Built-in cross-coupled dielectric filter

A built-in cross-coupled dielectric filter comprising:

• at least three sequentially welded coaxial dielectric resonators;
• mutually coupled capacitors or mutually coupled inductors etched on pairs of opposing lateral surfaces of adjacent coaxial dielectric resonators such that consecutive pairs of opposing lateral surfaces of adjacent coaxial dielectric resonators have mutually coupled inductors and mutually coupled capacitors etched thereon in an alternating manner;
• and
• an input port and an output port of the built-in cross-coupled dielectric filter are positioned at a first coaxial dielectric resonator and a last coaxial dielectric resonator, respectively,
• wherein the mutually coupled capacitors are formed by etching mutually-matched open-loop grooves on the opposing lateral surfaces of the adjacent coaxial dielectric resonators, and the mutually coupled inductors are formed by etching mutually-matched straight-line grooves on the opposing lateral surfaces of the adjacent coaxial dielectric resonators.