ANTENNA APPARATUS

A plurality of primary radiators () is classified by combinations of frequency and polarization of radiated radio waves, a plurality of primary radiators () belonging to the same class is arranged at positions corresponding to vertexes of one of triangles in a repeated triangle pattern TR, and the shape of a main reflector () and the shape and arrangement of the repeated triangle pattern TRare determined such that a direction of a line segment passing through positions corresponding to two vertexes in the triangle is different from a radiation direction of a sidelobe of a radio wave reflected by a main reflector () after having been radiated from a primary radiator () arranged at a position corresponding to the vertexes. 1. An antenna apparatus comprising:a plurality of primary radiators for radiating radio waves; anda main reflector for reflecting the radio waves radiated from the plurality of primary radiators, wherein the plurality of primary radiators is classified by combination of frequency and polarization of the radiated radio waves,a plurality of primary radiators belonging to a same class is arranged, in a repeated triangle pattern in which a triangle is arranged repeatedly, at positions corresponding to vertexes of each triangle, anda shape of the main reflector and a shape and arrangement of the repeated triangle pattern are determined such that a direction of a line segment passing through positions corresponding to two vertexes in the triangle is different from a radiation direction of a sidelobe of a radio wave that is radiated from primary radiators arranged at positions corresponding to the vertexes and is reflected by the main reflector.2. The antenna apparatus according to claim 1 , wherein an aperture shape of the main reflector is a parallelogram claim 1 , andthe repeated triangle pattern includes one or more triangles so as to form a same shape as the aperture shape.3. The antenna apparatus according to claim 1 , wherein an aperture shape of ...

Resonant element of frequency selective surface, frequency selective surface and antenna device

There are provided a plurality of poles whose roots are connected to a central part and whose tips extend in mutually different directions on an identical plane or on an identical curved surface, wherein a pole width at each of the roots is narrower than a pole width between each of the roots and the corresponding one of the tips, and a pole width at each of the tips is narrower that the pole width between each of the roots and the corresponding one of the tips, each pole width being defined by a length of a line segment in a direction perpendicular, on the identical plane or on the identical curved surface, to a line segment connecting each of the roots to a corresponding one of the tips in the respective poles.

MICROWAVE IRRADIATING AND HEATING DEVICE

Disclosed is a microwave irradiating and heating device including: a reaction furnace () for containing a sample material () to be irradiated with microwave and to be heated; a polarization grid () provided for the reaction furnace (); a microwave irradiating source () for emitting a linearly polarized microwave, the microwave irradiating source () being disposed outside the reaction furnace (); and a reflector () for reflecting the microwave emitted from the microwave irradiating source () toward the reaction furnace () through the polarization grid (), the reflector () being disposed above the reaction furnace (), wherein the microwave irradiating source () is arranged in such a way that the polarization direction of the reflected microwave which is made incident upon the polarization grid () is perpendicular to an orientation of the polarization grid (). 1. A microwave irradiating and heating device comprising:a reaction furnace for containing a sample material to be irradiated with microwave and to be heated;a polarization grid provided for the reaction furnace;a microwave irradiating source for emitting a linearly polarized microwave, the microwave irradiating source being disposed outside the reaction furnace; anda reflector for reflecting the microwave emitted from the microwave irradiating source toward the reaction furnace through the polarization grid, the reflector being disposed above the reaction furnace,wherein the microwave irradiating source is arranged in such a way that the polarization direction of the reflected microwave which is made incident upon the polarization grid is perpendicular to an orientation of the polarization grid.2. A microwave irradiating and heating device comprising:a reaction furnace for containing a sample material to be irradiated with microwave and to be heated;a polarization grid provided for the reaction furnace;a plurality of microwave irradiating sources for emitting a linearly polarized microwave, the microwave ...

REFLECTOR ANTENNA DEVICE

A reflector antenna device is configured to include a main reflector that has a rectangular aperture shape , and a primary radiator that radiates a beam having a rectangular shape similar to the aperture shape of the main reflector onto the main reflector . As the primary radiator , a multimode horn antenna, an active phased array antenna, or the like can be used. As a result, the degree of freedom of reflector shaping can be improved without causing reduction in efficiency. 1. A reflector antenna device comprising:a main reflector that has a rectangular aperture shape;a primary radiator that radiates a circle-shaped beam; anda subreflector that converts the shape of the beam radiated by said primary radiator from said circular shape to a rectangular shape similar to the aperture shape of said main reflector and reflects the beam, and that radiates the beam having said rectangular shape onto said main reflector.25-. (canceled)6. The reflector antenna device according to claim 1 , wherein said subreflector is a Cassegrain-type subreflector.7. (canceled)8. The reflector antenna device according to claim 1 , wherein said subreflector is a Gregorian-type subreflector.9. (canceled) The present invention relates to a reflector antenna device used for, for example, satellite communications.As a satellite-mounted shaped beam antenna, a reflector antenna whose aperture shape, in which asperities are formed on a mirror surface, is a circular shape is generally used in order to make it possible to transmit and receive a beam according to a requested service area.For recent satellite-mounted shaped beam antennas, there is an increasing demand for improvements in the gain, suppression of the isolation, etc. than ever before.As a measure to meet this demand, for example, there can be provided a method of improving the degree of freedom for forming asperities on the mirror surface, and enlarging the circular aperture shape which the main reflector has.However, because the size of ...

MICROWAVE IRRADIATING AND HEATING DEVICE

A microwave irradiating and heating device including: a reaction furnace containing a sample material to be irradiated with a microwave passed through an opening and to be heated; a microwave irradiating source disposed outside the reaction furnace; a rotated quadric surface mirror reflecting microwave emitted from the microwave irradiating source toward the opening, and disposed above the reaction furnace; a lid for the opening, at least a portion of the lid made from dielectric to transmit microwave reflected on the rotated quadric surface mirror into the reaction furnace; wherein an angle of incidence of the microwave, reflected on the rotated quadric surface mirror and irradiated at the portion of the lid made from the dielectric, is at an angle causing a polarized wave of the microwave to pass through the portion. 1. A microwave irradiating and heating device comprising:a reaction furnace having an opening and for containing a sample material to be irradiated with a microwave passed through the opening and to be heated;a microwave irradiating source for emitting the microwave, the microwave irradiating source being disposed outside the reaction furnace;a spheroidal mirror for reflecting the microwave emitted from the microwave irradiating source toward the opening of the reaction furnace, the spheroidal mirror being disposed above the reaction furnace;a lid provided for the opening of the reaction furnace, at least a portion of the lid to which the microwave is irradiated being made from dielectric to transmit the microwave reflected on the spheroidal mirror into the reaction furnace; anda rugged portion for reflecting irregularly the microwave, the rugged portion being provided on a surface, among formed surfaces of the lid, facing the interior space of the reaction furnace in an area other than the portion to which the microwave is irradiated, whereinthe microwave irradiating source and the spheroidal mirror are disposed so that an angle of incidence of the ...

Microwave heating device

What is provided here are: a radiation element provided at one of walls of a heating chamber, for radiating a microwave into the heating chamber; at least one hollow dielectric member in which a gas is sealed, the hollow dielectric member having electrodes at both end portions thereof; and a control unit having a plasma control unit for controlling the state of the hollow dielectric member and a current adjustment unit for adjusting a current to be applied to the electrodes of the hollow dielectric member, under the control of the plasma control unit, the current adjustment unit being connected to the electrodes; wherein the at least one hollow dielectric member is provided along one of the walls which is other than the wall at which the radiation element is provided; and wherein the plasma control unit controls the state of the hollow dielectric member so that it is put into one of states of: a plasma state in which the microwave is reflected by the gas; a plasma state in which the microwave is absorbed by the gas; and a gas state in which the microwave is allowed to be transmitted through the gas.

Antenna device

An antenna device includes a beamforming circuit ( 3 ) that forms a radio wave in a first frequency band, including two polarized waves orthogonal to each other, and outputs the radio wave in the first frequency band, a beamforming circuit ( 6 ) that receives the radio wave in the first frequency band output from the beamforming circuit ( 3 ), and outputs a the radio wave in the first frequency band, and forms a radio wave in a second frequency band, including two polarized waves orthogonal to each other, and outputs the radio wave in the second frequency band, and primary radiators ( 7 ) that emit a beam in the first frequency band in response to the radio wave in the first frequency band output from the beamforming circuit ( 6 ), and emit a beam in the second frequency band in response to the radio wave in the second frequency band output from the beamforming circuit ( 6 ).

Reflection mirror antenna device

A first region of a reflection mirror including a center point of the paraboloid of revolution is formed of a conductor. A second region, which is an outer peripheral side of the first region, of the reflection mirror is a region where a plurality of reflection elements, which are conductor patterns, is arranged on a dielectric body overlaid on a base plate conductor. An arrangement pitch of the plurality of reflection elements corresponds to a wavelength of a radio wave in the second frequency band.

Radar device

Included are: a radar main unit for emitting a radar wave and receiving a reflection wave of the radar wave reflected by an object; and a dielectric substrate in which multiple matching layers each having a protruded shape are regularly arranged on one surface of the dielectric substrate, and the radar wave emitted from the radar main unit enters the multiple matching layers in a state where the other-surface side of the dielectric substrate is attached to a windshield.

Antenna device

Microwave heating device

A radiation element for radiating a microwave into the heating chamber at least one hollow dielectric member in which a gas is sealed, the hollow dielectric member having electrodes and a control unit having a plasma control unit for controlling the state of the hollow dielectric member and a current adjustment unit for adjusting a current to be applied to the electrodes of the hollow dielectric member under the control of the plasma control unit, the current adjustment unit being connected to the electrodes; and wherein the plasma control unit controls the state of the hollow dielectric member to put into one of states of: a plasma state in which the microwave is reflected by the gas; a plasma state in which the microwave is absorbed by the gas; and a gas state in which the microwave is allowed to be transmitted through the gas.

Resonant element for frequency selective plate, frequency selective plate and antenna device

Antenna device

An antenna and a radome that covers the antenna are provided, the radome includes a first part, a second part, and a third part each with a surface which is flush to each other, the first part has a beam transmission characteristic corresponding to a scanning angle of 0 degrees of a beam emitted by the antenna with an emission direction directed toward the first part, the second part has a beam transmission characteristic corresponding to a first scanning angle of a beam emitted by the antenna with an emission direction directed toward the second part, and the third part has a beam transmission characteristic corresponding to a second scanning angle of a beam emitted by the antenna with an emission direction directed toward the third part.

Microwave heating device

What is provided here are: a radiation element (3) provided at one of walls of a heating chamber (1), for radiating a microwave into the heating chamber (1); at least one hollow dielectric member (4) in which a gas (41) is sealed, the hollow dielectric member (4) having electrodes (42) at both end portions thereof; and a control unit (100) having a plasma control unit (101) for controlling the state of the hollow dielectric member (4) and a current adjustment unit (102) for adjusting a current to be applied to the electrodes (42) of the hollow dielectric member (4), under the control of the plasma control unit (101), the current adjustment unit (102) being connected to the electrodes (42); wherein the at least one hollow dielectric member (4) is provided along one of the walls which is other than the wall at which the radiation element (3) is provided; and wherein the plasma control unit (101) controls the state of the hollow dielectric member (4) so that it is put into one of states of: a plasma state in which the microwave is reflected by the gas; a plasma state in which the microwave is absorbed by the gas; and a gas state in which the microwave is allowed to be transmitted through the gas.

Reflector antenna device

Reflection mirror antenna device

Reflector antenna device

A reflector antenna device (100, 100a, 100b) includes: a primary radiator (110, 110b) to radiate a first radio wave in a first frequency band and a second radio wave in a second frequency band lower in frequency than the first frequency band; and a reflector (120, 120a, 120b) having a reflection face reflecting the first radio wave and the second radio wave radiated by the primary radiator (110, 110b), in which the reflection face of the reflector (120, 120a, 120b) has a first region (121) including a center point of the reflection face and a second region (122, 122b1) that is an outer peripheral region of the first region (121) and is provided with a plurality of recesses (123, 123b1), and each of the plurality of recesses (123, 123b1) is configured to allow entrance of the first radio wave, restrict entrance of the second radio wave, and reflect the first radio wave having entered the recess (123, 123b1) on a bottom face (125, 125b1) of the recess (123, 123b1).

Reflector antenna device

A reflector antenna device includes: a primary radiator to radiate a first radio wave in a first frequency band and a second radio wave in a second frequency band lower in frequency than the first frequency band; and a reflector having a reflection face reflecting the first radio wave and the second radio wave radiated by the primary radiator, in which the reflection face of the reflector has a first region including a center point of the reflection face and a second region that is an outer peripheral region of the first region and is provided with a plurality of recesses, and each of the plurality of recesses is configured to allow entrance of the first radio wave, restrict entrance of the second radio wave, and reflect the first radio wave having entered the recess on a bottom face of the recess.

Reflector antenna device

Reflector antenna apparatus

A reflector antenna apparatus includes: a radiator that emits a radio wave; a reflector that reflects the radio wave emitted from the radiator, a shape of the reflector being changeable; a support structure supporting the reflector, the support structure being connected to at least a part of an outer periphery of the reflector and including at least two flexible support members capable of following a change in the shape of the reflector; an injection device that injects a fluid into the at least two support members; and a coupling that couples the reflector and the at least two support members. In a deployed state in which the at least two support members are filled with the fluid, the reflector is configured to form a curved surface shape in which the reflector is not curved in a first direction and is curved in a second direction orthogonal to the first direction.

Microwave irradiating and heating device

Disclosed is a microwave irradiating and heating device including a reaction furnace ( 1 ) for containing a sample material to be irradiated with microwave and to be heated, a lid ( 2 ) provided for the reaction furnace ( 1 ) and having a single hole ( 21 ), a microwave irradiating source ( 3 ) for emitting a microwave, the microwave irradiating source ( 3 ) being disposed outside the reaction furnace, and a rotated quadric surface mirror ( 4 ) for reflecting the microwave emitted from the microwave irradiating source ( 3 ) into the reaction furnace ( 1 ) through the hole ( 21 ) of the lid ( 2 ), the rotated quadric surface mirror ( 4 ) being disposed above the reaction furnace ( 1 ).

Microwave irradiating and heating device

A microwave irradiating and heating device including a reaction furnace for containing a sample material to be irradiated with microwave and to be heated, a lid provided for the reaction furnace and having a single hole, a microwave irradiating source for emitting a microwave, the microwave irradiating source being disposed outside the reaction furnace, and a rotated quadric surface mirror for reflecting the microwave emitted from the microwave irradiating source into the reaction furnace through the hole of the lid, the rotated quadric surface mirror being disposed above the reaction furnace.

Microwave irradiating and heating device

Disclosed is a microwave irradiating and heating device including: a reaction furnace ( 1 ) for containing a sample material ( 50 ) to be irradiated with microwave and to be heated; a polarization grid ( 2 ) provided for the reaction furnace ( 1 ); a microwave irradiating source ( 3 ) for emitting a linearly polarized microwave, the microwave irradiating source ( 3 ) being disposed outside the reaction furnace ( 1 ); and a reflector ( 4 ) for reflecting the microwave emitted from the microwave irradiating source ( 3 ) toward the reaction furnace ( 1 ) through the polarization grid ( 2 ), the reflector ( 4 ) being disposed above the reaction furnace ( 1 ), wherein the microwave irradiating source ( 3 ) is arranged in such a way that the polarization direction of the reflected microwave which is made incident upon the polarization grid ( 2 ) is perpendicular to an orientation of the polarization grid ( 2 ).

Reflector antenna device

A reflector antenna device is configured to include a main reflector 1 that has a rectangular aperture shape 2 , and a primary radiator 3 that radiates a beam having a rectangular shape similar to the aperture shape 2 of the main reflector 1 onto the main reflector 1 . As the primary radiator 3 , a multimode horn antenna, an active phased array antenna, or the like can be used. As a result, the degree of freedom of reflector shaping can be improved without causing reduction in efficiency.