Tsinghua University

Silicon Integrated Systems Corporation

Industrial Technology Research Institute

Chung Shan Institute of Science and Technology

Armaments, Bureau, Ministry of National Defense

Tsun-Hsu Chang

Ching-Fang Yu

Hsein-Wen Chao

Nai-Ching Chen

Yan-Ren Chen

Wei-Syuan Wong

Hsien-Wen Chao

Ching-Pin Yuan

Tsung-Shune Chin

Chun-Cheng Chen

Bo-Hung Lin

Syh-Yuh Cheng

Chwung-Shan Kou

Kwo Ray Chu

Bo-Ren Yu

Chao-Ta Fan

Larry Roger Barnett

Hung-I Chang

Wei-Yuan Chiang

Ling-Chieh Tai

Shih-Chieh Fong

Huan-Jun Guo

Cheng-Hsuan Chan

Po-Yen Chiu

Chun-Tan Wu

Yu-Tzu Chang

Chung-Chun Huang

Hung-Chun Hsu

Chi-Wen Hu

A material processing apparatus is disclosed. This material processing apparatus is particularly developed to utilize a quasi-traveling microwave to conduct heat treatment for a thread-type article like fiber, silk, artificial fiber, and artificial silk. The material processing apparatus comprises a primary waveguide tube, a microwave blocking plate, a secondary waveguide tube, and at least one microwave absorbing member disposed of in the primary waveguide tube. By such design, a microwave source supplies a microwave to the secondary waveguide tube and the primary waveguide tube, such that the microwave travels in the two waveguide tubes so as to become a quasi-traveling microwave. Therefore, in the case of a thread-type article being be fed into the primary waveguide tube via the secondary waveguide tube by a thread-type article transferring mechanism, the thread-type article is steadily and evenly heated by the quasi-traveling microwave in the two waveguide tubes.

Material processing apparatus using quasi-traveling microwave to conduct heat treatment

Disclosures of the present invention describe a coaxial microwave rotary applicator for material processing, mainly comprising: a waveguide unit, a microwave generator connected to one end of the waveguide unit, a bearing unit, a chamber, a rotary shaft, a driver unit, a sampling unit. The bearing unit is connected to the waveguide unit through a non-rotary ring, and the chamber is connected to a rotary ring of the bearing unit, and the microwave generator is configured for supplying a microwave to the chamber. By such arrangements, it is able to uniformly heat a specific material disposed in the chamber by driving the chamber to rotate. It is worth noting that, a user is allowed to clearly observe the processing progress via the sampling unit during the heating process of the specific material.

Coaxial microwave rotary applicator for material processing

A measuring apparatus for electromagnetic property of material includes a chamber and a specified shielding piece. The chamber has a cavity inside and the chamber has an electromagnetic wave access terminal to connect to the cavity, used to receive an input electromagnetic wave and output a reflective electromagnetic wave. The specified shielding piece is disposed inside the cavity with respect to the electromagnetic wave access terminal, used to produce a region in side the cavity. The region is dominated by magnetic field and is used to adapt an object to be measured.

Measuring apparatus for electromagnetic property of material and measuring method thereof

A system for measuring a permittivity includes a resonant chamber, a conductive probe, a platform, a pillar, a detector, and a computing module. The resonant chamber has a cavity. The conductive probe is configured for introducing a microwave into the cavity of the resonant chamber. The platform is configured for carrying a sample. The pillar is positioned between the platform and a chamber wall, so that the platform protrudes from the chamber wall. The detector is used to detect a resonant frequency of the microwave when resonance occurs within the cavity. The computing module is configured for calculating a permittivity corresponding to the measured resonant frequency according to a corresponding relationship between resonant frequency and permittivity. The above-mentioned system for measuring a permittivity is capable of measuring a broader range of permittivity with simplified measurement steps and higher accuracy. A method for measuring a permittivity is also disclosed.

System and method for measuring permittivity

A multi-channel mode converter operating with a series of TE or TM mode electromagnetic wave includes a plurality of coaxial waveguides arranged in overlay configuration. By controlling radius ratio and the number of coupling aperture of each coaxial waveguide, high power and high purity of operating mode of electromagnetic wave can be obtained and the major parasitic mode of electromagnetic wave can be suppressed, so as to avoid crosstalk between coaxial waveguides. A rotary joint including the above-mentioned mode converter with multi-channel is also disclosed.

Multi-channel mode converter and rotary joint operating with a series of TE or TM mode electromagnetic wave

A multi-slot resonant microwave device comprises a plurality of slot microwave resonator units and at least one microwave emitting source. Each of the plurality of slot microwave resonator unit is defined as a slot resonant cavity. Whenever at least one of the microwave emitting sources emits microwave power into the plurality of slot microwave resonator units, the plurality of slot microwave resonator units resonate simultaneously, and produce an electromagnetic field with the same polarization direction. Therefore, the multi-slot resonator device can deal with large-area microwave heating with greater microwave effect to shorten operating time and accomplish the objective of homogeneous and megathermal microwave heating.

Multi-slot microwave device and processing system thereof

A microwave diffraction system includes two plates, a lattice model, a transmitter and a detector. The two plates are electrically conductive and configured in a parallel manner so as to form a planar waveguide. The lattice model includes a plurality of cylinders arranged in regular order and is placed between the two plates. The transmitter is arranged at an outside edge of the planar waveguide and configured for providing a microwave towards the lattice model. The detector is arranged at outside edge of the planar waveguide and configured for detecting the microwave reflected from the lattice model. The diffraction pattern obtained by the above-mentioned microwave diffraction system is similar to theoretical value.

Microwave diffraction system

A mode-selective interactive structure for gyrotrons includes a plurality of metal tubes, wherein an inner wall of each metal tube forms a waveguide; and between each adjacent pair of the metal tubes exists a slice with a first interface and a second interface and when an electromagnetic wave comprising an operating mode and a competing mode propagates through the slice, the competing mode is partially reflected upon, partially transmitted through and/or absorbed at the first interface and the second interface of the slice so that the power loss of the competing mode is larger than the operating mode and the production of the competing modes is suppressed progressively thereby achieving mode selection.

Mode-selective interactive structure for gyrotrons

An isolated dual-mode converter includes a TEmode converter including a circular waveguide, and a plurality of rectangular waveguides connected to the circumference of the circular waveguide; and a TMmode converter including a coaxial waveguide, formed by coaxial outer and inner conductors, and the circular waveguide connected and aligned axially with the coaxial waveguide, wherein a symmetrical axis of an opening at the end of the rectangular waveguides connected to the circular waveguide is parallel to the axis of the circular waveguide, thereby avoiding interfering with the propagation of TMmode. In an application, the isolated dual-mode converter outputs TEmode and TMmode at the same port, thereby achieving more uniform microwave heating. In another application, two isolated dual-mode converters are aligned face-to-face, forming a dual-channel joint with high channel isolation and low transmission loss, which may be used for a rotary joint of a radar system.

Isolated dual-mode converter and applications thereof

The invention discloses a microwave supplying apparatus including a microwave generator, a first power divider, a second power divider, a first waveguide, and a second wave guide. The first waveguide is connected to the microwave generator and has a first output terminal and a second output terminal to divide a microwave generated by the microwave generator along a first direction. The second power divider is connected to the first output terminal and has a third output terminal and a fourth output terminal to divide the microwave along a second direction. The first waveguide and the second waveguide are connected to the third output terminal and the fourth terminal respectively and receive the microwave through the first power divider and the second power divider to respectively output the microwave fields with approximate intensity distributions.

Microwave supplying apparatus and microwave plasma system

A microwave rotary joint comprises a mode converter for converting microwave signals of a TEcircular symmetric mode, and the mode converter comprises: two circular waveguides, one end of each of the waveguides has a circular input/output port; and two power dividing structures, each of the power dividing structure has an input/output port and four connecting ports, the four connecting ports are separated and surround each of the circular waveguides and connected to the inside of each of the circular waveguides, the two circular waveguides are integrated as one member through rotating a bearing.

Mode converter and microwave rotary joint with the mode converter

The a polarized high-order mode electromagnetic wave converter and its coupling method, uses bifurcate structure to divide the input wave into two signals with the same amplitude but opposition phases, which are then inputted into a circular main waveguide through waveguide so that the input wave could convert into linearly polarized high-order mode in the main waveguide, and then undergo the polarization change conversion stage to convert the polarized wave into circularly polarized wave. The coupling method includes the electromagnetic wave bifurcate stage, mode conversion stage, and may combine with a polarization conversion stage. The TE21 coupler is tested with simulation computation and fabricated, and proved to product consistent results with the computer simulation. The coupler has features of high conversion efficiency, high mode purity, wide bandwidth, polarity control, and convenience in processing.

Polarized high-order mode electromagnetic wave coupler and its coupling method

A quasi-optical material treatment apparatus includes a first mirror and a second mirror. The first mirror is arched, and has a focal point in a chamber distance, and a coupling port to receive a high power microwave from an external microwave source that travels along the chamber distance to output a strong field microwave beam. The second mirror and the first mirror jointly form a quasi-optical action chamber and are movable relative to each other to adjust the total chamber distance between the two. A material to be treated may be moved through a focusing zone (about one wavelength of the strong field microwave beam) of the strong field microwave beam to be treated rapidly and evenly.

Quasi-optical material treatment apparatus

The high order mode electromagnetic wave coupler and coupling method uses one or more Y-shaped bifurcated waveguides to divide the wave to one or more order, so as to divide the target electromagnetic wave proportionally into equal shares. The waveguide is used to inject the electromagnetic wave to a main waveguide, so that the electromagnetic wave is converted into high order mode in the main waveguide. For example, a rectangular waveguide TEmode can be converted to a circular TEmode, wherein this conversion can also be applied to higher order modes and microwave guide-shaped modes. The coupling method includes a electromagnetic wave power dividing section and mode converting section, of which the power divider and dividing method can divide the electromagnetic wave proportionally. The coupler and coupling method feature high converting efficiency, high mode purity, high bandwidth, and convenient operation.

High order mode electromagnetic wave coupler and coupling method using proportional distributing waves

Voltage fluctuations, especially due to a resonant effect of a power distribution system, result in serious timing skews in a high-speed digital system. Adding extra resistive loadings for coupling out the noise into external terminations will reduce a quality factor of the power distribution system, which will effectively minimize the noise accumulation. The external coupled resistive terminators are preferably formed on positions of a microstrip resonator where relatively high noise fluctuations occur. Each of the external coupled resistive terminators may be formed of a resistor, a transmission line with a resistor at one end, a lossy transmission line with an open circuit at one end, or a quarter-wavelength lossy transmission line. Simulation results indicate that the maximum voltage fluctuations are suppressed from 750 mV to 150 mV at a resonant frequency and about 50% for an overall range of the operating frequencies.

Growing community of inventors

Hsinchu, Taiwan

Tsun-Hsu Chang