Flat cavity-backed wire-fed slot antenna with frequency-selective feeder circuit for matching the antenna at two resonance frequencies

摘要

An antenna (10) is provided having a relatively simple structure as arranged capable of operating at 2 desired frequencies.;An antenna (10) comprises: a chassis consisting mainly of a grounding conductor (11) provided as a bottom surface, a ceiling conductor (15) provided as a top surface opposite to the grounding conductor, and side conductors (14) provided as antenna sides; at least one opening (16,17) provided in a part of said chassis, which opens for radiation of electric waves; a feeding point (12) provided on said grounding conductor for power supply via a predetermined feeding line from the outside; and a conductive wire as an antenna element (13) connected to said feeding point at one end while being connected to said ceiling conductor via a frequency selectable circuit (19) at the other end (18), and surrounded by the side conductors (14).