Multiple element antenna from a single piece

Details Multiple element antenna from a single piece Multiple element antenna from a single piece

2000-05-05

2001-05-08

Phan, Tho (Department: 2821)

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

C343S789000

Reexamination Certificate

active

06229496

ABSTRACT:

FIELD OF THE INVENTION
This invention relates generally to antenna systems and, more articularly, relates to broadband antennas.
BACKGROUND OF THE INVENTION
Broadband antennas used in wireless telecommunication systems are designed to receive or transmit linear polarized electromagnetic signals. The sense or direction of linear polarization is measured from a fixed axis and can range from horizontal polarization (90 degrees) to vertical polarization (0 degrees). Many broadband antennas are designed to employ dipole elements to receive or transmit the signals. These elements are mounted above an artificial ground plane, which is typically an electrically conducting plate, and the elements are connected together via feed lines. These feed lines are often in the form of coaxial cable.
The dipole elements are typically made from multiple pieces and soldered or welded together. As the number of dipole elements is increased, the manufacture of the antenna increases in complexity, time-consumption, and expense. For high frequency operation, the expense increases further due to the tolerances required for operation in the desired frequency range. What is needed is a way to economically produce the elements and the antenna assembly.
SUMMARY OF THE INVENTION
In view of the foregoing, a multi-dipole element is manufactured from a single sheet of a low loss conducting material. The multi-dipole element may be stamped, punched, cut, or etched and then bent into the proper shape or alternatively die-cast. The multi-dipole element forms horizontally or vertically stacked radiation elements and the support. The multi-dipole element is attached to a reflector plate and the element is assembled to the feed line perpendicular to the reflector plate.
At the center of each feed of the multi-dipole element is a tab that is bent at either an upward angle or a downward angle and the tabs form a symmetrical axis in the center of a slot formed by the multi-dipole element. The tabs attenuate the radiation caused by the slot.
Several dipoles can be added to achieve different radiation patterns. The dipole elements can also be formed into different shapes to achieve different lobe shapes.


REFERENCES:
patent: 2978703 (1961-04-01), Kuecken
patent: 4498085 (1985-02-01), Schwarzmann
patent: 5418545 (1995-05-01), Pantsios et al.
patent: 5532707 (1996-07-01), Klinger et al.
patent: 5724051 (1998-03-01), Mailandt et al.
patent: 5909195 (1999-06-01), Merenda
patent: 5936590 (1999-08-01), Funder
patent: 6005522 (1999-12-01), Arias et al.
patent: 6020861 (2000-02-01), Jonsson et al.
patent: 6034649 (2000-03-01), Wilson et al.

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