Patch antenna and application thereof

A wireless network apparatus used in a wireless system for covering the bandwidth utilized in Industrial-Scientific-Medical (ISM) band, said wireless network apparatus comprising:

• a base board, wherein said base board has a radio frequency (RF) device, and said radio frequency device has an antenna output terminal used for transmitting signals between said radio frequency device and said wireless system;
• a first patch antenna, located on one end of said base board, wherein said first patch antenna comprises:
• a first radiating metal plate, wherein said first radiating plate is a first round plate having a first stripe-shaped opening, and is located at said first predetermined distance from said base board, and said first stripe-shaped opening is in a substantially rectangular form diametrically extending through the edge of said first radiating metal plate, and said first stripe-shaped opening is composed of two first parallel sides and a first connecting side vertically connecting said two first parallel sides, and the average length of said first stripe-shaped opening is shorter than the radius of said first round plate, and said first predetermined distance is longer than the average length of said first stripe-shaped opening;
• a first metal supporting plate, wherein one end of said first metal supporting plate is electrically connected to said first connecting side of said first stripe-shaped opening and a first feeding point is formed thereon;
• and
• a first metal fixed plate, wherein one end of said first metal fixed plate is electrically connected to the other end of said first supporting plate, and said first metal fixed plate is electrically installed on said antenna output terminal;
• a second patch antenna, located on the same end where said first patch antenna is located, wherein said second patch antenna comprises:
• a second radiating metal plate, wherein said second radiating metal plate is a second round plate having a second stripe-shaped opening, and is located at said second predetermined distance from said base board, and said second stripe-shaped opening is in a substantially rectangular form diametrically extending through the edge of said second radiating metal plate, and said second stripe-shaped opening is composed of two second parallel sides and a second connecting side vertically connecting said two second parallel sides, and the average length of said second stripe-shaped opening is shorter than the radius of said second round plate, and said second predetermined distance is longer than the average length of said second stripe-shaped opening;
• a second metal supporting plate, wherein one end of said second metal supporting plate is electrically connected to said second connecting side of said second stripe-shaped opening and a second feeding point is formed thereon;
• and
• a second metal fixed plate, wherein one end of said second metal fixed plate is electrically connected to the other end of said second stripe-shaped supporting plate, and said second metal fixed plate is electrically installed on said antenna output terminal;
• and
• a housing, having a convex hollow portion used for covering a portion of said base board, wherein said first patch antenna and said second patch antenna are located inside said convex hollow portion, and there is an designated distance between the top of said convex hollow portion and said first radiating metal plate and said second radiating metal plate.