An antenna comprising: a plurality of microwave modules; a plurality of antenna elements; and a cooling plate sandwiched between a first microwave module and a second microwave module that are the microwave modules facing each other among the plurality of microwave modules, wherein each of the plurality of microwave modules includes: a plurality of microwave devices each configured to exchange a signal with a corresponding one of the plurality of antenna elements; and a microwave module substrate including a mounting surface on which the plurality of microwave devices are mounted, and being electrically connected to each of the plurality of antenna elements, wherein the plurality of antenna elements of the plurality of microwave modules are arrayed on a common plane surface, and the mounting surface of each of the plurality of microwave modules is perpendicular to the common plane surface, wherein each of the plurality of microwave devices includes: a multilayer substrate; a semiconductor element mounted on the multilayer substrate; a heat sink in contact with a surface of the semiconductor element on a side opposite to the multilayer substrate; a mold resin covering peripheries of the semiconductor element and the heat sink; an electromagnetic shield film that is in contact with the heat sink and is configured to cover a side surface of the multilayer substrate and the mold resin; and a ground terminal electrically connected to the electromagnetic shield film, wherein the cooling plate is provided between the plurality of microwave devices of the first microwave module and the plurality of microwave devices of the second microwave module. a plurality of microwave modules; a plurality of antenna elements; and a cooling plate sandwiched between a first microwave module and a second microwave module that are the microwave modules facing each other among the plurality of microwave modules, wherein each of the plurality of microwave modules includes: a plurality of microwave devices each configured to exchange a signal with a corresponding one of the plurality of antenna elements; and a microwave module substrate including a mounting surface on which the plurality of microwave devices are mounted, and being electrically connected to each of the plurality of antenna elements, wherein a plurality of microwave devices each configured to exchange a signal with a corresponding one of the plurality of antenna elements; and a microwave module substrate including a mounting surface on which the plurality of microwave devices are mounted, and being electrically connected to each of the plurality of antenna elements, wherein the plurality of antenna elements of the plurality of microwave modules are arrayed on a common plane surface, and the mounting surface of each of the plurality of microwave modules is perpendicular to the common plane surface, wherein each of the plurality of microwave devices includes: a multilayer substrate; a semiconductor element mounted on the multilayer substrate; a heat sink in contact with a surface of the semiconductor element on a side opposite to the multilayer substrate; a mold resin covering peripheries of the semiconductor element and the heat sink; an electromagnetic shield film that is in contact with the heat sink and is configured to cover a side surface of the multilayer substrate and the mold resin; and a ground terminal electrically connected to the electromagnetic shield film, wherein a multilayer substrate; a semiconductor element mounted on the multilayer substrate; a heat sink in contact with a surface of the semiconductor element on a side opposite to the multilayer substrate; a mold resin covering peripheries of the semiconductor element and the heat sink; an electromagnetic shield film that is in contact with the heat sink and is configured to cover a side surface of the multilayer substrate and the mold resin; and a ground terminal electrically connected to the electromagnetic shield film, wherein the cooling plate is provided between the plurality of microwave devices of the first microwave module and the plurality of microwave devices of the second microwave module.