| 摘要 |
<p>A duplexer (5) is provided with a printed board (10), and a filter circuit (20). The printed board (10) is configured of a dielectric material layer (11) and a ground layer (12), which are laminated to each other. The filter circuit (20) is formed of a conductive material on the dielectric material layer (11) surface on the reverse side of the surface in contact with the ground layer (12). The filter circuit (20) is provided with a receiving filter (21) and a transmitting filter. Each of the receiving filter (21) and the transmitting filter is configured by alternately connecting, in the signal transmitting direction, wide striplines (23) and narrow striplines (24) having a width smaller than that of the wide striplines (23). The receiving filter (21) has holes (30) formed therein, said holes extending in the thickness direction of the printed board (10). The holes (30) penetrate the wide striplines (23) of the receiving filter (21), and reach the inside of the dielectric material layer (11).</p> |
