A dual-band coaxial waveguide mode converter is investigated.In the converter,the TEM mode(Coa.TEM)and TM01 circular waveguide(Cir.TM01)mode are transformed simultaneously into TE11 coaxial waveguide(Coa.TE11)mode and...A dual-band coaxial waveguide mode converter is investigated.In the converter,the TEM mode(Coa.TEM)and TM01 circular waveguide(Cir.TM01)mode are transformed simultaneously into TE11 coaxial waveguide(Coa.TE11)mode and TE11 circular waveguide(Cir.TE11)mode,respectively.The optimized geometrical dimensions are achieved by employing the mode coupling theory.A mode converter at 1.3 GHz and 5.0 GHz is designed,and conversion efficiencies of Coa.TEM−to-Coa.TE11 and Cir.TM01−to-Cir.TE11 are 99.88%and 99.70%at central frequency,respectively.Over the frequency ranges 1.15–1.51 GHz and 4.87–5.19 GHz,the conversion efficiency exceeds 90%.A good agreement between theoretical calculations and computer simulations is observed,demonstrating the feasibility of the dual-band mode converter.展开更多
To measure the radiation properties of relativistic diffraction generator （RDG） in Ka-band, a TMon modal excitation model is established, which consists of an overmoded circular waveguide and a coaxial line feeding ...To measure the radiation properties of relativistic diffraction generator （RDG） in Ka-band, a TMon modal excitation model is established, which consists of an overmoded circular waveguide and a coaxial line feeding probe. Using the transverse E-field mode matching and the conservation of complex power technique （CCPT）, we deduce the scattering matrix at coaxial line to coaxial line and coaxial line to circular waveguide junctions. Then using the overall cascaded junction scattering matrix, the numerical results for the reflection coefficient of the coaxial line and the power distribution of TMon multi-modal are presented. The numerical results are in agreement with HFSS simulation results and experimental results. The analysis shows that by choosing the appropriate position of coaxial line probe, the power proportion of the device operating mode excited in circular waveguide could be the largest.展开更多
基金by the National High-Tech Research and I Development Program of China and in part by the Fund of Innovation of the Graduate School of NUDT.
文摘A dual-band coaxial waveguide mode converter is investigated.In the converter,the TEM mode(Coa.TEM)and TM01 circular waveguide(Cir.TM01)mode are transformed simultaneously into TE11 coaxial waveguide(Coa.TE11)mode and TE11 circular waveguide(Cir.TE11)mode,respectively.The optimized geometrical dimensions are achieved by employing the mode coupling theory.A mode converter at 1.3 GHz and 5.0 GHz is designed,and conversion efficiencies of Coa.TEM−to-Coa.TE11 and Cir.TM01−to-Cir.TE11 are 99.88%and 99.70%at central frequency,respectively.Over the frequency ranges 1.15–1.51 GHz and 4.87–5.19 GHz,the conversion efficiency exceeds 90%.A good agreement between theoretical calculations and computer simulations is observed,demonstrating the feasibility of the dual-band mode converter.
基金supported by the National Natural Science Foundation of Chinaunder Grant No.60571020
文摘To measure the radiation properties of relativistic diffraction generator （RDG） in Ka-band, a TMon modal excitation model is established, which consists of an overmoded circular waveguide and a coaxial line feeding probe. Using the transverse E-field mode matching and the conservation of complex power technique （CCPT）, we deduce the scattering matrix at coaxial line to coaxial line and coaxial line to circular waveguide junctions. Then using the overall cascaded junction scattering matrix, the numerical results for the reflection coefficient of the coaxial line and the power distribution of TMon multi-modal are presented. The numerical results are in agreement with HFSS simulation results and experimental results. The analysis shows that by choosing the appropriate position of coaxial line probe, the power proportion of the device operating mode excited in circular waveguide could be the largest.
