Planar antenna

A planar antenna, defined with a first axis and a second axis, wherein the second axis is perpendicular to the first axis;

• the first axis is defined with a first direction and a second direction opposite to the first direction;
• the second axis is defined with a third direction and a fourth direction opposite to the third direction;
• the planar antenna comprises:
• a substrate having a surface;
• a first radiation element disposed on the surface of the substrate and having a first main section and a first radiation section, wherein the first main section has a first end and a second end along the first axis;
• the first end of the first main section is adapted to be fed with a signal;
• the first main section extends from the first end of the first main section to the second end of the first main section in the first direction;
• the first radiation section is connected to the second end of the first main section and is located on a side of the first main section in the third direction;
• a first ground element disposed on the surface of the substrate and having a second main section and a first ground section, wherein the second main section has a first end and a second end along the first axis;
• the second main section extends from the first end of the second main section to the second end of the second main section in the second direction;
• the first ground section is connected to the second end of the second main section and is located on a side of the second main section in the third direction;
• a second radiation element disposed on the surface of the substrate, wherein the second radiation element is located on a side of the first main section in the third direction and located on a side of the first radiation section in the second direction;
• the second radiation element has a first slot, wherein the first slot extends in the first direction and has a first open end and a first closed end;
• the first slot has a first inclined edge and a first straight edge;
• along the second axis, the first inclined edge is located between the first main section of the first radiation element and the first straight edge;
• a second ground element disposed on the surface of the substrate, wherein the second ground element is located on a side of the second main section in the third direction and located on a side of the first ground section in the first direction;
• the second ground element has a second slot, wherein the second slot extends in the second direction and has a second open end and a second closed end;
• the second open end corresponds to the first open end;
• a width of the second slot of the second ground element gradually increases in the second direction;
• wherein a separating slot is formed between the second radiation element and the second ground element and extends along the second axis;
• an end of the separating slot communicates with the first open end and the second open end;
• wherein the second radiation element is connected to the first main section of the first radiation element through a first connecting section;
• the second ground element is connected to the second main section of the first ground element through a second connecting section.