Pub Date : 2016-06-01DOI: 10.1109/APS.2016.7695881
C. Ponti, S. Ceccuzzi, G. Schettini, P. Baccarelli
High-gain antennas can be implemented applying an EBG structure as superstrate to planar low-gain radiators. A cavity is formed between the ground plane backing the primary source and the EBG superstrate, that is realized with a low-permittivity dielectric, in order to be fabricated with a 3D printer. Due to the finite size of the EBG layers, diffracted fields occur at the edges of the cavity. Furthermore, notwithstanding the considerable gain enhancement, most times side-lobe level is not optimized. EBG layouts with tapered periodicity are proposed to control the reflectivity of the EBG superstrates from the center of the structure towards the edges, in order to reduce diffraction effects and lower the side-lobe level.
{"title":"Tapered EBG superstrates for low-permittivity resonator antennas","authors":"C. Ponti, S. Ceccuzzi, G. Schettini, P. Baccarelli","doi":"10.1109/APS.2016.7695881","DOIUrl":"https://doi.org/10.1109/APS.2016.7695881","url":null,"abstract":"High-gain antennas can be implemented applying an EBG structure as superstrate to planar low-gain radiators. A cavity is formed between the ground plane backing the primary source and the EBG superstrate, that is realized with a low-permittivity dielectric, in order to be fabricated with a 3D printer. Due to the finite size of the EBG layers, diffracted fields occur at the edges of the cavity. Furthermore, notwithstanding the considerable gain enhancement, most times side-lobe level is not optimized. EBG layouts with tapered periodicity are proposed to control the reflectivity of the EBG superstrates from the center of the structure towards the edges, in order to reduce diffraction effects and lower the side-lobe level.","PeriodicalId":6496,"journal":{"name":"2016 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"223 1","pages":"345-346"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77432633","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 : 2016-06-01DOI: 10.1109/APS.2016.7695760
M. Ranjbar, A. Grbic
Wave matrices are an altenative network representation to conventional ABCD matrices for the analysis of cascaded electromagnetic structures. In this work, a review of these matrices and their relation to the other network representations is presented. Wave matrices are found for different interfaces and used to analyze and synthesize metasurfaces consisting of cascaded electric sheets.
{"title":"Analysis and synthesis of cascaded metasurfaces using wave matrices","authors":"M. Ranjbar, A. Grbic","doi":"10.1109/APS.2016.7695760","DOIUrl":"https://doi.org/10.1109/APS.2016.7695760","url":null,"abstract":"Wave matrices are an altenative network representation to conventional ABCD matrices for the analysis of cascaded electromagnetic structures. In this work, a review of these matrices and their relation to the other network representations is presented. Wave matrices are found for different interfaces and used to analyze and synthesize metasurfaces consisting of cascaded electric sheets.","PeriodicalId":6496,"journal":{"name":"2016 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"17 1","pages":"103-104"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77866563","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 : 2016-06-01DOI: 10.1109/APS.2016.7696070
Brian B. Tierney, A. Grbic
A compact, metamaterial-based antenna beam-former is presented. The design employs a new optimization technique that couples a custom finite-element method (FEM) electromagnetic solver to a constrained minimization algorithm. The optimization operates on a surrogate model of the beam-former composed of an inhomogeneous, anisotropic material. This technique is an alternative to transformation electromagnetics that offers improved flexibility and physical realizability. In particular, the technique offers device designs which transform stipulated input (incident) fields to prescribed output fields (with desired amplitude and phase distribution), while constraining the material parameters to realizable values.
{"title":"A compact, metamaterial beamformer designed through optimization","authors":"Brian B. Tierney, A. Grbic","doi":"10.1109/APS.2016.7696070","DOIUrl":"https://doi.org/10.1109/APS.2016.7696070","url":null,"abstract":"A compact, metamaterial-based antenna beam-former is presented. The design employs a new optimization technique that couples a custom finite-element method (FEM) electromagnetic solver to a constrained minimization algorithm. The optimization operates on a surrogate model of the beam-former composed of an inhomogeneous, anisotropic material. This technique is an alternative to transformation electromagnetics that offers improved flexibility and physical realizability. In particular, the technique offers device designs which transform stipulated input (incident) fields to prescribed output fields (with desired amplitude and phase distribution), while constraining the material parameters to realizable values.","PeriodicalId":6496,"journal":{"name":"2016 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"177 1","pages":"723-724"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79884635","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 : 2016-06-01DOI: 10.1109/APS.2016.7695930
V. Iyer, S. Kulkarni, H. Steyskal, S. Makarov
The embedded element pattern of an infinite array is one approach used to model finite size arrays greater than 10 × 10. For smaller array sizes however, using a single embedded element pattern may not suffice since the coupling results in large variations in the currents across elements. In this paper we try to determine if using all nine embedded element patterns of a 3 × 3 rectangular array to form the array radiation pattern compares favorably with the results from full-wave analysis with Antenna Toolbox. The results indicate that such an approximation is indeed valid.
{"title":"Using embedded element patterns for the analysis of small arrays","authors":"V. Iyer, S. Kulkarni, H. Steyskal, S. Makarov","doi":"10.1109/APS.2016.7695930","DOIUrl":"https://doi.org/10.1109/APS.2016.7695930","url":null,"abstract":"The embedded element pattern of an infinite array is one approach used to model finite size arrays greater than 10 × 10. For smaller array sizes however, using a single embedded element pattern may not suffice since the coupling results in large variations in the currents across elements. In this paper we try to determine if using all nine embedded element patterns of a 3 × 3 rectangular array to form the array radiation pattern compares favorably with the results from full-wave analysis with Antenna Toolbox. The results indicate that such an approximation is indeed valid.","PeriodicalId":6496,"journal":{"name":"2016 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"16 1","pages":"443-444"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80276109","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 : 2016-06-01DOI: 10.1109/APS.2016.7695920
Q. Dai, H. Gan, W. Chew, Chao‐Fu Wang
We perform characteristic mode analysis (CMA) for objects immersed in an arbitrarily inhomogeneous and anisotropic background. In addition to the free-space Green's function, our scheme leverages the background Green's function which consists of an extra scattering term to account for the scattering of the background inhomogeneity. The impedance operator of the object is constructed with the technique of numerical Green's function (NGF). With the proposed scheme, CMA is extended to more general applications, which offers better guidance in practical antenna engineering.
{"title":"Characteristic mode analysis using green's function of arbitrary background","authors":"Q. Dai, H. Gan, W. Chew, Chao‐Fu Wang","doi":"10.1109/APS.2016.7695920","DOIUrl":"https://doi.org/10.1109/APS.2016.7695920","url":null,"abstract":"We perform characteristic mode analysis (CMA) for objects immersed in an arbitrarily inhomogeneous and anisotropic background. In addition to the free-space Green's function, our scheme leverages the background Green's function which consists of an extra scattering term to account for the scattering of the background inhomogeneity. The impedance operator of the object is constructed with the technique of numerical Green's function (NGF). With the proposed scheme, CMA is extended to more general applications, which offers better guidance in practical antenna engineering.","PeriodicalId":6496,"journal":{"name":"2016 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"114 1","pages":"423-424"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80283942","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 : 2016-06-01DOI: 10.1109/APS.2016.7696598
Seth Mccormick, A. Zaghloul
UWB planar monopoles are excellent antennas for compact ultra-wide band applications. Because the antenna is purely linearly polarized, it may be possible to take advantage of the small cross polarization to make a dual polarized variant. This paper presents the baseline UWB monopole from which an early prototype dual-polarized variant is started. The concept of the prototype is presented.
{"title":"Dual linear polarized UWB planar monopole","authors":"Seth Mccormick, A. Zaghloul","doi":"10.1109/APS.2016.7696598","DOIUrl":"https://doi.org/10.1109/APS.2016.7696598","url":null,"abstract":"UWB planar monopoles are excellent antennas for compact ultra-wide band applications. Because the antenna is purely linearly polarized, it may be possible to take advantage of the small cross polarization to make a dual polarized variant. This paper presents the baseline UWB monopole from which an early prototype dual-polarized variant is started. The concept of the prototype is presented.","PeriodicalId":6496,"journal":{"name":"2016 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"184 1","pages":"1783-1784"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81585665","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 : 2016-06-01DOI: 10.1109/APS.2016.7695852
Yulong Xia, Liangmengcheng Zhu, Qi Zhu
A cylindrical conformai microstrip Yagi antenna working around 10 GHz with endfire radiation and vertical polarization is proposed. The presented Yagi antenna has advantages of low profile, small size and high endfire gain. Each element of the Yagi antenna is a microstrip antenna (MSA) with one edge shorted, which can be regarded as a half MSA (HMSA). Furthermore, a cylindrical conformal Yagi array consisted of 24 above Yagi antennas is presented to improve the endfire radiation performance. Simulated results show that an exactly endfire radiation with 21 dB gain can be provided. Besides, beaming scanning in the endfire direction with side lobe level (SLL) lower than -20 dB can also be realized by adjusting the amplitudes and phases of the antennas in the array.
{"title":"Cylindrical conformai microstrip Yagi array with endfire radiation and vertical polarization","authors":"Yulong Xia, Liangmengcheng Zhu, Qi Zhu","doi":"10.1109/APS.2016.7695852","DOIUrl":"https://doi.org/10.1109/APS.2016.7695852","url":null,"abstract":"A cylindrical conformai microstrip Yagi antenna working around 10 GHz with endfire radiation and vertical polarization is proposed. The presented Yagi antenna has advantages of low profile, small size and high endfire gain. Each element of the Yagi antenna is a microstrip antenna (MSA) with one edge shorted, which can be regarded as a half MSA (HMSA). Furthermore, a cylindrical conformal Yagi array consisted of 24 above Yagi antennas is presented to improve the endfire radiation performance. Simulated results show that an exactly endfire radiation with 21 dB gain can be provided. Besides, beaming scanning in the endfire direction with side lobe level (SLL) lower than -20 dB can also be realized by adjusting the amplitudes and phases of the antennas in the array.","PeriodicalId":6496,"journal":{"name":"2016 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"27 1","pages":"287-288"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81714604","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 : 2016-06-01DOI: 10.1109/APS.2016.7696089
C. Bencivenni, M. Ivashina, R. Maaskant
A design approach for large-scale sparse arrays based on Compressive Sensing has been recently introduced in the literature and extended to include complex EM effects and scan performance. However, that approach cannot directly control the number of excitation amplitudes. Here, we apply a two-step procedure that first synthesizes continuous rings with unconstrained amplitudes using an iterative ℓ1-norm minimization approach, and then replaces them with a circular isophoric ring array with a number of elements proportional to the original amplitude of each ring. The procedure is demonstrated for an isotropic array of a 10λ radius, for which a reference solution based on the analytical density-taper approach is available in the literature. Results show the capability of the proposed method to achieve a significant reduction of the array aperture (20%) with 25% less elements or 4dB lower peak side lobe level.
{"title":"Synthesis of circular isophoric sparse arrays by using compressive-sensing","authors":"C. Bencivenni, M. Ivashina, R. Maaskant","doi":"10.1109/APS.2016.7696089","DOIUrl":"https://doi.org/10.1109/APS.2016.7696089","url":null,"abstract":"A design approach for large-scale sparse arrays based on Compressive Sensing has been recently introduced in the literature and extended to include complex EM effects and scan performance. However, that approach cannot directly control the number of excitation amplitudes. Here, we apply a two-step procedure that first synthesizes continuous rings with unconstrained amplitudes using an iterative ℓ1-norm minimization approach, and then replaces them with a circular isophoric ring array with a number of elements proportional to the original amplitude of each ring. The procedure is demonstrated for an isotropic array of a 10λ radius, for which a reference solution based on the analytical density-taper approach is available in the literature. Results show the capability of the proposed method to achieve a significant reduction of the array aperture (20%) with 25% less elements or 4dB lower peak side lobe level.","PeriodicalId":6496,"journal":{"name":"2016 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"93 1","pages":"761-762"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84237710","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 : 2016-06-01DOI: 10.1109/APS.2016.7696261
Mingbo Yao, Qi Zhu
To broaden the beamwidth of microstrip antenna (MSA), a method of loading parasitic dipoles is proposed. Its equivalent analysis model has been proposed based on the cavity model. Numerical results reveal that the dipole can act as director or reflector according to its length and the distance between the patch and dipole. Then, the effect of parameters of a pair of parasitic dipoles on beamwidth is discussed. Finally, a circularly polarized antenna with broad beamwidth working at 8.7 GHz is designed as an example. The simulated results show that the 3dB beamwidth of the proposed antenna is 144° and good circularly polarized performance can be obtained.
{"title":"Broad beamwidth and circularly polarized microstrip antenna with parasitic dipoles","authors":"Mingbo Yao, Qi Zhu","doi":"10.1109/APS.2016.7696261","DOIUrl":"https://doi.org/10.1109/APS.2016.7696261","url":null,"abstract":"To broaden the beamwidth of microstrip antenna (MSA), a method of loading parasitic dipoles is proposed. Its equivalent analysis model has been proposed based on the cavity model. Numerical results reveal that the dipole can act as director or reflector according to its length and the distance between the patch and dipole. Then, the effect of parameters of a pair of parasitic dipoles on beamwidth is discussed. Finally, a circularly polarized antenna with broad beamwidth working at 8.7 GHz is designed as an example. The simulated results show that the 3dB beamwidth of the proposed antenna is 144° and good circularly polarized performance can be obtained.","PeriodicalId":6496,"journal":{"name":"2016 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"9 1","pages":"1107-1108"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84248829","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 : 2016-06-01DOI: 10.1109/APS.2016.7696509
Shu C. Chen, W. Chew
A generalized modal analysis with discrete exterior calculus for 2-D or 3-D electromagnetic system is presented. For an arbitrarily shaped inhomogeneous system, discrete exterior calculus provides a simple way to formulate the problem based on a triangular or tetrahedral discretization. In this paper, circumcenter dual is adopted to achieve diagonal discrete Hodge star operators. We also consider signed dual volumes for all dimensions to keep the correctness and accuracy of discrete Hodge star operators. Traveling modes of inhomogeneous waveguides and resonant cavity modes are numerically calculated to validate this method.
{"title":"Generalized modal analysis of waveguides and resonators with discrete exterior calculus","authors":"Shu C. Chen, W. Chew","doi":"10.1109/APS.2016.7696509","DOIUrl":"https://doi.org/10.1109/APS.2016.7696509","url":null,"abstract":"A generalized modal analysis with discrete exterior calculus for 2-D or 3-D electromagnetic system is presented. For an arbitrarily shaped inhomogeneous system, discrete exterior calculus provides a simple way to formulate the problem based on a triangular or tetrahedral discretization. In this paper, circumcenter dual is adopted to achieve diagonal discrete Hodge star operators. We also consider signed dual volumes for all dimensions to keep the correctness and accuracy of discrete Hodge star operators. Traveling modes of inhomogeneous waveguides and resonant cavity modes are numerically calculated to validate this method.","PeriodicalId":6496,"journal":{"name":"2016 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"27 1","pages":"1605-1606"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84416701","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：