Antenna device

An antenna device comprising:

• a ground conductor plate;
• and
• an antenna element,
• wherein the antenna element includes:
• a first vertical portion and a second vertical portion which are erected substantially perpendicularly from the ground conductor plate, and
• a connecting portion which includes a portion extending substantially parallel to the ground conductor plate and which connects one end of the first vertical portion and one end of the second vertical portion to each other,
• wherein the other end of the first vertical portion serves as a feeding point and is located at a position that is distant from an outer periphery of the ground conductor plate to a center side of the ground conductor plate,
• wherein the other end of the second vertical portion is grounded,
• wherein the connecting portion includes an along-edge portion which extends along the outer periphery of the ground conductor plate when viewed from a direction perpendicular to the ground conductor plate, and
• wherein the feeding point is located within a virtual area whose center is common to a center of the ground conductor plate and which is formed so as to have an area that is ½ of an area of the ground conductor plate by reducing the ground conductor plate by a same factor in longitudinal and lateral directions.

An antenna device comprising:

• a ground conductor plate;
• and
• an antenna element,
• wherein the antenna element includes:
• a first vertical portion and a second vertical portion which are erected substantially perpendicularly from the ground conductor plate, and
• a connecting portion which includes a portion extending substantially parallel to the ground conductor plate and which connects one end of the first vertical portion and one end of the second vertical portion to each other,
• wherein the other end of the first vertical portion serves as a feeding point and is located at a position that is distant from an outer periphery of the ground conductor plate to a center side of the ground conductor plate,
• wherein the other end of the second vertical portion is grounded,
• wherein the connecting portion includes an along-edge portion which extends along the outer periphery of the ground conductor plate when viewed from a direction perpendicular to the ground conductor plate, and
• wherein at least a part of the along-edge portion is located at a position that is closer to the ground conductor plate than the one end of the first vertical portion and the one end of the second vertical portion.