Demonstration of a Wideband and Compact Input/Output Coupling Structure for Sub-terahertz Sheet-Beam Traveling Wave Amplifiers
A novel methodology for the beam-wave division/combination in a sheet beam traveling wave amplifier is proposed. The design, microfabrication, and measurement of H-band (220-325 GHz) input/output coupling structures are presented in this article. This geometry is based on an E-plane Riblet coupler w...
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| Veröffentlicht in: | IEEE transactions on terahertz science and technology 2022-04, p.1-1 |
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| creator | Shu, Guoxiang Liao, Jiacai He, Jingcong Ren, Junchen Deng, Junzhe Chang, Zhiwei Tian, Yanyan Ruan, Cunjun He, Wenlong |
| description | A novel methodology for the beam-wave division/combination in a sheet beam traveling wave amplifier is proposed. The design, microfabrication, and measurement of H-band (220-325 GHz) input/output coupling structures are presented in this article. This geometry is based on an E-plane Riblet coupler with one shorted port. A rectangular single capacitive step, gradual geometries, and a rectangular septum are introduced to improve electrical performance. To experimentally validate the proposed methodology, the designed input/output coupling structure was manufactured by using nano computer numerical control milling and measured by using a vector network analyzer. A 3-dB transmission bandwidth of ~94.0 GHz (231.0-325.0 GHz), corresponding to a fractional bandwidth of 33.8%, was measured with a maximum transmission coefficient of -2.3 dB. The measured port reflection and isolation coefficients were smaller than -15.3 dB and -11.6 dB within the 3-dB transmission bandwidth, respectively. Compared with other previously reported input/output coupling structures for sheet beam traveling wave amplifiers, this structure has two significant advantages: compact configuration and wide frequency bandwidth, which make it superior and more applicable. |
| doi_str_mv | 10.1109/TTHZ.2022.3168606 |
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The design, microfabrication, and measurement of H-band (220-325 GHz) input/output coupling structures are presented in this article. This geometry is based on an E-plane Riblet coupler with one shorted port. A rectangular single capacitive step, gradual geometries, and a rectangular septum are introduced to improve electrical performance. To experimentally validate the proposed methodology, the designed input/output coupling structure was manufactured by using nano computer numerical control milling and measured by using a vector network analyzer. A 3-dB transmission bandwidth of ~94.0 GHz (231.0-325.0 GHz), corresponding to a fractional bandwidth of 33.8%, was measured with a maximum transmission coefficient of -2.3 dB. The measured port reflection and isolation coefficients were smaller than -15.3 dB and -11.6 dB within the 3-dB transmission bandwidth, respectively. 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The design, microfabrication, and measurement of H-band (220-325 GHz) input/output coupling structures are presented in this article. This geometry is based on an E-plane Riblet coupler with one shorted port. A rectangular single capacitive step, gradual geometries, and a rectangular septum are introduced to improve electrical performance. To experimentally validate the proposed methodology, the designed input/output coupling structure was manufactured by using nano computer numerical control milling and measured by using a vector network analyzer. A 3-dB transmission bandwidth of ~94.0 GHz (231.0-325.0 GHz), corresponding to a fractional bandwidth of 33.8%, was measured with a maximum transmission coefficient of -2.3 dB. The measured port reflection and isolation coefficients were smaller than -15.3 dB and -11.6 dB within the 3-dB transmission bandwidth, respectively. 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The design, microfabrication, and measurement of H-band (220-325 GHz) input/output coupling structures are presented in this article. This geometry is based on an E-plane Riblet coupler with one shorted port. A rectangular single capacitive step, gradual geometries, and a rectangular septum are introduced to improve electrical performance. To experimentally validate the proposed methodology, the designed input/output coupling structure was manufactured by using nano computer numerical control milling and measured by using a vector network analyzer. A 3-dB transmission bandwidth of ~94.0 GHz (231.0-325.0 GHz), corresponding to a fractional bandwidth of 33.8%, was measured with a maximum transmission coefficient of -2.3 dB. The measured port reflection and isolation coefficients were smaller than -15.3 dB and -11.6 dB within the 3-dB transmission bandwidth, respectively. Compared with other previously reported input/output coupling structures for sheet beam traveling wave amplifiers, this structure has two significant advantages: compact configuration and wide frequency bandwidth, which make it superior and more applicable.</abstract><pub>IEEE</pub><doi>10.1109/TTHZ.2022.3168606</doi></addata></record> |
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| subjects | Couplers Couplings Electron beams Electrooptical waveguides input/output coupling structure Planar waveguides Reflection sheet beam traveling wave tube sub-terahertz wide bandwidth Wideband |
| title | Demonstration of a Wideband and Compact Input/Output Coupling Structure for Sub-terahertz Sheet-Beam Traveling Wave Amplifiers |
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