Communications: radio wave antennas – Antennas – Microstrip
Reexamination Certificate
2000-10-10
2002-07-16
Ho, Tan (Department: 2821)
Communications: radio wave antennas
Antennas
Microstrip
C343S833000, C343S846000
Reexamination Certificate
active
06421014
ABSTRACT:
TECHNICAL FIELD
The present invention relates to antennas and more particularly to a compact dual narrow band microstrip antenna that is particularly suited for wireless meter applications.
1. Background Art
Systems for wireless meter applications are often positioned beside buildings in urban areas and are subject to multipath reflections from other buildings. The portable reading equipment for such systems may be randomly oriented causing rotation of polarization. An antenna for a wireless meter application should be sensitive to two perpendicular orientations with good isotropic characteristics.
2. Disclosure of the Invention
A compact dual band microstrip antenna having a dielectric with a directly fed first radiating element and a spaced, coplanar, parasitic second radiating element on a first side of the dielectric, and a ground plane on an opposite second side of the dielectric is disclosed. Each radiating element has a reactance window and each radiating element is partially shorted to the ground plane by a plurality of spaced shorting posts extending through the dielectric. A uniform gap of a selected width separates the radiating elements. A feed point in the form of a hole extending through the dielectric connects to the directly fed radiating element near the gap. An opening is provided around the feed point on the side of the dielectric with the ground plane to electrically isolate the feed point from the ground plane. The ground plane is truncated.
REFERENCES:
patent: 4370657 (1983-01-01), Kaloi
patent: 5420596 (1995-05-01), Burrell et al.
patent: 5486836 (1996-01-01), Kuffner et al.
patent: 5526003 (1996-06-01), Oqawa et al.
patent: 5627550 (1997-05-01), Sanad
patent: 5703600 (1997-12-01), Burrell et al.
patent: 5801660 (1998-09-01), Ohtsuka et al.
patent: 5828345 (1998-10-01), Waterman et al.
patent: 5850198 (1998-12-01), Lindenmeier et al.
patent: 5917450 (1999-06-01), Tsunekawa et al.
patent: 5926137 (1999-07-01), Nealy
patent: 5926139 (1999-07-01), Korisch
patent: 5929812 (1999-07-01), Aminzadeh
patent: 5929813 (1999-07-01), Eggleston
patent: 5943015 (1999-08-01), Webb
patent: 5943020 (1999-08-01), Liebendoerfer et al.
patent: 5952971 (1999-09-01), Strickland
patent: 5955994 (1999-09-01), Staker et al.
patent: 5986606 (1999-11-01), Kossiavas et al.
patent: 5995047 (1999-11-01), Freyssinier et al.
Ho Tan
Lewis, Jr. Ancel W.
LandOfFree
Compact dual narrow band microstrip antenna does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Compact dual narrow band microstrip antenna, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Compact dual narrow band microstrip antenna will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2841637