A wideband low-profile aperture-coupled antenna based on a novel dual-mode-composite scheme is presented.The mode-composite scheme where the TM10 cavity mode and the TE121 dielec-tric resonator(DR)mode are combined of...A wideband low-profile aperture-coupled antenna based on a novel dual-mode-composite scheme is presented.The mode-composite scheme where the TM10 cavity mode and the TE121 dielec-tric resonator(DR)mode are combined offers an ap-proach to obtain a wide bandwidth accompanied by stable unidirectional radiation and high efficiency.The use of a lengthened coupling aperture that supports the one-wavelength resonance in the band of interest is an effective feed method of simultaneously excit-ing the two composite modes without compromising the increased complexity of the antenna geometry.An impedance bandwidth of 49%for|S_(11)|of less than-10 dB,a maximum gain of 10.8 dBi,and stable radiation patterns with low cross-polarization are realized ex-perimentally by a fabricated prototype.Considering the simplicity of the geometry,the wide bandwidth that can cover n77,n78,and n79 bands for the fifth generation(5G)mobile communications and the sat-isfying radiation performance,the proposed antenna would be a promising candidate for advanced wireless applications.展开更多
This paper proposes a new approach to further improving the bandwidth of a typical aperture-coupled stacked microstrip antenna by cutting triangular notches in the radiating sides of both radiating patches together wi...This paper proposes a new approach to further improving the bandwidth of a typical aperture-coupled stacked microstrip antenna by cutting triangular notches in the radiating sides of both radiating patches together with offsetting both patches. An antenna applying this new approach is designed,fabricated,and tested. The experimental antenna could achieve a measured impedance bandwidth of about 37.5% for the Voltage Standing Wave Ratio(VSWR) ≤ 2in X-band.展开更多
A directional coupler in a miter bend was designed to monitor the microwave power of the transmission line in an electron cyclotron resonance heating（ECRH） system. It is based on aperture-coupling theory and simulat...A directional coupler in a miter bend was designed to monitor the microwave power of the transmission line in an electron cyclotron resonance heating（ECRH） system. It is based on aperture-coupling theory and simulation of an electromagnetic（EM） field to design and optimize the 140 GHz high-power directional coupler. In addition, we simulated the double-aperture directional coupler by using three-dimensional（3D） EM simulation software, in which the central frequency is 140 GHz, coupling factor is about –70 dB, and directivity is greater than 17 dB. The results show that such a coupler is a viable tool for power measurement in high-power transmission systems.展开更多
基金supported in part by the Beijing Natural Science Foundation No.JQ22011the National Science Foundation of China for Distinguished Young Scholars under Grant No.62325102+1 种基金the National Natural Science Foundation of China under Grant No.62031004the Fundamental Research Funds for the Central Universities No.2023YJS160.
文摘A wideband low-profile aperture-coupled antenna based on a novel dual-mode-composite scheme is presented.The mode-composite scheme where the TM10 cavity mode and the TE121 dielec-tric resonator(DR)mode are combined offers an ap-proach to obtain a wide bandwidth accompanied by stable unidirectional radiation and high efficiency.The use of a lengthened coupling aperture that supports the one-wavelength resonance in the band of interest is an effective feed method of simultaneously excit-ing the two composite modes without compromising the increased complexity of the antenna geometry.An impedance bandwidth of 49%for|S_(11)|of less than-10 dB,a maximum gain of 10.8 dBi,and stable radiation patterns with low cross-polarization are realized ex-perimentally by a fabricated prototype.Considering the simplicity of the geometry,the wide bandwidth that can cover n77,n78,and n79 bands for the fifth generation(5G)mobile communications and the sat-isfying radiation performance,the proposed antenna would be a promising candidate for advanced wireless applications.
文摘This paper proposes a new approach to further improving the bandwidth of a typical aperture-coupled stacked microstrip antenna by cutting triangular notches in the radiating sides of both radiating patches together with offsetting both patches. An antenna applying this new approach is designed,fabricated,and tested. The experimental antenna could achieve a measured impedance bandwidth of about 37.5% for the Voltage Standing Wave Ratio(VSWR) ≤ 2in X-band.
基金supported by International S&T Cooperation Program of China(No.2011DFA63190)National Natural Science Foundation of China(No.11275045)the International Cooperation Plan Program of Sichuan Province,China(No.M1701040113HH0001)
文摘A directional coupler in a miter bend was designed to monitor the microwave power of the transmission line in an electron cyclotron resonance heating（ECRH） system. It is based on aperture-coupling theory and simulation of an electromagnetic（EM） field to design and optimize the 140 GHz high-power directional coupler. In addition, we simulated the double-aperture directional coupler by using three-dimensional（3D） EM simulation software, in which the central frequency is 140 GHz, coupling factor is about –70 dB, and directivity is greater than 17 dB. The results show that such a coupler is a viable tool for power measurement in high-power transmission systems.
