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AssigneeThe United States of America as represented by the Administrator of the National Aeronautics and Space Administration
InventorJohn Huang
Estimating the term…
A directional microstrip antenna includes a driven patch surrounded by an isolated reflector and one or more coplanar directors, all separated from a groundplane on the order of 0.1 wavelength or less to provide endfire beam directivity without requiring power dividers or phase shifters. The antenna may be driven at a feed point a distance from the center of the driven patch in accordance with conventional microstrip antenna design practices for H-plane coupled or horizontally polarized signals. The feed point for E-plane coupled or vertically polarized signals is at a greater distance from the center than the first distance. This feed point is also used for one of the feed signals for circularly polarized signals. The phase shift between signals applied to feed points for circularly polarized signals must be greater than the conventionally required 90.degree. and depends upon the antenna configuration.
A directional microstrip array antenna comprising:
A method of tilting the beam of a microstrip array antenna toward an axis of the array, comprising the steps of:
Dependencies are inferred from the claim text.