Planar radiation antenna elements and omni directional antenna using such antenna elements
First Claim
Patent Images
1. A flat surface or planar antenna element for an antenna comprising:
- a first frame-type antenna element with a pair of short side portions, a pair of long side portions, and a feed point mounted to the long side, said element having a short side ratio to the long side ratio of between about 1;
4 and 1;
8 and wherein the length of a long side portion is approximately equal to the wavelength of a first selected frequency and the short side portion is between about 1/3 to about 1/2 the length of the long side portion, said feed point being located at approximately the central point of the long side, such that each of said two short side portions and long side portions may be excited at the same time;
a short bar mounted at a selected distance from both end points of said pair of long sides;
the short sides mounted on the end points of said pair of long sides so as to form a frame-type antenna element having a perimeter forming an endless conductor; and
said pair of long sides being formed symmetrically around a central portion of said long sides such that a first portion at one end of a long side is bent at an angle of between 45 degrees and 90 degrees with respect to said central portion and a second portion at the other end is bent so as to be parallel to said first portion, and said first and second portions extend from said central portion in opposite directions from each other.
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Abstract
An antenna of the long frame-type wherein the ratio between the long side and the short side is between 1:4 and 1:8 and the length of the long side is equivalent to one wavelength of the central frequency. One pair of short bars are deployed so that they are located at a distance corresponding to 1/4th to 1/40th of the distance from both end parts of the entire long side length of each long side element. The two end portions of the long side of the antenna is symmetrically bent with respect to a central portion such that the two end portions form an angle of 45 to 90 degrees with respect to the central portion and are parallel to each other.
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Citations
5 Claims
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1. A flat surface or planar antenna element for an antenna comprising:
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a first frame-type antenna element with a pair of short side portions, a pair of long side portions, and a feed point mounted to the long side, said element having a short side ratio to the long side ratio of between about 1;
4 and 1;
8 and wherein the length of a long side portion is approximately equal to the wavelength of a first selected frequency and the short side portion is between about 1/3 to about 1/2 the length of the long side portion, said feed point being located at approximately the central point of the long side, such that each of said two short side portions and long side portions may be excited at the same time;a short bar mounted at a selected distance from both end points of said pair of long sides; the short sides mounted on the end points of said pair of long sides so as to form a frame-type antenna element having a perimeter forming an endless conductor; and said pair of long sides being formed symmetrically around a central portion of said long sides such that a first portion at one end of a long side is bent at an angle of between 45 degrees and 90 degrees with respect to said central portion and a second portion at the other end is bent so as to be parallel to said first portion, and said first and second portions extend from said central portion in opposite directions from each other. - View Dependent Claims (2, 3, 4)
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5. An antenna element comprising:
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a frame-type element with a pair of short side portions, a pair of long side portions, and a feed point mounted to the long side, said element having a short side ratio to the long side ratio of between about 1;
4 and 1;
8 and wherein the long side length is approximately equal to the wavelength of a first selected frequency, said feed point being located at approximately the central point of the long side;said long side being formed in the shape of a regular polygon having an odd number of angles and an odd number of sides such that the end points of the long side are located adjacent to each other in a non-contacting manner to form one of the angles and are bent to form said short sides, the centermost side of said regular polygon being bent at a central point to create the center of the regular polygon; an insulation member connected between the two end points of said long sides so as to maintain a constant gap therebetween; a feed point formed at the central portion of said centermost side of said polygon; and a pair of short bars mounted one each at a selected distance from both end points.
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Specification