Filter, preparation method thereof, and electronic apparatus

A method for preparing a filter, comprising:

• providing a dielectric substrate, on which at least one capacitor and at least one inductor are formed;
• wherein forming the at least one capacitor and the at least one inductor comprises:
• forming a first conductive pattern on the dielectric substrate, wherein the first conductive pattern comprises at least a first plate of the capacitor;
• forming a second conductive pattern on a side of the first conductive pattern facing away from the dielectric substrate, wherein the second conductive pattern comprises a second plate of the capacitor;
• and at least one of the second plate or the first plate is electrically connected to the inductor;
• and
• forming multiple layers of third conductive patterns on a side of the second conductive pattern facing away from the dielectric substrate, and forming at least one first interlayer insulation layer between adjacent third conductive patterns, wherein the third conductive patterns comprise coil structures of the inductor, and the coil structures of adjacent layers are electrically connected together through a first connection via running through the first interlayer insulation layer between the coil structures;
• and orthographic projections of any two of the multiple layers of coil structures on the dielectric substrate partially overlap each other.