Stripline filter and manufacturing method thereof

A method of manufacturing a stripline filter comprising a dielectric substrate having a top surface, a bottom surface, and a side surface connecting the top and bottom surfaces;

• a ground electrode provided on the bottom surface of the dielectric substrate;
• a plurality of resonant lines provided on the top surface of the dielectric substrate;
• side surface lines provided on the side surface of the dielectric substrate and connected to at least the ground electrode;
• and an input/output electrode provided on the bottom surface of the dielectric substrate, spaced from the ground electrode and coupled to any resonators formed by the plurality of resonant lines, wherein at least one of the resonant lines has a substantially L shape and includes a connection electrode part connected to one of the side surface lines at an edge of the top surface of the dielectric substrate and having a width greater than a line width of the side surface line, a first line part extending parallel to the edge of the top surface and connected to the connection electrode part along a first portion thereof and separated from the edge of the top surface along a second portion thereof at an interval, and a second line part that is perpendicularly connected to the first line part and is open at an end thereof, the method comprising:
• dividing a dielectric motherboard into a plurality of dielectric substrates to obtain the dielectric substrate, the dielectric motherboard having the resonant lines formed on the top surface and the ground electrode and the input/output electrode formed on the bottom surface;
• and
• forming the side surface lines by printing a conductive paste on the side surfaces of the dielectric substrate obtained by the division at the division step.