Circularly polarized wave patch antenna with wide shortcircuit portion
First Claim
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1. An antenna, comprising:
- a dielectric substrate composed of a laminate of a plurality of substrate members, the dielectric substrate having first and second surfaces and a first laminate surface;
a first patch formed on the first surface of said dielectric substrate;
a second patch annularly formed on the first laminate surface of said dielectric substrate, the second patch having a center point with an inner periphery and an outer periphery surrounding the center point;
a ground conductor formed on the second surface of said dielectric substrate;
a first feeder portion for feeding a signal to a first position of said second patch;
a first shortcircuit portion connected between a second position and said ground conductor, the second position being located on the inner periphery of said second patch co-linear with and between the center point of said second patch and the first position;
a second shortcircuit portion connected between a third position on the inner periphery of said second patch and said ground conductor, the first and second shortcircuit portions having an electrically large width along the inner periphery of said second patch sufficient to control a resonance frequency of said antenna; and
a second feeder portion connected to said first patch and adapted for feeding a signal to a fourth position at least one of co-linear with and between the center point of said second patch and the second position and co-linear with and between the center point of said second patch and the third position.
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Abstract
A patch and a ground conductor are shortcircuited with two shortcircuit portions that are composed of conductive plates and that pass through a dielectric substrate. The shortcircuit portions are connected to the inner periphery of the patch and have large widths therealong. A first shortcircuit portion is disposed on a first line that connects a microstrip feeder line and the center point of the patch. A second shortcircuit portion is disposed on a second line that passes through the center point. The inner angle of the first line and the second line is in the range from 80 degrees to 110 degrees.
58 Citations
5 Claims
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1. An antenna, comprising:
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a dielectric substrate composed of a laminate of a plurality of substrate members, the dielectric substrate having first and second surfaces and a first laminate surface; a first patch formed on the first surface of said dielectric substrate; a second patch annularly formed on the first laminate surface of said dielectric substrate, the second patch having a center point with an inner periphery and an outer periphery surrounding the center point; a ground conductor formed on the second surface of said dielectric substrate; a first feeder portion for feeding a signal to a first position of said second patch; a first shortcircuit portion connected between a second position and said ground conductor, the second position being located on the inner periphery of said second patch co-linear with and between the center point of said second patch and the first position; a second shortcircuit portion connected between a third position on the inner periphery of said second patch and said ground conductor, the first and second shortcircuit portions having an electrically large width along the inner periphery of said second patch sufficient to control a resonance frequency of said antenna; and a second feeder portion connected to said first patch and adapted for feeding a signal to a fourth position at least one of co-linear with and between the center point of said second patch and the second position and co-linear with and between the center point of said second patch and the third position. - View Dependent Claims (2, 3, 4, 5)
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Specification