Study On Terahertz Power Divider And Combiner

With the depending of terahertz technology,high-power signal sources used in terahertz system are in short. In order to meet the high power output requirement for terahertz system,it is inevitably to use power combining technology,which make increasing need for power divider/combiner in terahertz system. However,limited by the inherent physical size, few instances are in success.This thesis focuses on the theory and fabrication of power divider/combiner for terahertz waveguide technology. based on the terahertz waveguide technology by MEMS,taking advantage of new process and traditional structure,and considering the new features of the terahertz frequency band,this thesis work on terahertz power divider/combiner in design theory,processing technology and testing methods.This paper provide desigh and manufacture procedure for rectangular waveguide terahertz power dividers/combiners in 380 GHz,and also 10 dB rectangular waveguide terahertz directional couplers in 340 GHz, with ideal performance index. The main content in this thesis is:Firstly, this thesis desigh and fabricate 380 GHz 3dB rectangular waveguide branch directional couplers.The first way designed in E-plane rectangular waveguide five branch lines bridge structure, and the second way designed in H-plane rectangular narrow-wall waveguide slot coupler bridge structure. Both two structure were processed by the MEMS process in a research institute.In order to ensure the test procedure,these forms are both based on WR-2.2 standard rectangular waveguide.In this paper, I designed four kinds of structure and supporting fixture corresponding indicators. All of them are tested in City University of Hong Kong. the test results completely meet project targets:frequency range of E-plane rectangular waveguide five branch lines bridge structure divider is 375 GHz to 385 GHz. Loss in this band is less than 1.6dB. Port isolation in this band is better than 32 dB,and the amplitude imbalance in this band is less than 2dB. The second way, frequency range of H-plane rectangular narrow-wall waveguide slot coupler bridge structure is 375 GHz to 385 GHz,loss in this band is less than 2dB, port isolation in this band is better than 20 dB.Secondly, this thesis desigh and fabricate 340 GHz 10dB rectangular waveguide directional couplers. It provide two ways: the first way is designed in E-plane rectangular waveguide five branch lines bridge structure, and the second wayis designed in E-plane rectangular waveguide form of “tian” coupler bridge structure. The simulation results of both ways are better than the project required indicators,and the product is still in the process, which has not been tested yet.In this paper,we successful development of terahertzpower divider/combiner,eventually form a complete set for terahertzdivider/design theory,effective power combiner processing,validation,and lay a good foundation for the development of terahertz divider /widely used power combiner and terahertz system.