| 摘要 |
A high frequency coupler ( 2 ) comprising first and second coupler patterns ( 11, 12 ) each having an annular shape broken at one location and formed, facing each other, on the front and rear surfaces of a circuit board ( 10 ) consisting of a dielectric and being t thick. The terminals ( 11 a, 11 b) of the first coupler pattern ( 11 ) serve as unbalanced terminals, and the terminals ( 12 a, 12 b) of the second coupler pattern ( 12 ) serve as unbalanced terminals from which coplanar lines ( 41, 42 ) are led out along the rear surface and connected with a balanced antenna ( 5 ). Since the first and second coupler patterns ( 11, 12 ) are kept in an electrostatic capacity coupling state as well as in a magnetic induction coupling state, the coupler high in transmission efficiency in a broad band can be realized.
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