Capacitive touch keypad with antenna surrounding keypad

A printed circuit board assembly for an access control device, comprising:

• a printed circuit board;
• a controller connected to the printed circuit board;
• a capacitive touch keypad matrix on the printed circuit board in communication with the controller, wherein the capacitive touch keypad matrix includes a plurality of touch-sensitive key locations electrically connected to the controller with a plurality of first lines and a plurality of second lines, wherein each first line is a transmit line and each second line is a receive line, and wherein the controller is configured to transmit signals via the transmit lines, to receive the signals via the receive lines, and to determine key touches based upon the received signals;
• and
• an antenna around the capacitive touch keypad matrix in communication with the controller, the antenna being configured to facilitate transmission of an access code to the controller, wherein:
• the plurality of touch-sensitive key locations includes a first key location and a second key location;
• the first key location is located in a first column and a first row, and the second key location is located in the first column and a second row;
• at least one of the plurality of first lines connects the first column with the controller;
• at least one of the plurality of second lines connects the first row with the controller;
• and
• at least one other of the plurality of second lines connects the second row with the controller;
• wherein the at least one first line comprises:
• a first line first branch connected between the controller and the first key location;
• a first line second branch connected between the controller and the second key location, and wherein the first line first branch and the first line second branch are in electrical parallel with one another;
• and
• a first line third branch connected between the controller and a junction;
• wherein the first line first branch is connected between the first key location and the junction;
• and
• wherein the first line second branch is connected between the second key location and the junction.

A printed circuit board assembly, comprising:

• a printed circuit board;
• a capacitive touch keypad matrix on the printed circuit board, wherein the capacitive touch keyboard matrix includes a plurality of key locations arranged in columns and rows;
• an antenna on the printed circuit board coplanar with and circumferentially surrounding the capacitive touch keypad matrix;
• and
• a controller connected with each of the capacitive touch keypad matrix and the antenna such that the controller is operable to receive access codes via each of the capacitive touch keypad matrix and the antenna, wherein at least a portion of the key locations in at least one of the columns is connected to the controller in electrical parallel with another portion of the key locations in the same column, and wherein at least a portion of the key locations in at least one of the rows is connected to the controller in electrical parallel with another portion of the key locations in the same row.

A printed circuit board assembly, comprising:

• a printed circuit board;
• a capacitive touch keypad matrix on the printed circuit board;
• an antenna on the printed circuit board coplanar with and circumferentially surrounding the capacitive touch keypad matrix;
• and
• a controller connected with each of the capacitive touch keypad matrix and the antenna such that the controller is operable to receive access codes via each of the capacitive touch keypad matrix and the antenna;
• wherein the capacitive touch keypad matrix includes:
• a first key location and a second key location;
• a first line, comprising:
• a first branch connected between a junction and the first key location;
• a second branch connected between the junction and the second key location;
• and
• a third branch connected between the junction and the controller;
• a second line connected between the first key location and the controller;
• and
• a third line connected between the second key location and the controller, and wherein the first branch, the third branch, and the second line form a first loop that is in electrical parallel with a second loop formed by the second branch, the third branch, and the third line.