Communications: radio wave antennas – Antennas – Microstrip
Reexamination Certificate
2006-06-06
2006-06-06
Chen, Shih-Chao (Department: 2821)
Communications: radio wave antennas
Antennas
Microstrip
C343S725000
Reexamination Certificate
active
07057558
ABSTRACT:
A small antenna has two or more feeding ports. A radiator is made of a planar conductor having a substantially circular shape having the diameter of a substantially half wavelength or a substantially regularly polygonal shape where the length of a diagonal line passes through the center point is the substantially half wavelength. A ground plate is faced to the radiator. On the radiator, the feeding ports are connected to feeding points on two orthogonal line segments passing through the center of the radiator. This antenna is used as not only a single antenna but also two independent antennas having secured isolation between the feeding ports. A small antenna device used as two independent antennas is thus provided. The radiator is formed in a hat shape having an edge, has an Stepped Impedance Resonator (SIR) structure where the diameter of a crest part is a quarter wavelength, and is shortened.
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International Search Report corresponding to application No. PCT/JP03/08089 dated Sep. 2, 2003.
Fukushima Susumu
Yasuho Takeo
Chen Shih-Chao
Matsushita Electric - Industrial Co., Ltd.
RatnerPrestia
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