• Title/Summary/Keyword: combining efficiency

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Gain and phase control method which increasing RF power combiners combining efficiency (RF전력결합기의 결합효율을 높이는 이득과 위상 제어방법)

  • 정형태;강원태;장익수
    • Journal of the Korean Institute of Telematics and Electronics D
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    • v.35D no.4
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    • pp.47-52
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    • 1998
  • As to power combining system, it is very important to achieve a high combining efficiency in order to minimize theamount of prime power needed and hence the cooling requirements, all of which translate into reduced cost. The combining efficiency is degraded in practice by variation in the amplitude and phase of the signals to be combined. In this paper, the new power combining newtork is proposed and realized which has the automatic gain and phase control system. This control system makes amplituede and phase variation of its all path equal. When the amplitude and phase variations are within 0~5dB and .+-.50.deg., the results show that high combining efficiency is maintained.

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A Coaxial Waveguide-based Spatial Combiner Using Finline-to-Microstrip Transitions (핀라인-마이크로스트립 변환을 이용한 동축선로 도파관 형태의 공간 결합기)

  • Kim, Bo-Ki;Lee, Su-Hyun;Kim, Hyoung-Jong;Shin, Suk-Woo;Kim, Sang-Hoon;Kim, Jae-Duk;Choi, Jin-Joo;Kim, Seon-Joo
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.10 no.5
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    • pp.79-86
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    • 2011
  • In this paper, a S-band coaxial waveguide-based spatial combiner is proposed. The proposed combiner consists of coaxial waveguide, impedance transformer, and finline-to-microstrip transformer. The coaxial waveguide is used as the host of the combining circuits for higher output power and better uniformity by equally distributing the input power to each element. The finline-to-microstrip transformer is designed by using antipodal antenna, and obtained low reflection coefficient by applying the small reflection theorem. The measurement results show the coaxial waveguide combiner has a maximum combining efficiency of 95%.

Design and Fabrication of Ka-band Waveguide Combiner with High Efficiency and High Isolation Characteristics (고효율 및 높은 격리 특성을 갖는 Ka 대역 도파관 결합기 설계 및 제작)

  • Kim, Hyo-Chul;Cho, Heung-Rae;Lee, Ju-Heun;Lee, Deok-Jae;An, Se-Hwan;Lee, Man-Hee;Joo, Ji-Han;Kim, Hong-Rak
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.22 no.2
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    • pp.35-42
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    • 2022
  • In this paper, a method to increase the combining efficiency and isolation of the combiner, the core module of SSPA (solid state amplifier), was studied. Specifically, the isolation was secured by matching the common port and the isolation port in the waveguide combiner. The matching structure for matching is in the form of a circular disk and is engraved inside the waveguide combiner. The structure is very simple, so it is possible to secure stable performance. And this structure showed more than 60 times higher critical power performance compared to previous studies, confirming that it is suitable for high output. And by combining 1-stage T-junction and 2, 3 stage MagicT combiner, miniaturization was achieved and the combining efficiency was optimized by reducing the insertion loss. The fabricated waveguide coupler obtained an isolation of 16dB or more and a coupling efficiency of 86.2%.

Numerical Study of SPGD-based Phase Control of Coherent Beam Combining under Various Turbulent Atmospheric Conditions (대기외란에 따른 SPGD 기반 결맞음 빔결합 시스템 위상제어 동작성능 분석)

  • Kim, Hansol;Na, Jeongkyun;Jeong, Yoonchan
    • Korean Journal of Optics and Photonics
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    • v.31 no.6
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    • pp.247-258
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    • 2020
  • In this paper, based on a stochastic parallel gradient descent (SPGD) algorithm we study phase control of a coherent-beam-combining system under turbulent atmospheric conditions. Based on the statistical theory of atmospheric turbulence, we carry out the analysis of the phase and wavefront distortion of a laser beam propagating through a turbulent atmospheric medium. We also conduct numerical simulations of a coherent-beam-combining system with 7- and 19-channel laser beams distorted by atmospheric turbulence. Through numerical simulations, we characterize the phase-control characteristics and efficiency of the coherent-beam-combining system under various degrees of atmospheric turbulence. It is verified that the SPGD algorithm is capable of realizing 7-channel coherent beam combining with a beam-combining efficiency of more than 90%, even under the turbulent atmospheric conditions up to cn2 of 10-13 m-2/3. In the case of 19-channel coherent beam combining, it is shown that the same turbulent atmospheric conditions result in a drastic reduction of the beam-combining efficiency down to 60%, due to the elevated impact of the corresponding refractive-index inhomogeneity. In addition, by putting together the number of iterations of the SPGD algorithm required for phase locking under atmospheric turbulence and the time intervals of atmospheric phenomena, which typically are of the order of ㎲, it is estimated that hundreds of MHz to a few GHz of computing bandwidth of SPGD-based phase control may be required for a coherent-beam-combining system to confront such turbulent atmospheric conditions. We expect the results of this paper to be useful for quantitatively analyzing and predicting the effects of atmospheric turbulence on the SPGD-based phase-control performance of a coherent-beam-combining system.

A Study on a Ku-Band High Power and High Efficiency Radial Combiner (Ku 대역 고출력 고효율 Radial Combiner에 대한 연구)

  • Yun, Song-Hyun;Kim, Si-Ok;Lee, Su Hyun;Lim, Byeong-Ok;Lee, Bok-Hyung;Jeon, Yong-Kyu;Kim, Hyun-Kyu;Yoo, Young-Geun
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.28 no.5
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    • pp.400-409
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    • 2017
  • We have studied a combiner that can withstand high power while minimizing insertion loss in high frequency band. In particularly, because the output power that can be output per unit elements is much lower in the Ku band and above than in the low frequency band, it is necessary to combine many semiconductor elements in order to make a high power SSPA. A planar combiner such as a microstrip, as the number of elements to be combined increases, the insertion loss increases proportionally, resulting in a reduction in the overall system efficiency and an increase heating value also. The planar combiner also have some problems due to the low power handling rate. To improve these problems, we proposed a Cavity Radial Combiner. A Ku band 16-way Cavity Radial Combiner was fabricated and measured. As a result, it was tested 14dB return loss and over 94.5 % output combining efficiency in design band.

A Design and Fabrication of a High Power SSPA for C-Band Satellite Communication (C-Band 위성통신용 고출력 증폭기의 설계 및 제작)

  • 예성혁;윤순경;전형준;나극환
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • 1996.06a
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    • pp.27-31
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    • 1996
  • In this paper, The SSPA(Solid State Power Amplifier) is 100 watts amplifier which is used with C-Band Satellite communication Up-Link frequency, 5.875 ∼6.425 GHz. SSPA requires more output power than is available from a single GaAs FET with result it is necessary to combine the output of many device. To achieve a high power, it is important to make a good N-way power divider which has a small different phase, good combining efficiency and high power handling capability. The reliability of Power GaAs FET decrease with increasing junction temperature, power amplifier in general dissipate amount of power. It is important to provide them with a heatsink and a temperature compensation circuit to dispose of the unwanted heat. To compensate temperature, Using PIN diode attenuator, it is enable to get a precision gain control. The output power of the SSPA is more than 100 watt with which the TWTA (Traveling-Wave Tube Amplifier) can be replaced. Each stage was measured by the Network analyzer PH8510C, Power meter Booton 42BD, The gain is more than 53 dB, flatness is less than 1.5 dB.

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High Efficiency V-band Power Combining Modules Using Slotline-to-Microstrip Transition (슬롯라인-마이크로스트립 변환을 이용한 고효율 V-band 전력 결합 모듈)

  • Kim Dong-Ki;Jeong Jin-Ho;Kwon Young-Woo
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.16 no.6 s.97
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    • pp.580-585
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    • 2005
  • Two high-efficiency and high power power-combing modules were developed using slotline-to-microstrip transition at V-band. Power-combining modules incorporating two MMIC power amplifiers demonstrated combining efficiencies higher than $80\%$(maximum $86\%$) with saturated output power of 22.96 dBm and 22.81 dBm, respectively. The measurement of back-to-back connected combiners demonstrated insertion loss less than 1.2 dB with return loss better than 15 dB around 60 GHz, respectively.

Analysis of Power Degradation and Distortion in Coherent-Beam Combining with Lens Aberration (렌즈 수차에 의한 타일형 빔 결합 출력 감쇠와 왜곡 현상 분석)

  • Kim, Byungho;Na, Jeongkyun;Jeong, Yoonchan
    • Korean Journal of Optics and Photonics
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    • v.31 no.6
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    • pp.290-294
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    • 2020
  • In this paper, we quantitatively analyze the effect of lens aberration on the degradation of beam-coupling efficiency of a tiled coherent-beam combining system. The Zernike polynomial is used to quantify the aberration of the lens, and Fresnel diffraction is applied to numerically simulate the change in the peak light intensity when combined at a distance. The results of this paper will be useful for quantitative prediction of the beam-combining efficiency that is degraded by aberration of the lens, and it is expected to be helpful for the optimal design of a practical tiled coherent beam-combining system.

A Study on the Wideband Spatial Power Combiner with the Printed Dipole Antennas (평면형 다이폴 안테나를 이용한 광대역 공간 전력 합성기에 관한 연구)

  • 이성호;권세용;윤영중;송우영
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.29 no.6A
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    • pp.677-682
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    • 2004
  • In this paper, A novel spatial power combiner with wideband printed dipole antennas and balanced amplifier is proposed. The wideband spatial power combiner is proposed to improve power capability and bandwidth by using balanced amplifier and wideband printed dipole antenna, respectively, The proposed 4${\times}$1 spatial power combiner with those components has the characteristics that the 3-dB bandwidth is 1.02 GHz (17 %), and the effective isotropic power gain (EIPG) is 24.04 dB at 6 GHz. Also, power combining efficiency is 68.69%.

Control and Monitoring of Wavelengths in Spectral Beam Combining System Based on High Resolution Camera (고해상도 카메라 기반 파장 빔 결합 시스템의 다중 광원의 모니터링과 파장 제어 기법 연구)

  • Seung, Ji Hoon;Lee, Kwang Hyun;Lee, Jung Hwan
    • IEMEK Journal of Embedded Systems and Applications
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    • v.14 no.6
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    • pp.321-327
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    • 2019
  • Spectral Beam Combining (SBC) is used for a high-power fiber laser in order to overcome the power limitation of single fiber laser. In SBC, several laser bwams with different wavelengths are combined to obtain a single-aperture beam by diffraction grating. The combining efficiency is dependent on a linewidth, beam quality and specific wavelength of each beam among others. In this paper, we consider the method of a wavelength monitoring and a feedback control of laser diodes used as seeds of laser beams to obtain optimum combining conditions. In order to measure the wavelengths of multi-beam, we use the high resolution camera and diffraction grating with 1,800l/mm. The experiment results show the possibility of feedback control of a current and temperature of multi-seed laser diodes to obtain optimum wavelengths for SBC.