(under subclass 700) Subject matter including a conducting surface, such as a metallic sheet which may be flat or curved, and an aperture in the surface, which may be completely surrounded by the surface or extended inwardly from an edge of the surface, together with coupling means
which establishes a potential difference at spaced points along the aperture or extracts received energy from these points, these points usually being across the aperture, the surface furnishing a conductive path between these spaced points to permit current to flow therebetween.
(1) Note. In the event the gap completely separates the surface into two parts with the spaced points being across the gap, an electrical short circuit must be provided across the gap as by a galvanic connection or a resonant short circuiting line.
(2) Note. The slot is usually resonant (e.g., a half wave length long, or a perimeter of one wave length) to present a high slot impedance across the coupling thereto.
(3) Note. Antennas having an aperture in a conductive surface, wherein the aperture is used merely for coupling the energy to an antenna are not classified here but in the appropriate subclass below, for example, subclasses 772+ for wave guide type antennas.
SEE OR SEARCH THIS CLASS, SUBCLASS:
741+, for high frequency loops, wherein the loop may be formed of a conductive sheet having a slot-like space between the adjacent ends. 772+, for wave guide type antennas. See (3) Note, above.
789, for antennas within a conductive apertured wall.
SEE OR SEARCH CLASS
333, Wave Transmission Lines and Networks, particularly
208+, 239+ and 248+ for resonant slots in wave guides.
