摘要:
A planar antenna including slot arrays configured to set a narrow interval between elements so as to perform beam scanning in a wide angle range while keeping low loss and low profile. The planar antenna includes: a coaxial line including an inner conductor, an outer conductor provided so as to surround a circumference of the inner conductor, and both ends short-circuited; a feeding mechanism for exciting the coaxial line; and a plurality of slots formed on the outer conductor with a certain angle with respect to a tube direction of the coaxial line and having approximately a resonance length.
摘要:
To suppress a standing wave ratio within a waveguide to a lower value, and suppresses a grating lobe, the present invention provides a waveguide slot array antenna device, including a plurality of rectangular slots (2, 3) that are inclined by a given angle with respect to an axis of a rectangular waveguide (1) and are arranged on a wide surface of the rectangular waveguide (1) alternately at opposite positions with respect to a center line that extends along the axial direction of the wide surface of the rectangular waveguide at intervals of ½ wavelength in the waveguide, respectively, in which the respective slots on the same side with respect to the center line are identical with each other in length, width, and distance from the center line, and the slots on opposite sides with respect to the center line are different from each other in at least any one of the length, the width, and the distance from the center line.
摘要:
An object of the present invention is to provide a variable power distributor capable of calculating an error between transmission lines of two systems after building a variable power distributor and correcting the set value of the amplitude and the phase according to the error, an error detection method for the variable power distributor, and a set value correction method. The variable power distributor includes: a two-way distributor provided on an input side of a set of transmission lines consisting of a first and a second transmission line; a 90-degree hybrid circuit provided on an output side of the set of transmission lines; and a variable phase shifter, variable resistance attenuator, and a power amplifier which are provided on each of the set of the transmission lines between the two-way distributor and the 90-degree hybrid circuit. The variable power distributor further includes error detection means for monitoring an output signal from the 90-degree hybrid circuit and detecting an error existing in each component between the first and the second transmission lines based on the monitor output.
摘要:
A planar antenna including slot arrays configured to set a narrow interval between elements so as to perform beam scanning in a wide angle range while keeping low loss and low profile. The planar antenna includes: a coaxial line including an inner conductor, an outer conductor provided so as to surround a circumference of the inner conductor, and both ends short-circuited; a feeding mechanism for exciting the coaxial line; and a plurality of slots formed on the outer conductor with a certain angle with respect to a tube direction of the coaxial line and having approximately a resonance length.
摘要:
A variable power distributor capable of calculating an error between transmission lines of two systems after building a variable power distributor and correcting the set value of the amplitude and the phase according to the error, an error detection method for the variable power distributor, and a set value correction method is provided. The variable power distributor includes: a two-way distributor provided on an input side of a set of transmission lines consisting of a first and a second transmission line; a 90-degree hybrid circuit provided on an output side of the set of transmission lines; and a variable phase shifter, variable resistance attenuator, and a power amplifier provided on each line of the set of transmission lines between the two-way distributor and the 90-degree hybrid circuit. The variable power distributor further includes an error detection unit that monitors an output signal from the 90-degree hybrid circuit and detects an error existing in each component between the first and the second transmission lines based on the monitor output.
摘要:
A two-frequency antenna includes feeders 7a and 7b, inner radiation elements 2a and 2b connected to the feeders, outer radiation elements 3a and 3b, and inductors 4a and 4b that are formed in gaps 6a and 6b between the inner radiation elements and the outer radiation elements to connect the two radiation elements, which are printed on the first surface and on the second surface of the dielectric board 1, respectively.
摘要:
A switch circuit including: a plurality of MEMS switches connected in parallel or in series, which have different drive voltages; and a single voltage supply for driving the plurality of MEMS switches by the plurality of drive voltages, is used for a microwave circuit or an antenna circuit, to vary a configuration of the microwave circuit or the antenna circuit based on the drive voltage value. That is, the configuration of the microwave circuit or the antenna circuit can be varied based on the drive voltage value by using the switch circuit including the MEMS switches having the different drive voltages for the microwave circuit or the antenna circuit.
摘要:
An array antenna includes systematically arranged linear antennas belonging to two or more groups consisting of linear antennas operating at respective frequencies, so that the array antenna can operate at two or more operating frequencies. Each linear antenna that operates at a relatively low frequency includes antenna elements having cranks formed thereon.
摘要:
A light scanning device comprising a source of a parallel light beam. The parallel light beam is passed through a first liquid crystal shutter and a first lens to converge at a focal point thereof. A rectangular light reflecting box with inside reflecting surfaces is arranged next to the first lens, so that a portion of the light beam passing through the first lens is able to directly pass through the light reflecting box and another portion of the light beam is reflected at the reflecting surfaces and then able to pass through light reflecting box, whereby multiple light paths are obtained. The passage of the multiple light paths is controlled by a second liquid crystal shutter located on the end of the rectangular light reflecting box, the second liquid crystal shutter having a plurality of selectively controllable light permeable regions. The light beam is finally impinged on a desired light recording media, and thus it is possible to scan the light recording media by controlling the second liquid crystal shutter to allow a portion of light beam of a selected light path to form a spot of light on the media.