Pub Date : 2020-08-04DOI: 10.1109/APCAP50217.2020.9246089
Shunliu Jiang, X. Kong, Lingqi Kong, Qi Wang
In this paper, a metamaterial absorber with simultaneous high optical transparency and broadband microwave absorption is presented. By tailoring the reflection response of meta-atoms, 80% absorption performance from 6.8GHz to 18GHz is achieved. In the meantime, by employing transparent substrates, including indium tin oxide and anti-reflection glass, a maximum of 87% light transmittance is obtained. The absorptivity of the proposed metamaterial absorber is simulated and measured experimentally. Both results demonstrate highly consistence which verifies the reliability of our design for use in solar arrays.
{"title":"Transparent Low-scattering Metamaterial Absorber for Solar Arrays","authors":"Shunliu Jiang, X. Kong, Lingqi Kong, Qi Wang","doi":"10.1109/APCAP50217.2020.9246089","DOIUrl":"https://doi.org/10.1109/APCAP50217.2020.9246089","url":null,"abstract":"In this paper, a metamaterial absorber with simultaneous high optical transparency and broadband microwave absorption is presented. By tailoring the reflection response of meta-atoms, 80% absorption performance from 6.8GHz to 18GHz is achieved. In the meantime, by employing transparent substrates, including indium tin oxide and anti-reflection glass, a maximum of 87% light transmittance is obtained. The absorptivity of the proposed metamaterial absorber is simulated and measured experimentally. Both results demonstrate highly consistence which verifies the reliability of our design for use in solar arrays.","PeriodicalId":146561,"journal":{"name":"2020 9th Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126124670","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/APCAP50217.2020.9245951
V. Viikari, Jari-Matti Hannula, R. Kormilainen, Veli-Pekka Kutinlahti, A. Lehtovuori, R. Luomaniemi, T. Saarinen
All electrical properties of an antenna are determined by its current distribution. It is possible to numerically solve a current distribution producing optimal performance in some sense. However, this ideal current distribution is nearly impossible to realize in practice. We propose the discretized antenna concept, which makes it possible to realize nearly optimal current distributions in practice. The method does not necessitate manual error and trial type iteration and it can be solved with many design goals. In this paper, we describe the design steps.
{"title":"Discretized Antenna Concept","authors":"V. Viikari, Jari-Matti Hannula, R. Kormilainen, Veli-Pekka Kutinlahti, A. Lehtovuori, R. Luomaniemi, T. Saarinen","doi":"10.1109/APCAP50217.2020.9245951","DOIUrl":"https://doi.org/10.1109/APCAP50217.2020.9245951","url":null,"abstract":"All electrical properties of an antenna are determined by its current distribution. It is possible to numerically solve a current distribution producing optimal performance in some sense. However, this ideal current distribution is nearly impossible to realize in practice. We propose the discretized antenna concept, which makes it possible to realize nearly optimal current distributions in practice. The method does not necessitate manual error and trial type iteration and it can be solved with many design goals. In this paper, we describe the design steps.","PeriodicalId":146561,"journal":{"name":"2020 9th Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126391826","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/APCAP50217.2020.9246024
Jie Cao, Xiaofeng Chen, Tailei Wang, Rubing Han, Renrong Zhao, Yuanyun Liu
This paper describes a novel design of monopulse array antenna with open-end rectangular waveguide structures at K-band. The double short-circuit block structure of open-end waveguide is a miniaturized vertical structure which used as the radiator element, and overcomes the disadvantages of traditional waveguide slot antenna such as high machining precision requirement. In addition, the partition technology used to widen relative bandwidth (VSWR<2) to 4.7%, and the antenna adopts the Taylor synthesis algorithm to realize the low sidelobe character, the validity of the method is confirmed by calculation and computer simulation, the maximum gain is 27dBi and the side-lobe lever is less than -25.2dB, which can be very useful for radar application.
{"title":"Design of Monopulse Array Antenna With A New Open-End Waveguide Structure","authors":"Jie Cao, Xiaofeng Chen, Tailei Wang, Rubing Han, Renrong Zhao, Yuanyun Liu","doi":"10.1109/APCAP50217.2020.9246024","DOIUrl":"https://doi.org/10.1109/APCAP50217.2020.9246024","url":null,"abstract":"This paper describes a novel design of monopulse array antenna with open-end rectangular waveguide structures at K-band. The double short-circuit block structure of open-end waveguide is a miniaturized vertical structure which used as the radiator element, and overcomes the disadvantages of traditional waveguide slot antenna such as high machining precision requirement. In addition, the partition technology used to widen relative bandwidth (VSWR<2) to 4.7%, and the antenna adopts the Taylor synthesis algorithm to realize the low sidelobe character, the validity of the method is confirmed by calculation and computer simulation, the maximum gain is 27dBi and the side-lobe lever is less than -25.2dB, which can be very useful for radar application.","PeriodicalId":146561,"journal":{"name":"2020 9th Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125844952","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/APCAP50217.2020.9246027
Xinyun Song, Rui Zhao, Weiren Zhu
In this paper, an ultrathin tri-functional metasurface with PIN diodes and varactors incorporated is proposed. By varying the DC bias voltages, the proposed reconfigurable metasurface can achieve switchable functionalities of perfect reflection, transmission and absorption. The simulation results are presented and the performance of the metasurface is validated, which reveals that this metasurface may pave a new way for flexible manipulations of electromagnetic waves.
{"title":"Perfect Reflection/Transmission/Absorption in a Reconfigurable Metasurface","authors":"Xinyun Song, Rui Zhao, Weiren Zhu","doi":"10.1109/APCAP50217.2020.9246027","DOIUrl":"https://doi.org/10.1109/APCAP50217.2020.9246027","url":null,"abstract":"In this paper, an ultrathin tri-functional metasurface with PIN diodes and varactors incorporated is proposed. By varying the DC bias voltages, the proposed reconfigurable metasurface can achieve switchable functionalities of perfect reflection, transmission and absorption. The simulation results are presented and the performance of the metasurface is validated, which reveals that this metasurface may pave a new way for flexible manipulations of electromagnetic waves.","PeriodicalId":146561,"journal":{"name":"2020 9th Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122743498","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/APCAP50217.2020.9246144
Zhe Li, Xiangxiang Li, Cong Wan
This paper presents a Ka-band slant polarized circular waveguide phased array antenna. The radiator unit consists of a dielectric (εr=3.2) loaded circular waveguide, a PTFE cap and a stepped impedance transformer which connect the waveguide with a standard SMP connector. The simulation results show that the antenna array has the capability of beam scanning over ±45 ° within the working band from 32GHz to 40GHz.
{"title":"Design of a Ka-Band Slant Polarized Circular Waveguide Phased Array Antenna","authors":"Zhe Li, Xiangxiang Li, Cong Wan","doi":"10.1109/APCAP50217.2020.9246144","DOIUrl":"https://doi.org/10.1109/APCAP50217.2020.9246144","url":null,"abstract":"This paper presents a Ka-band slant polarized circular waveguide phased array antenna. The radiator unit consists of a dielectric (εr=3.2) loaded circular waveguide, a PTFE cap and a stepped impedance transformer which connect the waveguide with a standard SMP connector. The simulation results show that the antenna array has the capability of beam scanning over ±45 ° within the working band from 32GHz to 40GHz.","PeriodicalId":146561,"journal":{"name":"2020 9th Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126220952","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/APCAP50217.2020.9246085
Yifei Yan, Jue Wang, Hao Chen
Analysis on micro-doppler features using time-frequency analysis and super-resolution imaging has been a vital direction in radar target identification. However, because of heavy ground clutter, it’s difficult to use time-frequency analysis in SAR-GMTI[1], especially for low-velocity target. Besides, the traditional range model approximated by second-order polynomials is not suitable for micro-motion. For the above bottleneck, a regularity of interferometric phase of the micromotion target in multiple spatial channel in image domain is derived based on building the geometrical model in this paper. Besides, the correlation coefficient of the spatial steering vectors between each ghost point and clutter is introduced. The result of simulation also proves the founded principle has great improvement factor on detecting micro-motion targets in strong clutters.
{"title":"A Method for Improving SAR-GMTI Performance Based on Spatial Features of Micro Doppler","authors":"Yifei Yan, Jue Wang, Hao Chen","doi":"10.1109/APCAP50217.2020.9246085","DOIUrl":"https://doi.org/10.1109/APCAP50217.2020.9246085","url":null,"abstract":"Analysis on micro-doppler features using time-frequency analysis and super-resolution imaging has been a vital direction in radar target identification. However, because of heavy ground clutter, it’s difficult to use time-frequency analysis in SAR-GMTI[1], especially for low-velocity target. Besides, the traditional range model approximated by second-order polynomials is not suitable for micro-motion. For the above bottleneck, a regularity of interferometric phase of the micromotion target in multiple spatial channel in image domain is derived based on building the geometrical model in this paper. Besides, the correlation coefficient of the spatial steering vectors between each ghost point and clutter is introduced. The result of simulation also proves the founded principle has great improvement factor on detecting micro-motion targets in strong clutters.","PeriodicalId":146561,"journal":{"name":"2020 9th Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123086558","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/APCAP50217.2020.9245947
Huan-Chu Huang
This paper presents the retrospect and prospect on the trend of some representative mm-Wave antenna solutions, AiP, AiME, AiAiP, and AoD, to cellular phones. The main trigger factors for generation of these solutions are the constrains (e.g., the path losses and blockage) on the mm-Wave applications. Strategically, the underlying philosophy for the above solutions is the part integration; tactically, the underlying philosophy for design variants of the solutions is the capability expansion.
{"title":"Retrospect and Prospect on the Trend of mm-Wave Antenna Solutions to Cellular Phones","authors":"Huan-Chu Huang","doi":"10.1109/APCAP50217.2020.9245947","DOIUrl":"https://doi.org/10.1109/APCAP50217.2020.9245947","url":null,"abstract":"This paper presents the retrospect and prospect on the trend of some representative mm-Wave antenna solutions, AiP, AiME, AiAiP, and AoD, to cellular phones. The main trigger factors for generation of these solutions are the constrains (e.g., the path losses and blockage) on the mm-Wave applications. Strategically, the underlying philosophy for the above solutions is the part integration; tactically, the underlying philosophy for design variants of the solutions is the capability expansion.","PeriodicalId":146561,"journal":{"name":"2020 9th Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122460215","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 varactor-tunable bandpass frequency selective surface with wide tuning range is presented in this paper. The proposed Frequency Selective Surface (FSS) is composed of three stacked metallic layers. In the top and bottom layers, four varactors are loaded between the cross-shaped patch and the inductive wire grid of the FSS unit cell, respectively. The wire grid in each layer is connected by a via, which forms a bias network. The advantage of this network is that no additional DC bias network is needed, which can effectively reduce the frequency offset caused by DC bias. The passband can be tuned by changing the capacitance of varators loaded in the unit cell. Full-wave simulations show a 59% wide tuning range from 11.4 to 6.2GHz with an insertion loss between 0.3-2.3dB by changing the varator capacitance from 0.1 to 0.4pF.
{"title":"Varactor-tunable Bandpass Frequency Selective Surface with Wide Tuning Range","authors":"Renzhi Huang, Fushun Zhang, Yi‐Xuan Zhang, Chaozong Guo","doi":"10.1109/APCAP50217.2020.9246001","DOIUrl":"https://doi.org/10.1109/APCAP50217.2020.9246001","url":null,"abstract":"A varactor-tunable bandpass frequency selective surface with wide tuning range is presented in this paper. The proposed Frequency Selective Surface (FSS) is composed of three stacked metallic layers. In the top and bottom layers, four varactors are loaded between the cross-shaped patch and the inductive wire grid of the FSS unit cell, respectively. The wire grid in each layer is connected by a via, which forms a bias network. The advantage of this network is that no additional DC bias network is needed, which can effectively reduce the frequency offset caused by DC bias. The passband can be tuned by changing the capacitance of varators loaded in the unit cell. Full-wave simulations show a 59% wide tuning range from 11.4 to 6.2GHz with an insertion loss between 0.3-2.3dB by changing the varator capacitance from 0.1 to 0.4pF.","PeriodicalId":146561,"journal":{"name":"2020 9th Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121213536","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}
An active bandpass frequency selective surface (AFSS) is proposed in this paper based on the coupling principle, with good angularly and switching stabilities. Taking the wrench -shaped patch as the basic unit, AFSS tuning function is realized by changing the traditional structure and arrangement of wrench -shaped patch. Parameter analysis and equivalent circuit model are illustrated to explain the resonance behavior of the proposed AFSS. Numerical analysis software CST showed that by rotating the upper patch at 0°—120°, AFSS can be tuned in 6.36GHz -- 8.81GHz. It is demonstrated that the insertion loss can be reduced by changing the arm width of the unit, and the insertion loss can be kept within a certain range during tuning. According to the simulation and calculation, the FSS structure maintains good angularly stability within 0°—80° and has good switching stability during frequency band switching.
{"title":"Angularly and Switching—stable AFSS based on coupling principle","authors":"Chaorui Zhang, Shuaiheng Wang, Chenyue Xu, Xiaoyuan Zhang, Yingxue Shang","doi":"10.1109/APCAP50217.2020.9246050","DOIUrl":"https://doi.org/10.1109/APCAP50217.2020.9246050","url":null,"abstract":"An active bandpass frequency selective surface (AFSS) is proposed in this paper based on the coupling principle, with good angularly and switching stabilities. Taking the wrench -shaped patch as the basic unit, AFSS tuning function is realized by changing the traditional structure and arrangement of wrench -shaped patch. Parameter analysis and equivalent circuit model are illustrated to explain the resonance behavior of the proposed AFSS. Numerical analysis software CST showed that by rotating the upper patch at 0°—120°, AFSS can be tuned in 6.36GHz -- 8.81GHz. It is demonstrated that the insertion loss can be reduced by changing the arm width of the unit, and the insertion loss can be kept within a certain range during tuning. According to the simulation and calculation, the FSS structure maintains good angularly stability within 0°—80° and has good switching stability during frequency band switching.","PeriodicalId":146561,"journal":{"name":"2020 9th Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121316753","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/APCAP50217.2020.9246140
Zhe Zhang, K. An, Aixin Chen
A diplexing antenna with dual-band dual-sense circularly polarization is presented. The antenna is composed of two square patches with reverse truncated corners. High isolation and low frequency ratio of 1.09 are achieved by loading filtering structures on feeding networks. The stacked configuration is compacted and suitable for satellite communication systems.
{"title":"A Diplexing Antenna for Dual-band Dual-Sense Operation wih High Isolation","authors":"Zhe Zhang, K. An, Aixin Chen","doi":"10.1109/APCAP50217.2020.9246140","DOIUrl":"https://doi.org/10.1109/APCAP50217.2020.9246140","url":null,"abstract":"A diplexing antenna with dual-band dual-sense circularly polarization is presented. The antenna is composed of two square patches with reverse truncated corners. High isolation and low frequency ratio of 1.09 are achieved by loading filtering structures on feeding networks. The stacked configuration is compacted and suitable for satellite communication systems.","PeriodicalId":146561,"journal":{"name":"2020 9th Asia-Pacific Conference on Antennas and Propagation (APCAP)","volume":"294 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115929306","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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