• 제목/요약/키워드: High-power microwave

검색결과 329건 처리시간 0.027초

High Output Power and High Fundamental Leakage Suppression Frequency Doubler MMIC for E-Band Transceiver

  • Chang, Dong-Pil;Yom, In-Bok
    • Journal of electromagnetic engineering and science
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    • 제14권4호
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    • pp.342-345
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    • 2014
  • An active frequency doubler monolithic microwave integrated circuit (MMIC) for E-band transceiver applications is presented in this letter. This MMIC has been fabricated in a commercial $0.1-{\mu}m$ GaAs pseudomorphic high electron mobility transistor (pHEMT) process on a 2-mil thick substrate wafer. The fabricated MMIC chip has been measured to have a high output power performance of over 13 dBm with a high fundamental leakage suppression of more than 38 dBc in the frequency range of 71 to 86 GHz under an input signal condition of 10 dBm. A microstrip coupled line is used at the output circuit of the doubler section to implement impedance matching and simultaneously enhance the fundamental leakage suppression. The fabricated chip is has a size of $2.5mm{\times}1.2mm$.

Coherent motion of microwave-induced fluxons in intrinsic Josephson junctions of HgI$_2$-intercalated Bi$_2$Sr$_2$C aCu$_2$O$_{8+x}$ single crystals

  • Kim, Jin-Hee;Doh, Yong-Joo;Chang, Sung-Ho;Lee, Hu-Jong;Chang, Hyun-Sik;Kim, Kyu-Tae;Jang, Eue-Soon;Choy, Jin-Ho
    • 한국초전도학회:학술대회논문집
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    • 한국초전도학회 2000년도 High Temperature Superconductivity Vol.X
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    • pp.65-65
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    • 2000
  • Microwave response of intrinsic Josephson junctions in mesa structure formed on HgI2-intercalated Bi2Sr2CaCu2O8+x single crystals was studied in a wide range of microwave frequency. With irradiation of 73${\sim}$76 GHz microwave, the supercurrent branch becomes resistive above a certain onset microwave power. At low current bias, the current-voltage characteristics show linear behavior, while at high current bias, the resistive branch splits into multiple sub-branches. The voltage spacing between neighboring sub-branches increase with the microwave power and the total number of sub-branches is almost identical to the number of intrinsic Josephson junctions in the mesa. All the experimental results suggest that each sub-branch represents a specific mode of collective motion of Josephson vortices generated by the microwave irradiation. With irradiation of microwave of microwave of frequency lower than 20 GHz, on the other hand, no branch splitting was observed and the current-voltage characteristics exhibited complex behavior at hlgh blas currents. This result can be explained in terms of incoherent motion of Josephson vortices generated by non-uniform microwave irradiation.

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HMIC 기술을 적용한 소형화 경량화 광대역 전력증폭기 개발 (Development of Compact and Lightweight Broadband Power Amplifier with HMIC Technology)

  • 변기식;최진영;박재우
    • 한국산학기술학회논문지
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    • 제19권11호
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    • pp.695-700
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    • 2018
  • 본 논문에서는 고유전율 인쇄회로기판 상의 좁은 면적 내에 패키지(Package) 되지 않은 마이크로파(Microwave) 부품을 고밀도로 집적하는 HMIC (Hybrid Microwave Integrated Circuit) 기술을 적용하여 모듈(Module)의 크기를 소형화, 경량화하고 동시에 근접한 소자 상호간의 전자기적 간섭을 최소화 하는 구조 설계 및 제작 기술을 적용하여 광대역 주파수 범위에서 균일한 전기적 성능을 갖는 광대역 전력증폭기를 개발한 내용을 다루었다. 제작한 광대역 전력 증폭기의 성능을 측정한 결과, 동작 주파수 범위에서 소신호 이득은 32 ~ 36 dB 범위 내에 이득평탄도 ${\pm}1.5dB$를 갖음을 확인하였다. 또한, 출력전력은 동작 주파수 범위에서 30 dBm 이상을 만족하였으며, 잡음 지수는 7 dB 이내로 측정되어 목표규격을 만족하는 특성을 나타내었다. OIP3(Output Third Order Intercept Point)는 39 dBm 이상을 만족함을 확인하였다. 제작한 광대역 전력 증폭기는 전자전 체계의 재밍(Jamming) 발생 장치의 고출력 증폭기를 전기적으로 구동하기 위하여 필요한 목표 성능을 모두 만족함으로써 실제 적용이 가능하며, 향후 마이크로파 대역의 유사 전력 증폭기를 설계하는데 도움이 될 것으로 기대한다.

Simulation Study on Measuring Pulverized Coal Concentration in Power Plant Boiler

  • Chen, Lijun;Wang, Yang;Su, Cheng
    • Journal of Information Processing Systems
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    • 제15권1호
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    • pp.189-202
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    • 2019
  • During thermal power coal-fired boiler operation, it is very important to detect the pulverized coal concentration in the air pipeline for the boiler combustion stability and economic security. Because the current measurement methods used by power plants are often involved with large measurement errors and unable to monitor the pulverized coal concentration in real-time, a new method is needed. In this paper, a new method based on microwave circular waveguide is presented. High Frequency Electromagnetic Simulation (HFSS) software was used to construct a simulation model for measuring pulverized coal concentration in power plant pipeline. Theoretical analysis and simulation experiments were done to find the effective microwave emission frequency, installation angle, the type of antenna probe, antenna installation distance and other important parameters. Finally, field experiment in Jilin Thermal Power Plant proved that with selected parameters, the measuring device accurately reflected the changes in the concentration of pulverized coal.

A CMOS Bridge Rectifier for HF and Microwave RFID Systems

  • Park Kwangmin
    • Transactions on Electrical and Electronic Materials
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    • 제5권6호
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    • pp.237-240
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    • 2004
  • In this paper, a CMOS bridge rectifier for HF and microwave RFID systems is presented. The proposed RFID CMOS bridge rectifier is designed with two NMOSs and two PMOSs whose gates are connected to the antenna, and it is operated as a full wave bridge rectifier. The simulation results obtained with SPICE show the well rectified and high enough DC output voltages for the operating frequencies of 13.56 MHz, 915 MHz, and 2.45 GHz which are used in various RFID systems. The obtained DC output voltages are sufficiently high for driving the low power microchip in RFID transponder for the frequency range of HF and microwave.

종양의 온열치료를 위한 마이크로잔 조사장치의 제작과 응용 (Fabrication of Microwave Applicator for Hyperthermia and Thermal Distribution in Tissues)

  • 추성실;이종태;김귀언
    • Radiation Oncology Journal
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    • 제2권1호
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    • pp.11-20
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    • 1984
  • The renewed interest in the use of hyperthermia in cancer therapy is bases on radiobiological and clinical evidence indicated that there may be a significant therapeutic advantage with the use of heat alone or combined with radiation or chemotherapy, There are many methods for generating heat for localized tumor as like radiofrequency, microwave, electromagnetic induction and ultrasound. But it is very difficult to be even thermal dose distribution and stable output of power and then the detection of temperature in tumor is difficult to be precise with thermocouples and semiconductor sensors. We designed the microwave heating generator, dipole antenna applicators and autometic temperature controlled thermocouples for localized hyperthermia on skin and in cavities. 1. The microwave generator with 120 W, 2,450MHz magnetron could be heating up to $40^{\circ}C\~50^{\circ}C\;for\;1\~2$ hours in living tissues. 2. The thermal dose distribution in tissue with microwave was described $42^{\circ}C\~44^{\circ}C$ with in 3 cm depth and $2\~6cm$ diameter area. 3. Skin surface heating applicator with spiral 3 times wave length antenna radiated high Power of microwave. 4, Intracavitary heating applicator with dipole antenna with autometic control temperature sensor kept up continuously constant temperature in tissue. 5. For constant thermal distribution, applied two steps power with 10W microwave after $17\~20W$ during first 10 minutes. 6. The cooling rate by blood flew in living tissue was rised as $10\%$ then meats.

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Hydrophobic and Mechanical Characteristics of Hydrogenated Amorphous Carbon Films Synthesized by Linear Ar/CH4 Microwave Plasma

  • Han, Moon-Ki;Kim, Taehwan;Cha, Ju-Hong;Kim, Dong-Hyun;Lee, Hae June;Lee, Ho-Jun
    • Applied Science and Convergence Technology
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    • 제26권2호
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    • pp.34-41
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    • 2017
  • A 2.45 GHz microwave plasma with linear antenna has been prepared for hydrophobic and wear-resistible surface coating of carbon steel. Wear-resistible properties are required for the surface protection of cutting tools and achieved by depositing a hydrogenated amorphous carbon film on steel surface through linear microwave plasma source that has $TE_{10}-TEM$ waveguide. Compared to the existing RF plasma source driven by 13.56 MHz, linear microwave plasma source can easily generate high density plasma and provide faster deposition rate and wider process windows. In this study, $Ar/CH_4$ gas mixtures are used for hydrogenated amorphous carbon film deposition. When microwave power of 1000 W is applied, 40 cm long uniform $Ar/CH_4$ plasma could be obtained in gas pressure of 200~400 mTorr. The Vickers hardness measurement of hydrogenated amorphous carbon film on steel surface was evaluated. It was found the optimized deposition condition at $Ar:CH_4=25:25$ sccm, 300 mTorr with microwave power of 1000W and RF bias power of 100W. By deposition of hydrogenated amorphous carbon film, contact angle on steel surfaces increases from $43.9^{\circ}$ to $93.2^{\circ}$.

마이크로파 전력전송시스템의 프로토타입 설계 및 구현 (A Design and Implementation of a Prototype Microwave Power Transmission System)

  • 박민우;박진우;백승진;구자경;임종식;안달
    • 한국산학기술학회논문지
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    • 제10권9호
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    • pp.2227-2235
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    • 2009
  • 본 논문에서는 마이크로파를 이용하는 무선 전력전송시스템의 간단한 구성과 측정한 동작 특성을 제시한다. 마이크로파 전력전송시스템은 건물 안, 회의실과 같은 좁은 공간내에서 저전력을 이동 단말 기기에 공급하는 것을 목표로 한다. 실험실 수준에서 프로토타입 시스템의 제작 및 측정이 용이하도록 각 구성 회로 소자들을 직접 설계 및 제작, 측정하였는데, 마이크로파 발진기, 고출력증폭기, 마이크로스트립 패치 안테나, 저역통과여파기, 검파 및 정류회로이다. 마이크로파 무선전력전송 시스템은 중심주파수 2.4GHz에서 고정 전력 29.3dBm을 생성하여 전송하고, 수신측 패치 안테나를 수신한 전력을 정류기를 통해서 DC 전력으로 변환한다. 두 안테나간 이격 거리에 따라 측정되는 DC 전압값의 차이를 제시하고, 각 거리별로 수신측에 전달되는 DC전력량이 서로 다름을 측정값으로 제시한다.

Microwave 대역에서의 고온 및 고출력용 GaN MESFET 소자에 관한 연구 (Investigation of Microwave GaN MESFETs for High-Power and High-Temperature Application)

  • 신무환
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 1995년도 추계학술대회 논문집
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    • pp.85-88
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    • 1995
  • In this report the large-signal RF performance of GaN MESFETs at different operating temperatures is investigated using a harmonic balance modeling technique. The predicted device performance calculated by the large-si anal model of a GaN FET is shown to be in good agreement with experimen tar data. It is demonstrated that the optimal RF performance of a GaN MESFET amplifier is achieved by balancing the input impedence for a optimized de sign. A GaN MESFET with the optimized design is predicted to produce maximum RF output power of about 4W/mm and 1W/mm at room temperature and 773 K, respectively. The device produces a peak Power-Added Efficiency (PAE) of 52% and 32% at the two temperatures.

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마이크로파용 고효율 Doherty 전력증폭기 설계 (A Design of High Efficiency Doherty Power Amplifier for Microwave Applications)

  • 오정균;김동옥
    • 한국항해항만학회지
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    • 제30권5호
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    • pp.351-356
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    • 2006
  • 본 논문에서는 마이크로파 대역의 주파수를 이용해 고효율 도허티 전력 증폭기를 설계 및 제작하였다. 도허티 전력증폭기는 MRF 281 LDMOS FET를 사용하여 구현하였고, 도허티 전력 증폭기의 성능을 AB급 증폭기만 있을 때와 비교하였다. 측정결과, 구현한 도허티 전력 증폭기는 P1dB 출력전력이 2.3GHz 주파수에서 33.0dBm을 가진다. 또한, 도허티 증폭기는 주파수 $2.3GHz\sim2.4GHz$에서 이득은 11dB, 입력 반사손실 -17.8dB를 얻었다. 설계된 도허티 증폭기는 AB급 증폭기만 있을 때와 비교해서 평균 PAE는 10% 이상 개선됨을 보였고, 설계된 도허티 증폭기의 최대 PAE는 39%를 갖는다.