Dual band antenna for vehicles
AssigneeThe Ohio State University
InventorEric K. Walton
Life of this patent
Estimating the term…
Abstract
A dual band slot antenna for cellular telephone and GPS frequency bands. The antenna is a slot antenna formed in a conductive layer laminated to a layer of a windshield or other transparency. The slot is formed along two adjoining arcs of a circle extending oppositely from a feedpoint, with a portion of the conductive layer interposed between the ends of the slots. The two slot legs have different lengths so the slot is tuned to exhibit at least two resonant peaks, such as one at the cellular telephone frequency band and the other at the GPS frequency band. The slot is fed by strip line transmission lines or capacitive coupling, using additional conductive film patches spaced by one or more layers of the window, with the window layer forming a dielectric.
Claims19
A dual band slot antenna comprising:
- an electrically conductive layer bonded to a nonconductive panel and formed with a slot which forms the slot antenna having two slot legs extending in mutually transverse directions along nonperpendicular paths from a feed point, at which the legs join, to opposite slot leg ends, the slot legs having different lengths to provide resonance of the slot at two different frequency bands with substantially circular polarization at a higher frequency band and substantially vertical polarization at a lower frequency band.
A dual band slot antenna comprising:
- an electrically conductive sheet formed with a slot having two slot legs extending in mutually transverse directions from a feed point, at which the legs join, to opposite slot leg ends, the slot legs having different lengths to provide resonance of the slot at two different frequency bands with substantially circular polarization at a higher frequency band and substantially vertical polarization at a lower frequency band.
Dependencies are inferred from the claim text.