Scanning antenna and method for manufacturing scanning antenna

A scanning antenna with a transmission and/or reception region including a plurality of antenna units and a non-transmission and/or reception region other than the transmission and/or reception region, the scanning antenna comprising:

• a TFT substrate including a first dielectric substrate, and a plurality of TFTs, a plurality of gate bus lines, a plurality of source bus lines, and a plurality of patch electrodes supported by the first dielectric substrate;
• a slot substrate including a second dielectric substrate and a slot electrode formed on a first main surface of the second dielectric substrate, the slot electrode including a plurality of slots arranged corresponding to the plurality of patch electrodes;
• a liquid crystal layer provided between the TFT substrate and the slot substrate;
• a seal portion provided in the non-transmission and/or reception region and surrounding the liquid crystal layer;
• and
• a reflective conductive plate disposed opposing a second main surface of the second dielectric substrate, the second main surface corresponding to a side opposite to the first main surface, with a dielectric layer interposed between the reflective conductive plate and the second main surface,
• wherein the slot electrode includes an opening or a recessed portion formed in the non-transmission and/or reception region and within a region surrounded by the seal portion.