Pub Date : 2021-09-13DOI: 10.1109/ucmmt53364.2021.9569909
Tianming Bai, Di Jiang, Kai Zhu, Yuxin Liu, Tianliang Zhang, Jie Gao, Kainan Qi
Because the liquid crystal material has fluidity and electrical control characteristics, it is suitable for conformal phased array design, this paper designed a cylindrical conformal phased array antenna based on liquid crystal material. The designed conformal phased array antenna has a center frequency of 15GHz, a 5×5 uniform array, and a cylindrical radius of 80mm, which can achieve gradient gain scanning (14.17dBi-21.4dBi), and the scanning range is ±30°. The designed antenna array has certain practical prospects.
{"title":"Design of cylindrical conformal liquid crystal phased array antenna","authors":"Tianming Bai, Di Jiang, Kai Zhu, Yuxin Liu, Tianliang Zhang, Jie Gao, Kainan Qi","doi":"10.1109/ucmmt53364.2021.9569909","DOIUrl":"https://doi.org/10.1109/ucmmt53364.2021.9569909","url":null,"abstract":"Because the liquid crystal material has fluidity and electrical control characteristics, it is suitable for conformal phased array design, this paper designed a cylindrical conformal phased array antenna based on liquid crystal material. The designed conformal phased array antenna has a center frequency of 15GHz, a 5×5 uniform array, and a cylindrical radius of 80mm, which can achieve gradient gain scanning (14.17dBi-21.4dBi), and the scanning range is ±30°. The designed antenna array has certain practical prospects.","PeriodicalId":117712,"journal":{"name":"2021 14th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies (UCMMT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132431133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-09-13DOI: 10.1109/ucmmt53364.2021.9569931
A. Zaman, N. Almond, Yuezhen Lu, X. Romain, Décio F. Alves de Lima, Hungyen Lin, Oliver J. Burton, J. Alexander-Webber, S. Hofmann, T. Mitchell, J. Griffiths, H. Beere, D. Ritchie, R. Degl’Innocenti
the realization of terahertz external amplitude modulators with a carrier frequency of 0.8 THz is presented for application in the next generation near-field wireless communications.
提出了一种载波频率为0.8太赫兹的太赫兹外调幅器的实现方法，用于下一代近场无线通信。
{"title":"Graphene-based External Optoelectronic Terahertz Modulators for High Speed Wireless Communications","authors":"A. Zaman, N. Almond, Yuezhen Lu, X. Romain, Décio F. Alves de Lima, Hungyen Lin, Oliver J. Burton, J. Alexander-Webber, S. Hofmann, T. Mitchell, J. Griffiths, H. Beere, D. Ritchie, R. Degl’Innocenti","doi":"10.1109/ucmmt53364.2021.9569931","DOIUrl":"https://doi.org/10.1109/ucmmt53364.2021.9569931","url":null,"abstract":"the realization of terahertz external amplitude modulators with a carrier frequency of 0.8 THz is presented for application in the next generation near-field wireless communications.","PeriodicalId":117712,"journal":{"name":"2021 14th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies (UCMMT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129285297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-09-13DOI: 10.1109/ucmmt53364.2021.9569934
Liang Zhang, A. Phelps, K. Ronald, A. Cross, Jin Zhang, Xiao-dong Chen, Jie Xie
Pseudospark (PS) sourced beams have unique features of high-current density and self-focusing by the ion channel. This paper presents the characteristics of the PS-sourced beam from PIC simulations, as well as the potential of the PS-sourced beam for driving a THz extended interaction oscillator (EIO) operating at 350 GHz.
{"title":"Simulations of pseudospark discharge and its generated beam to drive a THz EIO","authors":"Liang Zhang, A. Phelps, K. Ronald, A. Cross, Jin Zhang, Xiao-dong Chen, Jie Xie","doi":"10.1109/ucmmt53364.2021.9569934","DOIUrl":"https://doi.org/10.1109/ucmmt53364.2021.9569934","url":null,"abstract":"Pseudospark (PS) sourced beams have unique features of high-current density and self-focusing by the ion channel. This paper presents the characteristics of the PS-sourced beam from PIC simulations, as well as the potential of the PS-sourced beam for driving a THz extended interaction oscillator (EIO) operating at 350 GHz.","PeriodicalId":117712,"journal":{"name":"2021 14th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies (UCMMT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116688210","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-09-13DOI: 10.1109/ucmmt53364.2021.9569940
Jin Li, QianRong Ye, Junchuan Guo, Rui Min, Yuliang Li
Compared with microwave synthetic aperture radar (SAR), terahertz SAR (THz SAR) is easier to achieve ultrahigh-resolution image but more difficult to compensate motion errors. For the reason that there are more motion errors to be considered in THz SAR, in addition to the low-frequency phase errors (LPEs) in conventional microwave SAR, the high-frequency phase errors (HPEs) caused by tiny high-frequency vibration of the platform must be handled prudently. To compensate all kind of motion errors simultaneously, this paper starts from the defocused image, proposes a non-parametric compensation algorithm based on entropy-minimization, which does not make any hypothesis of the phase error. Newton method is used to implement optimal search of phase error. Finally, the effectiveness of the proposed algorithm is demonstrated by simulation results.
{"title":"Motion Compensation Algorithm Based on Entropy-Minimization for Terahertz SAR","authors":"Jin Li, QianRong Ye, Junchuan Guo, Rui Min, Yuliang Li","doi":"10.1109/ucmmt53364.2021.9569940","DOIUrl":"https://doi.org/10.1109/ucmmt53364.2021.9569940","url":null,"abstract":"Compared with microwave synthetic aperture radar (SAR), terahertz SAR (THz SAR) is easier to achieve ultrahigh-resolution image but more difficult to compensate motion errors. For the reason that there are more motion errors to be considered in THz SAR, in addition to the low-frequency phase errors (LPEs) in conventional microwave SAR, the high-frequency phase errors (HPEs) caused by tiny high-frequency vibration of the platform must be handled prudently. To compensate all kind of motion errors simultaneously, this paper starts from the defocused image, proposes a non-parametric compensation algorithm based on entropy-minimization, which does not make any hypothesis of the phase error. Newton method is used to implement optimal search of phase error. Finally, the effectiveness of the proposed algorithm is demonstrated by simulation results.","PeriodicalId":117712,"journal":{"name":"2021 14th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies (UCMMT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121491446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-09-13DOI: 10.1109/ucmmt53364.2021.9569898
Mingyao Guan, Bo Zhang
This paper presents a broadband 3 dB directional coupler based on a multi-branch hybrid waveguide. By placing a two-stage stepped waveguide-height discontinuity in the middle of the coupler symmetrically, a controllable ripple is introduced to achieve better overall amplitude imbalance. The simulation results show that over the most of the operating frequency bands from 385 GHz to 481 GHz, the amplitude imbalance is less than 0.037dB. The return loss of the operating frequency band is less than −17 dB and the phase imbalance is better than ± 1.85°.
{"title":"A Broadband 3 dB Directional Coupler With Ultra-Low Amplitude Imbalance","authors":"Mingyao Guan, Bo Zhang","doi":"10.1109/ucmmt53364.2021.9569898","DOIUrl":"https://doi.org/10.1109/ucmmt53364.2021.9569898","url":null,"abstract":"This paper presents a broadband 3 dB directional coupler based on a multi-branch hybrid waveguide. By placing a two-stage stepped waveguide-height discontinuity in the middle of the coupler symmetrically, a controllable ripple is introduced to achieve better overall amplitude imbalance. The simulation results show that over the most of the operating frequency bands from 385 GHz to 481 GHz, the amplitude imbalance is less than 0.037dB. The return loss of the operating frequency band is less than −17 dB and the phase imbalance is better than ± 1.85°.","PeriodicalId":117712,"journal":{"name":"2021 14th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies (UCMMT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134315704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-09-13DOI: 10.1109/ucmmt53364.2021.9569942
Yuncheng Zhao, Yaxin Zhang, S. Liang, S. Qiao, Ziqiang Yang, Zhisong Hao, Libin Jiao
In the traditional terahertz spatial modulator, the scale of the metamaterial must be equivalent to the area of the terahertz spot in free space to obtain effective terahertz modulation. Large-scale artificial microstructure arrays increase the complexity of metamaterial circuits, which leads to problems such as mode parasitic and impedance mismatches inside the metamaterial. In order to effectively reduce the scale of the metamaterial array, so as to manipulate the terahertz wave more efficiently, in this paper, we propose a technical scheme for loading the spatial modulator with waveguide. By regulating the carrier concentration of 2DEG in metamaterial chip, the efficient control of metamaterial mode to waveguide mode has been realized. Static modulation depth of this device can reach up to 13.5dB. More importantly, in the dynamic test, 8 GHz sinusoidal signals was received by a THz mixer receiver. It may provide a way to achieve high-performance active devices in THz wireless communication system.
{"title":"High-Speed Terahertz Modulation Based on the Control of Metamaterial Mode to Waveguide Mode","authors":"Yuncheng Zhao, Yaxin Zhang, S. Liang, S. Qiao, Ziqiang Yang, Zhisong Hao, Libin Jiao","doi":"10.1109/ucmmt53364.2021.9569942","DOIUrl":"https://doi.org/10.1109/ucmmt53364.2021.9569942","url":null,"abstract":"In the traditional terahertz spatial modulator, the scale of the metamaterial must be equivalent to the area of the terahertz spot in free space to obtain effective terahertz modulation. Large-scale artificial microstructure arrays increase the complexity of metamaterial circuits, which leads to problems such as mode parasitic and impedance mismatches inside the metamaterial. In order to effectively reduce the scale of the metamaterial array, so as to manipulate the terahertz wave more efficiently, in this paper, we propose a technical scheme for loading the spatial modulator with waveguide. By regulating the carrier concentration of 2DEG in metamaterial chip, the efficient control of metamaterial mode to waveguide mode has been realized. Static modulation depth of this device can reach up to 13.5dB. More importantly, in the dynamic test, 8 GHz sinusoidal signals was received by a THz mixer receiver. It may provide a way to achieve high-performance active devices in THz wireless communication system.","PeriodicalId":117712,"journal":{"name":"2021 14th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies (UCMMT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133839141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-09-13DOI: 10.1109/ucmmt53364.2021.9569947
Yuyuan Fan, Sheng Xie, Yu Luo, Kaixue Ma
This paper proposes a 340GHz on-chip antenna with enhanced gain and radiation efficiency. In the proposed on-chip antenna, a rectangle slot loop is etched in the upper wall of a substrate integrated waveguide (SIW). The SIW structure forms a 1/4 wavelength resonant cavity with the radiator, reflecting electromagnetic waves back to the radiator. Multi-point feeding significantly improves Radiation efficiency. Designed and optimized using a standard 0.13-µm SiGe BiCMOS process and compared with ordinary patch antenna. The simulation results show that both gain and radiation efficiency are improved, the gain is 5.41dBi, and the radiation efficiency is about 49.7% at 340GHz.
{"title":"Gain and Radiation Efficiency Enhance Terahertz On-Chip Antenna Based on 0.13-µm SiGe BiCMOS","authors":"Yuyuan Fan, Sheng Xie, Yu Luo, Kaixue Ma","doi":"10.1109/ucmmt53364.2021.9569947","DOIUrl":"https://doi.org/10.1109/ucmmt53364.2021.9569947","url":null,"abstract":"This paper proposes a 340GHz on-chip antenna with enhanced gain and radiation efficiency. In the proposed on-chip antenna, a rectangle slot loop is etched in the upper wall of a substrate integrated waveguide (SIW). The SIW structure forms a 1/4 wavelength resonant cavity with the radiator, reflecting electromagnetic waves back to the radiator. Multi-point feeding significantly improves Radiation efficiency. Designed and optimized using a standard 0.13-µm SiGe BiCMOS process and compared with ordinary patch antenna. The simulation results show that both gain and radiation efficiency are improved, the gain is 5.41dBi, and the radiation efficiency is about 49.7% at 340GHz.","PeriodicalId":117712,"journal":{"name":"2021 14th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies (UCMMT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122792078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-09-13DOI: 10.1109/ucmmt53364.2021.9569872
Jeevan M. Rao, Rupa Basu, R. Letizia, C. Paoloni
D-band TWTs (151 – 161.5 GHz) are the enabling devices for long range links with high capacity at sub-THz frequency. The EPSRC DLINK project aims to produce a front end to provide about 45 Gb/s for 1 kilometre range in point to point with 99.99% availability in ITU zone K. The design and fabrication of the TWTs is in progress. The short wavelength at D-band needs high precision fabrication and strict tolerances. This paper will discuss the impact of variation of dimensions against the nominal design value of the double corrugated waveguide for a 151 – 161.5 GHz TWT, highlighting the design parameters that needs higher accuracy.
{"title":"Tolerance Analysis of Double Corrugated Waveguide for D-band TWT","authors":"Jeevan M. Rao, Rupa Basu, R. Letizia, C. Paoloni","doi":"10.1109/ucmmt53364.2021.9569872","DOIUrl":"https://doi.org/10.1109/ucmmt53364.2021.9569872","url":null,"abstract":"D-band TWTs (151 – 161.5 GHz) are the enabling devices for long range links with high capacity at sub-THz frequency. The EPSRC DLINK project aims to produce a front end to provide about 45 Gb/s for 1 kilometre range in point to point with 99.99% availability in ITU zone K. The design and fabrication of the TWTs is in progress. The short wavelength at D-band needs high precision fabrication and strict tolerances. This paper will discuss the impact of variation of dimensions against the nominal design value of the double corrugated waveguide for a 151 – 161.5 GHz TWT, highlighting the design parameters that needs higher accuracy.","PeriodicalId":117712,"journal":{"name":"2021 14th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies (UCMMT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126359448","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-09-13DOI: 10.1109/ucmmt53364.2021.9569941
Zheng Wen, Jirun Luo
A beam-wave resynchronization method of the non-periodic slow-wave structure for TWTs is proposed. The condition of the beam-wave interaction is derived, analyzed and discussed. The non-periodic folded-waveguide SWS (NP FW-SWS) is introduced as an application example. The simulated results show that when the input signal is 0.4 W, the output power of the NP FW-TWT can be improved from 199 W to 233 W, and the corresponding electron efficiency can be increased from 27.6% to 32.4% accordingly. For the NP FW-TWTs, the particle velocity and phase velocity at 94 GHz along with the number of elements are also given and compared, which indicates that the beam-wave resynchronization method is beneficial for efficiency enhancement.
{"title":"Beam-Wave Resynchronization Method of the Non-Periodic Slow-Wave Structure for TWTs","authors":"Zheng Wen, Jirun Luo","doi":"10.1109/ucmmt53364.2021.9569941","DOIUrl":"https://doi.org/10.1109/ucmmt53364.2021.9569941","url":null,"abstract":"A beam-wave resynchronization method of the non-periodic slow-wave structure for TWTs is proposed. The condition of the beam-wave interaction is derived, analyzed and discussed. The non-periodic folded-waveguide SWS (NP FW-SWS) is introduced as an application example. The simulated results show that when the input signal is 0.4 W, the output power of the NP FW-TWT can be improved from 199 W to 233 W, and the corresponding electron efficiency can be increased from 27.6% to 32.4% accordingly. For the NP FW-TWTs, the particle velocity and phase velocity at 94 GHz along with the number of elements are also given and compared, which indicates that the beam-wave resynchronization method is beneficial for efficiency enhancement.","PeriodicalId":117712,"journal":{"name":"2021 14th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies (UCMMT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127429336","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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