Abstract: An antenna apparatus has a dielectric substrate and conductors. The antenna apparatus includes an antenna element which is arranged on a main surface of the dielectric substrate and has directivity ahead of the main surface, and a directional characteristic control member which includes a sidewall part which projects ahead of the main surface on at least one side of directivity of the antenna element with respect to the antenna element, and a roof part which projects in a direction of the antenna element from the sidewall part at a predetermined angle of more than 70° and less than 120° with respect to the sidewall part so that orthogonal projection to the main surface does not reach the antenna element, to reflect or absorb radio waves.

Abstract: Disclosed is a titanium or titanium alloy plate rolled in one direction, wherein a lubricating film is coated on the surface and the coefficient of sliding friction of the lubricating film-coated surface is controlled to less than 0.15. The elongation (L-El) of the titanium or titanium alloy plate in the rolling direction and the r value (T-r) in the direction perpendicular to the rolling direction have the following relation (1). (T-r)/(L-El)?0.

Abstract: A radar apparatus is provided that is capable of providing desired directivity without preventing downsizing of the apparatus. In the radar apparatus, an antenna for at least either transmitting radar waves or receiving reflected waves is protected by a radome. Provided on an opposing face that is a face of the radome opposing the antenna is a wall section protruding from the opposing face of the radome into a space of the radome and extending along at least a portion of an outline of an aperture projection. The aperture projection is a projection of an aperture of the antenna onto the opposing face in a normal direction to the aperture.

Abstract: An antenna apparatus has a dielectric substrate and conductors. The antenna apparatus includes an antenna element which is arranged on a main surface of the dielectric substrate and has directivity ahead of the main surface, and a directional characteristic control member which includes a sidewall part which projects ahead of the main surface on at least one side of directivity of the antenna element with respect to the antenna element, and a roof part which projects in a direction of the antenna element from the sidewall part at a predetermined angle of more than 70° and less than 120° with respect to the sidewall part so that orthogonal projection to the main surface does not reach the antenna element, to reflect or absorb radio waves.

Abstract: An original plate material for a heat-exchanging plate fabricated by press working and a method for fabricating the original plate material are provided. An original plate material for a heat-exchanging plate is a flat plate material made of titanium on the surface of which convex parts and concave parts are formed, and the heat-exchanging plate is fabricated by press working the original plate material. The convex parts and the concave parts are formed in a manner such that the shape parameter defined by (Rz×L/P) is 12 ?m or less, where Rz (?m) denotes the height of the convex parts, L (?m) denotes the width of the concave parts, and P (?m) denotes the pitch between neighboring convex parts.

Abstract: An antenna section is housed in a housing space which is defined by a radome and a housing, and provided with a transmitting antenna that transmits radar waves composed of radio waves of a predetermined frequency and a receiving antenna that receives the radar waves. The radome has a transmission section that is a portion transmitting the radar waves and an attenuation section that is a portion attenuating the radar waves. The attenuation section includes a first attenuation layer formed of a material for attenuating the radar waves. The first attenuation layer has a thickness that is 2n?1 times (n is a natural number) of one-quarter of a wavelength of the radar waves in the first attenuation layer.

Abstract: Disclosed is a pure titanium sheet having a strength corresponding to JIS Grade 2 level (215 MPa in terms of 0.2% yield strength) or more and having satisfactory stamping formability. The pure titanium sheet includes titanium and inevitable impurities, has a 0.2% yield strength of 215 MPa or more, has an average grain size d of its structure of 25 ?m or more and 75 ?m or less, and has a hexagonal crystal structure, in which respective grains in the hexagonal crystal structure have an average of Schmidt factors (SF) of (11-22) twins with a rolling direction as axes, and the average Schmidt factor (SF) and the average grain size d satisfy following Expression (1): 0.055?[SF/?d]?0.084??(1).

Abstract: An antenna apparatus has a dielectric substrate and conductors. The antenna apparatus includes an antenna element which is arranged on a main surface of the dielectric substrate and has directivity ahead of the main surface, and a directional characteristic control member which includes a sidewall part which projects ahead of the main surface on at least one side of directivity of the antenna element with respect to the antenna element, and a roof part which projects in a direction of the antenna element from the sidewall part at a predetermined angle of more than 70° and less than 120° with respect to the sidewall part so that orthogonal projection to the main surface does not reach the antenna element, to reflect or absorb radio waves.

Abstract: A radar apparatus is provided that is capable of providing desired directivity without preventing downsizing of the apparatus. In the radar apparatus, an antenna for at least either transmitting radar waves or receiving reflected waves is protected by a radome. Provided on an opposing face that is a face of the radome opposing the antenna is a wall section protruding from the opposing face of the radome into a space of the radome and extending along at least a portion of an outline of an aperture projection. The aperture projection is a projection of an aperture of the antenna onto the opposing face in a normal direction to the aperture.

Abstract: An antenna section is housed in a housing space which is defined by a radome and a housing, and provided with a transmitting antenna that transmits radar waves composed of radio waves of a predetermined frequency and a receiving antenna that receives the radar waves. The radome has a transmission section that is a portion transmitting the radar waves and an attenuation section that is a portion attenuating the radar waves. The attenuation section includes a first attenuation layer formed of a material for attenuating the radar waves. The first attenuation layer has a thickness that is 2n?1 times (n is a natural number) of one-quarter of a wavelength of the radar waves in the first attenuation layer.

Abstract: An original plate material for a heat exchanging plate includes a titanium flat plate material including a minute recess and projections on the surface thereof, and the flat plate material is press-worked to obtain the heat exchanging plate. The shape parameter, defined as [height (?m) of the projections]×[width (?m) of the recess/pitch (?m) of adjacent projections], is 85 ?m or less. Relating to this original plate material for a heat exchanging plate, the shape parameter, defined as [height (?m) of the projections]×[width (?m) of the recess/pitch (?m) of adjacent projections/angle (deg) of the projections], is 0.94 ?m/deg or less.

Abstract: Provided is an original plate material for a heat-exchanging plate fabricated by press working, and also provided is a method for fabricating the original plate material. An original plate material (2) for a heat-exchanging plate (4) is a flat plate material (1) made of titanium on the surface of which convex parts and concave parts are formed, and the heat-exchanging plate (4) is then fabricated by press working the original plate material (2). The convex parts (5) and the concave parts (6) are formed in a manner such that the shape parameter defined by (Rz×L/P) is 12 ?m or less, where Rz (?m) denotes the height of the convex parts (5), L (?m) denotes the width of the concave parts (6), and P (?m) denotes the pitch between neighboring convex parts (5).

Abstract: A high-frequency member assembly has two high-frequency members of which surfaces are attached to each other. Each member has a rectangular waveguide hole penetrating through the member and two choke grooves opened on the attaching surface. The waveguide holes communicate with each other to form a rectangular waveguide. An electromagnetic wave is transmitted through the waveguide. Each choke groove extends straight along a side of an end of the waveguide hole opened on the attaching surface to be away from the end of the waveguide hole by one quarter of the wavelength of the wave. The depth of each choke groove is equal to one quarter of the wavelength. The choke grooves of one member communicate with the choke grooves of the other member to substantially surround the waveguide with the choke grooves in an attaching area between the member.

Abstract: An antenna device has a divider producing first and second signals, and amplifiers amplifying the signals at a changeable amplitude ratio of the first signal to the second signal. A Rotman lens gives first phase differences to first high frequency waves, produced from the first amplified signal at an input port and transmitted to output ports, and gives second phase differences to second high frequency waves produced from the second amplified signal at another input port and transmitted to the output ports. An antenna forms a beam composed of electromagnetic waves, having the first phase differences and electric power corresponding to the first amplified signal on an antenna surface, and electromagnetic waves, having the second phase differences and electric power corresponding to the second amplified signal on the antenna surface, and radiates the beam in a particular direction corresponding to the phase differences and the amplitude ratio.

Abstract: Disclosed is a pure titanium sheet having a strength corresponding to JIS Grade 2 level (215 MPa in terms of 0.2% yield strength) or more and having satisfactory stamping formability. The pure titanium sheet includes titanium and inevitable impurities, has a 0.2% yield strength of 215 MPa or more, has an average grain size d of its structure of 25 ?m or more and 75 ?m or less, and has a hexagonal crystal structure, in which respective grains in the hexagonal crystal structure have an average of Schmidt factors (SF) of (11-22) twins with a rolling direction as axes, and the average Schmidt factor (SF) and the average grain size d satisfy following Expression (1): 0.055?[SF/?d]?0.

Abstract: There are provided a waveguide plate that is made of metallic plates through which through holes are formed and a pair of resin made substrates (first and second substrates) on which a grounding pattern is formed to cover the through holes. Both the waveguide plate and the substrates are laminated with each other using a conductive adhesive such that the waveguide plate is sandwiched by the substrates, whereby a rectangular waveguide is provided. The first substrate has high frequency circuits such as an oscillator that generates high frequency signals. The high frequency signals generated by the oscillator are supplied to an antenna section that is formed on the second substrate via the rectangular waveguide.

Abstract: Long-side length a1 to a5 of rectangular waveguide tubes in a long-side direction (magnetic field direction) become greater, the shorter a line length is (the closer a rectangular waveguide tube is to the center). ai and Li are set such that line lengths L1 to L5 of each rectangular waveguide tube is Li=m?gi (i=1 to 5, and m is a positive integer number), with guide wavelengths of each rectangular waveguide tube, determined by the length a1 to a5, as ?g1 to ?g5. Hence, the line length Li of each rectangular waveguide tube can be arbitrarily set, while maintaining a phase relationship between high frequency signals transmitted by each rectangular waveguide tube. When a difference in line lengths between rectangular waveguide tubes is set to be shorter, the degree of freedom in arrangement of the rectangular waveguide tubes can be improved while suppressing the degradation of propagation characteristics caused by temperature change.

Abstract: Disclosed is a titanium or titanium alloy plate rolled in one direction, wherein a lubricating film is coated on the surface and the coefficient of sliding friction of the lubricating film-coated surface is controlled to less than 0.15. The elongation (L-El) of the titanium or titanium alloy plate in the rolling direction and the r value (T-r) in the direction perpendicular to the rolling direction have the following relation (1). (T-r)/(L-El)?0.

Abstract: A transmission line transition for coupling electromagnetic energy between different transmission lines includes first and second dielectric substrates laminated to each other and a waveguide tube attached to the first dielectric substrate. The laminated dielectric substrate provides a dielectric waveguide having a first end short-circuited and a second end communicating with a hollow interior of the waveguide tube. An antenna connected to a planar line is disposed in the dielectric waveguide and spaced from the short-circuited end of the dielectric waveguide by a predetermined distance in a longitudinal direction of the waveguide tube to excite and to be excited by the waveguide tube. The dielectric waveguide has a cross-sectional area smaller than that of the interior of the waveguide tube and coincides with the interior of the waveguide tube in the longitudinal direction.

Abstract: The radar apparatus includes an antenna device including a transmitting antenna and a receiving antenna, a main body which generates a radar wave, transmits the radar wave from the transmitting antenna, and receives the radar wave reflected from an obstacle to be detected by the receiving antenna, and a cover member covering the main body and the antenna device on a side of a transmission direction of the radar wave and located out of contact with the main body and the antenna device. The cover member has a transmission portion allowing the radar wave to pass therethrough, a surface of the transmission portion facing the antenna device being inclined by an angle greater than 3 degrees with respect to an antenna surface of the receiving antenna.