Patent ID: 8860624
Filing Date: 2014-10-14
Classification: H01Q

Abstract:
1. A wireless explosion-proof apparatus in which a communication module configured to transmit and receive a wireless signal through an antenna is disposed inside an explosion-proof chamber, comprising: a connection line disposed in the explosion-proof chamber, the connection line configured to connect one end of a central conductor of a connector portion of the antenna to the communication module; and a short stub module disposed in the explosion-proof chamber and disposed on the connection line, the short stub module configured to secure electric conduction between the one end of the central conductor and a ground so as to keep potential of the central conductor at certain potential, wherein an other end of the central conductor of the connector portion of the antenna is exposed to the outside of the explosion-proof chamber, the short stub module is configured to short circuit the one end of the central conductor and the ground in terms of DC, and the other end of the central conductor of the connector portion of the antenna is a bare live part connectable to ground, wherein the short stub module includes a distributed constant circuit, and wherein the short stub module is formed to correspond to a plurality of bands, the short stub having a first connection line pattern in which a high-frequency signal is inputted from one end and outputted from the other end in a horizontal direction, and a second connection line pattern one end of which is connected to a central portion of a lower side of the first connection line pattern at right angles and the other end of which is DC-connected to the ground through at least one of crank-like patterns connected in series.