Antenna and method of making same

Details Antenna and method of making same Antenna and method of making same

2000-01-28

2001-01-30

Wong, Don (Department: 2821)

Communications: radio wave antennas

Antennas

Microstrip

C343S702000

Reexamination Certificate

active

06181282

ABSTRACT:

FIELD OF THE INVENTION
This invention is directed to antennae 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.
Additionally it is desirable to have an antenna that is compact, flexible, resistant to impact and is protected from the environment.
SUMMARY OF THE INVENTION
This invention is directed to a dual band antenna that includes a substantially flat dielectric substrate having a base and an extended portion. An active antenna element is disposed on one surface of the extended portion and a parasitic element is disposed on an opposed surface. The active element has a selected design, shown representatively as a serpentine pattern having first and second ends, the first end being a feed point that extends into the base. The parasitic element is disposed in an essentially straight line and extends between a selected portion of the serpentine pattern. The base further includes a ground plate on the same side as the parasitic element.
The antenna is encapsulated in a dielectric material to provide both environmental and mechanical protection for the antenna. The encapsulation is accomplished in a two step molding process. In the first molding step at least one protrusion is formed on each surface of the substrate forming a subassembly. The protrusions are used to precisely position the subassembly in a second mold cavity for molding a layer over the remaining surfaces of the substrate. Using the protrusions to position the antenna subassembly in the second cavity eliminates the need for metal positioning pins that leave holes when the completed antenna is removed from the mold. Additionally the materials used in the two step process may be of different durometers thus, for example, providing a flexible edge and a stiffer body.
An embodiment of the invention will now be described by way of example with reference to the accompanying drawings.


REFERENCES:
patent: 5594455 (1997-01-01), Hori et al.
patent: 6040803 (2000-03-01), Spall
patent: 6100848 (2000-08-01), Hayes

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