Mobile phone antenna with a radio frequency circuit

摘要

The present invention relates to a mobile phone antenna having a radio frequency circuit unit, the hollow cylindrical antenna housing 100 is blocked at one end; A radio frequency circuit unit 200 including an induction coil 210 and an IC chip 220 wound around one of a circle and a quadrangle receiving a transmission signal transmitted from a separate transmitter; One side end is inserted into one end of the antenna housing is not blocked and the antenna metal portion 300 is formed on the outer circumferential surface of the other one end; And a fastening part 400 formed of a screw thread on an inner surface of the metal material to be fastened to the screw thread of the antenna metal part. Including, the IC chip 220, Filter 221 for filtering only the radio frequency components including the transmission signal of the signal induced by the induction coil (210); A tone detector 222 for detecting a transmission signal among the radio frequency signals filtered by the filter 221; And a controller 223 for transmitting an alarm generation command signal to a controller of a mobile phone when the transmission signal is received below a predetermined level. It includes.;Preferably, the radio frequency circuit unit 200 is fixed to at least one side of the antenna housing 100 and the antenna metal unit 300.