Dual-frequency microstrip antenna with inserted strips
AssigneeThe United States of America as represented by the Secretary of the Army
InventorsVahakn Nalbandian, Choon S. Lee
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Abstract
A dual-frequency microstrip antenna has three strips of bare low-dielectric aterial alternating with two strips of copper-clad (one side) high-dielectric material bonded close together on a copper plate having a feed inserted therethrough. A copper-claded layer (one side) low-dielectric material is placed over the five strips and bonded simultaneously. The inner strips separate the region of high-dielectric constant from the region of low-dielectric constant. The microstrip antenna is considered to be a lossy resonating cavity enclosed by a perfect electric conductor and by a perfect magnetic conductor.
Claims9
A dual-frequency microstrip antenna comprising:
- a conductive ground plate means having a feed inserted therethrough;
- at least three strips of a first dielectric material bonded to the conductive ground plate means in a spatially-separated manner, the first dielectric material having a first dielectric constant;
- at least two strips of a second dielectric material bonded to the conductive ground plate means at locations within spaces separating the three strips of the first dielectric material, the strips of a second dielectric material having a conductive cladding which is separated from the conductive ground plate means and the feed, and the strips of a second dielectric material having a second dielectric constant which is higher than the first dielectric constant;
- and
- a dielectric covering over an upper surface of the three strips of the first dielectric material and over an upper surface of the two strips of the second dielectric material, the dielectric covering having a radiating conductive cladding which electrically contacts the feed;
- wherein the three strips of the first dielectric material form low dielectric regions and the two strips of the second dielectric material form high dielectric regions, and wherein the high and low dielectric regions establish low and high resonance regions, respectively, wherein fields of lower resonance are excited in the high dielectric regions and exponentially decay in the low dielectric regions and fields of higher resonance are excited in the low dielectric regions.
Dependencies are inferred from the claim text.