Abstract: The system includes a plurality of probe antennas that receive radio signals at a plurality of measurement positions located within a measurement plane in a near field region of an antenna to be measured, a probe scanning mechanism that moves the respective probe antennas to a plurality of measurement positions while maintaining relative positions of the plurality of probe antennas, an amplitude and phase difference measurement unit that measures a phase difference between the radio signals and measures amplitudes of the radio signals, every time the respective probe antennas are moved to the measurement positions, and a phase calculation unit that calculates a phase of the radio signal at each measurement position from the phase difference measured by the amplitude and phase difference measurement unit.

Abstract: The system includes a plurality of probe antennas that receive radio signals at a plurality of measurement positions located within a measurement plane in a near field region of an antenna to be measured, a probe scanning mechanism that moves the respective probe antennas to a plurality of measurement positions while maintaining relative positions of the plurality of probe antennas, an amplitude and phase difference measurement unit that measures a phase difference between the radio signals and measures amplitudes of the radio signals, every time the respective probe antennas are moved to the measurement positions, and a phase calculation unit that calculates a phase of the radio signal at each measurement position from the phase difference measured by the amplitude and phase difference measurement unit.

Abstract: In a method of measuring a radiation power generated from a DUT from an output of a measurement antenna, wherein the DUT is arranged in an ellipsoid enclosed space such that a radiation center of the radio wave is substantially coincided with the neighborhood of a first focal point. The radio wave radiated from the DUT and reflected from the wall surface is received by a receiving antenna arranged in the neighborhood a second focal point thereby to measure the total radiated power of the DUT from the output signal of the receiving antenna. One of the DUT and the receiving antenna is moved along the axis passing through the first and second focal points, and based on the measurement value maximizing the output signal power of the receiving antenna, calculating the total radiated power of the DUT.

Abstract: In a method for measuring a radiation power, an elliptical mirror is prepared so as to have a elliptical spherical space enclosed by a metal wall surface, the space having a rotating axis passing through two focal points. A device under test is placed in a position of one of the two focal points such that a center of radiation of a radio wave substantially coincides with the focal point, and a receiving antenna is placed in an position of an other one of the two focal points. The device under test is caused to radiate a radio wave and the radiated radio wave is reflected at the wall surface to allow the receiving antenna to receive the radio wave. Then, total radiation power of the radio wave is measured at a measurement end of the receiving antenna in accordance with an output signal from the receiving antenna.

Abstract: In a method of measuring a radiation power generated from a DUT from an output of a measurement antenna, wherein the DUT is arranged in an ellipsoid enclosed space such that a radiation center of the radio wave is substantially coincided with the neighborhood of a first focal point. The radio wave radiated from the DUT and reflected from the wall surface is received by a receiving antenna arranged in the neighborhood a second focal point thereby to measure the total radiated power of the DUT from the output signal of the receiving antenna. One of the DUT and the receiving antenna is moved along the axis passing through the first and second focal points, and based on the measurement value maximizing the output signal power of the receiving antenna, calculating the total radiated power of the DUT.

Abstract: In a method for measuring a radiation power, an elliptical mirror is prepared so as to have a elliptical spherical space enclosed by a metal wall surface, the space having a rotating axis passing through two focal points. A device under test is placed in a position of one of the two focal points such that a center of radiation of a radio wave substantially coincides with the focal point, and a receiving antenna is placed in an position of an other one of the two focal points. The device under test is caused to radiate a radio wave and the radiated radio wave is reflected at the wall surface to allow the receiving antenna to receive the radio wave. Then, total radiation power of the radio wave is measured at a measurement end of the receiving antenna in accordance with an output signal from the receiving antenna.

Abstract: A circularly polarized antenna has a dielectric substrate, a ground conductor piled up on one surface side of the dielectric substrate, a circularly polarized antenna element formed on an opposite surface of the dielectric substrate, a plurality of metal posts whose respective one end sides are connected to the ground conductor and penetrate the dielectric substrate along a thickness direction thereof, and whose respective other sides extend up to the opposite surface of the dielectric substrate, the plurality of metal posts configuring a cavity by being provided at predetermined intervals so as to surround the antenna element, and a conducting rim which short-circuits the respective other end sides of the plurality of metal posts along an array direction thereof, and is provided so as to extend by a predetermined distance in a direction of the antenna element at the side of the opposite surface of the dielectric substrate.

Abstract: A linearly polarized antenna includes a dielectric substrate, a ground conductor which is overlapped on one surface of the dielectric substrate, an antenna element made of linearly polarized, which is formed on an opposite surface of the dielectric substrate, a plurality of metal posts in which one end side of each of the plurality of metal posts is connected to the ground conductor, the plurality of metal posts piercing through the dielectric substrate along a thickness direction thereof, another end side of each of the plurality of metal posts being extended to the opposite surface of the dielectric substrate, the plurality of metal posts being provided at predetermined intervals to form a cavity so as to surround the antenna element, and a conducting arm which short-circuits the other end of the plurality of metal posts along a line direction of the plurality of metal posts on the opposite surface side of the dielectric substrate, the conducting arm being provided while extended by a predetermined distance

Abstract: A dielectric leakage wave antenna in which both transmission characteristics of a dielectric image line for a radiating section and those of a microstrip line for an exciting section are satisfied while enhancing efficiency by such an arrangement as a dielectric substrate has a lower layer portion and an upper layer portion bonded onto the lower layer portion. A ground plate conductor forming the dielectric image line for making an electromagnetic wave propagate through the dielectric substrate direction in a direction intersecting its thickness direction perpendicularly is formed, as one surface side of the dielectric substrate, on the lower surface of the lower layer. A plurality of leakage metal strips provided in parallel at a predetermined interval on the opposite side of the dielectric substrate are formed on the upper surface of the upper layer of the dielectric substrate.

Abstract: A circularly polarized antenna has a dielectric substrate, a ground conductor which is piled up one surface side of the dielectric substrate, a circularly polarized type of antenna element formed on an opposite surface of the dielectric substrate, a plurality of metal posts whose respective one end sides are connected to the ground conductor and penetrate the dielectric substrate along a thickness direction thereof, and whose respective other sides extend up to the opposite surface of the dielectric substrate, the plurality of metal posts configuring a cavity by being provided at predetermined intervals so as to surround the antenna element, and a conducting rim which short-circuits the respective other end sides of the plurality of metal posts along an array direction thereof, and is provided so as to extend by a predetermined distance in a direction of the antenna element at the side of the opposite surface of the dielectric substrate.

Abstract: A linearly polarized antenna includes a dielectric substrate, a ground conductor which is overlapped on one surface of the dielectric substrate, an antenna element made of linearly polarized, which is formed on an opposite surface of the dielectric substrate, a plurality of metal posts in which one end side of each of the plurality of metal posts is connected to the ground conductor, the plurality of metal posts piercing through the dielectric substrate along a thickness direction thereof, another end side of each of the plurality of metal posts being extended to the opposite surface of the dielectric substrate, the plurality of metal posts being provided at predetermined intervals to form a cavity so as to surround the antenna element, and a conducting rim which short-circuits the other end side of each of the plurality of metal posts along a line direction of the plurality of metal posts on the opposite surface side of the dielectric substrate, the conducting rim being provided while extended by a predeterm