Capacitive touch keypad

Abstract

An exemplary an access control device generally includes a keypad assembly, an antenna, and a controller. The keypad assembly includes a capacitive touch keypad matrix, and the antenna is substantially coplanar with the capacitive touch keypad matrix. The controller is connected with each of the keypad assembly and the antenna such that the controller is operable to receive access codes via each of the keypad assembly and the antenna. The capacitive touch keypad matrix includes multiple key locations that connect to the controller through separate branches of a common column line and through separate controller lines, so as to form signal transmission loops with the controller.

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