Reconfigurable monopole antenna for wireless communications

摘要

A reconfigurable monopole antenna is described which includes a radiator element coupled to a feed point through at least two different current paths. The current paths are of different lengths to accommodate different frequency bands. To change the current paths, a feed-point switch is positioned at the antenna feed point for selectively supplying current along either a first current path or a second current path. The current paths share a majority of the radiator element so that separate radiator elements need not be used.

主权项

1. A multiband monopole antenna, comprising:
a radiator element coupled to a feed point through at least two different current paths, the first current path being longer than the second current path to accommodate different frequency bands; a ground plane; a parasitic radiator coupled to the radiator element; a ground-plane switch coupled between a ground plane and the parasitic radiator for selectably disconnecting the ground plane from the parasitic radiator; and a feed-point switch positioned at the feed point coupled between the radiator element and the feed point for selectively supplying current along the first current path or the second current path; wherein a majority of the radiator element is shared by the first and second current paths.