| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an antenna electrostatic protection circuit in which elimination capability is enhanced for the band frequency of electrostatic surge, a passage loss is increased for the frequency which is 3n times the frequency of a fundamental wave which a radio circuit transmits or receives, and, the passage loss is reduced for the frequency of the fundamental wave which the radio circuit transmits or receives. <P>SOLUTION: The antenna electrostatic protection circuit 1 includes a transfer line 13 whose one end is connected to a radio circuit 2 and whose the other end is connected to an antenna 3, an open stub 15 which branches from the transfer line 13 and has a length equal to 1/12 of the wavelength of the fundamental wave which the radio circuit 2 transmits or receives, and a short stub 16 which branches from the transfer line 13 at the same point as that where the open stub 15 branches from the transfer line 13, and has a length equal to 1/6 of the wavelength of the fundamental wave which the radio circuit 2 transmits or receives. <P>COPYRIGHT: (C)2012,JPO&INPIT |
