Antenna and wireless deadbolt sensor
View Patent ↗An antenna for reception and transmission of signals within an enclosure. The antenna includes a first lead for connection to a printed circuit board and a second lead. A plurality of vertical members extend in parallel to one another and spaced a predetermined distance apart. Each vertical member has a first end and a second end. A plurality of horizontal members is provided. Each horizontal member extends alternately between first ends of a pair of adjacent vertical members and second ends of a next pair of adjacent vertical members forming a connection between said first lead and said second lead.
1. A deadbolt sensor assembly configured to enable mounting the assembly in a cavity formed in a frame of a door, wherein the assembly comprises:
a sensor to sense a deadbolt position to generate an output signal indicating when said deadbolt position is in said cavity in a lock position and when said deadbolt position is outside said cavity in an unlock position;
a wireless transmitter responsive to said sensor output signal to transmit a wireless signal containing information derived from said output signal;
a printed circuit board to which the sensor is connected;
an antenna electrically coupled to said wireless transmitter and to a circuit mounted on said printed circuit board to transmit the wireless signal containing information derived from said sensor output signal, said antenna including:
a first lead for connection to said wireless transmitter;
a second lead;
a plurality of vertical members extending in parallel to one another and spaced a predetermined distance apart, each vertical member having a first end and a second end;
a plurality of horizontal members, each horizontal member extending alternately between first ends of a pair of adjacent vertical members and second ends of a next pair of adjacent vertical members forming a connection between said first lead and said second lead; and
a substrate on which said first lead, said second lead, said plurality of vertical members, and said plurality of horizontal members are etched to form a square wave pattern, wherein said substrate being connected to said printed circuit board for spacing the antenna from the printed circuit board, and wherein said substrate comprises a flexible material bent to conform to a shape of said printed circuit board to enable said deadbolt sensor assembly to fit within said cavity;
wherein the assembly further comprises a battery for energizing said wireless transmitter and said sensor, and
wherein the antenna transmits signals from and receives signals for a device positioned within the cavity.
2. The deadbolt sensor assembly according to claim 1 , wherein the antenna is formed as one of a monopole and dipole antenna.
3. The deadbolt sensor assembly according to claim 2 , further comprising a housing for retaining the antenna, substrate and printed circuit board.
4. The deadbolt sensor assembly according to claim 3 , wherein said plurality of vertical members and said plurality of horizontal members extend at an angle of 90° from each other.
5. The deadbolt sensor assembly according to claim 4 , wherein a total path length of the antenna is one half a transmit and receive wavelength.
6. A deadbolt sensor assembly configured to enable mounting the assembly in a cavity formed in a frame of a door, wherein the assembly comprises:
a sensor to sense a deadbolt position and generate an output signal indicating when said deadbolt position is in said cavity in a lock position and when said deadbolt position is outside said cavity in an unlock position;
a wireless transmitter responsive to said sensor output signal to transmit a wireless signal containing information derived from said sensor output signal;
a surface to mount thereon said wireless transmitter;
a substrate extending from and being inclined to said mounting surface, said substrate being flexible and bent for surrounding a first portion of a periphery of said mounting surface;
a conductor having a meandering oscillatory shape formed on said substrate, said conductor having a length greater than a length of a second portion of the periphery by a magnitude, said magnitude being dependent upon a height and width of folds forming the meandering oscillatory shape, said conductor being coupled to said wireless transmitter to form an antenna;
wherein the conductor is etched on the substrate, and wherein the assembly further comprises
a printed circuit board to which the sensor is connected, said substrate being connected to said printed circuit board for spacing the conductor from the printed circuit board, and
a battery for energizing said wireless transmitter and said sensor.
7. The deadbolt sensor assembly according to claim 6 , wherein said meandering oscillatory shape of the conductor forms a square wave pattern.
8. The deadbolt sensor assembly according to claim 7 , wherein the conductor transmits signals from and receives signals for a device positioned within the cavity.
9. The deadbolt sensor assembly according to claim 8 , wherein the conductor is formed as one of a monopole antenna and dipole antenna.
10. The deadbolt sensor assembly according to claim 9 , wherein a total path length of the conductor is one half a transmit and receive wavelength.