ANTENNA CIRCUIT AND ANTENNA SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide an antenna circuit and an antenna system where machine parts of for general purposes can be utilized and with which stable reception is always possible even in the case of intense electric field and a transmission distance is improved by reducing suppression by the interfering wave of a near frequency. SOLUTION: The antenna circuit is provided with a receiving circuit part connected to an antenna 1 for receiving radio waves of a microwave band. The receiving circuit part comprises: a low-noise amplifying circuit 3 which amplifies a received signal; and a bandpass filter 2 which transmits a desired frequency. The bandpass filter 2 is arranged between the antenna 1 and the low-noise amplifying circuit 3, and connected directly to the antenna 1 with a connector C. COPYRIGHT: (C)2005,JPO&NCIPI