| 摘要 |
<p>PURPOSE:To cope with the change of a carrier frequency and also to attain the matching adjustment of a resonance frequency even after the circuit parts are mounted on a substrate by forming previously plural adjustment patterns and then cutting these patterns except one. CONSTITUTION:A coil 11 contains a spiral main coil 12. A 1st adjustment pattern 13 is formed on a substrate to secure the connection between a part D of a single turn when viewed from an end part A of the voil 12 and the other end B of the coil 12. At the same time, the 2nd and 3rd adjustment patterns 14 and 15 are formed on the back side of the substrate to secure the connection between the end B and the parts E and F of two and three turns when viewed from the end A. These patterns 13-15 are cut except one by the cut lines L1, L2 or L3. Thus the substantial number of turns of the coil 11 can be selected at 1 to 3 times. As a result, the inductance of the coil 11 can be adjusted.</p> |
