Antenna apparatus
First Claim
1. An antenna apparatus in which n dielectric layers having t1 -tn in thickness, and ε
-
r1 -ε
rn in dielectric constant are respectively stacked between a major radiating conductor and a ground plate in turn from the side of said ground plate, said antenna apparatus defining the thicknesses t1 -tn of said n dielectric layers so as to satisfy substantially the following equation with respect to a dielectric constant ε
reff of an antenna defined by a desired beam width;
space="preserve" listing-type="equation">(t.sub.1 +t.sub.2 + . . . +t.sub.n)/(t.sub.1 /ε
.sub.r1 +t.sub.2 /ε
.sub.r2 + . . . +t.sub.n /ε
.sub.rn)=ε
.sub.reffand satisfy substantially the following equation with respect to the minimum value tmin of a thickness between the major radiating conductor and ground plate capable of ensuring desired operation band and low reflection losses in said dielectric constant ε
reff ;
space="preserve" listing-type="equation">t.sub.1 +t.sub.2 + . . . +t.sub.n =t.sub.min ;
wherein a thickness holding structure is provided on any one of the dielectric layers except the n-th layer for keeping the thickness of the dielectric layer substantially constant with low rigidity.
1 Assignment
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Accused Products
Abstract
In an antenna apparatus in which n dielectric layers with εr1 -εrn in dielectric constants are respectively stacked between a ground plate and a major radiating conductor, the thickness t1 -tn of the dielectric layers are determined so as to satisfy substantially the following equations:
(t.sub.1 +t.sub.2 + . . . +t.sub.n)/(t.sub.1 /ε.sub.r1 +t.sub.2
/εr2 + . . . +tn /εrn)=εreff, and
t.sub.1 +t.sub.2 + . . . t.sub.n =t.sub.min
with respect to a dielectric constant εreff of the antenna defined for a desired beam width, and the minimum value tmin of the dielectric layers capable of ensuring a desired operation band and low reflection losses in this dielectric constant εreff. Thus, the thinnest antenna structure which can ensure a desired radiation in directions of low elevation angles, and desired operation bands and low reflection losses can be made.
34 Citations
15 Claims
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1. An antenna apparatus in which n dielectric layers having t1 -tn in thickness, and ε
-
r1 -ε
rn in dielectric constant are respectively stacked between a major radiating conductor and a ground plate in turn from the side of said ground plate, said antenna apparatus defining the thicknesses t1 -tn of said n dielectric layers so as to satisfy substantially the following equation with respect to a dielectric constant ε
reff of an antenna defined by a desired beam width;
space="preserve" listing-type="equation">(t.sub.1 +t.sub.2 + . . . +t.sub.n)/(t.sub.1 /ε
.sub.r1 +t.sub.2 /ε
.sub.r2 + . . . +t.sub.n /ε
.sub.rn)=ε
.sub.reffand satisfy substantially the following equation with respect to the minimum value tmin of a thickness between the major radiating conductor and ground plate capable of ensuring desired operation band and low reflection losses in said dielectric constant ε
reff ;
space="preserve" listing-type="equation">t.sub.1 +t.sub.2 + . . . +t.sub.n =t.sub.min ;wherein a thickness holding structure is provided on any one of the dielectric layers except the n-th layer for keeping the thickness of the dielectric layer substantially constant with low rigidity. - View Dependent Claims (2, 3, 4, 11, 12, 13, 14, 15)
-
r1 -ε
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5. An antenna apparatus in which n dielectric layers having t1 -tn in thickness, and ε
-
r1 -ε
rn in dielectric constant are respectively stacked between a major radiating conductor and a ground plate in turn from the side of said ground plate, said antenna apparatus defining the thicknesses t1 -tn of said n dielectric layers so as to satisfy substantially the following equation with respect to a dielectric constant ε
reff of an antenna defined by a desired beam width;
space="preserve" listing-type="equation">(t.sub.1 +t.sub.2 + . . . +t.sub.n)/(t.sub.1 /ε
.sub.r1 +t.sub.2 /ε
.sub.r2 + . . . +t.sub.n /ε
.sub.rn)=ε
.sub.reffand satisfy substantially the following equation with respect to the minimum value tmin of a thickness between the major radiating conductor and ground plate capable of ensuring desired operation band and low reflection losses in said dielectric constant ε
reff ;
space="preserve" listing-type="equation">t.sub.1 +t.sub.2 + . . . +t.sub.n =t.sub.min ;said antenna apparatus further comprising; a major radiating conductor formed on the n-th dielectric layer which is not fed; a feed radiating conductor, formed on a dielectric layer except the n-th layer, for driving said major radiating conductor; and a feeding circuit for feeding said feed radiating conductor; wherein the feed radiating conductor and feeding circuit are formed by use of a film substrate disposed on a rigid dielectric layer;
a buffer material is disposed on said film substrate; and
a rigid dielectric layer is disposed on said buffer material. - View Dependent Claims (6, 7, 8)
-
r1 -ε
-
9. An antenna apparatus in which n dielectric layers having t1 -tn in thickness, and ε
-
r1 -ε
rn in dielectric constant are respectively stacked between a major radiating conductor and a ground plate in turn from the side of said ground plate, said antenna apparatus defining the thicknesses t1 -tn of said n dielectric layers so as to satisfy substantially the following equation with respect to a dielectric constant ε
reff of an antenna defined by a desired beam width;
space="preserve" listing-type="equation">(t.sub.1 +t.sub.2 + . . . +t.sub.n)/(t.sub.1 /ε
.sub.r1 +t.sub.2 /ε
.sub.r2 + . . . +t.sub.n /ε
.sub.rn)=ε
.sub.reffand satisfy substantially the following equation with respect to the minimum value tmin of a thickness between the major radiating conductor and ground plate capable of ensuring desired operation band and low reflection losses in said dielectric constant ε
reff ;
space="preserve" listing-type="equation">t.sub.1 +t.sub.2 + . . . +t.sub.n =t.sub.min ;said antenna apparatus further comprising; a major radiating conductor formed on the n-th dielectric layer which is not fed; a feed radiating conductor, formed on a dielectric layer except the n-th layer, for driving said major radiating conductor; and a feeding circuit for feeding said feed radiating conductor; wherein all of part of the dielectric layers on the side of said major radiating conductor from the feed radiating conductor and feeding circuit are removed except at the perimeters of the major radiating conductor and feed radiating conductor. - View Dependent Claims (10)
-
r1 -ε
Specification