Communications: radio wave antennas – Antennas – Spiral or helical type
Reexamination Certificate
1998-12-07
2001-05-15
Wimer, Michael C. (Department: 2821)
Communications: radio wave antennas
Antennas
Spiral or helical type
C343S749000
Reexamination Certificate
active
06232930
ABSTRACT:
FIELD OF THE INVENTION
This invention is directed to antennas and more particularly to dual band antennae.
BACKGROUND OF THE INVENTION
The cellular communications industry including cellular telephones and the like use a range of frequencies between 800 and 900 megahertz (MHz). Cellular telephones, pagers, and the like generally use a whip or stub antenna that is tuned to provide optimum performance in the above frequency range. With the advent of personal communications services (PCS) for providing services such as data transmission, wireless voice mail, and the like, the Federal Communications Commission (FCC) has established a center frequency of 1.92 gigahertz (GHz) with a suitable band width, well known to one skilled in the art. As the new PCS technology expands, there is a need to provide devices that can receive and transmit communications in both the 800-900 MHz and 1.85 to 1.99 GHz frequency ranges. Cellular telephones and the like, therefore, need to have antennae that will operate at each of the two frequency ranges. One way to achieve this is to provide two separate antennae. It is more desirable and economical, however, to provide a single antenna having at least dual band capability.
SUMMARY OF THE INVENTION
This invention is directed to a dual band antenna including first and second members. The first member defines a coil having first and second ends and a plurality of windings including first and second selected windings between the ends, the first end being a feed point. The second member defines a reactive element having a conductive element disposed on a first surface of a dielectric film. The conductive element has a selected area and shape and extends to first and second ends associated with the first and second selected windings. The second member is at least partially wrapped around the coil with a second surface of the film adjacent to the windings and extending therealong at least between the first and second selected windings such that the first and second ends of the conductive element are adjacent to the first and second selected windings. The dielectric layer extends between the conductive element and the windings. At high frequencies, the second member forms a short circuit between the first and second selected windings and at low frequencies the second element is essentially electrically inactive.
The antenna can be tuned to desired frequencies by adjusting the dimensions and locations of the various components of the assembly. Such a dual band antenna may be utilized for both coaxial and non-coaxial connections with a cellular phone or the like.
An embodiment of the invention will now be described by way of example with reference to the accompanying drawings.
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The Whitaker Corporation
Wimer Michael C.
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