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- W2040295534 abstract "Abstract: At millimeter and submillimeter wavelengths, integrated-circuit antennas are often mounted on a substrate lens to eliminate losses due to substrate modes. This approach takes advantage of the fact that antennas on dielectrics are more sensitive to radiation from the substrate side. However, coupling efficiencies for these antennas have been limited to about 25% because of poor patterns and dielectric losses. We have solved these problems by fabricating the antennas on 1-μm thick silicon-oxynitride membranes (below left). The membranes are fabricated by depositing a 1-μm silicon-oxynitride layer on both sides of a silicon wafer by plasma-enhanced chemical vapor deposition. An opening is defined on the back of the wafer by patterning the silicon oxynitride with photoresist and etching it in a buffered-HF solution. Then the silicon is etched in an ethylenediamine-pyrocatechol solution until the transparent membrane is exposed. The membrane is much thinner than a wavelength, so that the antenna effectively radiates in free space. This approach eliminates the substrate lens and thus greatly reduces the dielectric losses, and allows the use of free-space antenna designs and techniques. The antenna patterns are bidirectional, so a reflector is needed to make the patterns unidirectional. The peak of the pattern is normal to the wafer." @default.
- W2040295534 created "2016-06-24" @default.
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- W2040295534 date "1987-09-24" @default.
- W2040295534 modified "2023-10-17" @default.
- W2040295534 title "Integrated-Circuit Antennas On Thin Membranes" @default.
- W2040295534 doi "https://doi.org/10.1117/12.940798" @default.
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