MULTI-BAND ROD ANTENNA CONVERTIBLE OF OPERATING FREQUENCY WITH BROADBAND USING COUPLING

摘要

PURPOSE: A multi-band rod antenna is provided to change the band width of operational frequency by adjusting a gap between a metal rod and sleeves which are in combination with the metal rod. CONSTITUTION: A multi-band rod antenna includes a metal rod(130) and an insulator(140). The upper end and the lower end of the metal rod are inserted into the lower side of an upper sleeve(110) and into the upper side of a lower sleeve(120). The metal rod is based on a conductor. The insulator with the pre-set thickness is formed on the outer circumference of the metal rod. The insulator separates the metal rod from each sleeve.