Multi-band antenna

A multi-band antenna which has a low frequency bandwidth and an up frequency bandwidth two to three times frequency upper than said low frequency bandwidth comprising:

• an elongated radiating conductor made substantially of metallic substances having a first end and a second end;
• a rectangle radiating conductor extending from an elongated edge of said elongated radiating conductor near said first end of said elongated radiating conductor;
• and
• a feeding body having a feeding portion extending from said rectangle radiating conductor, a length from said feeding body connecting said rectangle radiating conductor to said first end of said elongated radiating conductor substantially a quarter wavelength of said high frequency bandwidth, a length from said feeding body connecting said rectangle radiating conductor to said second end of said elongated radiating conductor substantially a quarter wavelength of said low frequency bandwidth.

A multi-band antenna comprising:

• a first radiating conductor having elongated edges;
• a second radiating conductor extending from and perpendicular to one end of said first radiating conductor, a length of said first radiating conductor longer than a length of said second radiating conductor;
• a third radiating conductor extending from the same elongated edge of said first radiating conductor where said second radiating conductor extending from, a width of said third radiating conductor larger than said width of said first radiating conductor, said length of said first radiating conductor longer than a length of said third radiating conductor;
• a feeding body arranged at the vicinity of a corner of said third radiating conductor closing said second radiating conductor, said feeding body having a first U-shape portion and a second U-shape portion, both said first and second U-shape portion sharing a common side arm, the opening of said first U-shape facing to said second radiating conductor and one end of said first U-shape portion connecting said third radiating conductor, the opening of said second U-shape portion facing opposite to said second radiating conductor, a feeding portion extends from one end of the second U-shape portion;
• a first capacitor arranged at said common side arm and connected said first U-shape portion and said second U-shape portion;
• and
• a grounding portion arranged about said feeding portion of said feeding body.