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A semiconductor module having a built-in antenna element for use in a system of a band of millimeter-waves or quasi-millimeter-waves comprises a substrate, an antenna element, a semiconductor integrated circuit, and a hermetically sealing portion. The antenna element is mounted on one side of the su

A semiconductor module having a built-in antenna element for use in a system of a band of millimeter-waves or quasi-millimeter-waves comprises a substrate, an antenna element, a semiconductor integrated circuit, and a hermetically sealing portion. The antenna element is mounted on one side of the substrate. The semiconductor integrated circuit is also formed on the same side of the substrate as of the antenna element. The semiconductor integrated circuit includes at least either of a transmitter signal processing circuit composed mainly of an amplifier circuit and a frequency converter circuit for processing a signal which is exploited in the system of the band of millimeter-waves or quasi-millimeter-waves and transmitted to the antenna element, and a receiver signal processing circuit composed mainly of an amplifier circuit and a frequency converter circuit for processing a signal which is received by the antenna element and exploited in the system of the band of millimeter-waves or quasi-millimeter-waves. The hermetically sealing portion is designed for hermetically sealing the antenna element and the semiconductor integrated circuit formed on the substrate within a common space defined by a boundary surface or the side of the substrate while the transmissivity of radio waves to the antenna element for the system of the band of millimeter-waves or quasi-millimeter-waves is maintained.

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[ What is claimed is:] [1.]1. A semiconductor module having a built-in antenna element for use in a system of a band of millimeter-waves or quasi-millimeter-waves, comprising:a substrate;an antenna element mounted on a side of said substrate;a semiconductor integrated circuit formed on the same side

[ What is claimed is:] [1.]1. A semiconductor module having a built-in antenna element for use in a system of a band of millimeter-waves or quasi-millimeter-waves, comprising:a substrate;an antenna element mounted on a side of said substrate;a semiconductor integrated circuit formed on the same side of said substrate, said semiconductor integrated circuit including at least one of (i) a transmitter signal processing circuit comprising an amplifier circuit and a frequency converter circuit for processing a signal which is exploited in the system of said band of millimeter-waves or quasi-millimeter-waves and transmitted to said antenna element, and (ii) a receiver signal processing circuit comprising an amplifier circuit and a frequency converter circuit for processing a signal which is received by the antenna element and exploited in the system of the band of millimeter-waves or quasi-millimeter-waves; anda hermetically sealing means for hermetically sealing said antenna element and said semiconductor integrated circuit within a common space defined by one of a boundary surface and the side of the substrate;wherein said hermetically sealing means comprises a window for maintaining a transmissivity of radio waves to said antenna element for the system of the band of millimeter-waves or quasi-millimeter-waves; andwherein said substrate comprises an electrically conductive platform. and said antenna element and said semiconductor integrated circuit are mounted on one side of the electrically conductive platform.