To provide an integral coil which can have a small coupling efficiency, have the large Q value of a coil L1 in the vicinity of 80 MHz, and have a large inductance of a coil L2.
A drum core 2 made of a magnetic material is mounted on the base 1 of an insulator made of resin or the like, a coil L1 is wound in a winding groove provided in the side surface of the top of the base 1, and a coil L2 is wound in a winging groove divided by upper and lower flanges 21, 22 of the drum core 2. The drum core 2 is connected to the base 1 by fitting a projection (a) provided on the bottom surface of the core into a recess in the top surface of the base 1, and then fixing them using an adhesive or the like. Five terminal pins T1 to T5 including pins not used are inserted into the bottom surface of the base 1, and case legs 41 are mounted on the side surface of a case 4 so as to depend from the case. The drum core 2 is covered with the pot core 3 of a magnetic material to magnetically shield the outer periphery of the coil L2 wound around the drum core 2. An entire arrangement including the base 1, the drum core 2 and the pot core 3 is accommodated in the case 4 of a conductive material to electrostatically shield the coils L1, L2.
OSHIRO MASARU
Maki Reiko
Kimio Kikutani