ANTENNA SYSTEM FOR PROXIMITY CONTROL
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Abstract
COVERS TO PLUMBING AND OTHER SYSTEMS WHICH RESPOND, FOR EXAMPLE, TO THE APPROACH OR WITHDRAWAL OF A USER. THE ARRANGEMENT INCLUDES A PRIMARY ANTENNA STRUCTURE WHICH CHANGES IN ELECTRICAL CAPACITANCE IN RESPONSE TO THE APPROACH OR WITHDRAWAL OF THE USER, A CONTROL CIRCUIT CONNECTED TO THE ANTENNA STRUCTURE, AND A TRANSLATING DEVICE, SUCH AS A VALVE WHICH IS TO BE OPERATED OR RELEASED. THE ARRANGEMENT INCLUDES A SECONDARY ANTENNA TO RENDER THE PRIMARY ANTENNA STRUCTURE MORE SENSITIVE. A COAXIAL CABLE SYSTEM INTERCONNECTS THE PRIMARY ANTENNA STRUCTURE TO THE
CONTROL CIRCUIT. WHEN THE ARRANGEMENT IS APPLIED TO A PLUMBING FIXTURE, A GROUNDED SHIELD IS APPLIED TO THE PLUMBING FIXTURE.
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