ANTENNA UNIT

摘要

PROBLEM TO BE SOLVED: To provide an antenna unit capable of reducing noise transmitted via a ground line from an electronic device and preventing deterioration in reception sensitivity. SOLUTION: The antenna unit to be connected to the electronic device and for transmitting a received radio signal to the electronic device comprises a noise canceller which is to cancel the noises to be generated in the electronic device and to be transmitted to the antenna unit via the ground line. The noise canceller is composed of a stub piece 30 whose one end portion is electrically connected to an electromagnetic shield and the other end portion is a free end, and length of the stub piece is approximately 1/4 wavelength of the radio signal. COPYRIGHT: (C)2005,JPO&NCIPI