Microstrip antenna and wearable sensor terminal

A microstrip antenna comprising:

• a first metal layer that constitutes an antenna element;
• a second metal layer that constitutes a ground;
• and
• a flexible member that separates the first metal layer and the second metal layer by a predetermined distance,
• wherein the first metal layer and the second metal layer each are made of a metal having flexibility or made of a metal foil formed on a material having flexibility;
• wherein at least one of the first metal layer and the second metal layer is not adhered to the flexible member but is in close contact with the flexible member by a close contact unit;
• wherein the close contact unit is a clamping mechanism including a first plate, a second plate, and a connecting member;
• wherein the first plate and the second plate are connected to each other by the connecting member in a state that the first plate and the second plate face each other;
• and
• wherein the connecting member is an elastic body.