Jie Ma, Yichang Zhao, Wei-Zhi Wang, Ke Liang, Long Shi, Bo Chen, Ming-dong Li
{"title":"Frequency Reconfigurable Antenna Considering Radiation Beam Width","authors":"Jie Ma, Yichang Zhao, Wei-Zhi Wang, Ke Liang, Long Shi, Bo Chen, Ming-dong Li","doi":"10.1109/UCMMT49983.2020.9296007","DOIUrl":"https://doi.org/10.1109/UCMMT49983.2020.9296007","url":null,"abstract":"A frequency reconfigurable microstrip antenna is proposed. A circular patch and a C-shaped ring are used for different frequency bands and the two parts are connected by the PIN diode. The two parts can be one resonator when the PIN diode is shorted, otherwise to make the two parts independent. Because the main resonators are different for the different bands, the beam widths can be tuned to be similar for both bands. Simulated results show that the proposed antenna can cover frequency bands of 4.64–4.7GHz and 7.77–7.9GHz with reflection coefficient below −10 dB. The 3dB beam widths are between ± 40° to ±47°.","PeriodicalId":274385,"journal":{"name":"2020 13th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies (UCMMT)","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124575682","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}
{"title":"Classification of Different Fritillary by Terahertz Spectroscopy","authors":"Jun Zhou, Zhenzhen Ge, Linbo Zhou, Shuting Wu, Xinmei Xu, Guihua Jiang","doi":"10.1109/UCMMT49983.2020.9296002","DOIUrl":"https://doi.org/10.1109/UCMMT49983.2020.9296002","url":null,"abstract":"In this work, terahertz spectra of four kinds of Fritillaria have been measured by terahertz spectroscopy. Combined with the experiment and the box plot method, the spectral data with large errors were eliminated. The dimension reduction and visualization analysis were carried out by using the t-SNE and LargeVis algorithm, and the distribution of sample data was observed. In the classification analysis of four kinds of Fritillaria, the principal component analysis (PCA) was used to extract data features, and the random forest algorithm and simple four-layer depth neural network were used for multi classification, with an accuracy of 100%.","PeriodicalId":274385,"journal":{"name":"2020 13th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies (UCMMT)","volume":"194 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121887174","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}
K. Guan, B. Ai, Danping He, Fusheng Zhu, Haofan Yi, Jianwu Dou, Z. Zhong
{"title":"Channel Sounding and Ray Tracing for THz Channel Characterization","authors":"K. Guan, B. Ai, Danping He, Fusheng Zhu, Haofan Yi, Jianwu Dou, Z. Zhong","doi":"10.1109/UCMMT49983.2020.9295992","DOIUrl":"https://doi.org/10.1109/UCMMT49983.2020.9295992","url":null,"abstract":"In order to effectively support the design and evaluation of future teraheartz (THz) communications, the fundamental knowledge of the propagation channel characteristics is of paramount significance. In this paper, we introduce a channel characterization method based on ultra-wideband (UWB) channel sounding and ray tracing (RT). As a case study, the channel in intra-wagon scenario at 300 GHz band is characterized through extensive simulations using an RT simulator which is validated by the channel sounding results.","PeriodicalId":274385,"journal":{"name":"2020 13th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies (UCMMT)","volume":"26 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116687632","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}
G. Shu, Xuanyu Chen, Aiguo Sun, Huiling Jiang, Yanyan Tian, Guo Liu, Wenlong He
{"title":"Study of High-order Overmoded Power Couplers for Multiple Sheet Electron Beam Devices","authors":"G. Shu, Xuanyu Chen, Aiguo Sun, Huiling Jiang, Yanyan Tian, Guo Liu, Wenlong He","doi":"10.1109/UCMMT49983.2020.9296036","DOIUrl":"https://doi.org/10.1109/UCMMT49983.2020.9296036","url":null,"abstract":"In this paper, two kinds of high-order overmoded power couplers for multiple sheet electron beam devices are presented. One kind of the couplers was based on coupling apertures, which was response for the mode conversion and power coupling. The other one consisted of a H-plane T-junction based mode converter and an overmoded Y-shaped coupler. To improve the performance, some other auxiliary structures, such as the matching steps, Bragg reflector, were introduced. Both of the two couplers could not only realize the beam wave convergence/separation but also the mode conversion from the fundamental mode to higher-order modes. As examples, two H-band (220–325 GHz) ${text{TE}^{square}}_{20}$ mode power couplers were manufactured by using nano-CNC machining and measured by using a vector network analyzer (VNA). For the first coupler, a 3-dB transmission bandwidth of ∼56.3 GHz (222.2-278.5 GHz) was measured with a maximum transmission coefficient of −4.4 dB and a port reflection of ∼−15.0 dB. For the second coupler, the measured transmission and reflection coefficients were respectively ∼−2.0 dB and ∼−10.0 dB in the frequency range of 250.0-294.0 GHz.","PeriodicalId":274385,"journal":{"name":"2020 13th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies (UCMMT)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115415994","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}
{"title":"A Novel Iterative Method to the Synthesis of Subarrayed Monopulse Linear Arrays","authors":"Chao-Yi Cui, Xin Li, Y. Huang, Yongkang Jiao","doi":"10.1109/UCMMT49983.2020.9296038","DOIUrl":"https://doi.org/10.1109/UCMMT49983.2020.9296038","url":null,"abstract":"In this paper, a novel hybrid iterative method which combines iterative Fourier technique (IFT) with the fuzzy C-means clustering algorithm (FCM) is proposed to synthesize subarrayed monopulse linear arrays. In the synthesis problems, when the sidelobe level objective is achieved, the FCM is integrated into the IFT loops to handle the subarray partition problems. Synthesis of small and large monopulse arrays with different number of subarrays are reported by comparisons with state-of-the-art literatures to demonstrate the effectiveness of the proposed method.","PeriodicalId":274385,"journal":{"name":"2020 13th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies (UCMMT)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127274266","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}
Yuanhao Wang, Qi Yang, Yang Zeng, B. Deng, Hongqiang Wang
{"title":"Radar speech signal enhancement based on modified Compressed Sensing methods","authors":"Yuanhao Wang, Qi Yang, Yang Zeng, B. Deng, Hongqiang Wang","doi":"10.1109/UCMMT49983.2020.9296059","DOIUrl":"https://doi.org/10.1109/UCMMT49983.2020.9296059","url":null,"abstract":"Radar speech signal acquisition based on the millimeter wave radar is proposed to overcome the shortcomings of traditional speech acquisition methods. However, the signal quality is influenced by the device noise and sampling rate. In this paper, modified Compressed Sensing based method is proposed to enhance radar speech signal. Experimental results validate that the proposed method can improve the radar signal quality and reduce the noise.","PeriodicalId":274385,"journal":{"name":"2020 13th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies (UCMMT)","volume":"144 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127300848","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}
Changqing Zhang, Jinjun Feng, Jun Cai, P. Pan, Ye Tang, Siming Su, Jinrui Zhang
{"title":"Design of a G-band Sheet Electron Beam TWT","authors":"Changqing Zhang, Jinjun Feng, Jun Cai, P. Pan, Ye Tang, Siming Su, Jinrui Zhang","doi":"10.1109/UCMMT49983.2020.9296022","DOIUrl":"https://doi.org/10.1109/UCMMT49983.2020.9296022","url":null,"abstract":"The development of the G-band sheet beam TWT with periodic permanent magnet focusing (PCM) is in progress at BVERI. The interaction circuit is based on the staggered double vanes grating slow-wave structure, which is capable of producing >50W power output with a bandwidth over 10GHz according to the PIC simulation. The electron optics for the sheet beam is considered to be the most challenge part in design. The preliminary design of the gun is completed and the results are also presented.","PeriodicalId":274385,"journal":{"name":"2020 13th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies (UCMMT)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126662520","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}
{"title":"Broadband Dual-Polarized Millimeter Wave Antenna Array Using Overlapped Apertures","authors":"Hao Li, Yue Li","doi":"10.1109/UCMMT49983.2020.9296099","DOIUrl":"https://doi.org/10.1109/UCMMT49983.2020.9296099","url":null,"abstract":"In this paper, a dual-polarized (DP) 2-element array with endfire radiation is proposed for 5G millimeter wave (mmW) applications by integrating dipoles on the substrate-integrated waveguide (SIW) horns. Since the SIW horn element is large, in order to reduce the intercept, the antenna array is composed by overlapping two horns' apertures on which four metal vias are placed for enhancements on bandwidth and isolations. Using a small clearance of 1.8mm, the −10-dB impedance bandwidth is wide enough to cover the 5G bands of N257 (26.5∼29.5 GHz) and N258 (24.25∼27.5 GHz) in which the isolations are all higher than 15.8 dB. A maximum gain of 6.47 dBi is achieved for both polarizations. Good agreements have been reached between simulations and measurements, exhibiting a promising potential for portable devices of 5G mmW applications.","PeriodicalId":274385,"journal":{"name":"2020 13th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies (UCMMT)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126367750","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}
{"title":"A Ka-Band Low-Loss SPDT Switch with Gate Floating Technique","authors":"Ling Li, Hao Zhang, Keping Wang","doi":"10.1109/UCMMT49983.2020.9295999","DOIUrl":"https://doi.org/10.1109/UCMMT49983.2020.9295999","url":null,"abstract":"In this paper, a low loss single-pole double-throw switch (SPDT) is presented for Ka-band (32–38 GHz) application. The switch is based on the shunt transistor with an impedance matching network. The gate floating method is used to enhance the power handling capability. Meanwhile, the transistor size is optimized by the tradeoff between the insertion loss and isolation. The measurement results of the proposed SPDT switch show that the insertion loss is less than 2.5 dB, and the isolation is greater than 19 dB across 32–38 GHz. The overall chip size is 0.5 mm2, including RF and DC pads.","PeriodicalId":274385,"journal":{"name":"2020 13th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies (UCMMT)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128304417","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}
{"title":"Robust Transmitted Waveform Design for Millimeter Wave Radar Based on SINR and MI Criteria","authors":"Xu Chen, Qi Yang, B. Deng, Hongqiang Wang","doi":"10.1109/UCMMT49983.2020.9296097","DOIUrl":"https://doi.org/10.1109/UCMMT49983.2020.9296097","url":null,"abstract":"Traditional radar transmitted waveform design algorithms tend to consider that the jamming launched by the jammer can be captured accurately by the radar. However, as the signal components in the environment become more and more complex, the jamming spectrum is not fully known in many practical scenes. In view of this situation, this paper first assumes that the millimeter radar can capture the range of the jamming spectrum, and then determines a jamming spectrum as the most adverse situation to design the robust transmitted waveform by maximizing the signal-to-interference-plus-noise ratio (SINR) and mutual information (MI). Simulation results show that the designed two transmitted waveforms can effectively guarantee the detection and recognition capabilities of the radar.","PeriodicalId":274385,"journal":{"name":"2020 13th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies (UCMMT)","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131426459","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}