Communications: radio wave antennas – Antennas – Microstrip
Reexamination Certificate
2001-08-07
2003-04-22
Wong, Don (Department: 2821)
Communications: radio wave antennas
Antennas
Microstrip
C343S770000, C343S848000
Reexamination Certificate
active
06552685
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a flat antenna apparatus formed by laminating a plurality of plate bodies and elements, and more specifically, relates to a flat antenna apparatus in which the compatibility between the flat antenna apparatus and an electric circuit is improved, and lamination is facilitated to thereby improve productivity.
2. Prior Art
In the flat antenna apparatus which can attain high gain in the extremely high frequency band and the quasi-extremely high frequency band, heretofore, radiation elements, feeder lines, slots and non-feeding elements are formed on the FPC (Flexible Printed Circuit Board), respectively, layers consisting of these FPCs are laminated and a foaming agent is put between these layers, to thereby arrange each layer discretely.
With the flat antenna apparatus which obtains desired properties by laminating a plurality of plate bodies and elements, it is difficult to mount electrical components on the flat antenna apparatus in order to integrate this flat antenna apparatus and the electric circuit. This is expressed as compatibility between the flat antenna apparatus and the electric circuit is poor.
Moreover, the flat antenna apparatus has a problem in that the productivity thereof is poor, since accurate positioning of a plurality of plate bodies and elements is necessary for lamination.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a flat antenna apparatus which solves the above problems, improves the compatibility between the flat antenna apparatus and the electric circuit, and facilitates lamination to improve the productivity.
In order to achieve the above object, a first aspect of the present invention is a flat antenna apparatus wherein a radiation element consisting of a conductor arranged forward of a dielectric plate, an unnecessary radiation of shield conductive plate having a slot corresponding to the radiation element arranged forward of the radiation element, and an back ground plate arranged at the rearward of the dielectric plate, wherein the dielectric plate is constituted of a first dielectric substrate, the radiation element being constituted of a conductive plate arranged on the front face of the first dielectric substrate, the back ground plate being constituted of a conductive plate arranged on the rear face of the first dielectric substrate, and a second dielectric substrate is provided forward of the first dielectric substrate, the unnecessary radiation of shield conductive plate being constituted of a conductive plate provided on the front face of the second dielectric substrate, and these first and second dielectric substrate are overlapped on each other. This characteristic corresponds to claim
1
, and will be described as a first embodiment with reference to FIG.
1
.
Also, in the above flat antenna apparatus, the dielectric plate is constituted of a first dielectric substrate, a second dielectric substrate is provided forward of the first dielectric substrate, the unnecessary radiation of shield conductive plate being constituted of a conductive plate provided on the front face of the second dielectric substrate, and the radiation element being constituted of a conductive plate provided on the rear face of the second dielectric substrate, the back ground plate being constituted of a conductive plate arranged on the rear face of the first dielectric substrate, and these first and second dielectric substrates are overlapped on each other. This characteristic corresponds to claim
2
, and will be described as a modified embodiment of the first embodiment with reference to FIG.
1
.
A second aspect of the present invention is a flat antenna apparatus wherein a radiation element consisting of a conductor arranged forward of a dielectric plate, an unnecessary radiation of shield conductive plate having a slot corresponding to the radiation element arranged forward of the radiation element, a non-feeding element arranged forward of the unnecessary radiation of shield conductive plate and an back ground plate arranged at the rearward of the dielectric plate, wherein the dielectric plate is constituted of a first dielectric substrate, the radiation element being constituted of a conductive plate arranged on the front face of the first dielectric substrate and the back ground plate being constituted of a conductive plate provided on the rear face of the first dielectric substrate, a second dielectric substrate is provided forward of the first dielectric substrate, the unnecessary radiation of shield conductive plate being constituted of a conductive plate provided on the front face of the second dielectric substrate, and a third dielectric substrate is provided forward of the second dielectric substrate, the non-feeding element being constituted of a conductive plate provided on the front face of this third dielectric substrate, and these first, second and third dielectric substrates are overlapped on each other. This characteristic corresponds to claim
3
, and will be described as a second embodiment with reference to FIG.
2
.
Also, in the above flat antenna apparatus, the dielectric plate is constituted of a first dielectric substrate, the back ground plate being constituted of a conductive plate arranged on the rear face of the first dielectric substrate, a second dielectric substrate is provided forward of the first dielectric substrate, the radiation element being constituted of a conductive plate provided on the rear face of the second dielectric substrate, and a third dielectric substrate is provided forward of the second dielectric substrate, the unnecessary radiation of shield conductive plate being constituted of a conductive plate provided on the rear face of this third dielectric substrate, and the non-feeding element being constituted of a conductive plate provided on the front face of the third dielectric substrate, and these first, second and third dielectric substrates are overlapped on each other. This characteristic corresponds to claim
4
, and will be described as a first modified embodiment of the second embodiment with reference to FIG.
2
.
Also, in the above flat antenna apparatus, the dielectric plate is constituted of a first dielectric substrate, the radiation element being constituted of a conductive plate provided on the front face of this first dielectric substrate and the back ground plate being constituted of a conductive plate arranged on the rear face of the first dielectric substrate, a second dielectric substrate is provided forward of the first dielectric substrate, and a third dielectric substrate is provided forward of the second dielectric substrate, the unnecessary radiation of shield conductive plate being constituted of a conductive plate provided on the rear face of this third dielectric substrate, and the non-feeding element being constituted of a conductive plate provided on the front face of the third dielectric substrate, and these first, second and third dielectric substrates are overlapped on each other. This characteristic corresponds to claim
5
, and will be described as a second modified embodiment of the second embodiment with reference to FIG.
2
.
A third aspect of the present invention is a flat antenna apparatus wherein a radiation element consisting of a conductor arranged forward of a dielectric plate, a non-feeding element formed corresponding to the radiation element arranged forward of the radiation element, an unnecessary radiation of shield conductive plate having a slot corresponding to the radiation element arranged forward of the non-feeding element, and an back ground plate arranged at the rearward of the dielectric plate, wherein the dielectric plate is constituted of a first dielectric substrate, the radiation element being constituted of a conductive plate provided on the front face of this first dielectric substrate and the back ground plate being constituted of a conductive plate arranged on the rear face of the first dielectric substrate, a second
Antonelli Terry Stout & Kraus LLP
Chen Shih-Chao
Hitachi Cable Ltd.
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