| 摘要 |
<p>PURPOSE:To improve the electromagnetic coupling between coils by a method wherein a part of an approximately ring-shaped hollow conductor is cut, the aperture end parts thereof are opposed, a pair of terminals are provided here resulting in the secondary coil, the primary coil is wound up by fixed turns into this hollow conductor, a pair of terminals are led out by utilizing the aperture end parts, and accordingly an air-core transformer is formed. CONSTITUTION:The hollow conductor of an aluminum tube or a copper tube, etc. is bent approximately to a ring shape, the both aperture end parts thereof are opposed resulting in the secondary coil 6, terminals 6A and 6B are mounted respectively to the both aperture end parts, and a load resistance 20 is connected therebetween. Next, the primary coil 5 which is formed by fixed turns and electrically insulated is inserted into the hollow conductor constituting the secondary coil 6, both end parts thereof are led out by utilizing the both aperture end parts which are opposed, and terminals 5A and 5B are connected here. Constituting an air-core transformer in this manner, the electromagnetic coupling of the primary and secondary coils becomes close, and therefore high frequency output can be effectively led out even in less turns of coil windings.</p> |
