Electrically conductive grounding structure for a multi-band antenna

A multiband antenna, the multiband antenna comprising:

• at least one low band radiating element, which may be an interspersed low band radiating element;
• at least one high band radiating element;
• and
• at least one electrically conductive grounding structure for the at least one high band radiating element of the multiband antenna, the at least one grounding structure comprising:
• a main body portion;
• and
• at least one ground line, the ground line extending from the main body portion from a foot end in a first direction towards a head end;
• wherein the foot end is provided at the main body portion, and wherein the head end is opposed to the respective foot end and is adapted to support the at least one high band radiating element;
• wherein the main body portion further comprises at least one ground contact, the ground contact assigned to and electrically connected with the at least one ground line;
• wherein the at least one ground contact is provided in a distance from the foot end of the assigned ground line;
• wherein the distance is measured in a second direction being different than the first direction, and wherein the distance is chosen so as to shift the common mode (CM) resonance of the at least one high band radiating element out of a used frequency range of a low-band radiating element of the multiband antenna;
• and
• wherein the at least one ground line of the electrically conductive grounding structure is assigned to the at least one high band radiating element.

A base station for mobile communication, the base station comprising:

• at least one multiband antenna comprising:
• at least one low band radiating element, which may be an interspersed low band radiating element:
• at least one high band radiating element;
• and
• at least one electrically conductive grounding structure for the at least one high band radiating element of the multiband antenna, the at least one grounding structure comprising:
• a main body portion;
• and
• at least one ground line, the ground line extending from the main body portion from a foot end in a first direction towards a head end;
• wherein the foot end is provided at the main body portion, and wherein the head end is opposed to the respective foot end and is adapted to support the at least one big band radiating element;
• wherein the main body portion further comprises at least one ground contact, the ground contact assigned to and electrically connected with the at least one ground line:
• wherein the at least one ground contact is provided in a distance from the foot end of the assigned ground line:
• wherein the distance is measured in a second direction being different than the first direction, and wherein the distance is chosen so as to shift the common mode (CM) resonance of the at least one high band radiating element out of a used frequency range of a low-band radiating element of the multiband antenna:
• and
• wherein the at least one ground line of the electrically conductive grounding structure is assigned to the at least one high band radiating element;
• and
• at least one radio unit being assigned to the multiband antenna.