US 7,457,650 B2
Portable radio communication apparatus provided with boom portion with through hole
Hiroshi Iwai, Katano (Japan); Shinji Kamaeguchi, Kadoma (Japan); Kenichi Yamada, Yokohama (Japan); Toshihiro Asahina, Yokohama (Japan); and Atsushi Yamamoto, Osaka (Japan)
Assigned to Matsushita Electric Industrial Co., Ltd., Osaka (Japan)
Filed on Jul. 30, 2003, as Appl. No. 10/629,634.
Claims priority of application No. P2002-222785 (JP), filed on Jul. 31, 2002; and application No. P2003-018752 (JP), filed on Jan. 28, 2003.
Prior Publication US 2005/0075082 A1, Apr. 07, 2005
Int. Cl. H04B 1/38 (2006.01)
U.S. Cl. 455—575.7  [455/83; 455/90.3; 455/97; 455/575.1; 455/575.3; 343/702; 343/704; 343/767; 343/866] 19 Claims
OG exemplary drawing
 
1. A portable radio communication apparatus comprising:
a housing containing a radio communication circuit;
a projection portion having a first end portion connected to said housing, a second end portion connected to said housing, and a central portion located between the first and second end portions, said projection portion configured to project from said housing at an obtuse angle thereto;
a grounding conductor arranged in said housing; and
an antenna element connected to the radio communication circuit through a feeding point above said grounding conductor,
wherein at least one part of said antenna element is mounted in at least one of an inner part and a surface of said projection portion,
wherein an unbalanced antenna is formed by the antenna element and the grounding conductor, and
wherein, when said housing is supported on a flat surface, a surface of said housing opposes the flat surface and is floated from the flat surface by said projection portion so as to form the obtuse angle between said projection portion and the surface of said housing, thereby separating the grounding conductor of said antenna element from the flat surface, and suppressing any deterioration of antenna gain due to electromagnetic coupling of the grounding conductor with the flat surface.