Pub Date : 2018-03-01DOI: 10.1109/IWAT.2018.8379140
Yang Chen, H. Meng, Yu Gan, W. Dou
A multi-beam reflector antenna at W band is designed. The antenna consists of a 6×6 horn array feed, a parabolic main reflector, and a hyperbolical sub-reflector. The 3dB beam width coverage is about 7.2°×7.2°. The gain at the center frequency is greater than 35.4dBi, and the gain difference between different beams is less than 2dB. The bandwidths of all the beams are larger than 2GHz at W band. The measured results agree well with the design.
{"title":"Millimeter wave multi-beam reflector antenna","authors":"Yang Chen, H. Meng, Yu Gan, W. Dou","doi":"10.1109/IWAT.2018.8379140","DOIUrl":"https://doi.org/10.1109/IWAT.2018.8379140","url":null,"abstract":"A multi-beam reflector antenna at W band is designed. The antenna consists of a 6×6 horn array feed, a parabolic main reflector, and a hyperbolical sub-reflector. The 3dB beam width coverage is about 7.2°×7.2°. The gain at the center frequency is greater than 35.4dBi, and the gain difference between different beams is less than 2dB. The bandwidths of all the beams are larger than 2GHz at W band. The measured results agree well with the design.","PeriodicalId":212550,"journal":{"name":"2018 International Workshop on Antenna Technology (iWAT)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132735393","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 : 2018-03-01DOI: 10.1109/IWAT.2018.8379138
Renzun Lian, Jin Pan, Xingyue Guo
A new kind of characteristic mode (CM) for PEC is constructed, and it can optimize radiated power. It is proved that all non-radiative CMs constitute the basis of the non-radiation space which is constituted by all non-radiative modes, and the non-radiation space is the same as the internal resonance space of closed PEC cavities, and then the eigen-mode theory for closed PEC cavities is classified into CM theory framework.
{"title":"New characteristic mode of perfect electric conductors for optimizing radiated power","authors":"Renzun Lian, Jin Pan, Xingyue Guo","doi":"10.1109/IWAT.2018.8379138","DOIUrl":"https://doi.org/10.1109/IWAT.2018.8379138","url":null,"abstract":"A new kind of characteristic mode (CM) for PEC is constructed, and it can optimize radiated power. It is proved that all non-radiative CMs constitute the basis of the non-radiation space which is constituted by all non-radiative modes, and the non-radiation space is the same as the internal resonance space of closed PEC cavities, and then the eigen-mode theory for closed PEC cavities is classified into CM theory framework.","PeriodicalId":212550,"journal":{"name":"2018 International Workshop on Antenna Technology (iWAT)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133531316","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 : 2018-03-01DOI: 10.1109/IWAT.2018.8379169
Weikang Chen, Z. Niu, Mengyuan Li, Qian Xu, Yuqing Xie
A dual-band monopole antenna fed with a coplanar waveguide (CPW) for wireless local area network (WLAN) communication in cabin is proposed in this paper. The antenna comprises an elliptical metallic patch as the monopole and a CPW as its feeding line. The simulated results demonstrate that the proposed antenna just covers the WLAN bands (2.4–2.485, 5.15–5.35 and 5.725–5.825 GHz) with good omnidirectional radiation patterns, which satisfy the requirements of WLAN applications. However, in multipath environment like the cabin of an airplane, the performance of the antenna will be influenced. Thus, a reverberation chamber (RC) is devoted to simulate the cabin environment because it can effectively form a uniform multipath propagation environment. In this work, the effects of the chamber on antenna radiation performance have been studied with scattering parameters (S-parameters). Furthermore, an alternative method is provided to investigate the environment of radiation posed by antennas for WLAN communication inside the chambers like the cabin of airplanes or trains.
{"title":"A dual-band CPW antenna designed for WLAN communication in cabin","authors":"Weikang Chen, Z. Niu, Mengyuan Li, Qian Xu, Yuqing Xie","doi":"10.1109/IWAT.2018.8379169","DOIUrl":"https://doi.org/10.1109/IWAT.2018.8379169","url":null,"abstract":"A dual-band monopole antenna fed with a coplanar waveguide (CPW) for wireless local area network (WLAN) communication in cabin is proposed in this paper. The antenna comprises an elliptical metallic patch as the monopole and a CPW as its feeding line. The simulated results demonstrate that the proposed antenna just covers the WLAN bands (2.4–2.485, 5.15–5.35 and 5.725–5.825 GHz) with good omnidirectional radiation patterns, which satisfy the requirements of WLAN applications. However, in multipath environment like the cabin of an airplane, the performance of the antenna will be influenced. Thus, a reverberation chamber (RC) is devoted to simulate the cabin environment because it can effectively form a uniform multipath propagation environment. In this work, the effects of the chamber on antenna radiation performance have been studied with scattering parameters (S-parameters). Furthermore, an alternative method is provided to investigate the environment of radiation posed by antennas for WLAN communication inside the chambers like the cabin of airplanes or trains.","PeriodicalId":212550,"journal":{"name":"2018 International Workshop on Antenna Technology (iWAT)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116045631","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 : 2018-03-01DOI: 10.1109/IWAT.2018.8379186
Yanfei Li, W. Hong, Mingde Li, Guizhen Lu
The analysis for the assembling of non-uniform, linear arrays based on Genetic Algorithm is presented. The GA optimization techniques generate the locations of the elements for reducing the side-lobe level. Results are presented for the placement of 20 elements under the design of a 15.5 λ. linear array. The scanning properties of the designed arrays are also investigated. According to the optimized results, patch antenna arrays are simulated by Ansys HFSS software to verify the optimization technique.
{"title":"Unequally spaced linear antenna arrays synthesis based on genetic algorithm","authors":"Yanfei Li, W. Hong, Mingde Li, Guizhen Lu","doi":"10.1109/IWAT.2018.8379186","DOIUrl":"https://doi.org/10.1109/IWAT.2018.8379186","url":null,"abstract":"The analysis for the assembling of non-uniform, linear arrays based on Genetic Algorithm is presented. The GA optimization techniques generate the locations of the elements for reducing the side-lobe level. Results are presented for the placement of 20 elements under the design of a 15.5 λ. linear array. The scanning properties of the designed arrays are also investigated. According to the optimized results, patch antenna arrays are simulated by Ansys HFSS software to verify the optimization technique.","PeriodicalId":212550,"journal":{"name":"2018 International Workshop on Antenna Technology (iWAT)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121721312","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 : 2018-03-01DOI: 10.1109/IWAT.2018.8379122
K. Nishimoto, Hidetoshi Makimura, T. Yanagi, Y. Nishioka, N. Yoneda, H. Miyashita
In this paper, we present narrowband/wideband decoupling networks for antenna arrays. The narrowband decoupling network is composed of only lumped elements, and the design equations that are valid for arbitrary two-element antenna arrays are derived. Moreover, we discuss the excitation distribution of the antenna elements when this network is applied. The wideband decoupling network consists of directional couplers, a transmission line, and a parallel resonant circuit. This network is effective for strongly frequency-dependent antenna coupling, and the design method is derived. We design two-element antenna arrays with the narrowband/wideband decoupling networks and confirm the validity of these networks.
{"title":"Narrowband/wideband decoupling networks for antenna arrays and excitation ditribution control","authors":"K. Nishimoto, Hidetoshi Makimura, T. Yanagi, Y. Nishioka, N. Yoneda, H. Miyashita","doi":"10.1109/IWAT.2018.8379122","DOIUrl":"https://doi.org/10.1109/IWAT.2018.8379122","url":null,"abstract":"In this paper, we present narrowband/wideband decoupling networks for antenna arrays. The narrowband decoupling network is composed of only lumped elements, and the design equations that are valid for arbitrary two-element antenna arrays are derived. Moreover, we discuss the excitation distribution of the antenna elements when this network is applied. The wideband decoupling network consists of directional couplers, a transmission line, and a parallel resonant circuit. This network is effective for strongly frequency-dependent antenna coupling, and the design method is derived. We design two-element antenna arrays with the narrowband/wideband decoupling networks and confirm the validity of these networks.","PeriodicalId":212550,"journal":{"name":"2018 International Workshop on Antenna Technology (iWAT)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127971050","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 : 2018-03-01DOI: 10.1109/IWAT.2018.8379185
Kun Wang, Fei Yang
A micro-lens antenna concept suitable for future tightly spaced terahertz heterodyne arrays has been proposed recently. The antenna consists of a waveguide feed which uses a leaky wave cavity to enhance the directivity and illuminate an extended hemispherical shallow lens efficiently. Two orthogonal double-slot apertures (irises) are designed to realize the dual-polarization operation. In this paper, we design and simulate the dual-polarized micro-lens antenna with an aperture diameter of 2.5mm and the maximum directivity of 21 dB at 300GHz.
{"title":"300GHz dual-polarized micro-lens antenna for terahertz integrated heterodyne arrays","authors":"Kun Wang, Fei Yang","doi":"10.1109/IWAT.2018.8379185","DOIUrl":"https://doi.org/10.1109/IWAT.2018.8379185","url":null,"abstract":"A micro-lens antenna concept suitable for future tightly spaced terahertz heterodyne arrays has been proposed recently. The antenna consists of a waveguide feed which uses a leaky wave cavity to enhance the directivity and illuminate an extended hemispherical shallow lens efficiently. Two orthogonal double-slot apertures (irises) are designed to realize the dual-polarization operation. In this paper, we design and simulate the dual-polarized micro-lens antenna with an aperture diameter of 2.5mm and the maximum directivity of 21 dB at 300GHz.","PeriodicalId":212550,"journal":{"name":"2018 International Workshop on Antenna Technology (iWAT)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125850261","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 : 2018-03-01DOI: 10.1109/IWAT.2018.8379209
Huan-Chu Huang
A simple, useful, and interesting rule named quasi-1/2 rule is presented to enable a quick estimation on the upper limit of the antenna efficiency. The studied upper limit of the antenna efficiency is based on assumptions that the antenna's power confinement in the near field and the related losses, such as the conductor losses and the substrate losses, can be ignored. In other words, all the received power by the antenna is radiated to the far field. The proposed quasi-1/2 rule is hence purely according to the VSWR (Voltage Standing Wave Ratio) values; therefore, it is an easy way to do a quick and helpful estimation and guidance without dimensions, structures, materials, etc., involved or known, which is especially beneficial to the antenna designers of cellular phones because of the complexity and uncertainty of the practical antenna environment in cellular phones. Moreover, the final result of the quasi-1/2 rule is just a single number, 1/2, which is very easy, simple, and straightforward to be memorized and applied.
{"title":"A Quasi-1/2 rule for quick estimation on the upper limit of the antenna efficiency","authors":"Huan-Chu Huang","doi":"10.1109/IWAT.2018.8379209","DOIUrl":"https://doi.org/10.1109/IWAT.2018.8379209","url":null,"abstract":"A simple, useful, and interesting rule named quasi-1/2 rule is presented to enable a quick estimation on the upper limit of the antenna efficiency. The studied upper limit of the antenna efficiency is based on assumptions that the antenna's power confinement in the near field and the related losses, such as the conductor losses and the substrate losses, can be ignored. In other words, all the received power by the antenna is radiated to the far field. The proposed quasi-1/2 rule is hence purely according to the VSWR (Voltage Standing Wave Ratio) values; therefore, it is an easy way to do a quick and helpful estimation and guidance without dimensions, structures, materials, etc., involved or known, which is especially beneficial to the antenna designers of cellular phones because of the complexity and uncertainty of the practical antenna environment in cellular phones. Moreover, the final result of the quasi-1/2 rule is just a single number, 1/2, which is very easy, simple, and straightforward to be memorized and applied.","PeriodicalId":212550,"journal":{"name":"2018 International Workshop on Antenna Technology (iWAT)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121909073","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 : 2018-03-01DOI: 10.1109/IWAT.2018.8379222
M. Sumi, J. Takada
The demand for Global Navigation Satellite Systems (GNSSs) has increased. Dual-frequency capability that includes the L1 band (1575.42 MHz) and the L2 band (1227.60 MHz) is needed to support recent high accuracy requirements. We propose a dual-band antenna configuration comprising two unsymmetrical rectangular loops that are fed in series for GNSS applications. The proposed antenna achieves operation in dual bands including the low (L2) and high (L1) bands. The antenna characteristics are investigated numerically and experimentally. The Voltage Standing Wave Ratio bandwidth (<2) including the low band is 20.9% and that (<2) including the high band is 33.6%. The Axial Ratio bandwidth (<3 dB) including the low band is 4.9% and that (<3 dB) including the high band is 4.7%. The measured and numerical results are in good agreement.
{"title":"Dual-band antenna configuration comprising two unsymmetrical rectangular loops fed in series for GNSS applications","authors":"M. Sumi, J. Takada","doi":"10.1109/IWAT.2018.8379222","DOIUrl":"https://doi.org/10.1109/IWAT.2018.8379222","url":null,"abstract":"The demand for Global Navigation Satellite Systems (GNSSs) has increased. Dual-frequency capability that includes the L1 band (1575.42 MHz) and the L2 band (1227.60 MHz) is needed to support recent high accuracy requirements. We propose a dual-band antenna configuration comprising two unsymmetrical rectangular loops that are fed in series for GNSS applications. The proposed antenna achieves operation in dual bands including the low (L2) and high (L1) bands. The antenna characteristics are investigated numerically and experimentally. The Voltage Standing Wave Ratio bandwidth (<2) including the low band is 20.9% and that (<2) including the high band is 33.6%. The Axial Ratio bandwidth (<3 dB) including the low band is 4.9% and that (<3 dB) including the high band is 4.7%. The measured and numerical results are in good agreement.","PeriodicalId":212550,"journal":{"name":"2018 International Workshop on Antenna Technology (iWAT)","volume":"33 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120977472","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 : 2018-03-01DOI: 10.1109/IWAT.2018.8379131
Zhouyun Chen, Xiwang Dai, G. Luo
This article describes a new H-slot coupled microstrip filter-antenna. In the antenna design, these microstrip lines are used to feed H-shaped coupling slots on the grounded metal plane. The H-shaped coupling slots feed top radiating patches, which can realize the radiation function of the antenna. The bilateral power divider is connected with the microstrip line, and realize the filtering function. The antenna has a bandwidth of 0.78 GHz from 3.02 to 3.8 GHz. In the frequency band of 3.4 to 3.6 GHz, the average gain in the direction perpendicular to the antenna plane has exceeded 11 dBi.
{"title":"A new H-slot coupled microstrip filter-antenna for modern wireless communication systems","authors":"Zhouyun Chen, Xiwang Dai, G. Luo","doi":"10.1109/IWAT.2018.8379131","DOIUrl":"https://doi.org/10.1109/IWAT.2018.8379131","url":null,"abstract":"This article describes a new H-slot coupled microstrip filter-antenna. In the antenna design, these microstrip lines are used to feed H-shaped coupling slots on the grounded metal plane. The H-shaped coupling slots feed top radiating patches, which can realize the radiation function of the antenna. The bilateral power divider is connected with the microstrip line, and realize the filtering function. The antenna has a bandwidth of 0.78 GHz from 3.02 to 3.8 GHz. In the frequency band of 3.4 to 3.6 GHz, the average gain in the direction perpendicular to the antenna plane has exceeded 11 dBi.","PeriodicalId":212550,"journal":{"name":"2018 International Workshop on Antenna Technology (iWAT)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123812068","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 : 2018-03-01DOI: 10.1109/IWAT.2018.8379215
Yuanhua Sun, Yihe Liu, Nianqing Tang, Dajun Xu, Y. Li, Yong-can Yu, Kai Zhang, Quandeng Gou, Z. Du
A gain enhancement wideband Quasi-Yagi elliptic dipole antenna is presented in this letter. The gain enhancement is achieved by loading with spliting-ring resonator (SRR) structures in the endfire direction while broad bandwidth is realized by using a microstrip-to-coplanar balun and elliptic dipole elements. The measurement results show the SRRs-loaded antenna presents around 5GHz-8GHz dB gain in the whole working band (5GHz-11GHz), which is around 2 dB more than the unloaded one. This antenna can be used in wireless communication systems for its advantages of broad bandwidth, endfire radiation and high gain.
{"title":"The design of wideband Quasi-Yagi elliptic dipole antenna with split-ring resonator (SRR) structures","authors":"Yuanhua Sun, Yihe Liu, Nianqing Tang, Dajun Xu, Y. Li, Yong-can Yu, Kai Zhang, Quandeng Gou, Z. Du","doi":"10.1109/IWAT.2018.8379215","DOIUrl":"https://doi.org/10.1109/IWAT.2018.8379215","url":null,"abstract":"A gain enhancement wideband Quasi-Yagi elliptic dipole antenna is presented in this letter. The gain enhancement is achieved by loading with spliting-ring resonator (SRR) structures in the endfire direction while broad bandwidth is realized by using a microstrip-to-coplanar balun and elliptic dipole elements. The measurement results show the SRRs-loaded antenna presents around 5GHz-8GHz dB gain in the whole working band (5GHz-11GHz), which is around 2 dB more than the unloaded one. This antenna can be used in wireless communication systems for its advantages of broad bandwidth, endfire radiation and high gain.","PeriodicalId":212550,"journal":{"name":"2018 International Workshop on Antenna Technology (iWAT)","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127324340","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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