Compound element for image element antennas

摘要

Image element antennas are well known for their relatively small size and highly directive radiation patterns. Such antennas, however, have an inherent disability in that the mechanism responsible for high directivity is inoperable at a certain angle, thereby producing a sidelobe into which relatively large amounts of power are radiated. The present invention involves an improved element for use in image element antennas which avoids radiating any substantial amounts of power into this sidelobe. A preferred embodiment of the invention provides a doublet element having a minimum of radiated power at the angle of the sidelobe, thus avoiding the need for the multiple reflection-transmission mechanism which fails at this angle.