Pub Date : 2017-10-01DOI: 10.1109/APCAP.2017.8420970
Z. Chen, Yuanjian Liu, Shuangde Li, Zhong Sheng
The multipath propagation characteristics of ultrawideband (UWB) signal for indoor complex environments is described based on the time domain uniform theory of diffraction (TD-UTD) in this paper. An indoor complex environment with long corridor is established to simulate and analyze the UWB propagation characteristics in indoor environments. In simulation, direct signals, reflection, diffraction and transmission are all considered to analyze UWB signal propagation characteristics through some multipath parameters, such as power delay profile (PDP), electric intensity, root mean square (RMS) delay spread and other parameters. This study can provide the theoretical basis for 5G wireless mobile communication and optimization of UWB signal in indoor complex environments.
{"title":"Simulation and analysis of UWB propagation characteristics in indoor complex environments based on TD-UTD","authors":"Z. Chen, Yuanjian Liu, Shuangde Li, Zhong Sheng","doi":"10.1109/APCAP.2017.8420970","DOIUrl":"https://doi.org/10.1109/APCAP.2017.8420970","url":null,"abstract":"The multipath propagation characteristics of ultrawideband (UWB) signal for indoor complex environments is described based on the time domain uniform theory of diffraction (TD-UTD) in this paper. An indoor complex environment with long corridor is established to simulate and analyze the UWB propagation characteristics in indoor environments. In simulation, direct signals, reflection, diffraction and transmission are all considered to analyze UWB signal propagation characteristics through some multipath parameters, such as power delay profile (PDP), electric intensity, root mean square (RMS) delay spread and other parameters. This study can provide the theoretical basis for 5G wireless mobile communication and optimization of UWB signal in indoor complex environments.","PeriodicalId":367467,"journal":{"name":"2017 Sixth Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129903380","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 : 2017-10-01DOI: 10.1109/APCAP.2017.8420515
X. Bo, Jian Feng Zhang, T. Cui
For numerical simulation of waveguide devices based on finite-difference time-domain method (FDTD), power-to-amplitude transformation (PAT) was proposed to obtain the amplitude of fields corresponding to the specified average input power. However, the previous PAT strategy led to some derivation for multi-carrier because the frequency dependence of wave impedance was omitted. In this article, we propose an accurate and efficient PAT strategy for multi-carrier. The frequency dependence of wave impedance is taken into account by modifying each sinusoidal waveform in multi-carrier. Besides, we discuss how to stimulate the amplitude for waveguide and determine an optimal source excitation strategy in the context of PAT. The effectiveness of the proposed method is verified by a dielectric-loaded waveguide.
{"title":"An optimal power-to-amplitude transformation strategy of multi-carrier for FDTD simulation of waveguide devices","authors":"X. Bo, Jian Feng Zhang, T. Cui","doi":"10.1109/APCAP.2017.8420515","DOIUrl":"https://doi.org/10.1109/APCAP.2017.8420515","url":null,"abstract":"For numerical simulation of waveguide devices based on finite-difference time-domain method (FDTD), power-to-amplitude transformation (PAT) was proposed to obtain the amplitude of fields corresponding to the specified average input power. However, the previous PAT strategy led to some derivation for multi-carrier because the frequency dependence of wave impedance was omitted. In this article, we propose an accurate and efficient PAT strategy for multi-carrier. The frequency dependence of wave impedance is taken into account by modifying each sinusoidal waveform in multi-carrier. Besides, we discuss how to stimulate the amplitude for waveguide and determine an optimal source excitation strategy in the context of PAT. The effectiveness of the proposed method is verified by a dielectric-loaded waveguide.","PeriodicalId":367467,"journal":{"name":"2017 Sixth Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130354320","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 : 2017-10-01DOI: 10.1109/APCAP.2017.8420705
Yaohui Zhang, C. Chen
A compact wideband dual-polarized antenna for LTE base stations is proposed in this paper. Two crossed dipoles are excited by microstrip stubs that are directly fed by two coaxial lines, making the antenna full planar. The width of gap between two pairs of dipoles increases gradually from the center to the edge of the antenna, which improves the impedance characteristic and hence miniaturizes the size of the antennato 45×45mm2. The dual-polarized antenna realizes a wideband impedance bandwidth from 1.7–2.7GHz for return loss >15dB and the isolation of two ports more than 25dB.A stable half-power beamwidth (HPBW) of around 65°on horizontal plane and an average gain of 8.4dBi for slant ±45° polarizations is achieved. In addition, a four-element antenna array is developed.
{"title":"A compact wideband‰45°dual-polarized antenna for lte base stations applications","authors":"Yaohui Zhang, C. Chen","doi":"10.1109/APCAP.2017.8420705","DOIUrl":"https://doi.org/10.1109/APCAP.2017.8420705","url":null,"abstract":"A compact wideband dual-polarized antenna for LTE base stations is proposed in this paper. Two crossed dipoles are excited by microstrip stubs that are directly fed by two coaxial lines, making the antenna full planar. The width of gap between two pairs of dipoles increases gradually from the center to the edge of the antenna, which improves the impedance characteristic and hence miniaturizes the size of the antennato 45×45mm2. The dual-polarized antenna realizes a wideband impedance bandwidth from 1.7–2.7GHz for return loss >15dB and the isolation of two ports more than 25dB.A stable half-power beamwidth (HPBW) of around 65°on horizontal plane and an average gain of 8.4dBi for slant ±45° polarizations is achieved. In addition, a four-element antenna array is developed.","PeriodicalId":367467,"journal":{"name":"2017 Sixth Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130530103","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 : 2017-10-01DOI: 10.1109/APCAP.2017.8420695
Wensheng Zhao, Dawei Wang, Gaofeng Wang, W. Yin
A tunable high-impedance surface (HIS) based on hybrid metal-graphene structure is presented for terahertz (THz) applications. Its tunable properties and relative performance are studied by the proposed LE-FDTD method. At the same time, the equivalent circuit model is derived to give a theoretical explanation. Good performance is obtained in terms of bandwidth, gain, and tunability. The proposed structures are practical and potential for THz applications.
{"title":"A Design of tunable high-impedance surface (HIS) based on hybrid metal-graphene structure","authors":"Wensheng Zhao, Dawei Wang, Gaofeng Wang, W. Yin","doi":"10.1109/APCAP.2017.8420695","DOIUrl":"https://doi.org/10.1109/APCAP.2017.8420695","url":null,"abstract":"A tunable high-impedance surface (HIS) based on hybrid metal-graphene structure is presented for terahertz (THz) applications. Its tunable properties and relative performance are studied by the proposed LE-FDTD method. At the same time, the equivalent circuit model is derived to give a theoretical explanation. Good performance is obtained in terms of bandwidth, gain, and tunability. The proposed structures are practical and potential for THz applications.","PeriodicalId":367467,"journal":{"name":"2017 Sixth Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130578975","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}
In this paper, we establish a generic formula for calculating the circular polarization preservation and conversion rate of metasurfaces based on the Jones matrix method. Specifically, we analyze the polarization state of light reflected from two types of classical metasurfaces: asymmetrical and symmetrical. We also explore the bandwidth of co circular polarization reflectance and the thickness of the dielectric layer. This progress provides useful criteria for designing metasurface-based polarizers.
{"title":"Polarization conversion with asymmetrical and symmetrical metasurface","authors":"Wenlin Zheng, Shiyi Xiao, Shaojie Ma, Yue Li, Weijie Luo, Lei Zhou","doi":"10.1109/APCAP.2017.8420919","DOIUrl":"https://doi.org/10.1109/APCAP.2017.8420919","url":null,"abstract":"In this paper, we establish a generic formula for calculating the circular polarization preservation and conversion rate of metasurfaces based on the Jones matrix method. Specifically, we analyze the polarization state of light reflected from two types of classical metasurfaces: asymmetrical and symmetrical. We also explore the bandwidth of co circular polarization reflectance and the thickness of the dielectric layer. This progress provides useful criteria for designing metasurface-based polarizers.","PeriodicalId":367467,"journal":{"name":"2017 Sixth Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":"45 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124178409","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 : 2017-10-01DOI: 10.1109/APCAP.2017.8420894
Xiaoqiang Li, M. Cai, Wei Shi, Guangli Yang
In this paper, a compact wideband coupler is designed and fabricated between S-Band and C-Band. And a single-antenna radar transceiver utilizing this coupler is proposed. The advantages of the coupler are wideband, compact size, ease of integration and good isolation. Measured and simulated results show that the bandwidth of the coupler is 95% (2.5 to 7.2 GHz) when the port connected to transmitter is excited, and 98% (2.5 to 7.3 GHz) when the port connected to antenna is excited. Also, isolation is more than 20dB over the operating frequencies.
{"title":"A compact wideband coupler for single-antenna microwave radar","authors":"Xiaoqiang Li, M. Cai, Wei Shi, Guangli Yang","doi":"10.1109/APCAP.2017.8420894","DOIUrl":"https://doi.org/10.1109/APCAP.2017.8420894","url":null,"abstract":"In this paper, a compact wideband coupler is designed and fabricated between S-Band and C-Band. And a single-antenna radar transceiver utilizing this coupler is proposed. The advantages of the coupler are wideband, compact size, ease of integration and good isolation. Measured and simulated results show that the bandwidth of the coupler is 95% (2.5 to 7.2 GHz) when the port connected to transmitter is excited, and 98% (2.5 to 7.3 GHz) when the port connected to antenna is excited. Also, isolation is more than 20dB over the operating frequencies.","PeriodicalId":367467,"journal":{"name":"2017 Sixth Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":"112 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124224989","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 : 2017-10-01DOI: 10.1109/APCAP.2017.8420332
Wei Shi, Q. Chu
A method for design of low-profile base-station antennas is proposed by directly height reduction. The method is applied to design a dual-polarized base-station antenna whose height is only 0.11λ at 1.9 GHz with impedance bandwidth of 25.6% for SWR<1.5, stable bandwidth and gain from 1.7 to 2.2 GHz.
{"title":"Design of a low-profile base-station antenna","authors":"Wei Shi, Q. Chu","doi":"10.1109/APCAP.2017.8420332","DOIUrl":"https://doi.org/10.1109/APCAP.2017.8420332","url":null,"abstract":"A method for design of low-profile base-station antennas is proposed by directly height reduction. The method is applied to design a dual-polarized base-station antenna whose height is only 0.11λ at 1.9 GHz with impedance bandwidth of 25.6% for SWR<1.5, stable bandwidth and gain from 1.7 to 2.2 GHz.","PeriodicalId":367467,"journal":{"name":"2017 Sixth Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123316837","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 : 2017-10-01DOI: 10.1109/APCAP.2017.8420383
Wei Sun, Xiaochun Li, Junfa Mao
In this paper, a numerical electromagnetic approach based on weighted Laguerre polynomials finite-difference time-domain (WLP-FDTD) method is proposed to analyze the noise problem in power/ground planes. Compared with the conventional FDTD method, which is limited by Courant-Friedrich-Lecy (CFL) stability condition, the proposed WLP-FDTD-based method has unconditionally stability and hence can reduce time. Analysis of power/ground planes can be reduced from a 3-D problem to a 2-D problem. As an example, a pair of power/ground planes with slots is simulated with the proposed method.
{"title":"Accurate and efficient analysis of power and ground planes based on WLP-FDTD","authors":"Wei Sun, Xiaochun Li, Junfa Mao","doi":"10.1109/APCAP.2017.8420383","DOIUrl":"https://doi.org/10.1109/APCAP.2017.8420383","url":null,"abstract":"In this paper, a numerical electromagnetic approach based on weighted Laguerre polynomials finite-difference time-domain (WLP-FDTD) method is proposed to analyze the noise problem in power/ground planes. Compared with the conventional FDTD method, which is limited by Courant-Friedrich-Lecy (CFL) stability condition, the proposed WLP-FDTD-based method has unconditionally stability and hence can reduce time. Analysis of power/ground planes can be reduced from a 3-D problem to a 2-D problem. As an example, a pair of power/ground planes with slots is simulated with the proposed method.","PeriodicalId":367467,"journal":{"name":"2017 Sixth Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121167715","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 : 2017-10-01DOI: 10.1109/APCAP.2017.8420825
P. Guo, Chufeng Hu, Lifang Guo, Nanjing Li
In order to obtain the electromagnetic scattering of ground surface combining with man-made target. The geometric composite pyramid-ground model is built by the means of digital elevation data superposition method and the faceted element is used to describe the composite model to calculate the electromagnetic scattering. Then the echoes of the composite model are obtained by superimposing the echoes of all the facets. The simulation results show that the feature similarity between the geometric model and the simulation image is consistent. In addition, the fluctuation of the corresponding ground coordinate is also consistent.
{"title":"Electromagnetic scattering of ground surface combining with man-made target: Modeling and simulation","authors":"P. Guo, Chufeng Hu, Lifang Guo, Nanjing Li","doi":"10.1109/APCAP.2017.8420825","DOIUrl":"https://doi.org/10.1109/APCAP.2017.8420825","url":null,"abstract":"In order to obtain the electromagnetic scattering of ground surface combining with man-made target. The geometric composite pyramid-ground model is built by the means of digital elevation data superposition method and the faceted element is used to describe the composite model to calculate the electromagnetic scattering. Then the echoes of the composite model are obtained by superimposing the echoes of all the facets. The simulation results show that the feature similarity between the geometric model and the simulation image is consistent. In addition, the fluctuation of the corresponding ground coordinate is also consistent.","PeriodicalId":367467,"journal":{"name":"2017 Sixth Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114551386","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}
The spoof surface plasmon polaritons (SSPPs) waveguide, as a kind of slow wave structure, can support surface waves whose phase constant is larger than phase constant of waves propagating in free space. By periodically modulating the SSPPs in a simple way, we excite spatial harmonic waves for wide-angle scan. Moreover, theoretical analysis of radiation direction of spatial harmonic waves and simulated radiation patterns are compared. The similarity proves the correctness of the simple method to design leaky wave antennas based on SSPPs.
{"title":"Leaky-wave radiation from periodically modulated spoof surface plasmon polaritons","authors":"Zhixia Xu, X. Zhang, Shunli Li, Hongxin Zhao, Xiaoxing Yin","doi":"10.1109/APCAP.2017.8420399","DOIUrl":"https://doi.org/10.1109/APCAP.2017.8420399","url":null,"abstract":"The spoof surface plasmon polaritons (SSPPs) waveguide, as a kind of slow wave structure, can support surface waves whose phase constant is larger than phase constant of waves propagating in free space. By periodically modulating the SSPPs in a simple way, we excite spatial harmonic waves for wide-angle scan. Moreover, theoretical analysis of radiation direction of spatial harmonic waves and simulated radiation patterns are compared. The similarity proves the correctness of the simple method to design leaky wave antennas based on SSPPs.","PeriodicalId":367467,"journal":{"name":"2017 Sixth Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114637315","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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