Abstract: A wireless communication device includes a PCB, a grounded electrostatic protection element and an antenna. The PCB includes a ground and an antenna clearance portion. The ground portion includes a ground layer. The antenna clearance portion overlaps the antenna and includes a plurality of second key contacts, a plurality of ground contacts and a plurality of microstrips. The second key contacts are placed on a top surface of the PCB. The ground contacts and the microstrips are placed on a bottom surface of the PCB and corresponding to the second key contacts. The plurality of microstrips connect the plurality of ground contacts to the ground layer. The electrostatic protection element connects the second key contacts to protect them from electrostatic interference.

Abstract: A wireless communication device includes a PCB, a grounded electrostatic protection element and an antenna. The PCB includes a ground and an antenna clearance portion. The ground portion includes a ground layer. The antenna clearance portion overlaps the antenna and includes a plurality of second key contacts, a plurality of ground contacts and a plurality of microstrips. The second key contacts are placed on a top surface of the PCB. The ground contacts and the microstrips are placed on a bottom surface of the PCB and corresponding to the second key contacts. The plurality of microstrips connect the plurality of ground contacts to the ground layer. The electrostatic protection element connects the second key contacts to protect them from electrostatic interference.

Abstract: A network interface for home networking implemented upon an existing 4-wire (two-pair) phone line system is disclosed. The interface comprises two transmitters, two line isolators and a receiver. The two transmitters transmit data simultaneously to both of the pairs of wires in the phone line system so that all devices coupled to the phone line system, regardless which pair of wires being coupled onto, can receive the data. Because all the pairs carry the data, there is therefore needed one on receiver in the interface to receive the data transmitting over the phone line system. The disclosed interface provides a solution to the home networking which no longer requires the knowledge of the underlying wiring structure in the phone line system.

Abstract: A network interface for home networking implemented upon an existing 4-wire (two-pair) phone line system is disclosed. The interface comprises two transmitters, two line isolators and a receiver. The two transmitters transmit data simultaneously to both of the pairs of wires in the phone line system so that all devices coupled to the phone line system, regardless which pair of wires being coupled onto, can receive the data. Because all the pairs carry the data, there is therefore needed one on receiver in the interface to receive the data transmitting over the phone line system. The disclosed interface provides a solution to the home networking which no longer requires the knowledge of the underlying wiring structure in the phone line system.