Communications: radio wave antennas – Antennas – With radio cabinet
Reexamination Certificate
2001-12-27
2003-11-18
Ho, Tan (Department: 2821)
Communications: radio wave antennas
Antennas
With radio cabinet
C343S7000MS, C343S846000
Reexamination Certificate
active
06650298
ABSTRACT:
FIELD OF THE INVENTIONS
The present inventions relate generally to internal multi-band antennas, and more particularly to dual-band internal antennas for dual-band communications devices and combinations thereof.
BACKGROUND OF THE INVENTIONS
As cellular telephone handsets continue to be reduced in size, consumers expect phones with either non-retractable antennas or internal antennas that are not at all visible. In general, retractable and stubby antennas work together with a ground plane provided the antenna is located away from the ground plane. When retractable and stubby antennas are located near the ground plane, the input impedance drops to very low values. Stubby antennas do not work well generally in close proximity of a ground plane.
Internal antennas are known generally as disclosed, for example, in U.S. Pat. No. 5,926,139 entitled “Planar Dual Frequency Band Antenna”. More particularly, the dual frequency antenna of U.S. Pat. No. 5,926,139 includes a ground plane separated by a dielectric from a planar radiating element having first and second inverted F-antenna portions joined by an interconnecting portion, which is coupled by to the ground plane by a ground pin. A feed pin coupled to the radiating element extends through the ground plane by an insulating via.
The various aspects, features and advantages of the present invention will become more fully apparent to those having ordinary skill in the art upon careful consideration of the following Detailed Description of the Invention with the accompanying drawings described below.
REFERENCES:
patent: 5926139 (1999-07-01), Korisch
patent: 6268831 (2001-07-01), Sanford
patent: 6346914 (2002-02-01), Annamaa
patent: 6448932 (2002-09-01), Stoiljkovic et al.
patent: 6456250 (2002-09-01), Ying et al.
patent: 6476769 (2002-11-01), Lehtola
patent: 6486837 (2002-11-01), Spiegel et al.
patent: 6504507 (2003-01-01), Geeraert
patent: 6515630 (2003-02-01), Honda
Abbasi Aamir
Harshbarger Michael
Bowler, II Rowland K.
Ho Tan
Motorola Inc.
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