Dissertation > Excellent graduate degree dissertation topics show

For high power microwave measurement aperture-coupled directional coupler Research and Design

Author: CaoNaiSheng
Tutor: LuoYong
School: University of Electronic Science and Technology
Course: Physical Electronics
Keywords: small-aperture directional coupler multi-hole coupling binomial distribution Chebychev distribution
CLC: TN622
Type: Master's thesis
Year: 2008
Downloads: 387
Quote: 4
Read: Download Dissertation

Abstract


Directional coupler is a widely applied microwave component in the microwave system. It can be applied in the signal generator to surveillance the power and in the receiver to be a mixer. Although researches on small-aperture coupling directional coupler in China and abroad have been long lasted, greatly varied and widely ranged, and it is a mature technology, less concern has been given to directional couplers from a transverse electric mode in a circular waveguide to the fundamental mode in a rectangular waveguide and the reports related are rare.To characterize the output of high power, short pulse microwave sources, it is often necessary to couple a small fraction of the power into a subsystem to measure the frequency, pulse waveform, and peak power. Especially in gyrotron devices, this usually entails a coupler from circular waveguide to rectangular waveguide. And, because we usually use an overmoded waveguide as the main system for high power generation and transmission, not only high directivity but also wide bandwidth is required for the coupler. So it is necessary to take a systematic research on small-aperture coupling directional coupler from circular waveguide to rectangular waveguide. The dissertation values a lot not only for theory research but for practical application.Based on some issues in hand, this dissertation took a deep and systematic research on small-aperture coupling directional coupler. Firstly, the simple case, single-hole coupling, was discussed. In the case, the hole was set at the symmetrical center of waveguides. Secondly, on base of single-hole coupling, multi-hole coupling was analyzed. The methods and approaches of these cases were compared, which were equal radius distribution, binomial distribution, Chebychev distribution, on situations discussed in details. The compared and analysis of different approaches can help us to optimize the design and to get wider application.Research works of this dissertation are as follows:1.The basic theory about small-aperture directional coupler was deduced and consummated systematically. The size of directional coupler and formula of electromagnetic field were obtained. All of these give us a full design theory of small-aperture couplers. Lots of results by this research provided not only for this field but also for other correlative fields.2.The theory analysis and numerical values computation of aperture coupling was made, and the aperture coupling was simulated in HFSS. The compared results can show that the theory is reasonable.3.In multi-hole coupling, the results were analyzed with different aperture distribution, which were equal radius distribution, binomial distribution, Chebychev distribution. Some useful conclusions were made out.4.The influence on directional coupler’s feature parameters by its variable dimension was researched.

Related Dissertations

  1. 360 ° phase shifter ESC Design and Optimization,TN623
  2. Direction of the high degree of flatness and high broadband directional coupler design research,TN622
  3. Small aperture glass-ceramics based on helium-neon laser fundamental transverse mode selected experimental study,TN248
  4. The Studies on Structure Dynamics of Microbial Community in the Stroma Cushion of Microbial Fermentation Bed Pigsty in High Temperature Season,S852.6
  5. E-Bayes Estimations and Its Applications of the Parameters,O212.8
  6. The Filter Properties of Photonic Crystal and Optimization Design of a Photonic Crystal Beam Splitter,O734
  7. Study on Terahertz Emission Properties of Small-Aperture Photoconductive Antenna,TN822
  8. The Investigation on Risk Theory Based on Non-Life Insurance Actuarial Science,F840.6
  9. Wideband microwave NDT hardware systems research,TP274.5
  10. The Design of Microstrip Directional Coupler with Automatic Directivity Tuning,TN622
  11. The Research of Compound Negative Binomial Risk Model,F840
  12. The Study and Improvement of a Kind of Risk Model,F842
  13. Simultaneous Confidence Intervals for Multivariate Binomial Proportions,O211.3
  14. 40GHz power amplifier Automatic Test System,TN722.75
  15. Modelling Eggs Distribution and Immune System Dynamics in Schistosome Japonicum Infected Hosts,R532.21
  16. Research of the Illimeterwave High Power Amplifier Based on Solid State Power Synthesis Technology,TN722.75
  17. The Study for the Key Techniques of Silicon Optical Waveguide and Its Device Structure,TN252
  18. Basic Studies of Magneto-Optical Waveguide Devices,TN252
  19. Trust of wireless sensor networks,TN918.82
  20. Ka-band solid-state pulsed power amplification technology,TN722.75
  21. LTE Design and Research of passive RF components,TN929.5

CLC: > Industrial Technology > Radio electronics, telecommunications technology > Electronic components, assemblies > Microwave transmission control components > Couplers, directional couplers
© 2012 www.DissertationTopic.Net  Mobile