Antenna

Details Antenna Antenna

2000-05-08

2001-10-09

Ho, Tan (Department: 2821)

Communications: radio wave antennas

Antennas

Microstrip

C343S767000, C343S769000

Reexamination Certificate

active

06300908

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to the field of antennas.
More precisely still the present invention relates to the field of antennas operating with regard to a particular mode comprising:
a first electrically conductive surface, generally dubbed a “capacitive roof”,
a second electrically conductive surface forming a ground plane, parallel to the first surface,
a first electrically conductive feed wire or strip which links a first terminal of a generator/receiver to the first surface and a second feed wire or strip which links a second terminal of the generator/receiver to the second surface, and
at least one electrically conductive wire or strip which links the two aforesaid surfaces.
2. Description of the Related Art
Examples of such antennas are described, for example in the documents FR-A-2 668 859 and EP-A-667 984.
Thus, the document FR-A-2 668 859 has described an antenna of the aforesaid type comprising a single wire or strip linking the two surfaces, which wire or strip is arranged so as to be traversed by a current at the working frequency and so as to be coupled by inductive coupling to the feed wire or strip linking the generator to the first surface. It has been shown that this antenna generates, under certain conditions of layout of the elements, a radiation of monopole type, that is to say comprising an axisymmetric lobe, with maximum radiation parallel to the ground plane and zero radiation perpendicular to the antenna, linear polarization with electric field in a plane perpendicular to the antenna and near hemispherical coverage except on the axis.
The document EP-A-667 984 describes a variant of this antenna comprising several parallel wires or strips linking the two surfaces. This arrangement makes it possible in particular to facilitate the matching of the antenna to the generator.
The antennas of the aforesaid type have already rendered great service.
BRIEF SUMMARY OF THE INVENTION
The aim of the present invention is however to propose a novel antenna which can take reduced dimensions with respect to the working wavelength not only in the horizontal plane like the antennas described in the documents FR-A-2 668 859 and EP-A-667 984, but also in the vertical direction where the height is very small of the order of &lgr;/200.
This aim is achieved within the framework of the present invention by virtue of the antenna of the aforesaid type, characterized in that the two surfaces and the wire(s) or strip(s) for linking these surfaces are all coplanar.
As appropriate at least the wire or strip ensuring the link between the generator/receiver and the first surface is also coplanar with the aforesaid elements.


REFERENCES:
patent: 2885676 (1959-05-01), Baldwin
patent: 3086204 (1963-04-01), Alford
patent: 3216016 (1965-11-01), Tanner
patent: 4063246 (1977-12-01), Greiser
patent: 4291312 (1981-09-01), Kaloi
patent: 4367475 (1983-01-01), Schiavone
patent: 4766440 (1988-08-01), Gegan
patent: 4873529 (1989-10-01), Gibson
patent: 5565875 (1996-10-01), Buralli et al.
patent: 5872542 (1999-02-01), Simons et al.
patent: 0 375 415 (1990-06-01), None

Affiliated with

Also associated with

Rating

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 Antenna, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Antenna will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2575025