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":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":"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/APCAP50217.2020.9245943
T. Ali, Xue Bai, Lei‐jun Xu
In this paper, a compact dual-band and CPW feeding antenna based on PVDF (polyvinylidene fluoride) piezoelectric film is proposed, which is suitable for 3G/4G/5G. The antenna is designed by a pair of fan-shaped CPW metal patches on PVDF film, the proposed antenna covers a bandwidth range of 1.9-2.8 GHz and 3.9-6 GHz. The gain is 2.05 dB at 2.4 GHz and 2.7 dB at 4.4 GHz. It has a compact size of 51 × 54 mm2 with the piezoelectric substrate thickness of 0.1 mm and dielectric constant of 9.5. The antenna shows good omnidirectional radiation characteristics in both lower and higher frequency bands. This piezoelectric antenna can be used for the RF and vibration hybrid energy harvesting system.
{"title":"Dual-band energy harvesting antenna based on PVDF piezoelectric material","authors":"T. Ali, Xue Bai, Lei‐jun Xu","doi":"10.1109/APCAP50217.2020.9245943","DOIUrl":"https://doi.org/10.1109/APCAP50217.2020.9245943","url":null,"abstract":"In this paper, a compact dual-band and CPW feeding antenna based on PVDF (polyvinylidene fluoride) piezoelectric film is proposed, which is suitable for 3G/4G/5G. The antenna is designed by a pair of fan-shaped CPW metal patches on PVDF film, the proposed antenna covers a bandwidth range of 1.9-2.8 GHz and 3.9-6 GHz. The gain is 2.05 dB at 2.4 GHz and 2.7 dB at 4.4 GHz. It has a compact size of 51 × 54 mm2 with the piezoelectric substrate thickness of 0.1 mm and dielectric constant of 9.5. The antenna shows good omnidirectional radiation characteristics in both lower and higher frequency bands. This piezoelectric antenna can be used for the RF and vibration hybrid energy harvesting system.","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":"123739942","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":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":"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/APCAP50217.2020.9246089
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":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":"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/APCAP50217.2020.9246144
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":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":"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/APCAP50217.2020.9245951
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":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":"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/APCAP50217.2020.9245946
Xiaofei Zhao, F. Xu
A novel metasurface antenna is proposed with capacitive loading and dual-layer metasurface array. The antenna consists of dual-layer array using different period and four strips are inserted into unit of the upper array. This structure increases surface capacitance, thus reduces operating frequency and make the antenna miniaturized. The proposed antenna with a low profile of 0.064λ0 and a metasurface size of 0.4λ0×0.4λ0 (λ0 is the center operating wavelength in free space) attains 26.2% simulated bandwidth (|S11| < -10dB) with 6.19-7dBi gain at 3.78-4.92GHz. Compared to the traditional metasurface antenna, the antenna size reduced to 30%.
{"title":"Miniaturized Wideband Low-Profile Antenna Based on Capacitive loading Metasurface","authors":"Xiaofei Zhao, F. Xu","doi":"10.1109/APCAP50217.2020.9245946","DOIUrl":"https://doi.org/10.1109/APCAP50217.2020.9245946","url":null,"abstract":"A novel metasurface antenna is proposed with capacitive loading and dual-layer metasurface array. The antenna consists of dual-layer array using different period and four strips are inserted into unit of the upper array. This structure increases surface capacitance, thus reduces operating frequency and make the antenna miniaturized. The proposed antenna with a low profile of 0.064λ0 and a metasurface size of 0.4λ0×0.4λ0 (λ0 is the center operating wavelength in free space) attains 26.2% simulated bandwidth (|S11| < -10dB) with 6.19-7dBi gain at 3.78-4.92GHz. Compared to the traditional metasurface antenna, the antenna size reduced to 30%.","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":"124518651","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/APCAP50217.2020.9246057
Xiaofei Xu, Xiao Deng, Yefang Wang
A stacked patch antenna is proposed which is loaded with mushroom metamaterials. The metamaterials enable the antenna to resonate at a very low frequency while the stacked patches broaden the impedance bandwidth. A particular metamaterial antenna is demonstrated in full wave calculations. A broad bandwidth of 24.6% is achieved for such a compact antenna, of which the driven and parasitic patch lengths are kept very small at the order of 0.21λ and 0.25λ respectively (λ is the wavelength of center frequency in the working bandwidth). The antenna gain is observed to be 7.26dBi while the peak efficiency is over 96% in the numerical example. The proposed antenna is suitable to be used in the portable wideband communications.
{"title":"Compact and Broadband Stacked Patch Antenna Loaded with Mushroom Metamaterials","authors":"Xiaofei Xu, Xiao Deng, Yefang Wang","doi":"10.1109/APCAP50217.2020.9246057","DOIUrl":"https://doi.org/10.1109/APCAP50217.2020.9246057","url":null,"abstract":"A stacked patch antenna is proposed which is loaded with mushroom metamaterials. The metamaterials enable the antenna to resonate at a very low frequency while the stacked patches broaden the impedance bandwidth. A particular metamaterial antenna is demonstrated in full wave calculations. A broad bandwidth of 24.6% is achieved for such a compact antenna, of which the driven and parasitic patch lengths are kept very small at the order of 0.21λ and 0.25λ respectively (λ is the wavelength of center frequency in the working bandwidth). The antenna gain is observed to be 7.26dBi while the peak efficiency is over 96% in the numerical example. The proposed antenna is suitable to be used in the portable wideband communications.","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":"128859264","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 novel low-profile miniaturized dipole antenna with omnidirectional radiation. The structure (60mm × 60mm × 4mm) is made up of a dipole antenna with branches attached. For the geometry of the antenna, it looks like a flywheel which is constructed by using four branches conflguration on metallic ground. In this work, this proposed antenna can be divided into four parts: 1) a metallic patch printed on the top of the FR4 substrate with εr = 4.4 and the thickness of 1.0 mm; 2) a dual-substrate connected by four copper branches; 3) a coax feed connected to the center of bottom substrate, and 4) a radome located above the antenna. The simulation results show that the bandwidth is 2.33 ~2.38 GHz and the resonance frequency is 2.35 GHz. Moreover, the radiation characteristic of the designing antenna shows a good omnidirectional performance.
{"title":"A Low-Profile Miniaturized Antenna with Omnidirectional Radiation Pattern","authors":"Tang Chen, Qiangming Cai, Li Gu, Xin Cao, Yuyu Zhu, Yanwen Zhao","doi":"10.1109/APCAP50217.2020.9246010","DOIUrl":"https://doi.org/10.1109/APCAP50217.2020.9246010","url":null,"abstract":"This paper presents a novel low-profile miniaturized dipole antenna with omnidirectional radiation. The structure (60mm × 60mm × 4mm) is made up of a dipole antenna with branches attached. For the geometry of the antenna, it looks like a flywheel which is constructed by using four branches conflguration on metallic ground. In this work, this proposed antenna can be divided into four parts: 1) a metallic patch printed on the top of the FR4 substrate with εr = 4.4 and the thickness of 1.0 mm; 2) a dual-substrate connected by four copper branches; 3) a coax feed connected to the center of bottom substrate, and 4) a radome located above the antenna. The simulation results show that the bandwidth is 2.33 ~2.38 GHz and the resonance frequency is 2.35 GHz. Moreover, the radiation characteristic of the designing antenna shows a good omnidirectional performance.","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":"122312180","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":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":"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}
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