• Title/Summary/Keyword: Spatial combiner

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Design and fabrication of Ka-band high power and high efficiency waveguide spatial combiner (Ka 대역 고출력 고효율 도파관 공간 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.21 no.5
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    • pp.19-26
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    • 2021
  • This report proposes a waveguide spatial combiner with high power low loss. The proposed spatial combiner implements high power by combining from the center of each port through a waveguide. In particular, we implement low loss using TE01 mode, which has the lowest transmission track loss among modes of circular waveguide, and miniaturization is achieved by applying a new mode conversion method. IIn addition, it was confirmed that it was suitable for high output by calculating the insulation breakdown voltage of the new mode conversion structure through E-field analysis. The final 8-way waveguide spatial combiner was designed and manufactured, and the insertion loss was less than 0.4dB and the combining efficiency was 97% or more, confirming that the electrical performance was very good compared to the planar combining method.

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 high-power, high-efficiency spatial combiner using TM01 mode Transducer (TM01 모드 변환을 이용한 Ka 대역 고출력 고효율 공간 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.21 no.6
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    • pp.25-32
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    • 2021
  • In this study, it proposes a mode converter that is relatively easy to implement and can shorten the transmission line length of the final combining port and it was fabricated and tested by applying it to an 8-way spatial combiner. The proposed mode converter converts the signal converted from the doorknob-shaped circular disk connected to the ground into the TM01 mode by opening it in the circular waveguide. The 8-way waveguide spatial combiner is designed and implemented so that 8 signals input from the H-plane are combined in a circular waveguide at the center, and the final combining mode is TM01. The test results confirmed excellent performance with an insertion loss of less than 0.4dB and a combining efficiency of 95% or more. In addition, it was confirmed that it is suitable for high output by calculating the breakdown voltage and discharge threshold power of the new mode conversion structure through electric field analysis. The results confirmed through this study are expected to be applicable to high-power, high-efficiency SSPA in various fields in the future.

Design and fabrication of Ka-band 100W SSPA using spatial combiner (공간결합기를 활용한 Ka대역 100W급 SSPA 설계 및 제작)

  • Lee, Ju-Heun;Kim, Hyo-Chul;Cho, Heung-Rae;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.1
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    • pp.35-43
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    • 2022
  • In this paper, a study was conducted to produce 20W by combining a 10W MMIC and raising the unit power amplifier to 100W SSPA by combining the 8-way spatial coupler. SSPA requires low-loss, high-efficiency coupling techniques to meet high output with the output of a single element relatively low compared to TWTA. Designed and produced in this paper, the SSPA was manufactured as a 100W SSPA by mounting eight 20W high-power amplification modules in an 8-way spatial coupler with a reflection loss of 20dB or more and an excellent coupling efficiency of 94% or more. When -10dBm was applied, it was 112.2~169.8W at 20kHz 20%, 125.9~173.8W at 400kHz 40%, 117.5~162.2W at 800kHz 40%, showing performance of over 60dB and over 100W in all three PRF conditions.

Development of the Ka-band 20watt SSPA (Solid State Power Amplifier) Using a Spatial Combiner (공간결합기를 이용한 Ka대역 20W급 SSPA 개발)

  • Choi, Young-Rak;Lee, Jong-Woo;Lee, Su-Hyun;An, Se-Hwan;Lee, Man-Hee;Kim, Hong-Rak
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.19 no.1
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    • pp.231-238
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    • 2019
  • In this paper, we have studied how to improve the amplifiers efficiency by minimizing the combining loss when several unit power amplifiers are combined to obtain high output power. Specifically, we have developed Ka-band Spatial Combining Amplifier. The fabricated Spatial Combining Amplifier is a Ka-band 20W class SSPA, which uses a 5W class unit amplifier module 8EA designed using a GaN bare die. We also combined The unit amplifier module using 8-way spatial divider and combiner with a hybrid radial structure. The output combining loss of the fabricated spatial coupler is about 0.334dB, which is about 92.6% efficiency. In this paper, we developed a Spatial Combining Amplifier with a maximum saturation output of 10W and a power addition efficiency of over 15%. As a result, we achieved the maximum saturation output of 30W and the power addition efficiency of 19%.

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%.