| 摘要 |
PROBLEM TO BE SOLVED: To provide a small-sized antenna capable of maintaining a high reception performance even when a radio wave of an undesirable signal is strong. SOLUTION: A thin plate band pass filter (interdigital filter) 10 provided with microstrip lines 12a to 12e or the like is interposed between an LNA board 1 for a low noise amplifier circuit and a dielectric antenna 2 supported on the LNA board 1, and a signal received by the dielectric antenna 2 is supplied to the low noise amplifier circuit after passing through the band pass filter 10. Thus, the low noise amplifier circuit selectively amplifies only the desired reception signal and outputs the amplified signal to a post-stage reception circuit and it is not required to add a new mount space to the LNA board 1 to avoid upsizing of the antenna. COPYRIGHT: (C)2003,JPO
|
