Wireless security device

摘要

A wireless security device includes a nonconductive housing, a mother circuit board, a wireless expansion card, and a metal reflector. The mother circuit board and the wireless expansion card are disposed in the nonconductive housing. The mother circuit board includes a processor. The wireless expansion card includes a dielectric substrate, a ground plane, an inverted-F antenna, and an RF (radio frequency) module. The metal reflector is positioned between the mother circuit board and the wireless expansion card, and is close to the inverted-F antenna. The metal reflector is configured to reduce EMI (Electromagnetic Interference) from the mother circuit board so as to maintain performance of the inverted-F antenna.

主权项

1. A wireless security device, comprising:
a nonconductive housing; a mother circuit board, disposed in the nonconductive housing, and comprising a processor; a wireless expansion card, disposed in the nonconductive housing, and comprising;
a dielectric substrate;a ground plane, disposed on a surface of the dielectric substrate;an inverted-F antenna, disposed on the surface of the dielectric substrate, and coupled to the ground plane; andan RF (Radio Frequency) module, coupled to the inverted-F antenna, and coupled to the processor; and a metal reflector, positioned between the mother circuit board and the wireless expansion card, close to the inverted-F antenna, and configured to reduce EMI (Electromagnetic Interference) from the mother circuit board so as to maintain performance of the inverted-F antenna.