Pub Date : 2021-11-28DOI: 10.1109/iwem53379.2021.9790429
Jing-Ying Weng, Xiaojun Bi
This paper proposes an ultra-wideband RF feedback loop including high energy-efficiency invertor structures, which is tailored for silicon-based optoelectronic oscillator (OEO). The proposed RF feedback loop is composed of a wideband transimpedance amplifier, an analog phase shifter and a driver amplifier, which can provide required gain and phase of OEO. The loop achieves a trans-impedance gain of over 75 dBΩ, a tunable phase shift of 360°, an output swing of 0.5-4.5 V and a power consumption of only 143 mW. Furthermore, based on the proposed RF feedback loop, the OEO with a frequency tuning range of 4 GHz to 12 GHz is realized.
{"title":"A Wideband RF Feedback Loop including High Energy-Efficiency Invertor Structures for Silicon-based Optoelectronic Oscillator","authors":"Jing-Ying Weng, Xiaojun Bi","doi":"10.1109/iwem53379.2021.9790429","DOIUrl":"https://doi.org/10.1109/iwem53379.2021.9790429","url":null,"abstract":"This paper proposes an ultra-wideband RF feedback loop including high energy-efficiency invertor structures, which is tailored for silicon-based optoelectronic oscillator (OEO). The proposed RF feedback loop is composed of a wideband transimpedance amplifier, an analog phase shifter and a driver amplifier, which can provide required gain and phase of OEO. The loop achieves a trans-impedance gain of over 75 dBΩ, a tunable phase shift of 360°, an output swing of 0.5-4.5 V and a power consumption of only 143 mW. Furthermore, based on the proposed RF feedback loop, the OEO with a frequency tuning range of 4 GHz to 12 GHz is realized.","PeriodicalId":141204,"journal":{"name":"2021 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122734684","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 : 2021-11-28DOI: 10.1109/iwem53379.2021.9790528
Qi-Fa Zhou, Lu Guo
In this article, a dual-polarized unit-cell for wideband refletarrays is presented. By tuning the slot length of the structure, a linear phase for both polarizations can be achieved. An offset-fed reflectarray containing 506 proposed elements for each polarization is designed. Simulations exhibit that the reflectarray antenna features a wide 1-dB gain bandwidth of 32% and 31% for horizontal and vertical polarization, respectively. Satisfactory sidelobe and cross-polarization behavior is also obtained for both polarizations.
{"title":"Design of A Dual-Polarized Unit-Cell for Wideband Reflectarrays","authors":"Qi-Fa Zhou, Lu Guo","doi":"10.1109/iwem53379.2021.9790528","DOIUrl":"https://doi.org/10.1109/iwem53379.2021.9790528","url":null,"abstract":"In this article, a dual-polarized unit-cell for wideband refletarrays is presented. By tuning the slot length of the structure, a linear phase for both polarizations can be achieved. An offset-fed reflectarray containing 506 proposed elements for each polarization is designed. Simulations exhibit that the reflectarray antenna features a wide 1-dB gain bandwidth of 32% and 31% for horizontal and vertical polarization, respectively. Satisfactory sidelobe and cross-polarization behavior is also obtained for both polarizations.","PeriodicalId":141204,"journal":{"name":"2021 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122797974","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 : 2021-11-28DOI: 10.1109/iwem53379.2021.9790372
Jingtao Zeng, Kun Huang, Shi-wo Ta
This paper presents the design of a miniaturized low-pass filter embedded in LTCC (low-temperature co-fired ceramic) substrate. A low-pass filter used in wireless communication system with 9500 MHz cut-off frequency and 3dB insertion loss was designed based on LC resonator components. The simulation result shows that the attenuation is more than 30 dB in the stopband and the insertion loss in the passband is about 3dB . The size of the filter is 3.2mm X 1.6mm X 0.95mm. A basic guidelines is shown for the design. A sixth-order filter is fabricated for verification.
本文介绍了一种嵌入低温共烧陶瓷衬底的小型化低通滤波器的设计。基于LC谐振元件设计了一种截止频率为9500 MHz、插入损耗为3dB的无线通信低通滤波器。仿真结果表明，阻带内的衰减大于30 dB，通带内的插入损耗约为3dB。过滤器尺寸为3.2mm X 1.6mm X 0.95mm。给出了设计的基本准则。制作了一个六阶滤波器进行验证。
{"title":"A LC Resonator Based Low-pass Filter Embedded in LTCC Substrate","authors":"Jingtao Zeng, Kun Huang, Shi-wo Ta","doi":"10.1109/iwem53379.2021.9790372","DOIUrl":"https://doi.org/10.1109/iwem53379.2021.9790372","url":null,"abstract":"This paper presents the design of a miniaturized low-pass filter embedded in LTCC (low-temperature co-fired ceramic) substrate. A low-pass filter used in wireless communication system with 9500 MHz cut-off frequency and 3dB insertion loss was designed based on LC resonator components. The simulation result shows that the attenuation is more than 30 dB in the stopband and the insertion loss in the passband is about 3dB . The size of the filter is 3.2mm X 1.6mm X 0.95mm. A basic guidelines is shown for the design. A sixth-order filter is fabricated for verification.","PeriodicalId":141204,"journal":{"name":"2021 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"170 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123846706","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 : 2021-11-28DOI: 10.1109/iwem53379.2021.9790521
Heng-hua Cao, Jianing Cao, Q. Ren
The coating of radar absorbing material can reduce radar cross section of aircrafts significantly, it’s indeed necessary to analyze their electromagnetic scattering characteristics. The traditional method requires plenty of time thus can’t meet the need of real-time analysis. To solve this problem, this paper proposed an image-to-image deep neural network based on U-net with residual unit. This network can predict the ISAR image for a coated target with random defect. The well-trained network can accelerate the speed by five orders while ensuring a relative error lower than 0.28%. The numerical results are exhibited to prove that the proposed method is of great efficiency and accuracy compared to the traditional method.
{"title":"A Method to Obtain Deep Neural Network for Predicting ISAR Images of Coted Targets with Defect","authors":"Heng-hua Cao, Jianing Cao, Q. Ren","doi":"10.1109/iwem53379.2021.9790521","DOIUrl":"https://doi.org/10.1109/iwem53379.2021.9790521","url":null,"abstract":"The coating of radar absorbing material can reduce radar cross section of aircrafts significantly, it’s indeed necessary to analyze their electromagnetic scattering characteristics. The traditional method requires plenty of time thus can’t meet the need of real-time analysis. To solve this problem, this paper proposed an image-to-image deep neural network based on U-net with residual unit. This network can predict the ISAR image for a coated target with random defect. The well-trained network can accelerate the speed by five orders while ensuring a relative error lower than 0.28%. The numerical results are exhibited to prove that the proposed method is of great efficiency and accuracy compared to the traditional method.","PeriodicalId":141204,"journal":{"name":"2021 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124010649","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 : 2021-11-28DOI: 10.1109/iwem53379.2021.9790447
Zhao Xing, Huihua Liu, Yunqiu Wu, Yi-ming Yu, Chenxi Zhao, K. Kang
A wide-band divide-by-2 injection-locked frequency divider (ILFD) based on a dual-resonance high-order tank is presented. The ILFD employs a distributed LC network as the dual resonance tank, and achieves an ultra-wide locking range. Fabricated in 1P7M 65 nm LP-CMOS process, the divide-by-2 ILFD consumes 7 mW from a 0.7V power supply, and realized a locking range of 87.0%, from 13 GHz to 33 GHz. The core circuit occupies an area of 0.22 mm×0.5 mm.
{"title":"A Wide-Band Divide-By-2 Injection-Locked Frequency Divider Based on Dual-Resonance Tank","authors":"Zhao Xing, Huihua Liu, Yunqiu Wu, Yi-ming Yu, Chenxi Zhao, K. Kang","doi":"10.1109/iwem53379.2021.9790447","DOIUrl":"https://doi.org/10.1109/iwem53379.2021.9790447","url":null,"abstract":"A wide-band divide-by-2 injection-locked frequency divider (ILFD) based on a dual-resonance high-order tank is presented. The ILFD employs a distributed LC network as the dual resonance tank, and achieves an ultra-wide locking range. Fabricated in 1P7M 65 nm LP-CMOS process, the divide-by-2 ILFD consumes 7 mW from a 0.7V power supply, and realized a locking range of 87.0%, from 13 GHz to 33 GHz. The core circuit occupies an area of 0.22 mm×0.5 mm.","PeriodicalId":141204,"journal":{"name":"2021 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124230044","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}
Accurate phase coding is a key to meet the demand of practical problems for digital metamaterials. In this work, we propose a novel phase coding method based on convex optimization for digital metamaterials. A general nonconvex problem of metamaterials beam synthesis is reformulated into a convex optimization problem. The quasi-Newton optimization method is used to obtain the solution of the convex optimization problem. Then a shortest-distance discretization method maps the obtained solution into a selectable phase. A digital metamaterials example is presented to demonstrate the performance of the proposed method in comparison with conventional genetic algorithm.
{"title":"Phase Coding Framework of Digital Metamaterials Based on Convex Optimization","authors":"Zhen Zhang, Junwei Zhang, Junwei Wu, Q. Cheng, Q. Cheng","doi":"10.1109/iwem53379.2021.9790523","DOIUrl":"https://doi.org/10.1109/iwem53379.2021.9790523","url":null,"abstract":"Accurate phase coding is a key to meet the demand of practical problems for digital metamaterials. In this work, we propose a novel phase coding method based on convex optimization for digital metamaterials. A general nonconvex problem of metamaterials beam synthesis is reformulated into a convex optimization problem. The quasi-Newton optimization method is used to obtain the solution of the convex optimization problem. Then a shortest-distance discretization method maps the obtained solution into a selectable phase. A digital metamaterials example is presented to demonstrate the performance of the proposed method in comparison with conventional genetic algorithm.","PeriodicalId":141204,"journal":{"name":"2021 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125759939","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 : 2021-11-28DOI: 10.1109/iwem53379.2021.9790647
Junyi Shen, S. Liao, W. Che, Q. Xue
This paper presents a low radar cross-section (RCS) dual-band dual-polarized antenna designed based on absorptive frequency-selective reflector (AFSR). The AFSR is composed of a dual-band dual-polarized bandstop frequency selective structure (FSS) and an absorber under the FSS. The bandstop FSS element is designed using cross-frame and square ring to realize dual-band dual-polarized operation. The reflection frequency band of AFSR coincides with the operation band of the antenna. The simulation results indicate that the AFSR-backed antenna system has a remarkable reduction of out-of-band RCS and relatively consistent radiation performance compared with the PEC-backed antenna.
{"title":"A Low-RCS Dual-band Dual-polarized Antenna Based on Absorptive Frequency-Selective Reflector","authors":"Junyi Shen, S. Liao, W. Che, Q. Xue","doi":"10.1109/iwem53379.2021.9790647","DOIUrl":"https://doi.org/10.1109/iwem53379.2021.9790647","url":null,"abstract":"This paper presents a low radar cross-section (RCS) dual-band dual-polarized antenna designed based on absorptive frequency-selective reflector (AFSR). The AFSR is composed of a dual-band dual-polarized bandstop frequency selective structure (FSS) and an absorber under the FSS. The bandstop FSS element is designed using cross-frame and square ring to realize dual-band dual-polarized operation. The reflection frequency band of AFSR coincides with the operation band of the antenna. The simulation results indicate that the AFSR-backed antenna system has a remarkable reduction of out-of-band RCS and relatively consistent radiation performance compared with the PEC-backed antenna.","PeriodicalId":141204,"journal":{"name":"2021 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129817679","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 : 2021-11-28DOI: 10.1109/iWEM53379.2021.9790693
Balin Ye, Kunpeng Yuan, Dongxu Jiang, Enkai Liu
In this paper, a time-varying model of rolling waves is established for broken waves, the electromagnetic backscattering coefficients of rolling waves are calculated, and the difference in monostatic electromagnetic scattering in different periods of the formation of rolling waves is discussed. The research is of great significance for electronic reconnaissance to identify and sort sea targets more effectively.
{"title":"Research on Monostatic Electromagnetic Scattering of Rolling Waves","authors":"Balin Ye, Kunpeng Yuan, Dongxu Jiang, Enkai Liu","doi":"10.1109/iWEM53379.2021.9790693","DOIUrl":"https://doi.org/10.1109/iWEM53379.2021.9790693","url":null,"abstract":"In this paper, a time-varying model of rolling waves is established for broken waves, the electromagnetic backscattering coefficients of rolling waves are calculated, and the difference in monostatic electromagnetic scattering in different periods of the formation of rolling waves is discussed. The research is of great significance for electronic reconnaissance to identify and sort sea targets more effectively.","PeriodicalId":141204,"journal":{"name":"2021 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"volume1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129854286","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}
This paper presents a design of 23-34 GHz wideband low-noise amplifier (LNA) based on gallium-nitride (GaN) technology. The LNA circuit employs an input matching network with few components and particularly reduces the noise of the second stage at the high frequency, which makes the circuit achieve sub-1dB noise performance in the whole bandwidth, while completing noise and impedance matching. Because inductive peaking technique and stagger tuning technique are adopted, the small-signal gain of the LNA is from 22.1 dB to 25.2 dB over the whole bandwidth. With 30.9 dBm maximum output-referred third-order intercept point (OIP3) and 42 dBm maximum input power (Pin,max), the LNA also achieves high linearity and high reliability.
{"title":"A 23-34 GHz Wideband GaN Low-Noise Amplifier for 5G Millimeter-Wave Applications","authors":"Yubin Li, Xueying Wu, Jun Hu, Xiuyin Zhang, Yun Yin, Hongtao Xu","doi":"10.1109/iwem53379.2021.9790567","DOIUrl":"https://doi.org/10.1109/iwem53379.2021.9790567","url":null,"abstract":"This paper presents a design of 23-34 GHz wideband low-noise amplifier (LNA) based on gallium-nitride (GaN) technology. The LNA circuit employs an input matching network with few components and particularly reduces the noise of the second stage at the high frequency, which makes the circuit achieve sub-1dB noise performance in the whole bandwidth, while completing noise and impedance matching. Because inductive peaking technique and stagger tuning technique are adopted, the small-signal gain of the LNA is from 22.1 dB to 25.2 dB over the whole bandwidth. With 30.9 dBm maximum output-referred third-order intercept point (OIP3) and 42 dBm maximum input power (Pin,max), the LNA also achieves high linearity and high reliability.","PeriodicalId":141204,"journal":{"name":"2021 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128553756","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 : 2021-11-28DOI: 10.1109/iwem53379.2021.9790494
Chuanwei Ding, Jiaming Yan, Hong Hong, Xiaohua Zhu
Due to the aging population, fall detection is crucial for elderly health care and assisted living. Radar-based methods attract much attention for its potential for high accuracy, robustness, and privacy preservation. In this paper, sparsity-based feature extraction methods are proposed to extract robust time-Doppler features with physical meanings for the classification of fall and fall-similar motions. First, sparse representation theory is introduced and through Gabor-based sparse dictionary, sparse representation of the received signals can be achieved in time-Doppler domain. Then, corresponding sparse point maps consisting of a series of sparse solutions are obtained by OMP-based algorithm. Particularly, reconstructed signals can be utilized to demonstrate that sparse features preserve most information from original ones while ignoring noise interferences. Finally, experiments have been conducted to show its feasibility by achieving an average accuracy of 95% on fall detection.
{"title":"Sparsity-based Feature Extraction in Fall Detection with a Portable FMCW Radar","authors":"Chuanwei Ding, Jiaming Yan, Hong Hong, Xiaohua Zhu","doi":"10.1109/iwem53379.2021.9790494","DOIUrl":"https://doi.org/10.1109/iwem53379.2021.9790494","url":null,"abstract":"Due to the aging population, fall detection is crucial for elderly health care and assisted living. Radar-based methods attract much attention for its potential for high accuracy, robustness, and privacy preservation. In this paper, sparsity-based feature extraction methods are proposed to extract robust time-Doppler features with physical meanings for the classification of fall and fall-similar motions. First, sparse representation theory is introduced and through Gabor-based sparse dictionary, sparse representation of the received signals can be achieved in time-Doppler domain. Then, corresponding sparse point maps consisting of a series of sparse solutions are obtained by OMP-based algorithm. Particularly, reconstructed signals can be utilized to demonstrate that sparse features preserve most information from original ones while ignoring noise interferences. Finally, experiments have been conducted to show its feasibility by achieving an average accuracy of 95% on fall detection.","PeriodicalId":141204,"journal":{"name":"2021 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124524750","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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