Dielectric waveguide port coupling structure including a metalized dielectric block having a blind groove with a transmission line disposed therein

A dielectric waveguide port coupling structure comprises:

• a surface-metalized dielectric block having a first surface and a second surface that is opposite to the first surface;
• a blind groove opened in the first surface of the dielectric block, wherein the blind groove comprises a main portion and at least one extension portion each extending from the main portion toward a corresponding frequency blind hole (A1, B1) that is located nearby and opened in the first surface of the dielectric block, the blind groove having metalized walls;
• and
• a coupling through-hole penetrating from a bottom wall of the blind groove to the second surface of the dielectric block, and used for connecting with an input or output device to input or output a signal, wherein the coupling through-hole is metalized,
• wherein,
• at least one transmission line is provided on the bottom wall of the blind groove and extends from the coupling through-hole along a corresponding extension portion,
• a first end-less and non-metalized region is formed in the proximity of a transmission area where the at least one transmission line and the coupling through-hole are disposed, and extends around a periphery of the transmission area, and wherein
• a second end-less and non-metalized region is formed in the second surface of the dielectric block and extends around the coupling through-hole.