| 摘要 |
PROBLEM TO BE SOLVED: To provide a directional coupler which has an excellent directivity even if it is composed of microstrip lines using a high-permittivity dielectric board. SOLUTION: The directional coupler has the dielectric board 1, a first and a second strip conductor patterns 2a and 2b which are formed on one surface of the dielectric board 1, and a ground conductor pattern 3 which is formed on the other surface of the dielectric board 1. A main line 11 is composed of the dielectric board 1, the first strip conductor pattern 2a and the ground conductor pattern 3. A sub line 12 is composed of the dielectric board 1, the second strip conductor pattern 2b and the ground conductor pattern 3. The main line 11 and the sub line 12 are electromagnetically connected. A first stub conductor pattern 4a is provided from the strip conductor pattern 2a toward the strip conductor pattern 2b, and the pattern width at one edge which is connected to the strip conductor pattern 2a of the stub conductor pattern 4a is narrower than that at the other edge near to the strip conductor pattern 2b. COPYRIGHT: (C)2009,JPO&INPIT
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