Miniature wideband antenna with parasitic element

A wideband antenna disposed on a substrate, comprising:

• a grounding sheet having a first inner side extending along a first direction, a second inner side connected to the first inner side and extending along a second direction and a third inner side connected to the second inner side and opposite to the first inner side, wherein the first, the second and the third inner sides form an opening near an outer side of the substrate;
• a main radiator including:
• a feeding point near the second inner side;
• a first radiator extending from the feeding point along the first direction to a turning point;
• and
• a second radiator extending from the turning point toward the third inner side along the second direction;
• and
• a parasitic element extending from the third inner side along the second direction toward the first inner side, wherein a first gap is formed between the parasitic element and the second radiator.

A wideband antenna disposed on a substrate having a first surface and a second surface opposite to the first surface, comprising:

• a first grounding sheet disposed on the first surface, and having a first inner side along a first direction, a second inner side connected to the first inner side and extending along a second direction and a third inner side connected to the second inner side and opposite to the first inner side, wherein the first, the second and the third inner sides form an opening near an outer side of the substrate;
• a main radiator including:
• a feeding point near the second inner side;
• a first radiator extending from the feeding point along the first direction to a turning point;
• and
• a second radiator extended from the turning point toward the third inner side along the second direction;
• and
• a parasitic element disposed along the second direction, wherein a first gap is formed between the parasitic element and the second radiator.