Patent ID: 7180718

Claim:
A structure comprising: a first electrode; a second electrode; a shielding electrode; wherein at least one plate of said shielding electrode separates each plate of said first electrode from any plate of said second electrode; at least two plates of said shielding electrode sandwich between them all plates of said first electrode and said second electrode; and wherein said first electrode includes a first electrode plate having a first electrode plate major surface and at least one first electrode plate energy entry region, said second electrode includes a second electrode plate having at least one second electrode plate energy entry region; an energy pathway line segment is defined by a line segment terminating in regions defined by a projection onto a plane parallel to a plane defined by said first electrode plate major surface of (1) said at least one first electrode plate energy entry region and (2) said at least one second electrode plate energy entry region; said energy pathway line segment having an energy pathway line segment length; a maximal energy perpendicular line segment corresponding to said energy pathway line segment, said maximal energy perpendicular line segment having a maximal energy perpendicular line segment length; wherein said maximal energy perpendicular line segment length is greater than said energy pathway line segment length.