Patent ID: 7439924
Filing Date: 2008-10-21
Classification: H01Q

Abstract:
1. An offset overlapping slot line antenna apparatus comprising: a first conducting region lying in a first plane; a second conducting region lying in a second plane; said first plane and said second plane being parallel, but not coplanar; said first conducting region having a non-overlapping portion relative to said second conducting region as viewed perpendicular to first plane; said second conducting region having a non-overlapping portion relative to said first conducting region as viewed perpendicular to said first plane; said first conducting region having a first slot edge proximal to said second conducting region; said second conducting region having a second slot edge proximal to said first conducting region; said second slot edge spaced from said first slot edge; said first slot edge and said second slot edge forming a slot transmission line between said first conducting region and said second conducting region; said slot transmission line having a characteristic impedance as a function of a distance from said feed region along said slot transmission line; said slot transmission line including at least one section wherein said first conducting region and said second conducting region are non-overlapping; said slot transmission line fed by coupling across said first conducting region and said second conducting region at a feed region and establishing two signal paths from said feed region along said slot transmission line to surrounding free space; said two signal paths being in opposite directions from said feed region; said slot transmission line overlapping in said feed region, yielding an extremum in impedance at said feed region along each of said two signal paths.