Abstract: [Problem] To provide a spacecraft having a more effective arrangement of amplifiers. [Solution] Provided is a spacecraft comprising: a main body having a housing space for housing an electronic device within; an oscillator configured to output a radio wave including a frequency in a predetermined frequency band; an amplifier disposed on an exterior of the main body so as to be exposed to space and configured to amplify the power of the radio wave output by the oscillator; and an antenna, disposed on the exterior of the main body, for emitting the radio wave to the outside at the power amplified by the amplifier.

Abstract: An antenna device includes a first antenna having a length corresponding to a first frequency, and arranged along a ground, a second antenna formed by a slot penetrating metal constituting the first antenna, and having a slot length corresponding to a second frequency higher than the first frequency, a first feeder wire for the first frequency, connected from the ground to the first antenna, a metal element for electromagnetic field coupling, arranged in a non-contact state relative to the second antenna, between the slot and the ground; and a second feeder wire for the second frequency, connected from the ground to the metal element.

Abstract: An antenna apparatus includes a ground substrate, a feeding point provided on the ground substrate, a first conductor device of which one end is electrically connected to the feeding point and which has a plate shape being parallel to the ground substrate, a second conductor device which is arranged between the first conductor device and the ground substrate, of which one end is electrically connected to the ground substrate, and which has a plate shape being parallel to the ground substrate and a connecting portion which electrically connects another end of the first conductor device and another end of the second conductor device to each other. A width of the first conductor device is wider than a width of the second conductor device. Lengths of the first conductor device and the second conductor device are ½ of a wavelength of a radio wave for operating the antenna apparatus.

Abstract: A spacecraft includes: a main-reflection unit configured to reflect and emit a radio wave outside, a sub-reflection unit configured to face the main-reflection unit, a radiator arranged to face the sub-reflection unit and configured to radiate the radio wave in a direction of the sub-reflection unit, a main body configured to be able to accommodate at least one part of the sub-reflection unit therein, and a delivery device connected to the sub-reflection unit and configured to deliver the sub-reflection unit, at least one part of which is accommodated in the main body, to a position where the sub-reflection unit is able to reflect the radio wave radiated from the radiator to the main-reflection unit and cause the main-reflection unit to radiate the radio wave outside.

Abstract: Spacecraft and antenna apparatus that can be more easily deployed from a stored state can include: a main-reflection unit including a plurality of ribs formed to be deployable in a stored state in which the ribs are folded and a sheet body provided between a plurality of the ribs and configured to be capable of reflecting a radio wave radiated from a radiator and emitting the radio wave outside, and a restriction member configured to restrict deployment of the plurality of ribs in the stored state, and release the restriction by operation of a restriction release member different from the main-reflection unit.

Abstract: An antenna apparatus includes a ground substrate, a feeding point provided on the ground substrate, a first loop antenna of which one end is electrically connected to the feeding point and of which another end is electrically connected to the ground substrate and moreover which operates at a first frequency, and a second loop antenna of which both ends are respectively connected to a first end point and a second end point of the first loop antenna and which operates at a second frequency. A space between the first end point and the second end point forms a gap with a range in which the first loop antenna is capable of resonating at the first frequency.

Abstract: An antenna device includes a substrate ground having a planar surface, a planar radiation element disposed in parallel and opposite to a planar portion of the substrate ground, a power feeding point connected to the planar radiation element, and a ground portion forming a stacked body in which, on a radiation surface side, ground patterns made of a conductive material are stacked from the radiation surface in a radiation direction perpendicular to the radiation surface. The ground pattern in each of layers of the stacked body is formed inwardly of a portion immediately overlying the ground pattern in another layer located on the radiation surface side, non-ground portions in which the conductive material is not disposed being formed in a portion immediately overlying the radiation surface, and the non-ground portions in the individual layers are formed to be gradually enlarged in the radiation direction.

Abstract: A printed circuit board includes a dielectric substrate which is formed in a plate-like shape, ground conductor layers which are respectively provided on a top surface and a back surface of the dielectric substrate, a signal line which is provided on a side surface of the dielectric substrate, and transmits a high frequency signal, and a plurality of connection conductors which are provided in the dielectric substrate, connects the ground conductor layer provided on the top surface and the ground conductor layer provided on the back surface, and are aligned and disposed along the signal line.

Abstract: An antenna device includes a metal layer for forming an antenna element in a predetermined planar shape and a ground arranged on a lower side of the metal layer. The metal layer forms a first metal forming the planar shape, a notch portion formed at the first metal, and cutting out a part of an edge of the planar shape, a second metal being an electromagnetic field coupling element arranged with a predetermined distance spaced from the first metal inside the notch portion, and a feeder line formed outside the planar shape, and to be connected with the second metal via an opening portion of the notch portion. For the second metal, a width at the opening portion is smaller than a maximum width at a portion more inside the notch portion than the opening portion.

Abstract: An antenna device includes a substrate ground having a planar surface, a planar radiation element disposed in parallel and opposite to a planar portion of the substrate ground, a power feeding point connected to the planar radiation element, and a ground portion forming a stacked body in which, on a radiation surface side, ground patterns made of a conductive material are stacked from the radiation surface in a radiation direction perpendicular to the radiation surface. The ground pattern in each of layers of the stacked body is formed inwardly of a portion immediately overlying the ground pattern in another layer located on the radiation surface side, non-ground portions in which the conductive material is not disposed being formed in a portion immediately overlying the radiation surface, and the non-ground portions in the individual layers are formed to be gradually enlarged in the radiation direction.

Abstract: An antenna device includes a first antenna having a length corresponding to a first frequency, and arranged along a ground, a second antenna formed by a slot penetrating metal constituting the first antenna, and having a slot length corresponding to a second frequency higher than the first frequency, a first feeder wire for the first frequency, connected from the ground to the first antenna, a metal element for electromagnetic field coupling, arranged in a non-contact state relative to the second antenna, between the slot and the ground; and a second feeder wire for the second frequency, connected from the ground to the metal element.

Abstract: [Problem] To provide a spacecraft having a more effective arrangement of amplifiers. [Solution] Provided is a spacecraft comprising: a main body having a housing space for housing an electronic device within; an oscillator configured to output a radio wave including a frequency in a predetermined frequency band; an amplifier disposed on an exterior of the main body so as to be exposed to space and configured to amplify the power of the radio wave output by the oscillator; and an antenna, disposed on the exterior of the main body, for emitting the radio wave to the outside at the power amplified by the amplifier.

Abstract: An apparatus includes circuitry configured to calculate first parameters for determining a structure of a first antenna device based on a specification value set for the first antenna device to be a target of performance evaluation, acquire a communication frequency based on first parameters, calculate an allowable range of deviation of the communication frequency satisfying a specified performance evaluation standard of the first antenna device, determine a structure of a second antenna device as a reference model, and obtain a change amount corresponding to change in the communication frequency in the allowable range of two second parameters having a correlation with each other, and acquire a relational expression of two first parameters of first parameters that correspond to the two second parameters and that have a correlation with each other, and two first parameters based on the change amount and that have the correlation with each other.

Abstract: A wireless terminal cover is attached to a plate-like wireless terminal. The wireless terminal cover includes a bottom part that is in contact with the backside of the attached wireless terminal while covering the backside and is made of a dielectric having a relative dielectric constant of 1 to 10, wall parts that are in contact with the sides of the attached wireless terminal while surrounding the sides and are made of the dielectric, and a plurality of conductive elements placed in line on at least one of the bottom part and the wall part. The conductive elements are formed such that the length of the longest one of lines, each of which connects any two points on the conductive elements, is 0.1 to 0.4 times the effective wavelength of radio waves in the dielectric, the radio waves being used for radio communications by the wireless terminal.

Abstract: An antenna apparatus includes a ground substrate, a feeding point provided on the ground substrate, a first loop antenna of which one end is electrically connected to the feeding point and of which another end is electrically connected to the ground substrate and moreover which operates at a first frequency, and a second loop antenna of which both ends are respectively connected to a first end point and a second end point of the first loop antenna and which operates at a second frequency. A space between the first end point and the second end point forms a gap with a range in which the first loop antenna is capable of resonating at the first frequency.

Abstract: An antenna apparatus includes a ground substrate, a feeding point provided on the ground substrate, a first conductor device of which one end is electrically connected to the feeding point and which has a plate shape being parallel to the ground substrate, a second conductor device which is arranged between the first conductor device and the ground substrate, of which one end is electrically connected to the ground substrate, and which has a plate shape being parallel to the ground substrate and a connecting portion which electrically connects another end of the first conductor device and another end of the second conductor device to each other. A width of the first conductor device is wider than a width of the second conductor device. Lengths of the first conductor device and the second conductor device are ½ of a wavelength of a radio wave for operating the antenna apparatus.

Abstract: Deployable reflectors and antennas and spacecraft using such reflectors are disclosed. An example disclosed reflector includes: a hub having a cross-section formed in a circular, elliptical or polygonal shape; a plurality of ribs, each rib having an inner side surface facing an outer peripheral side of the hub when folded, and an outer side surface that is a surface opposite to the inner side surface, the plurality of ribs being folded to be wound around an outer periphery of the hub such that the inner side surface of each rib and the outer side surface of its adjacent rib partially face each other or the outer side surface of each rib and the inner side surface of its adjacent rib partially face each other, each rib being deployed in a parabolic shape; and a sheet installed across each of the plurality of ribs and capable of reflecting radio waves.

Abstract: Antenna apparatus and spacecraft to be deployed in a more compactly stored state are disclosed. In an example of the disclosed technology, a spacecraft includes: a main-reflection unit configured to reflect and emit a radio wave outside, a sub-reflection unit configured to face the main-reflection unit, a radiator arranged to face the sub-reflection unit and configured to radiate the radio wave in a direction of the sub-reflection unit, a main body configured to be able to accommodate at least one part of the sub-reflection unit therein, and a delivery device connected to the sub-reflection unit and configured to deliver the sub-reflection unit, at least one part of which is accommodated in the main body, to a position where the sub-reflection unit is able to reflect the radio wave radiated from the radiator to the main-reflection unit and cause the main-reflection unit to radiate the radio wave outside.

Abstract: Antenna apparatus and spacecraft to be deployed in a more easily stored state are disclosed. In an example of the disclosed technology, and antenna apparatus includes: a main-reflection unit including a plurality of ribs formed to be deployable in a stored state in which the ribs are folded and a sheet body provided between a plurality of the ribs and configured to be capable of reflecting a radio wave radiated from a radiator and emitting the radio wave outside, and a restriction member configured to restrict deployment of the plurality of ribs in the stored state, and release the restriction by operation of a restriction release member different from the main-reflection unit.

Abstract: A wireless terminal cover is attached to a plate-like wireless terminal. The wireless terminal cover includes a bottom part that is in contact with the backside of the attached wireless terminal while covering the backside and is made of a dielectric having a relative dielectric constant of 1 to 10, wall parts that are in contact with the sides of the attached wireless terminal while surrounding the sides and are made of the dielectric, and a plurality of conductive elements placed in line on at least one of the bottom part and the wall part. The conductive elements are formed such that the length of the longest one of lines, each of which connects any two points on the conductive elements, is 0.1 to 0.4 times the effective wavelength of radio waves in the dielectric, the radio waves being used for radio communications by the wireless terminal.