Abstract: A scanning antenna provided with an array of a plurality of antenna units includes a transmission and/or reception region including the plurality of antenna units, and a non-transmission and/or reception region other than the transmission and/or reception region. The scanning antenna includes a TFT substrate including a first dielectric substrate, a slot substrate including a second dielectric substrate and a slot electrode supported by a first main surface of the second dielectric substrate, a liquid crystal layer provided between the TFT substrate and the slot substrate, and a reflective conductive plate disposed facing a second main surface of the second dielectric substrate opposite to the first main surface with a dielectric layer interposed between the reflective conductive plate and the second main surface.

Abstract: A scanning antenna provided with an array of a plurality of antenna units includes a transmission and/or reception region including the plurality of antenna units, and a non-transmission and/or reception region other than the transmission and/or reception region. The scanning antenna includes a TFT substrate including a first dielectric substrate, a slot substrate including a second dielectric substrate and a slot electrode supported by a first main surface of the second dielectric substrate, a liquid crystal layer provided between the TFT substrate and the slot substrate, and a reflective conductive plate disposed facing a second main surface of the second dielectric substrate opposite to the first main surface with a dielectric layer interposed between the reflective conductive plate and the second main surface.

Abstract: A scanning antenna includes a transmission and/or reception region including a plurality of antenna units and a non-transmission and/or reception region located in a region other than the transmission and/or reception region. The scanning antenna includes a TFT substrate, a slot substrate, and a liquid crystal layer provided between the TFT substrate and the slot substrate. The scanning antenna includes: at least one monitoring capacitance section formed in the non-transmission and/or reception region, the section including a liquid crystal layer and a monitoring capacitance, which includes a first measurement electrode and a second measurement electrode opposing each other with the liquid crystal layer interposed therebetween; and a voltage monitor connectable to the first measurement electrode of the monitoring capacitance.

Abstract: A scanning antenna includes a transmission and/or reception region including a plurality of antenna units and a non-transmission and/or reception region located in a region other than the transmission and/or reception region. The scanning antenna includes a TFT substrate, a slot substrate, and a liquid crystal layer provided between the TFT substrate and the slot substrate. The scanning antenna includes: at least one monitoring capacitance section formed in the non-transmission and/or reception region, the section including a liquid crystal layer and a monitoring capacitance, which includes a first measurement electrode and a second measurement electrode opposing each other with the liquid crystal layer interposed therebetween; and a voltage monitor connectable to the first measurement electrode of the monitoring capacitance.