(12) United States Patent ao) Patent No.: Us 7,183,981 Bi
Chao (45) Date of Patent: Feb. 27,2007
(54) MONOPOLE ANTENNA
(75) Inventor: Wen-Shin Chao, Taichung (TW)
(73) Assignee: Arcadyan Technology Corporation,
Hsinchu (TW)
( * ) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 36 days.
(21) Appl. No.: 11/217,372
(22) Filed: Sep. 2, 2005
(51) Int. CI.
H01Q 1/38 (2006.01)
(52) U.S. CI 343/700 MS; 343/846
(58) Field of Classification Search 343/700 MS,
343/702, 829, 846 See application file for complete search history.
(56) References Cited
U.S. PATENT DOCUMENTS
4,864,320 A * 9/1989 Munson et al 343/833
5,550,554 A * 8/1996 Erkocevic 343/828
5,668,560 A * 9/1997 Evans et al 343/702
6,100,850 A * 8/2000 Utsumi 343/702
7,126,544 B2* 10/2006 Liu et al 343/700 MS
2003/0189522 Al* 10/2003 Zailinger 343/702
* cited by examiner
Primary Examiner—Tho Phan
(74) Attorney, Agent, or Firm—Rosenberg, Klein & Lee (57) ABSTRACT
A monopole antenna is disclosed. The monopole antenna comprises a base board, a first substantially L-shaped conductor, a first ground plane, a second substantially L-shaped conductor, a second ground plane and a feeding strip, and the monopole antenna further has a plurality of evenly-distributed through holes penetrating the base board from the first substantially L-shaped conductor to the second substantially L-shaped conductor. When the monopole antenna is operated at about 2.4-2.5 GHz, good radiation patterns and antenna gain are obtained for being applicable to IEEE802.11b/g specifications.
20 Claims, 8 Drawing Sheets
