Pub Date : 2020-08-04DOI: 10.1109/APCAP50217.2020.9245902
Dandan Yan, Lei Xing, Qian Xu, Lingqi Kong, X. Kong
In this paper, a salty water loaded transmission line attenuator is proposed. The attenuator consists of a metallic shielded stripline, salty water and a plastic container. By loading the salty water, the metallic shielded transmission has a -10 dB attenuation from 0.8 GHz to 3 GHz. This design takes full use of the water’s fluidity to circulate the water and dissipate the heat. Simulations are conducted to qualify and validate the attenuator performance. This design can be a promising candidate for high power applications.
{"title":"A Salty Water Wideband Liquid Attenuator","authors":"Dandan Yan, Lei Xing, Qian Xu, Lingqi Kong, X. Kong","doi":"10.1109/APCAP50217.2020.9245902","DOIUrl":"https://doi.org/10.1109/APCAP50217.2020.9245902","url":null,"abstract":"In this paper, a salty water loaded transmission line attenuator is proposed. The attenuator consists of a metallic shielded stripline, salty water and a plastic container. By loading the salty water, the metallic shielded transmission has a -10 dB attenuation from 0.8 GHz to 3 GHz. This design takes full use of the water’s fluidity to circulate the water and dissipate the heat. Simulations are conducted to qualify and validate the attenuator performance. This design can be a promising candidate for high power applications.","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":"124533503","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/APCAP50217.2020.9246099
Yu-wen Chai, Zehong Yan, Huanyu Song, Zhi-qiang Liu
In this paper, a four-port feed network for K and Ka dual frequency and dual circular polarization is proposed. The feed network consists of a low frequency 3dB bridge, a high frequency 3dB bridge and two diplexers. The return loss of diplexer in band is better than 30dB, and the isolation is better than 100dB, which directly improves the performance of the whole network. The standing wave (VSWR) of the final feed network reaches 1.2 and the isolation reaches 110dB.
{"title":"Design of Dual Band and Dual Circular Polarization Feed Network","authors":"Yu-wen Chai, Zehong Yan, Huanyu Song, Zhi-qiang Liu","doi":"10.1109/APCAP50217.2020.9246099","DOIUrl":"https://doi.org/10.1109/APCAP50217.2020.9246099","url":null,"abstract":"In this paper, a four-port feed network for K and Ka dual frequency and dual circular polarization is proposed. The feed network consists of a low frequency 3dB bridge, a high frequency 3dB bridge and two diplexers. The return loss of diplexer in band is better than 30dB, and the isolation is better than 100dB, which directly improves the performance of the whole network. The standing wave (VSWR) of the final feed network reaches 1.2 and the isolation reaches 110dB.","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":"121058986","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/APCAP50217.2020.9246126
Zicheng Zhou, Tian Keyan, Niu Yang
A frequency selective surface (FSS) integrated with a dual-band dual-reflection antenna is designed. The FSS, as the secondary reflection surface of the antenna, has good reflection characteristics for incident electromagnetic waves working at the Ka-band, and has good transmission characteristics for X-band and lower-frequency incident electromagnetic waves. The band-stop type FSS unit cell is selected according to the characteristics of the application, with metal ring two-dimensional periodic structure. The insertion loss of small incident angle waves in the X-band is less than 1dB, and the suppression of large-angle incident waves working at the Ka-band is higher than 10dB. The measured results show that the FSS achieves the expected performance and has wide engineering application value in the design of multi-band or broadband antennas.
{"title":"An FSS integrated with reflector antenna","authors":"Zicheng Zhou, Tian Keyan, Niu Yang","doi":"10.1109/APCAP50217.2020.9246126","DOIUrl":"https://doi.org/10.1109/APCAP50217.2020.9246126","url":null,"abstract":"A frequency selective surface (FSS) integrated with a dual-band dual-reflection antenna is designed. The FSS, as the secondary reflection surface of the antenna, has good reflection characteristics for incident electromagnetic waves working at the Ka-band, and has good transmission characteristics for X-band and lower-frequency incident electromagnetic waves. The band-stop type FSS unit cell is selected according to the characteristics of the application, with metal ring two-dimensional periodic structure. The insertion loss of small incident angle waves in the X-band is less than 1dB, and the suppression of large-angle incident waves working at the Ka-band is higher than 10dB. The measured results show that the FSS achieves the expected performance and has wide engineering application value in the design of multi-band or broadband antennas.","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":"122518714","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/APCAP50217.2020.9246116
Xiangxiang Li, Zhe Li, Cong Wan, Shiqiqan Song
This paper presents a 1-bit terahertz liquid crystal (LC) beam-steering antenna. It consists of a feed horn antenna and a flat rectangular transmitarray with 20×20 LC phase shifter unit cells. The unit cell could achieve phase difference within 180°±20° from 329 to 366.4GHz using double-layer of LC when the permittivity of the LC varies between 2.37 (state 0) and 3.29 (state 1). The full wave simulation results indicate that it can realize beam scanning over ±40° at 340GHz. The gain of the transmitarray is more than 21.4dBi.
{"title":"Design and Analysis of Terahertz Transmitarray Using 1-bit Liquid Crystal Phase Shifter","authors":"Xiangxiang Li, Zhe Li, Cong Wan, Shiqiqan Song","doi":"10.1109/APCAP50217.2020.9246116","DOIUrl":"https://doi.org/10.1109/APCAP50217.2020.9246116","url":null,"abstract":"This paper presents a 1-bit terahertz liquid crystal (LC) beam-steering antenna. It consists of a feed horn antenna and a flat rectangular transmitarray with 20×20 LC phase shifter unit cells. The unit cell could achieve phase difference within 180°±20° from 329 to 366.4GHz using double-layer of LC when the permittivity of the LC varies between 2.37 (state 0) and 3.29 (state 1). The full wave simulation results indicate that it can realize beam scanning over ±40° at 340GHz. The gain of the transmitarray is more than 21.4dBi.","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":"120903821","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/APCAP50217.2020.9245948
Kaicheng Cao, Yongqiang Cheng, Kang Liu, Jianqiu Wang, Hongqiang Wang
Microwave coincidence imaging (MCI) has great potential in super-resolution imaging realms, which has achieved a superior performance for sparse targets. However, its performance for complex target will degrade severely due to the weak sparsity. In this paper, the sparse representation method is applied to MCI and a reconstruction-based imaging method for complex target is proposed. Numerical experiments illustrate the validity of proposed method.
{"title":"A Microwave Coincidence Imaging Method for Complex Target Based on Sparse Representation","authors":"Kaicheng Cao, Yongqiang Cheng, Kang Liu, Jianqiu Wang, Hongqiang Wang","doi":"10.1109/APCAP50217.2020.9245948","DOIUrl":"https://doi.org/10.1109/APCAP50217.2020.9245948","url":null,"abstract":"Microwave coincidence imaging (MCI) has great potential in super-resolution imaging realms, which has achieved a superior performance for sparse targets. However, its performance for complex target will degrade severely due to the weak sparsity. In this paper, the sparse representation method is applied to MCI and a reconstruction-based imaging method for complex target is proposed. Numerical experiments illustrate the validity of proposed method.","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":"115473888","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/APCAP50217.2020.9246009
Yu-Dong Liang, Nengwu Liu, G. Fu, Lei Zhu
A low-profile wideband differential-fed dual- polarized microstrip patch antenna (MPA) based on three resonant modes is proposed. First, a differential feeding scheme is selected to suppress unnecessary modes and effectively reduce the cross-polarization level of the antenna. Next, a cross slot is etched out on the radiating patch and an array of shorting pins are loaded underneath the patch. Their main target is to resonate the antenna in two resonant modes. After that, an additional resonant mode is excited by using two pairs of L-shaped probes. With these arrangements, two resonant modes of the MPA and a resonant mode of the L-shaped probes are moved closely to each other, thus effectively extending its impedance bandwidth to about 22.6%. Meanwhile, it still keeps a low-profile property of about 0.029λ0 (λ0 is the free space wavelength). Additionally, the isolation between these differential-fed reaches to about 60 dB.
{"title":"A Low-Profile Wideband Dual-Polarized Microstrip Patch Antenna under Multi-Resonant Modes","authors":"Yu-Dong Liang, Nengwu Liu, G. Fu, Lei Zhu","doi":"10.1109/APCAP50217.2020.9246009","DOIUrl":"https://doi.org/10.1109/APCAP50217.2020.9246009","url":null,"abstract":"A low-profile wideband differential-fed dual- polarized microstrip patch antenna (MPA) based on three resonant modes is proposed. First, a differential feeding scheme is selected to suppress unnecessary modes and effectively reduce the cross-polarization level of the antenna. Next, a cross slot is etched out on the radiating patch and an array of shorting pins are loaded underneath the patch. Their main target is to resonate the antenna in two resonant modes. After that, an additional resonant mode is excited by using two pairs of L-shaped probes. With these arrangements, two resonant modes of the MPA and a resonant mode of the L-shaped probes are moved closely to each other, thus effectively extending its impedance bandwidth to about 22.6%. Meanwhile, it still keeps a low-profile property of about 0.029λ0 (λ0 is the free space wavelength). Additionally, the isolation between these differential-fed reaches to about 60 dB.","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":"115483157","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/APCAP50217.2020.9245903
Yuhua Zhao, I. Chen, C. Peng, Long Gao
A 10-port multi-system antenna operating in 5G NR (3300 MHz-3600 MHz, 4800 MHz-5000 MHz), 4G LTE (896 MHz-960 MHz, 1710 MHz-2170 MHz, 2500 MHz-2690 MHz), WiFi (2400 MHz-2500 MHz, 5150 MHz-5850 MHz) and Bluetooth (2400 MHz-2500 MHz), etc. bands for 5G smartphone application is proposed. All of the proposed antennas is composed of co-planar waveguide (CPW) feeding structure, multi-bended monopole trace and a printed ground-line which protrudes from ground-plane, to increase isolation and operating bandwidth. It is found that isolation of more than 15 dB can be achieved between each antenna. The human’s hand effect on impedance bandwidth and radiation characteristics of the proposed antenna is studied. Experimental results are shown to verify the validity of theoretical work.
{"title":"Ten-port Sub-6G antenna for 5G smartphone applications","authors":"Yuhua Zhao, I. Chen, C. Peng, Long Gao","doi":"10.1109/APCAP50217.2020.9245903","DOIUrl":"https://doi.org/10.1109/APCAP50217.2020.9245903","url":null,"abstract":"A 10-port multi-system antenna operating in 5G NR (3300 MHz-3600 MHz, 4800 MHz-5000 MHz), 4G LTE (896 MHz-960 MHz, 1710 MHz-2170 MHz, 2500 MHz-2690 MHz), WiFi (2400 MHz-2500 MHz, 5150 MHz-5850 MHz) and Bluetooth (2400 MHz-2500 MHz), etc. bands for 5G smartphone application is proposed. All of the proposed antennas is composed of co-planar waveguide (CPW) feeding structure, multi-bended monopole trace and a printed ground-line which protrudes from ground-plane, to increase isolation and operating bandwidth. It is found that isolation of more than 15 dB can be achieved between each antenna. The human’s hand effect on impedance bandwidth and radiation characteristics of the proposed antenna is studied. Experimental results are shown to verify the validity of theoretical work.","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":"130960402","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/APCAP50217.2020.9246091
A. Ghaffar, Xue Jun Li, Wahaj Abbas Awan, Niamat Hussain
This paper presents the design and realization of a compact dual-band flexible antenna. The antenna geometry consists of serpentine shaped to achieve a compact size antenna and defected ground structure (DGS) was used to improve matching for the lower resonance band. Furthermore, an additional capacitor is loaded in the DGS to achieve the higher resonance band. The antenna geometry consists of simple structure and shows a compact size of 78mm × 40mm × 0.254mm, which correspond to 0.22λ0 × 0.11λ0 × 0.0007λ0. To validate the design, an antenna prototype is fabricated, and a comparison of various performance parameters is presented in the manuscript.
{"title":"Capacitor Loaded Dual-band Flexible Antenna for ISM Band Applications","authors":"A. Ghaffar, Xue Jun Li, Wahaj Abbas Awan, Niamat Hussain","doi":"10.1109/APCAP50217.2020.9246091","DOIUrl":"https://doi.org/10.1109/APCAP50217.2020.9246091","url":null,"abstract":"This paper presents the design and realization of a compact dual-band flexible antenna. The antenna geometry consists of serpentine shaped to achieve a compact size antenna and defected ground structure (DGS) was used to improve matching for the lower resonance band. Furthermore, an additional capacitor is loaded in the DGS to achieve the higher resonance band. The antenna geometry consists of simple structure and shows a compact size of 78mm × 40mm × 0.254mm, which correspond to 0.22λ0 × 0.11λ0 × 0.0007λ0. To validate the design, an antenna prototype is fabricated, and a comparison of various performance parameters is presented in the manuscript.","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":"130874510","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/APCAP50217.2020.9246074
Ke-Xin Li, Yi-Wen Wu, Z. Hao
This paper investigates a left-hand circularly polarized (CP) magneto-electric (ME) dipole antenna array at millimeter-wave (mm-wave) 5G band. In the element, the circular polarization radiation is realized by connecting the inner corners of one pair of the ME dipoles and cutting the corners of the other pair of the ME dipoles. To verify the design, a 2 × 2 array antenna is designed, fabricated and measured. The measured fractional bandwidth (FBW) is 27.6% (25-33 GHz) for |S11| < -10 dB, and the 3-dB axial ratio (AR) bandwidth is 20.7% (26-32 GHz). In addition, the measured peak gain is 14.03 dBic at 29 GHz and the peak radiation efficiency is around 92.88%.
{"title":"A 5G Millimeter-Wave Circularly Polarized Planar Antenna Array","authors":"Ke-Xin Li, Yi-Wen Wu, Z. Hao","doi":"10.1109/APCAP50217.2020.9246074","DOIUrl":"https://doi.org/10.1109/APCAP50217.2020.9246074","url":null,"abstract":"This paper investigates a left-hand circularly polarized (CP) magneto-electric (ME) dipole antenna array at millimeter-wave (mm-wave) 5G band. In the element, the circular polarization radiation is realized by connecting the inner corners of one pair of the ME dipoles and cutting the corners of the other pair of the ME dipoles. To verify the design, a 2 × 2 array antenna is designed, fabricated and measured. The measured fractional bandwidth (FBW) is 27.6% (25-33 GHz) for |S11| < -10 dB, and the 3-dB axial ratio (AR) bandwidth is 20.7% (26-32 GHz). In addition, the measured peak gain is 14.03 dBic at 29 GHz and the peak radiation efficiency is around 92.88%.","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":"131628828","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/APCAP50217.2020.9245938
V. Popov, F. Boust, S. Burokur
Metasurfaces present high capabilities for wavefront tailoring. Classical metasurfaces composed of densely packed meta-atoms with local electromagnetic response show limitations in terms of efficiency. Here, we present and discuss the design of sparse metasurfaces composed of only few elements with strong electromagnetic non-locality. Sparse metasurfaces of arbitrary geometry are designed and validated at microwave frequencies for antenna applications.
{"title":"Sparse Metasurface: Design and Implementation","authors":"V. Popov, F. Boust, S. Burokur","doi":"10.1109/APCAP50217.2020.9245938","DOIUrl":"https://doi.org/10.1109/APCAP50217.2020.9245938","url":null,"abstract":"Metasurfaces present high capabilities for wavefront tailoring. Classical metasurfaces composed of densely packed meta-atoms with local electromagnetic response show limitations in terms of efficiency. Here, we present and discuss the design of sparse metasurfaces composed of only few elements with strong electromagnetic non-locality. Sparse metasurfaces of arbitrary geometry are designed and validated at microwave frequencies for antenna applications.","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":"131638256","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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