10 results about "Submillimeter wave" patented technology

The invention discloses a frequency duplex synthesis method for realizing a terahertz ultra-wideband frequency multiplier, and relates to the technical field of submillimeter wave / terahertz solid-state frequency multipliers, a'frequency division-frequency multiplication-frequency combination 'duplex circuit architecture is adopted, a frequency division circuit and a frequency combination circuit are both based on a hybrid network type waveguide duplexer design, and the frequency division-frequency multiplication-frequency combination duplex circuit design is adopted. The frequency multiplier circuit is realized by adopting a hybrid integrated frequency doubler, the cost is low, the cavity structure is completely processed by adopting a CNC milling process, and the solid-state characteristic is realized; therefore, under the condition that the frequency doubling / frequency conversion efficiency is not reduced, the frequency doubler capable of covering the full frequency band of 170-260GHz (WR-4 frequency band) can be realized, namely, the double advantages of wide frequency band and high efficiency of the frequency doubler are considered, and the technical problem that the wide frequency band and the high efficiency of a submillimeter wave / terahertz schottky frequency doubler at the present stage cannot be achieved at the same time is solved.

The application relates to the technical field of microwave remote sensing, in particular to a star-borne millimeter wave and sub-millimeter wave detector brightness temperature calibration heat source, which comprises a metal shell, a radiation matrix, temperature measuring resistors, a heater, a heat insulation ring, a cover plate and an electric connector, wherein the radiation matrix is arranged above the inside of the metal shell; the temperature measuring resistors are multiple, and the multiple temperature measuring resistors are arranged in the inside of the radiation matrix; the heater is pasted on the back of the radiation matrix; the cover plate is fixed on the bottom of the metal shell; the heat insulation ring is arranged in the inside of the metal shell and located between the heater and the cover plate; the electric connector is a low-frequency electric connector and is arranged on the outer wall of the metal shell and electrically connected with the temperature measuring resistors and the heater. On the basis of meeting the anti-electromagnetic interference, the application effectively reduces the influence of the heat leakage caused by the heat transfer between the radiation matrix and the shell on the radiation surface temperature uniformity, and greatly improves the radiation surface uniformity.

A pair of first members each have an electrically conductive surface and a disposed to face each other. A plurality of second members each made of an electrically conductive material are disposed between the pair of first members. The plurality of second members are arranged in a periodic pattern in at least one direction parallel to the conductive surface and disposed between the pair of first members. A dielectric member is disposed between each of the plurality of second members and each of the pair of first members. The dielectric member is in contact with the plurality of second members and with the pair of first members. An electronic component is provided that is configured to control propagation of radio waves such as microwaves, millimeter waves, or sub-millimeter waves, and that allows for reduced deflection of the conductive surface.

An endoscope system (1) includes an endoscope (2) having an insertion section (21) inserted into a subject; a distance measuring unit (4) that measures a distance to an object by transmitting and receiving millimeter waves or submillimeter waves; and a flexible waveguide (5) that is connected to the distance measuring unit (4) at one end and has the other end exposed to the outside from a distal end of the insertion section (21), the flexible waveguide (5) propagating the millimeter waves or submillimeter waves transmitted and received by the distance measuring unit (4).

The application discloses a kind of array antenna fault diagnosis methods based on no phase information, the method includes: constructing phase error matrix and introducing it into array antenna forward model, obtain the signal model with unknown phase information;Based on the signal model, unknown phase error matrix and array element excitation are solved alternately iterated, and finally reach the purpose of diagnosing fault antenna.This application can accurately diagnose and locate the position of fault array element under the condition of only array antenna amplitude information, reduce the cost such as financial resources, manpower and time required to measure phase information;In addition, for sub-millimeter wave and terahertz band array antenna, there are many restrictions when measuring its phase information, at this time, the antenna diagnosis algorithm based on no phase information has significant advantages.

An electromagnetic wave absorbing sheet that uses silicon carbide powder to impart light weight and high insulation properties and that can obtain an excellent noise attenuation effect in the submillimeter to millimeter wave bands is provided. The electromagnetic wave absorbing sheet of the present disclosure includes a substrate made of organic matter and a powder that is supported in the substrate and has silicon carbide (SiC) as a principal constituent. In X-ray diffraction using Cu-Kα as a radiation source on a surface of the electromagnetic wave absorbing sheet, a value I4H / I6H obtained by dividing a peak intensity I4H derived from 4H—SiC appearing at 2θ=34.4° to 35° by a peak intensity I6H derived from 6H—SiC appearing at 2θ=35° to 36° is a predetermined value or more.

A phased array system comprising an array of antennas outputting or receiving electromagnetic radiation to or from a steerable direction, wherein the electromagnetic radiation is at submillimeter wavelengths. The system further comprises a plurality of waveguides outputting or receiving the signals to or from the antennas, each of the waveguides with individual phase tuning. The waveguides are configured and dimensioned to guide an electromagnetic wave comprising the signals having a frequency in a range of 100 gigahertz (GHz) to 1000 terahertz (THz). The system further comprises means for phase shifting the signal by means of shifting or varying one or more phases of the signals relative to one another so as to vary, steer, or scan a direction of the electromagnetic radiation.

All existing state-of-the-art high resolution millimeter wave imaging systems experience a trade off between image acquisition time and transceiver array complexity. The proposed dual reflector antenna breaks this trade-off by drastically reducing the array formation time while maintaining the relative simplicity that comes with using a single transceiver element. It consists of a dual mode horn feed, a rotating ellipsoidal sub-reflector and a conic main reflector. The rotating sub-reflector creates a virtual phase center that rotates about an axis to produce a synthetic circular array with a diameter of 120λ. The main reflector redirects the beams from each of these virtual phase centers to overlap and illuminate the scene over a wide field of view. The proposed system can reduce the image acquisition time to the order of milliseconds / seconds which makes real-time SAR imaging a practical alternative to MIMO and phased arrays at millimeter-wave and sub-millimeter-wave frequencies.

The utility model discloses an optical monitoring device conforming to submarine cable surface damage, and relates to the submarine cable technology field, the optical monitoring device comprises a mounting ring and a cable main body, the mounting ring is formed by assembling two groups of semi-circular ring supports, and the right side of the outer part of the mounting ring is fixedly connected with submillimeter wave emitters at equal intervals and at uniform circumference. According to the utility model, the connecting blocks on the semicircular supports are inserted into the connecting grooves on the similar semicircular supports, so that the assembly of the mounting ring can be completed, the mounting ring is sleeved on the annular groove outside the cable main body, at the moment, the servo motor is started to drive the winding drum to rotate, and the winding drum can drive the elastic rope to wind; at the moment, the elastic rope pulls the rubber plug to cancel shielding of the water inlet, external water liquid can enter the interior of the movable groove, a positioning rod on one side of the limiting sliding block is pushed to be inserted into a positioning hole in the connecting block, and rapid assembly of the mounting ring is completed.

The submillimeter-level dual-passband filtering transmission line comprises a micro-coaxial outer conductor, a supporting strip, an inner conductor and a switching coaxial transition section, the supporting strip, the inner conductor and the switching coaxial transition section are arranged in the micro-coaxial outer conductor, and the whole submillimeter-level dual-passband filtering transmission line adopts a micro-coaxial inner and outer structure. By designing and optimizing the number, the geometrical shape and the electrical characteristics of the micro-coaxial inner conductors, the filter effects of miniaturization and wide bandwidth are achieved under the submillimeter wave level size, the defect that an existing filter gives consideration to both the size and the performance is overcome, and the filter can serve as a basic transmission line unit to be used for constructing various passive networks or directly feeding an antenna. And the filtering characteristic is realized from a transmission line level instead of a network level. The submillimeter-level dual-passband filtering transmission line has relatively low insertion loss, good out-of-band rejection characteristic and relatively wide passband, and is particularly suitable for filtering application of low-frequency and millimeter-wave high-frequency band signals in a broadband communication system.