| CPC G01N 22/04 (2013.01) [G01N 33/246 (2013.01); H01Q 17/00 (2013.01); G01N 33/245 (2024.05); H01Q 1/225 (2013.01)] | 17 Claims |
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1. A sensor device, comprising:
a transmission antenna configured to transmit a signal as electromagnetic waves;
a reception antenna configured to receive the electromagnetic waves transmitted from the transmission antenna and transmitted through a medium;
a measurement unit configured to measure the electromagnetic waves propagating to the reception antenna; and
a sensor casing,
further comprising an electronic substrate including a plurality of wiring layers,
wherein the electronic substrate includes a transmission substrate part, a reception substrate part, and a substrate part including the measurement unit,
the sensor device alternatively further comprising a first coating layer that, in a part of the transmission substrate part, coats an outer circumference of the substrate and is formed from an electromagnetic wave absorbent material and a second coating layer that, in a part of the reception substrate part, coats an outer circumference of the substrate and is formed from an electromagnetic wave absorbent material,
wherein the sensor casing includes a transmission probe casing that is a part of the sensor casing and houses the transmission substrate part and a reception probe casing that is another part of the sensor casing and houses the reception substrate part, wherein the transmission substrate part includes a transmission line for transmission and a transmission slot antenna,
wherein the transmission line for transmission is formed using a wiring layer included in the transmission substrate part, includes a first shield layer and a first signal line overlapping each other, and is electrically connected to the measurement unit,
wherein the transmission slot antenna includes a radiation element including a slot and a transmission slot signal line part that is electrically connected to the first signal line and intersects with the slot, the radiation element being a conductor electrically connected to the first shield layer,
wherein the transmission slot antenna is connected to the transmission line for transmission,
wherein the reception substrate part includes a transmission line for reception and a reception slot antenna,
wherein the transmission line for reception is formed using a wiring layer included in the reception substrate part, includes a second shield layer and a second signal line overlapping each other, and is electrically connected to the measurement unit,
wherein the reception slot antenna includes a reception element including a slot and a reception slot signal line part that is electrically connected to the second signal line and intersects with the slot, the reception element being a conductor electrically connected to the second shield layer,
wherein the reception slot antenna is connected to the transmission line for reception,
wherein each of the radiation element including the transmission slot and the reception element including the reception slot has both a size of a second direction that is a direction orthogonal to a first direction and is parallel to an extending direction of the transmission line and a size of a third direction that is orthogonal to the first and second directions to be larger than a size of the first direction that is a direction of the overlapping and extends in parallel with a plane set by the second direction and the third direction, and
wherein the transmission line for transmission and the radiation element formed using a wiring layer included in the transmission substrate part and the transmission line for reception and the reception element formed using a wiring layer included in the reception substrate are arranged such that the plane of the radiation element and the plane of the reception element are on the same plane, are arranged at positions separate away from each other by a predetermined distance, and have the extending directions and the positions fixed inside the sensor casing.
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