Transmission line including a multilayer body having a signal conductor layer, ground conductor layers and a hollow portion of varying width

A transmission line, comprising:

• a multilayer body including insulation layers laminated in an up-down direction;
• a signal conductor layer provided in the multilayer body and extending in a front-back direction orthogonal to the up-down direction;
• and
• a first ground conductor layer provided in the multilayer body and provided above the signal conductor layer to overlap the signal conductor layer when viewed in the up-down direction;
• wherein
• a hollow portion is provided in the multilayer body;
• the hollow portion overlaps the first ground conductor layer when viewed in the up-down direction;
• a first orthogonal direction orthogonal to the front-back direction, and a direction orthogonal to the front-back direction and the first orthogonal direction, are defined as a second orthogonal direction;
• when viewed in the first orthogonal direction, the hollow portion includes a first portion positioned in the second orthogonal direction of the signal conductor layer;
• a width of the first portion in the second orthogonal direction has a first portion maximum width value, a first portion minimum width value, and a first portion intermediate width value less than the first portion maximum width value and greater than the first portion minimum width value;
• in the first portion, a portion at which the width of the first portion in the second orthogonal direction has the first portion maximum width value is a first portion maximum width portion;
• in the first portion, a portion at which the width of the first portion in the second orthogonal direction has the first portion minimum width value is a first portion minimum width portion;
• in the first portion, a portion at which the width of the first portion in the second orthogonal direction has the first portion intermediate width value is a first portion intermediate width portion;
• the first portion intermediate width portion is positioned between the first portion maximum width portion and the first portion minimum width portion in the front-back direction;
• the first orthogonal direction is the up-down direction;
• and
• a portion of the first ground conductor layer overlapping the hollow portion in the up-down direction protrudes downward.

A transmission line, comprising:

• a multilayer body including insulation layers laminated in an up-down direction;
• a signal conductor layer provided in the multilayer body and extending in a front-back direction orthogonal to the up-down direction;
• and
• a first ground conductor layer provided in the multilayer body and provided above the signal conductor layer to overlap the signal conductor layer when viewed in the up-down direction;
• wherein
• a hollow portion is provided in the multilayer body;
• the hollow portion overlaps the first ground conductor layer when viewed in the up-down direction;
• a first orthogonal direction orthogonal to the front-back direction, and a direction orthogonal to the front-back direction and the first orthogonal direction, are defined as a second orthogonal direction;
• when viewed in the first orthogonal direction, the hollow portion includes a first portion positioned in the second orthogonal direction of the signal conductor layer;
• a width of the first portion in the second orthogonal direction has a first portion maximum width value, a first portion minimum width value, and a first portion intermediate width value less than the first portion maximum width value and greater than the first portion minimum width value;
• in the first portion, a portion at which the width of the first portion in the second orthogonal direction has the first portion maximum width value is a first portion maximum width portion;
• in the first portion, a portion at which the width of the first portion in the second orthogonal direction has the first portion minimum width value is a first portion minimum width portion;
• in the first portion, a portion at which the width of the first portion in the second orthogonal direction has the first portion intermediate width value is a first portion intermediate width portion;
• the first portion intermediate width portion is positioned between the first portion maximum width portion and the first portion minimum width portion in the front-back direction;
• and
• an entirety of all of the outer edges of the signal conductor layer face the hollow portion in a section orthogonal to the front-back direction.