Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Reexamination Certificate
1999-11-22
2001-08-28
Le, Hoanganh (Department: 2821)
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
C343S816000, C343S795000
Reexamination Certificate
active
06281858
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates generally to an antenna and, more particularly, to an indoor, low cost, high performance, directional cellular band antenna employing a 90° truncated reflector housing and rectangular dipole elements.
2. Discussion of the Related Art
Many types of communications antennas exist in the art. Each various antenna design must provide suitable performance at the particular bandwidths of operation. For cellular telephones, the antenna must effectively receive and transmit signals in the 800-1050 MHz range. Certain building materials may significantly attenuate cellular band signals, thus reducing the ability of the telephone to operate effectively indoors. Therefore, it may be desirable to provide a cellular band antenna within a room or interior space that it electrically connected to an exterior antenna to provide suitable operation of the cellular telephones within the space. Several different requirements drive the design of these types of antennas. These requirements include low cost, ease of manufacture and assembly, ease of installation, ability to be inconspicuously mounted in the space, high performance over the desired bandwidths, suitable front-to-back ratio (FBR), and reliability.
State of the art antennas of this type include triangular dipoles, 90E corner reflector antennas, and radome antennas such as the Allen MicroFill indoor antennas, Model Nos. DB781 and DB791, and the Suhner planar antennas, known to those skilled in the art. However, improvements can be made in the existing antenna art to provide an increase in one or more of the above-described desirable features. It is therefore an object of the present invention to provide an indoor antenna operable in the cellular band frequency range that includes significant improvements over the state of the art antenna designs.
SUMMARY OF THE INVENTION
In accordance with the teachings of the present invention, an indoor cellular band antenna is disclosed that is low cost, easy to manufacture and assemble, easy to install, and has better performance than the comparable antennas existing in the art. The antenna has an outer metal housing including angled side panels, trapezoidal-shaped top and bottom panels and a rectangular-shaped back panel defining a 90E truncated corner configuration. A radome is positioned over the front of the housing by sliding it beneath extended clips formed to the side panels. An antenna dipole is mounted in the housing and includes two dipole members positioned to be substantial mirror images of each other except for minor differences. Each dipole member includes a rectangular dipole element, an extended transmission balun member, and a back mounting plate. The transmission balun members are parallel to each other and are spaced apart a predetermined distance to provide electromagnetic coupling between the dipole members. An antenna cable extends through the top panel of the housing to be connected through a distribution system to an exterior antenna. An outer conductor of the cable is electrically connected to the transmission balun member of one of the dipole members and an inner conductor is electrically connected to the dipole element of the same dipole member. The inner and outer conductors of the cable are mounted to the dipole portion by connectors formed from the dipole member.
Additional objectives, advantages, and features of the present invention will become apparent from the following description and appended claims, taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 3750185 (1973-07-01), Evans
patent: 5274391 (1993-12-01), Connolly
patent: 5481272 (1996-01-01), Yarsunas
patent: 5629713 (1997-05-01), Mailandt et al.
patent: 5691735 (1997-11-01), Butland et al.
patent: 5710569 (1998-01-01), Oh et al.
patent: 5724051 (1998-03-01), Mailandt et al.
Huber+Suhner AG, Radio Transmission Department, Herisau, Switzerland, “The Suhner Planar Antenna For Wireless Communication In The 1.7-2.5 GHz Range.”
Allen Telecom Group, Decibel Products Division, “DB781 MicroFill Indoor Antennas DB791 806-960 MHz.”
Belingheri Ralph A.
Humphrey Brent R.
Jennetti Anthony G.
Manassero Greg A.
Rucker Donald L.
Keller Robert W.
Le Hoang-anh
TRW Inc.
LandOfFree
High performance, directional cellular band 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 High performance, directional cellular band antenna, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High performance, directional cellular band antenna will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2491537