Abstract: A terahertz device includes a substrate having a front surface, a conductive layer formed on the front surface, an annular slot formed in the conductive layer, and first and second active elements disposed in the slot to oscillate or detect electromagnetic waves. The conductive layer includes a first electrode defined by the slot, and a second electrode surrounding the first electrode with the slot located in between. The first active element and the second active element are disposed at opposite sides of the first electrode on a straight reference line that extends through a center of the first electrode as viewed in a plan view taken from a direction orthogonal to the front surface. A first distance between opposite ends of the second electrode on the straight reference line is less than a first substrate distance between opposite ends of the substrate on the straight reference line.

Abstract: A terahertz device includes slots formed in a conductive layer, connection slits formed in the conductive layer, and active elements disposed in the slots. The slots are annular. The conductive layer includes first electrodes defined by the slots, a connection line disposed in the connecting slits and electrically connecting the first electrodes located inside two adjacent ones of the slots, and a second electrode located outside the slots. Each of the connecting slits connects the two adjacent ones of the slots and insulates the connection line from the second electrode. The active elements include two active elements provided for each of the first electrodes. The two active elements are located at opposite sides of the corresponding one of the first electrodes with respect to a center of the corresponding one of the slots in a plan view taken from a direction orthogonal to the front surface.

Abstract: A terahertz device includes a terahertz element that allows oscillation and radiation of electromagnetic waves in the terahertz band and a waveguide having a transmission region for transmitting electromagnetic waves. The terahertz element has an element principal surface and an element rear surface which face oppositely, an oscillation point for the oscillation of electromagnetic waves on the element principal surface, and a radiation point for the radiation of electromagnetic waves. The terahertz element is disposed such that the oscillation point and the radiation point are placed in the transmission region.

Abstract: A terahertz module includes: a terahertz chip which includes an active device which emits a terahertz wave; and a dielectric substrate coupled to the terahertz chip. The terahertz chip includes a semiconductor substrate. The active device is disposed on an upper surface of the semiconductor substrate. A cutout is formed in a portion of a first side surface, among a plurality of side surfaces of the dielectric substrate, the cutout extending from an upper side of the first side surface to a lower side of the first side surface. The terahertz chip is fit into the cutout in such a direction that the upper surface of the semiconductor substrate is parallel to the first side surface and the semiconductor substrate is arranged in a bottom side of the cutout.

Abstract: A semiconductor device includes a semiconductor element, a base and a first waveguide. The semiconductor element oscillates and radiates electromagnetic waves. The base includes a retaining cavity that retains the semiconductor element. The first waveguide includes a first waveguide passage connected to the retaining cavity. The first waveguide passage is configured to transmit the electromagnetic waves in a fundamental mode. The retaining cavity is a resonant cavity in which the electromagnetic waves resonate in a high-order mode.

Abstract: A terahertz device (A1) comprises a terahertz element (50) that allows oscillation and radiation of electromagnetic waves in the terahertz band and a waveguide (10) having a transmission region (101) for transmitting electromagnetic waves. The terahertz element (50) has an element principal surface (501) and an element rear surface (502) which face oppositely, an oscillation point (P1) for the oscillation of electromagnetic waves on the element principal surface (501), and a radiation point (P2) for the radiation of electromagnetic waves. The terahertz element (50) is disposed such that the oscillation point (P1) and the radiation point (P2) are placed in the transmission region (101).

Abstract: A terahertz module includes: a terahertz chip which includes an active device which emits a terahertz wave; and a dielectric substrate coupled to the terahertz chip. The terahertz chip includes a semiconductor substrate. The active device is disposed on an upper surface of the semiconductor substrate. A cutout is formed in a portion of a first side surface, among a plurality of side surfaces of the dielectric substrate, the cutout extending from an upper side of the first side surface to a lower side of the first side surface. The terahertz chip is fit into the cutout in such a direction that the upper surface of the semiconductor substrate is parallel to the first side surface and the semiconductor substrate is arranged in a bottom side of the cutout.

Abstract: Oxygen-containing gas discharge passages are provided in a first metal separator of a fuel cell of a fuel cell stack. The oxygen-containing gas discharge passages include an upper oxygen-containing gas discharge passages and a lower oxygen-containing gas discharge passage. In the first metal separator, a central position at the center between the upper oxygen-containing gas discharge passage and the lower oxygen-containing gas discharge passage is positioned below the center of an oxygen-containing gas flow field in the gravity direction.

Abstract: In a power generating cell, on a surface on a side opposite from an electrolyte membrane in an anode, there are provided an outer peripheral surface positioned on an outer peripheral portion of the anode, a central surface located more inwardly than an inner peripheral portion of a resin frame member, and a stepped portion connecting the outer peripheral surface and the central surface to each other. A height of the central surface from the electrolyte membrane is lower than that of the outer peripheral surface. A protruding end surface of an end linear protrusion is in contact with the central surface.

Abstract: A power generation cell includes a resin film equipped MEA and a first metal separator. The first metal separator includes an oxygen-containing gas flow field, an outer peripheral bead, and a first bypass stopping convex portion. An oxygen-containing gas flows across the oxygen-containing gas flow field along an electrode surface. The outer peripheral bead surrounds the oxygen-containing gas flow field to prevent leakage of a reactant gas. The first bypass stopping convex portion extends from the outer peripheral bead. A corner of a cathode on at least one end in the flow field direction of the oxygen-containing gas flow field is overlapped with an apex portion of the first bypass stopping convex portion.

Abstract: A fuel cell includes an MEA, a first separator, and a second separator. A frame member is provided around an outer peripheral portion of an MEA, and held between the first separator and the second separator. The height of an oxygen-containing gas flow field formed by the second separator, from the MEA is larger than the height of a fuel gas flow field formed by the first separator, from the MEA. The central position of the MEA in the thickness direction and the central position of the frame member outer peripheral portion of the frame member in the thickness direction are offset from each other.

Abstract: Second inlet connection flow grooves and second outlet connection flow grooves are formed in a power generation cell. The second inlet connection flow grooves connect a fuel gas supply passage and a fuel gas flow field. The second outlet connection flow grooves connect a fuel gas discharge passage and the fuel gas flow field. The flow channel of the second inlet connection flow grooves diverges multiple times in an area from the fuel gas supply passage to the fuel gas flow field. The flow channel of the second outlet connection flow grooves merges multiple times in an area from the fuel gas flow field to the fuel gas discharge passage. The number of merging in the second outlet connection flow grooves is larger than the number of diverging in the second inlet connection flow grooves.

Abstract: Oxygen-containing gas discharge passages are provided in a first metal separator of a fuel cell of a fuel cell stack. The oxygen-containing gas discharge passages include an upper oxygen-containing gas discharge passages and a lower oxygen-containing gas discharge passage. In the first metal separator, a central position at the center between the upper oxygen-containing gas discharge passage and the lower oxygen-containing gas discharge passage is positioned below the center of an oxygen-containing gas flow field in the gravity direction.

Abstract: Second inlet connection flow grooves and second outlet connection flow grooves are formed in a power generation cell. The second inlet connection flow grooves connect a fuel gas supply passage and a fuel gas flow field. The second outlet connection flow grooves connect a fuel gas discharge passage and the fuel gas flow field. The flow channel of the second inlet connection flow grooves diverges multiple times in an area from the fuel gas supply passage to the fuel gas flow field. The flow channel of the second outlet connection flow grooves merges multiple times in an area from the fuel gas flow field to the fuel gas discharge passage. The number of merging in the second outlet connection flow grooves is larger than the number of diverging in the second inlet connection flow grooves.

Abstract: A power generation cell includes a resin film equipped MEA and a first metal separator. The first metal separator includes an oxygen-containing gas flow field, an outer peripheral bead, and a first bypass stopping convex portion. An oxygen-containing gas flows across the oxygen-containing gas flow field along an electrode surface. The outer peripheral bead surrounds the oxygen-containing gas flow field to prevent leakage of a reactant gas. The first bypass stopping convex portion extends from the outer peripheral bead. A corner of a cathode on at least one end in the flow field direction of the oxygen-containing gas flow field is overlapped with an apex portion of the first bypass stopping convex portion.

Abstract: In a power generating cell, on a surface on a side opposite from an electrolyte membrane in an anode, there are provided an outer peripheral surface positioned on an outer peripheral portion of the anode, a central surface located more inwardly than an inner peripheral portion of a resin frame member, and a stepped portion connecting the outer peripheral surface and the central surface to each other. A height of the central surface from the electrolyte membrane is lower than that of the outer peripheral surface. A protruding end surface of an end linear protrusion is in contact with the central surface.

Abstract: A fuel cell includes an MEA, a first separator, and a second separator. A frame member is provided around an outer peripheral portion of an MEA, and held between the first separator and the second separator. The height of an oxygen-containing gas flow field formed by the second separator, from the MEA is larger than the height of a fuel gas flow field formed by the first separator, from the MEA. The central position of the MEA in the thickness direction and the central position of the frame member outer peripheral portion of the frame member in the thickness direction are offset from each other.