| 摘要 |
PURPOSE: A radiation diversity antenna is provided to allow the antenna to operate in a wide variety of modes through a tree structure. CONSTITUTION: A radiation diversity antenna comprises radiating elements(1,2,3,4,5) constituted by tree type arms. Each of the arms has a length of kλs/2, wherein k is the same or different integers from one arm to the subsequent arm, and λs is the wavelength derived from a slot line constituting the arm. At least one of the arms includes switching elements disposed on the slot line constituting the arm so as to control the coupling between the arm and a supply line(6) by a function of command. Each of the arms includes a switching unit including a diode and a transistor.
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