END-FED PLANAR TYPE SPIRAL ANTENNA

PROBLEM TO BE SOLVED: To provide an end-fed planar type spiral antenna which ensures less limitation in height and improves broadband characteristics and radiation efficiency. SOLUTION: The present invention relates to an end-fed planar type spiral antenna for transmitting/receiving radio signals, including: a spiral pattern formed to have inner and outer spiral curves turned predetermined times in a spiral shape from an arbitrary center point in a plane; a central circle pattern formed in a part of a central region of the spiral pattern in a circular shape; and a feed arm pattern formed in a rectangular shape from an end of the spiral pattern that turns predetermined times. A pattern where the spiral pattern, the central circle pattern and the feed arm pattern overlap, is patterned with a conductive material. Thus, broadband characteristics is improved and radiation efficiency is effectively enhanced by utilizing a tapered spiral structure. Also, this antenna ensures less limitation in height, and allows reduction in size. COPYRIGHT: (C)2010,JPO&INPIT