Pub Date : 2018-08-01DOI: 10.1109/APCAP.2018.8538232
W. Zhai, Yunhua Zhang, Guo Li
We introduce the derivation and validation of the echo waveform model (EWM) for the ChineseTiangong-2 interferometric imaging radar altimeter (TG2-InIRA), which was launched on Sept. 152016. The TG2-InIRA adopts small incident angles from 1 to 8 degree and short interferometric baseline of 2.3m so as to realize high coherency measurement of radar scattering from sea surface aiming to retrieve three- dimensional ocean topography with centimeter-level accuracy. We derived the EWM by multiplication of the antenna pattern in range direction, the backscattering coefficient model and the system response function. Real in-orbit observation data has been used to validate the developed EWM and an initial wind speed retrieval algorithm is proposed.
{"title":"Derivation and Validation of the Echo Waveform for the Chinese Tiangong-2 Interferometric Imaging Radar Altimeter","authors":"W. Zhai, Yunhua Zhang, Guo Li","doi":"10.1109/APCAP.2018.8538232","DOIUrl":"https://doi.org/10.1109/APCAP.2018.8538232","url":null,"abstract":"We introduce the derivation and validation of the echo waveform model (EWM) for the ChineseTiangong-2 interferometric imaging radar altimeter (TG2-InIRA), which was launched on Sept. 152016. The TG2-InIRA adopts small incident angles from 1 to 8 degree and short interferometric baseline of 2.3m so as to realize high coherency measurement of radar scattering from sea surface aiming to retrieve three- dimensional ocean topography with centimeter-level accuracy. We derived the EWM by multiplication of the antenna pattern in range direction, the backscattering coefficient model and the system response function. Real in-orbit observation data has been used to validate the developed EWM and an initial wind speed retrieval algorithm is proposed.","PeriodicalId":198124,"journal":{"name":"2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129476496","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 : 2018-08-01DOI: 10.1109/APCAP.2018.8538038
K. Eccleston, I. Platt, E.-C. Adrian Tan, I. Woodhead
Radar imagery of grape bunches of various sizes demonstrate optical region scattering in the 2 to 4 GHz band. Simulations in this band demonstrate that leaves are virtually transparent compared to the grape bunches and this allows the radar to detect bunches on a vine when obscured by leaves.
{"title":"Wave Interaction with Grape Bunches on Vines","authors":"K. Eccleston, I. Platt, E.-C. Adrian Tan, I. Woodhead","doi":"10.1109/APCAP.2018.8538038","DOIUrl":"https://doi.org/10.1109/APCAP.2018.8538038","url":null,"abstract":"Radar imagery of grape bunches of various sizes demonstrate optical region scattering in the 2 to 4 GHz band. Simulations in this band demonstrate that leaves are virtually transparent compared to the grape bunches and this allows the radar to detect bunches on a vine when obscured by leaves.","PeriodicalId":198124,"journal":{"name":"2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127046404","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 : 2018-08-01DOI: 10.1109/APCAP.2018.8538306
S. Aikawa, Shinichiro Yamamoto, M. Morimoto
Navigation applications for smartphones are poplar system, recently. Especially, WLAN Finger Print technique is suitable for indoor environment where GPS is difficult to use. This contribution describes a Finger Print Localization scheme using Deep Learning technique. First, the principle and experimental results of Finger Print using Deep Learning are described. Second, Coarse-to-Fine Localization based on SOM is proposed. A scheme to guess ahead accuracy for WLAN/GPS switching is described in the last section.
{"title":"WLAN Finger Print Localization using Deep Learning","authors":"S. Aikawa, Shinichiro Yamamoto, M. Morimoto","doi":"10.1109/APCAP.2018.8538306","DOIUrl":"https://doi.org/10.1109/APCAP.2018.8538306","url":null,"abstract":"Navigation applications for smartphones are poplar system, recently. Especially, WLAN Finger Print technique is suitable for indoor environment where GPS is difficult to use. This contribution describes a Finger Print Localization scheme using Deep Learning technique. First, the principle and experimental results of Finger Print using Deep Learning are described. Second, Coarse-to-Fine Localization based on SOM is proposed. A scheme to guess ahead accuracy for WLAN/GPS switching is described in the last section.","PeriodicalId":198124,"journal":{"name":"2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124265532","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 : 2018-08-01DOI: 10.1109/APCAP.2018.8538109
Boya Zhang, Zhengjun Li
This paper introduces the design and simulation of a broadband circularly polarized microstrip patch antenna. The antenna consists of a circular patch, an air layer and four Lprobes. The distance between the patch and ground is only 0.058 times of the free space wavelength at 0.25GHz, achieving low profile characteristic. The HFSS simulation results show that VSWR is better than 2 in 42.2% bandwidth, the axial ratio is less than 1.5dB, and the antenna peak gain is 10.6dBi.
{"title":"A Low Profile Broadband Circularly Polarized Microstrip Antenna","authors":"Boya Zhang, Zhengjun Li","doi":"10.1109/APCAP.2018.8538109","DOIUrl":"https://doi.org/10.1109/APCAP.2018.8538109","url":null,"abstract":"This paper introduces the design and simulation of a broadband circularly polarized microstrip patch antenna. The antenna consists of a circular patch, an air layer and four Lprobes. The distance between the patch and ground is only 0.058 times of the free space wavelength at 0.25GHz, achieving low profile characteristic. The HFSS simulation results show that VSWR is better than 2 in 42.2% bandwidth, the axial ratio is less than 1.5dB, and the antenna peak gain is 10.6dBi.","PeriodicalId":198124,"journal":{"name":"2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134290782","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 : 2018-08-01DOI: 10.1109/APCAP.2018.8538211
Ming-Gong Lee, Kun-Ming Yu
A study by using Adaptable Ant Colony Optimization Algorithm (AACO) to solve the path arrangement problem has been given in [1]. This algorithm can determine the priority of visit for different attractions, by using travel time and the distance between two attractions to determine the optimal path arrangement for visitors. Though, the probability function seems to be determined by some exponential function with fixed powers $alpha$ and $beta$, this study tries to apply GA (Genetic algorithm) to find optimal $alpha$ and $beta$ in each determination of the probability, and we name the new algorithm as Improved Ant Colony Optimization Algorithm (IAACO). The numerical outputs of IAACO show that it outperforms AACO and ACO by the total number of desire values and solid points, that means the rendered spots are among the most wantto-visit places. The variation of the parameters $alpha$ and $beta$ also shows that some best probability functions can be rendered by IAACO compared to the AACO and ACO (the original Ant Colony Optimization Algorithm) with fixed parameters only. It shows when the number of attractions are many, the performance of IAACO shows better results. A selectable choice of places is possible and their rendered route is illustrated in Google Map for users’ reference.
{"title":"Dynamic Path Planning Based on an Improved Ant Colony Optimization with Genetic Algorithm","authors":"Ming-Gong Lee, Kun-Ming Yu","doi":"10.1109/APCAP.2018.8538211","DOIUrl":"https://doi.org/10.1109/APCAP.2018.8538211","url":null,"abstract":"A study by using Adaptable Ant Colony Optimization Algorithm (AACO) to solve the path arrangement problem has been given in [1]. This algorithm can determine the priority of visit for different attractions, by using travel time and the distance between two attractions to determine the optimal path arrangement for visitors. Though, the probability function seems to be determined by some exponential function with fixed powers $alpha$ and $beta$, this study tries to apply GA (Genetic algorithm) to find optimal $alpha$ and $beta$ in each determination of the probability, and we name the new algorithm as Improved Ant Colony Optimization Algorithm (IAACO). The numerical outputs of IAACO show that it outperforms AACO and ACO by the total number of desire values and solid points, that means the rendered spots are among the most wantto-visit places. The variation of the parameters $alpha$ and $beta$ also shows that some best probability functions can be rendered by IAACO compared to the AACO and ACO (the original Ant Colony Optimization Algorithm) with fixed parameters only. It shows when the number of attractions are many, the performance of IAACO shows better results. A selectable choice of places is possible and their rendered route is illustrated in Google Map for users’ reference.","PeriodicalId":198124,"journal":{"name":"2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131632826","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 : 2018-08-01DOI: 10.1109/APCAP.2018.8538131
Yaqing Yu, Wen Jiang, T. Hong, S. Gong
This paper presents a differential fed square openended waveguide (OEW) antenna based on stepped ridge transition for planar near-field (PNF) measurement application, covering 8 GHz to 12 GHz. By using a multi-stepped quad-ridged transition, the in-band reflection coefficient characteristic of the coaxial-waveguide can be optimized, and finally can be controlled below -22dB for both polarizations. At the same time, the differential feeding technology is adopted, which can suppress some high-order modes. The simulated results show that the proposed square OEW antenna possesses low reflection, high isolation, high polarization discrimination and stable radiation pattern characteristics in the working band. Therefore, it has great potential to be used as a probe antenna for PNF measurement systems.
{"title":"A differential fed open-ended waveguide antenna based on stepped ridge transition","authors":"Yaqing Yu, Wen Jiang, T. Hong, S. Gong","doi":"10.1109/APCAP.2018.8538131","DOIUrl":"https://doi.org/10.1109/APCAP.2018.8538131","url":null,"abstract":"This paper presents a differential fed square openended waveguide (OEW) antenna based on stepped ridge transition for planar near-field (PNF) measurement application, covering 8 GHz to 12 GHz. By using a multi-stepped quad-ridged transition, the in-band reflection coefficient characteristic of the coaxial-waveguide can be optimized, and finally can be controlled below -22dB for both polarizations. At the same time, the differential feeding technology is adopted, which can suppress some high-order modes. The simulated results show that the proposed square OEW antenna possesses low reflection, high isolation, high polarization discrimination and stable radiation pattern characteristics in the working band. Therefore, it has great potential to be used as a probe antenna for PNF measurement systems.","PeriodicalId":198124,"journal":{"name":"2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128826732","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 : 2018-08-01DOI: 10.1109/APCAP.2018.8537917
Mingkai Liu, D. Powell, Y. Zárate, I. Shadrivov, David A. Powell
Huygens’ metasurfaces allow almost arbitrary wave-front shaping. However, it remains highly nontrivial to achieve dynamic and arbitrary control of the amplitude and phase response. Here we show that in a system consisting of both electric and magnetic meta-atoms with independently controlled modulation, the incident wave can be efficiently converted to sidebands of new frequencies, whose scattering directionality, phase and conversion efficiency can be manipulated almost arbitrarily.
{"title":"Time-varying metasurfaces for arbitrary parametric wave control","authors":"Mingkai Liu, D. Powell, Y. Zárate, I. Shadrivov, David A. Powell","doi":"10.1109/APCAP.2018.8537917","DOIUrl":"https://doi.org/10.1109/APCAP.2018.8537917","url":null,"abstract":"Huygens’ metasurfaces allow almost arbitrary wave-front shaping. However, it remains highly nontrivial to achieve dynamic and arbitrary control of the amplitude and phase response. Here we show that in a system consisting of both electric and magnetic meta-atoms with independently controlled modulation, the incident wave can be efficiently converted to sidebands of new frequencies, whose scattering directionality, phase and conversion efficiency can be manipulated almost arbitrarily.","PeriodicalId":198124,"journal":{"name":"2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114570576","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 : 2018-08-01DOI: 10.1109/APCAP.2018.8538193
M. Tang, Xiaoming Chen, Yunlu Duan, Ting Shi, Mei Li, R. Ziolkowski
The designs of compact, low-profile, planar, flexible, directive, quasi-Yagi antennas are presented. By placing near-field resonant parasitic (NFRP) elements around the basic driven dipoles, these NFRP antennas achieve compactness, high efficiency and high directivity. The NFRP elements act either as director or reflector elements, empowering the antenna with desirable quasi-Yagi performance characteristics. These NFRP antennas are fabricated using thin substrates which can be bent without enduring any structure damage. The flexibility of these antennas is investigated under two bending conditions by mounting them on different radii cylinders. These antennas can be used in many advanced applications such as intelligent transportation system (ITS) and wearable devices.
{"title":"Designs of Compact, Flexible, Directive, Near-Field Resonant Parasitic (NFRP) Antennas","authors":"M. Tang, Xiaoming Chen, Yunlu Duan, Ting Shi, Mei Li, R. Ziolkowski","doi":"10.1109/APCAP.2018.8538193","DOIUrl":"https://doi.org/10.1109/APCAP.2018.8538193","url":null,"abstract":"The designs of compact, low-profile, planar, flexible, directive, quasi-Yagi antennas are presented. By placing near-field resonant parasitic (NFRP) elements around the basic driven dipoles, these NFRP antennas achieve compactness, high efficiency and high directivity. The NFRP elements act either as director or reflector elements, empowering the antenna with desirable quasi-Yagi performance characteristics. These NFRP antennas are fabricated using thin substrates which can be bent without enduring any structure damage. The flexibility of these antennas is investigated under two bending conditions by mounting them on different radii cylinders. These antennas can be used in many advanced applications such as intelligent transportation system (ITS) and wearable devices.","PeriodicalId":198124,"journal":{"name":"2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114800896","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 : 2018-08-01DOI: 10.1109/APCAP.2018.8538153
Xiaoyou Lin, Boon-Chong Seet, Frances Joseph
This paper analyzes the accuracy of characterized dielectric constant by existing two-microstrip-line (L-L) method and a recently proposed hybrid-microstrip-line (hybrid-ML) method at millimeter-wave frequency. The analysis is made on two types of dielectric materials: Rogers RT/d5880 standard high-frequency substrate and plain-woven polyester fabric substrate. The result shows that the hybrid-ML can achieve a good agreement between characterzed and vendor-specified values with less error as compared to the L-L method. Besides, due to the introduced error boxes, the hybrid-ML method also shows less variance in characterized values for both materials over the frequency of interest.
{"title":"Accuracy of Dielectric Material Characterization at Millimeter-wave","authors":"Xiaoyou Lin, Boon-Chong Seet, Frances Joseph","doi":"10.1109/APCAP.2018.8538153","DOIUrl":"https://doi.org/10.1109/APCAP.2018.8538153","url":null,"abstract":"This paper analyzes the accuracy of characterized dielectric constant by existing two-microstrip-line (L-L) method and a recently proposed hybrid-microstrip-line (hybrid-ML) method at millimeter-wave frequency. The analysis is made on two types of dielectric materials: Rogers RT/d5880 standard high-frequency substrate and plain-woven polyester fabric substrate. The result shows that the hybrid-ML can achieve a good agreement between characterzed and vendor-specified values with less error as compared to the L-L method. Besides, due to the introduced error boxes, the hybrid-ML method also shows less variance in characterized values for both materials over the frequency of interest.","PeriodicalId":198124,"journal":{"name":"2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114644840","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 : 2018-08-01DOI: 10.1109/APCAP.2018.8538025
Huiling Li, Bian Wu, Yutong Zhao, Liang Chen, Nan Wu
A flexible frequency selective surface (FSS) with high upper suppression is presented. The proposed FSS is composed of two flower-shaped metallic patterns on the top/bottom and a coupling aperture in the middle layer with petal-shaped slots. They are all etched on thin polyimide substrates and supported by flexible thin teflon substrates. The coupling aperture structure introduces two transmission zeros which greatly improve the frequency selectivity. The simulated results show that the flexible FSS performs at 17.2GHz with an insertion loss of 0.3dB and a 3-dB fractional bandwidth of 30.2%, ranging from 14.6GHz to 19.8GHz, which also exhibits incident-angle insensitive and polarization independent property.
{"title":"Design of Flexible Bandpass Frequency Selective Surface with High Out-of-band Suppresion","authors":"Huiling Li, Bian Wu, Yutong Zhao, Liang Chen, Nan Wu","doi":"10.1109/APCAP.2018.8538025","DOIUrl":"https://doi.org/10.1109/APCAP.2018.8538025","url":null,"abstract":"A flexible frequency selective surface (FSS) with high upper suppression is presented. The proposed FSS is composed of two flower-shaped metallic patterns on the top/bottom and a coupling aperture in the middle layer with petal-shaped slots. They are all etched on thin polyimide substrates and supported by flexible thin teflon substrates. The coupling aperture structure introduces two transmission zeros which greatly improve the frequency selectivity. The simulated results show that the flexible FSS performs at 17.2GHz with an insertion loss of 0.3dB and a 3-dB fractional bandwidth of 30.2%, ranging from 14.6GHz to 19.8GHz, which also exhibits incident-angle insensitive and polarization independent property.","PeriodicalId":198124,"journal":{"name":"2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116356078","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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