Pub Date : 2020-08-04DOI: 10.1109/APCAP50217.2020.9245941
B. Yao, Q. H. Zheng, Y. Liu, J. Qi, J. Wang
The 5G communications provide the possibility to precise control the microwave reactors in industry. In this paper, we proposed a sealed low profile 5G resonant slot antenna which operates in 5G communication band (4.8-4.9 GHz) of China Mobile. The proposed antenna is dust prevention, 0.915/2.45 GHz avoiding, and not easily to broken by accidental collision. Therefore, it is suitable to equip on industry microwave reactors.
{"title":"A Low Profile 5G Slot Antenna for Microwave Reactor Communication*","authors":"B. Yao, Q. H. Zheng, Y. Liu, J. Qi, J. Wang","doi":"10.1109/APCAP50217.2020.9245941","DOIUrl":"https://doi.org/10.1109/APCAP50217.2020.9245941","url":null,"abstract":"The 5G communications provide the possibility to precise control the microwave reactors in industry. In this paper, we proposed a sealed low profile 5G resonant slot antenna which operates in 5G communication band (4.8-4.9 GHz) of China Mobile. The proposed antenna is dust prevention, 0.915/2.45 GHz avoiding, and not easily to broken by accidental collision. Therefore, it is suitable to equip on industry microwave reactors.","PeriodicalId":146561,"journal":{"name":"2020 9th Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116917000","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 : 2020-08-04DOI: 10.1109/APCAP50217.2020.9245974
Ren-Jiang Zhu, Li-xin Guo, Zhongyu Liu
On the basis of the propagation characteristics of electromagnetic wave attenuation, reflection, and diffraction, a imaging algorithm with an envelope of ellipses is proposed to obtain the image of the building geometry structure. The ellipse model regarding a target is established by analyzing the geometry relationship between the target and the coordinates of transceiver. With this model, it can get better imaging results using the echo delay.
{"title":"Building Structure Imaging Algorithm with an Envelope of Ellipses based Multipath","authors":"Ren-Jiang Zhu, Li-xin Guo, Zhongyu Liu","doi":"10.1109/APCAP50217.2020.9245974","DOIUrl":"https://doi.org/10.1109/APCAP50217.2020.9245974","url":null,"abstract":"On the basis of the propagation characteristics of electromagnetic wave attenuation, reflection, and diffraction, a imaging algorithm with an envelope of ellipses is proposed to obtain the image of the building geometry structure. The ellipse model regarding a target is established by analyzing the geometry relationship between the target and the coordinates of transceiver. With this model, it can get better imaging results using the echo delay.","PeriodicalId":146561,"journal":{"name":"2020 9th Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121990588","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 : 2020-08-04DOI: 10.1109/APCAP50217.2020.9246088
Qiushi Yu, Yue Guan, Yucheng Yu, Chao Yu
In this paper, a back propagation (BP) neural network (NN) based on genetic algorithm (GA) optimization is presented to characterize the physical properties of wideband radio frequency (RF) power amplifiers (PAs) with 5G new radio (NR) test. Taking the weight and bias matrices of neurons inside the BP NN as hyper-parameters, the initial parameters are optimized by iterative calculations of genetic algorithm to solve the problem that BP neural network is prone to fall into local optimal solutions, significantly improving the probability to achieve the best modeling accuracy of RF PAs. The experimental results show that the proposed model achieves higher modeling performance compared with the existing one.
{"title":"Genetic Algorithm Optimized Back Propagation Neural Networks in Behavioral Modeling of Power Amplifiers Excited by 5G NR Signal","authors":"Qiushi Yu, Yue Guan, Yucheng Yu, Chao Yu","doi":"10.1109/APCAP50217.2020.9246088","DOIUrl":"https://doi.org/10.1109/APCAP50217.2020.9246088","url":null,"abstract":"In this paper, a back propagation (BP) neural network (NN) based on genetic algorithm (GA) optimization is presented to characterize the physical properties of wideband radio frequency (RF) power amplifiers (PAs) with 5G new radio (NR) test. Taking the weight and bias matrices of neurons inside the BP NN as hyper-parameters, the initial parameters are optimized by iterative calculations of genetic algorithm to solve the problem that BP neural network is prone to fall into local optimal solutions, significantly improving the probability to achieve the best modeling accuracy of RF PAs. The experimental results show that the proposed model achieves higher modeling performance compared with the existing one.","PeriodicalId":146561,"journal":{"name":"2020 9th Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126013689","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 : 2020-08-04DOI: 10.1109/APCAP50217.2020.9246060
Quansheng Li, Zhongyu Liu, Li-xin Guo
In order to find the best wireless communication technology scheme for the wireless channel environment between ships on the sea surface, this paper presents a communication model for multipath between ships on the surface of the sea based on the ray tracing algorithm. The multipath model presented herein covers the direct and specular reflection and the diffuse components. In this paper, large-scale fading analyses on wireless channel of ship-to-ship communication are presented.
{"title":"A Maritime Multipath Wireless Channel Model Based on Ray Tracing Algorithm","authors":"Quansheng Li, Zhongyu Liu, Li-xin Guo","doi":"10.1109/APCAP50217.2020.9246060","DOIUrl":"https://doi.org/10.1109/APCAP50217.2020.9246060","url":null,"abstract":"In order to find the best wireless communication technology scheme for the wireless channel environment between ships on the sea surface, this paper presents a communication model for multipath between ships on the surface of the sea based on the ray tracing algorithm. The multipath model presented herein covers the direct and specular reflection and the diffuse components. In this paper, large-scale fading analyses on wireless channel of ship-to-ship communication are presented.","PeriodicalId":146561,"journal":{"name":"2020 9th Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124855074","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}
A novel direction finding method based on spatial spectrum estimation is proposed and verified with time modulated linear array (TMLA). Because of time modulation, harmonic components are generated in each element. Then, they are added together by a power combiner. Utilizing a single RF channel, the autocorrelation matrix can be estimated from the harmonic spectrum of the received signal. Then multiple signal classification (MUSIC) algorithm can be applied to estimate the direction of arrival (DOA). The proposed method can significantly reduce the complexity and cost of existing methods. Numeric simulations are provided to verify its effectiveness.
{"title":"Direction Finding Based on Spatial Spectrum Estimation with Time-Modulated Linear Array","authors":"Xingbang Jiang, Jingfeng Chen, Chong He, Guanli Yi, Yongmin Shuai","doi":"10.1109/APCAP50217.2020.9246062","DOIUrl":"https://doi.org/10.1109/APCAP50217.2020.9246062","url":null,"abstract":"A novel direction finding method based on spatial spectrum estimation is proposed and verified with time modulated linear array (TMLA). Because of time modulation, harmonic components are generated in each element. Then, they are added together by a power combiner. Utilizing a single RF channel, the autocorrelation matrix can be estimated from the harmonic spectrum of the received signal. Then multiple signal classification (MUSIC) algorithm can be applied to estimate the direction of arrival (DOA). The proposed method can significantly reduce the complexity and cost of existing methods. Numeric simulations are provided to verify its effectiveness.","PeriodicalId":146561,"journal":{"name":"2020 9th Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129993622","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 : 2020-08-04DOI: 10.1109/APCAP50217.2020.9245953
Xiangrui Bu, Weifeng Liu
Wide-band coaxial switch is widely used for transmitting and switching signal in automatic test system and test instruments due to its low insertion loss, bandwidth, and long life. As a kind of microwave switch, matrix switch has 6 RF input and output terminals, which feature is that any two ports can be connected to each other. Thus, the central conductor of the edge line must be cut into six wedges, resulting in an increase in the discontinuity of the coaxial transition to the edge-line. In this paper, a new design of matrix switch is investigated, which has three transmission modes, so it can flexibly transmit microwave signal. The switch can transmit signals all the way down to dc, with the highest frequency is available up to 40 GHz. In this manuscript, the whole structure, key designs, and measured results of this new matrix switch is demonstrated [1]-[3].
{"title":"The design of a wide-band Matrix Coaxial Switch","authors":"Xiangrui Bu, Weifeng Liu","doi":"10.1109/APCAP50217.2020.9245953","DOIUrl":"https://doi.org/10.1109/APCAP50217.2020.9245953","url":null,"abstract":"Wide-band coaxial switch is widely used for transmitting and switching signal in automatic test system and test instruments due to its low insertion loss, bandwidth, and long life. As a kind of microwave switch, matrix switch has 6 RF input and output terminals, which feature is that any two ports can be connected to each other. Thus, the central conductor of the edge line must be cut into six wedges, resulting in an increase in the discontinuity of the coaxial transition to the edge-line. In this paper, a new design of matrix switch is investigated, which has three transmission modes, so it can flexibly transmit microwave signal. The switch can transmit signals all the way down to dc, with the highest frequency is available up to 40 GHz. In this manuscript, the whole structure, key designs, and measured results of this new matrix switch is demonstrated [1]-[3].","PeriodicalId":146561,"journal":{"name":"2020 9th Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130261617","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 : 2020-08-04DOI: 10.1109/APCAP50217.2020.9245963
Ming Yang, N. Xie, Chao Liu, Jinghong Yang
An S-band high power microwave generation and radiation system with a center frequency of 2856 MHz based on conventional high power klystron and rectangular helical array antenna fed from a radial waveguide has been fabricated and tested for both high average power and high peak power requirements. The klystron providing a peak power of 50 MW can run stably at modest repetitive pulse in pulse durations of several microseconds level, especially with good phase stability suited to power combining. The helical array antenna is composed of 16×16 helixes used as radiation elements. A radial line power divider using probe coupling is adopted to realize the equal-amplitude in-phase multiport power division of the high power microwave from the klystron.
{"title":"An HPM System Based on Klystron and Radial Line Helical Array Antenna","authors":"Ming Yang, N. Xie, Chao Liu, Jinghong Yang","doi":"10.1109/APCAP50217.2020.9245963","DOIUrl":"https://doi.org/10.1109/APCAP50217.2020.9245963","url":null,"abstract":"An S-band high power microwave generation and radiation system with a center frequency of 2856 MHz based on conventional high power klystron and rectangular helical array antenna fed from a radial waveguide has been fabricated and tested for both high average power and high peak power requirements. The klystron providing a peak power of 50 MW can run stably at modest repetitive pulse in pulse durations of several microseconds level, especially with good phase stability suited to power combining. The helical array antenna is composed of 16×16 helixes used as radiation elements. A radial line power divider using probe coupling is adopted to realize the equal-amplitude in-phase multiport power division of the high power microwave from the klystron.","PeriodicalId":146561,"journal":{"name":"2020 9th Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131678223","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 : 2020-08-04DOI: 10.1109/APCAP50217.2020.9246094
Bin Li, Yike Qiu, Jin-ping Zhang, Zhipeng Zhou, Lei Sun
A W-band series-fed microstrip patch array based on an optimization of tapering profile is proposed in the article. The proposed array is composed of 16 series-fed radiating patches. Dimensions of these microstrip patches are optimized to generate an array pattern with low sidelobes. The optimization procedure about the patch width tapering is performed by using the differential evolution (DE) algorithm. The post-optimized model is investigated in a three-dimensional full-wave simulator. Simulation results show that the sidelobe level of the series-fed array is below -23.8 dB. In addition, the voltage standing wave ratio (VSWR) in the operation frequency range 92 ~ 98 GHz is below 1.65.
{"title":"W-band Series-fed Microstrip Patch Array with Optimization of Tapering Profile","authors":"Bin Li, Yike Qiu, Jin-ping Zhang, Zhipeng Zhou, Lei Sun","doi":"10.1109/APCAP50217.2020.9246094","DOIUrl":"https://doi.org/10.1109/APCAP50217.2020.9246094","url":null,"abstract":"A W-band series-fed microstrip patch array based on an optimization of tapering profile is proposed in the article. The proposed array is composed of 16 series-fed radiating patches. Dimensions of these microstrip patches are optimized to generate an array pattern with low sidelobes. The optimization procedure about the patch width tapering is performed by using the differential evolution (DE) algorithm. The post-optimized model is investigated in a three-dimensional full-wave simulator. Simulation results show that the sidelobe level of the series-fed array is below -23.8 dB. In addition, the voltage standing wave ratio (VSWR) in the operation frequency range 92 ~ 98 GHz is below 1.65.","PeriodicalId":146561,"journal":{"name":"2020 9th Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126249268","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 : 2020-08-04DOI: 10.1109/APCAP50217.2020.9246002
Ye Zhao, Nianzu Zhang, W. Hong
Wireless channel emulation is becoming increasingly important where system performance highly depend on the accurate representation of channel conditions. This paper presents the design and implementation of a wireless channel emulation method with variable bandwidth and high precision delay. The proposed emulation method consists of integer delay, fractional delay and amplitude fading process. In particular, this method applies a variable bandwidth and fractional delay filter that improves the accuracy and convenience of channel emulation compared with conventional channel emulation. A computational complexity analysis is performed to compare the performance of different implement structures.
{"title":"Wireless Channel Emulation Method With Variable Bandwidth and High Precision Delay","authors":"Ye Zhao, Nianzu Zhang, W. Hong","doi":"10.1109/APCAP50217.2020.9246002","DOIUrl":"https://doi.org/10.1109/APCAP50217.2020.9246002","url":null,"abstract":"Wireless channel emulation is becoming increasingly important where system performance highly depend on the accurate representation of channel conditions. This paper presents the design and implementation of a wireless channel emulation method with variable bandwidth and high precision delay. The proposed emulation method consists of integer delay, fractional delay and amplitude fading process. In particular, this method applies a variable bandwidth and fractional delay filter that improves the accuracy and convenience of channel emulation compared with conventional channel emulation. A computational complexity analysis is performed to compare the performance of different implement structures.","PeriodicalId":146561,"journal":{"name":"2020 9th Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114073361","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 : 2020-08-04DOI: 10.1109/APCAP50217.2020.9246041
Bin Mao, G. Hua
In this paper, a novel wideband unidirectional antenna composed of a shorted bowtie patch antenna and a printed dipole is proposed. A shorted bowtie patch antenna that works as a magnetic dipole and a printed dipole are connected together and excited simultaneously by an air microstrip line. By adding a pair of parasitic patches above the printed dipole, the bandwidth of the antenna is broadened. A U-shaped reflector is employed to achieve stable gain and radiation patterns over the operating frequencies. Measurement results show that an impedance bandwidth of 84.7% for SWR ≤ 2 from 2.09 to 5.16 GHz is achieved. Stable radiation pattern with low cross polarization, low back radiation and an antenna gain of 9±2.2dBi was found over the operating frequencies.
{"title":"A Novel Wideband Unidirectional Antenna Composed of a Shorted Bowtie Patch Antenna and a Printed Dipole","authors":"Bin Mao, G. Hua","doi":"10.1109/APCAP50217.2020.9246041","DOIUrl":"https://doi.org/10.1109/APCAP50217.2020.9246041","url":null,"abstract":"In this paper, a novel wideband unidirectional antenna composed of a shorted bowtie patch antenna and a printed dipole is proposed. A shorted bowtie patch antenna that works as a magnetic dipole and a printed dipole are connected together and excited simultaneously by an air microstrip line. By adding a pair of parasitic patches above the printed dipole, the bandwidth of the antenna is broadened. A U-shaped reflector is employed to achieve stable gain and radiation patterns over the operating frequencies. Measurement results show that an impedance bandwidth of 84.7% for SWR ≤ 2 from 2.09 to 5.16 GHz is achieved. Stable radiation pattern with low cross polarization, low back radiation and an antenna gain of 9±2.2dBi was found over the operating frequencies.","PeriodicalId":146561,"journal":{"name":"2020 9th Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116082918","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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