Multi-layered resonator circuit structure and multi-layered filter circuit structure

A multi-layered resonator circuit structure, comprising:

• a multi-layered substrate having a top surface, a bottom surface, and a ground layer, wherein the top surface and the bottom surface face away from each other, and the ground layer is located between the top surface and the bottom surface;
• a plurality of resonators, a part of the plurality of resonators disposed on the top surface, and another part of the plurality of resonators disposed on the bottom surface;
• and
• a plurality of conductive components located in the multi-layered substrate and wherein the plurality of resonators is electrically connected to the ground layer, respectively, via the plurality of conductive components;
• wherein each of the plurality of resonators includes a joint and a plurality of stubs, the plurality of stubs are connected to the joint, the plurality of stubs are one ground stub and at least one open stub, and the plurality of ground stubs are electrically connected to the ground layer, respectively, via the plurality of conductive components;
• wherein the at least one open stub comprises a plurality of open stubs;
• wherein the plurality of open stubs protrude from the ground stub along different directions.