High-frequency transmission element

A high-frequency transmission element, comprising:

• a connecting wire structure, disposed in a first layer of the high-frequency transmission element, wherein the connecting wire structure comprises:
• a connecting wire;
• and
• a connecting pad, located at an end of the connecting wire;
• a plurality of reference electrode structures, electrically connected to a reference voltage respectively;
• and
• a first impedance matching plate structure, disposed in a second layer of the high-frequency transmission element, wherein the first impedance matching plate structure comprises:
• a first impedance matching plate body;
• a first opening, wherein the connecting pad is located in a projection range of the first opening in a direction of orthographic projection of the first impedance matching plate structure;
• a first impedance matching portion, located in a periphery of the first opening and extending in a direction from the connecting wire to the connecting pad;
• and
• a plurality of protruding structures, located in the periphery of the first opening and respectively surrounding one of the reference electrode structures,
• wherein the protruding structures extend from the periphery of the first opening towards a direction of the connecting pad,
• wherein the first layer and the second layer are separated by a non-zero pitch distance.