Communications: radio wave antennas – Antennas – Microstrip
Reexamination Certificate
2006-01-17
2006-01-17
Wilmer, Michael C. (Department: 2828)
Communications: radio wave antennas
Antennas
Microstrip
C343S795000, C343S821000
Reexamination Certificate
active
06987483
ABSTRACT:
A effectively balanced dipole antenna is provided comprising an unbalanced microstrip antenna having a transmission line interface and a planar balun connected to the transmission line interface of the antenna. The balun can be coplanar or multi-planar. For example, a coplanar balun includes an unbalanced coplanar transmission line, with a signal line interposed between a pair of coplanar grounds, and a pair of planar stubs plan-wise adjacent the coplanar grounds. The coplanar grounds are connected to the plane stubs with conductive lines proximate to the antenna transmission line interface. A microstrip planar balun includes an unbalanced microstrip signal line, a microstrip ground formed on the dielectric layer underlying the signal line, and a pair of planar stubs, plan-wise adjacent the microstrip ground. The planar stubs can be located on the same dielectric layer as the signal line or the ground. A stripline planar balun is also provided.
REFERENCES:
patent: 3239838 (1966-03-01), Kelleher
patent: 4525720 (1985-06-01), Corzine et al.
patent: 4737797 (1988-04-01), Siwiak et al.
patent: 4746925 (1988-05-01), Toriyama
patent: 4847626 (1989-07-01), Kahler et al.
patent: 5892486 (1999-04-01), Cook et al.
Kyocera Wireless Corp.
Wilmer Michael C.
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