| 摘要 |
The antenna duplexer comprises a first surface acoustic wave (SAW) filter (21) for local oscillation frequency, a second filter (22) for reception frequency which is coupled with said local filter (21) and has the coupled side thereof partly constituted by a second SAW filter (5), a third filter (3) for transmission frequency coupled with said second filter (22), and an antenna (11) coupled between said second and third filter (22 and 3, resp.). This antenna duplexer with a SAW filter (8) is very compact and shows satisfactory electrical characteristics without requiring any additional circuits. |
