| 摘要 |
<p>PURPOSE:To form a high frequency coil with extremely thin electromagnetic shielding function by utilizing a multilayer circuit substrate by forming a solenoid type coil having a rectangular section in the substrate, forming the conductors of the shielding layer in a mesh state to dispose electromagnetic shielding conductors near the coil. CONSTITUTION:Since a main magnetic flux generated by a current flowing to a thin solenoid type coil is enclosed in an insulating layer between a second conductor layer 1B and a third conductor layer 1C and an insulating layer portion near the layer by forming the coil in a multilayer circuit substrate, the coil is hardly affected strongly by the influence even if an electromagnetic shielding conductor layer is disposed near the coil. A parasitic capacity between coils is reduced without weakening a shielding effect by forming the shielding conductor layer in a meshlike state to prevent the self-resonance frequency of the coil from decreasing, thereby obtaining a high frequency coil treated with a thin electronic shield.</p> |
