the state where the electrical length of the end cap member is short.