| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a directional coupler which ensures a sufficient electromagnetic coupling degree even with the chip size reduced, and reduces the insertion loss of a main line. <P>SOLUTION: An internal circuit composed of a main line 2, a sub-line 3, and an electromagnetic coupling part 4 is formed on a dielectric board 5 through an insulation layer 6. The coupling part 4 is covered with the insulation layer 6 to form a chip, and outer terminals 8-1, 8-2, 9-1, 9-2 are mounted on the chip. Concretely, the coupling part 4 is formed with a main branch line 40 of a part of the main line 2, and a sub-branch line 41 of a part of the sub-line 3. The main branch line 40 is composed of a line parts 40a, 40b forming a parallel connection structure, and the sub-branch line 41 is composed of a lines 41a, 41b forming a parallel connection structure. The line lengths of the lines 40a, 40b are set to be equal and those of the lines 41a, 41b are set to be equal. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
