Pub Date : 2015-10-26DOI: 10.1109/APS.2015.7305577
M. Laribi, M. Nedil, N. Kandil, A. Djaiz
In this paper, a grounded coplanar waveguide (GCPW) feed technique is proposed for gain control of a substrate integrated waveguide (SIW) horn antenna at 60 GHz. The controlling gain is obtained by using the NIP diodes (MA4FCP305). The return loss and antenna gain studies were performed using (HFSS) simulator. Simulated results showed an enhancement of the gain and bandwidth of the proposed antenna.
{"title":"SIW-horn antenna controllable gain enhacement","authors":"M. Laribi, M. Nedil, N. Kandil, A. Djaiz","doi":"10.1109/APS.2015.7305577","DOIUrl":"https://doi.org/10.1109/APS.2015.7305577","url":null,"abstract":"In this paper, a grounded coplanar waveguide (GCPW) feed technique is proposed for gain control of a substrate integrated waveguide (SIW) horn antenna at 60 GHz. The controlling gain is obtained by using the NIP diodes (MA4FCP305). The return loss and antenna gain studies were performed using (HFSS) simulator. Simulated results showed an enhancement of the gain and bandwidth of the proposed antenna.","PeriodicalId":242998,"journal":{"name":"2015 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123756140","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 : 2015-10-26DOI: 10.1109/APS.2015.7305290
A. Mohammad, Soo Yong Lim, Z. Yun, M. Iskander
Partially open drains make up a significant feature in many Asian cities. In this paper, a mock city is modeled to mimic a selected site from a real city in the town of Kajang in Malaysia, which contains partially open drain structures. The mock city model is first built without the existence of the partially open drain structures to model a flat ground surface, and next modified to have the partially open drain structures inserted to portray the real scenario. These models are fed into a 3D ray tracing software for running numerical simulations in several transmitter-receiver (tx-rx) trajectories. The powers obtained from the simulations are subsequently compared for several scenarios when the said structures are absent and present. Our findings suggest that in a city where partially open drains are present, varying degree of difference in path gain can be expected for certain predefined tx-rx trajectories.
{"title":"A ray tracing method for propagation prediction in a mock city with partially open drains","authors":"A. Mohammad, Soo Yong Lim, Z. Yun, M. Iskander","doi":"10.1109/APS.2015.7305290","DOIUrl":"https://doi.org/10.1109/APS.2015.7305290","url":null,"abstract":"Partially open drains make up a significant feature in many Asian cities. In this paper, a mock city is modeled to mimic a selected site from a real city in the town of Kajang in Malaysia, which contains partially open drain structures. The mock city model is first built without the existence of the partially open drain structures to model a flat ground surface, and next modified to have the partially open drain structures inserted to portray the real scenario. These models are fed into a 3D ray tracing software for running numerical simulations in several transmitter-receiver (tx-rx) trajectories. The powers obtained from the simulations are subsequently compared for several scenarios when the said structures are absent and present. Our findings suggest that in a city where partially open drains are present, varying degree of difference in path gain can be expected for certain predefined tx-rx trajectories.","PeriodicalId":242998,"journal":{"name":"2015 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123856113","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 : 2015-10-26DOI: 10.1109/APS.2015.7304892
M. Martínez-Inglés, D. Gaillot, J. Pascual-García, Jose-Maria Molina Garcia-Pardo, M. Liénard, J. Rodríguez, L. Juan-Llácer
In this work different clustering approaches are investigated in the millimeter-wave (mm-W) frequency band from measurements and simulations. Multipath Component (MPC) parameters have been extracted from both measurements and simulations using RiMAX. Following this step, several clustering techniques such as visual inspection, K-means, and multipath component distance (MCD) were implemented and analyzed. We have found that, at mm-W, the number of MPC within a cluster is very small.
{"title":"Impact of clustering at mmW band frequencies","authors":"M. Martínez-Inglés, D. Gaillot, J. Pascual-García, Jose-Maria Molina Garcia-Pardo, M. Liénard, J. Rodríguez, L. Juan-Llácer","doi":"10.1109/APS.2015.7304892","DOIUrl":"https://doi.org/10.1109/APS.2015.7304892","url":null,"abstract":"In this work different clustering approaches are investigated in the millimeter-wave (mm-W) frequency band from measurements and simulations. Multipath Component (MPC) parameters have been extracted from both measurements and simulations using RiMAX. Following this step, several clustering techniques such as visual inspection, K-means, and multipath component distance (MCD) were implemented and analyzed. We have found that, at mm-W, the number of MPC within a cluster is very small.","PeriodicalId":242998,"journal":{"name":"2015 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121176773","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 : 2015-10-26DOI: 10.1109/APS.2015.7305492
A. Pal, A. Mehta, Rob Lewis, N. Clow
A 2×2 phased array antenna consisting of pattern reconfigurable Square Loop Antennas (SLAs) is presented for high gain wide angle scanning. The single element SLA works in two modes. The first is the tilted beam mode in which it can generate four tilted beams in four quadrants and the second mode is the axial radiation mode. In this paper, it is demonstrated that by combing these two modes, a 2×2 array of SLA is capable of providing high-gain wide-angle beam scanning. It is expected that in comparison with the conventional 2×2 patch array antenna the SLA array can offer a 75% wider scanning angle with gain up to 6 dB higher in the off bore sight direction. This property could be of a huge significance for scanning the wide sky for airborne and marine applications.
{"title":"Reconfigurable phased array antenna enabling a high gain wide angle beam scanning","authors":"A. Pal, A. Mehta, Rob Lewis, N. Clow","doi":"10.1109/APS.2015.7305492","DOIUrl":"https://doi.org/10.1109/APS.2015.7305492","url":null,"abstract":"A 2×2 phased array antenna consisting of pattern reconfigurable Square Loop Antennas (SLAs) is presented for high gain wide angle scanning. The single element SLA works in two modes. The first is the tilted beam mode in which it can generate four tilted beams in four quadrants and the second mode is the axial radiation mode. In this paper, it is demonstrated that by combing these two modes, a 2×2 array of SLA is capable of providing high-gain wide-angle beam scanning. It is expected that in comparison with the conventional 2×2 patch array antenna the SLA array can offer a 75% wider scanning angle with gain up to 6 dB higher in the off bore sight direction. This property could be of a huge significance for scanning the wide sky for airborne and marine applications.","PeriodicalId":242998,"journal":{"name":"2015 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115817741","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 : 2015-10-26DOI: 10.1109/APS.2015.7304946
K. Sun, J. Lee, J. Graham
Solutions of a metallic rectangular waveguide filled with uniaxial medium are obtained with a new approach. The direction of the optic axis is tilted but lying in one of the sidewall planes of the waveguide. The formulation is based on decomposition into ordinary and extraordinary waves. The proposed method seeks wavenumbers of supported travelling modes, and is also able to calculate both cutoff frequencies and field magnitudes of every mode supported.
{"title":"Rectangular waveguide containing uniaxial medium with tilted optic axis in sidewall plane","authors":"K. Sun, J. Lee, J. Graham","doi":"10.1109/APS.2015.7304946","DOIUrl":"https://doi.org/10.1109/APS.2015.7304946","url":null,"abstract":"Solutions of a metallic rectangular waveguide filled with uniaxial medium are obtained with a new approach. The direction of the optic axis is tilted but lying in one of the sidewall planes of the waveguide. The formulation is based on decomposition into ordinary and extraordinary waves. The proposed method seeks wavenumbers of supported travelling modes, and is also able to calculate both cutoff frequencies and field magnitudes of every mode supported.","PeriodicalId":242998,"journal":{"name":"2015 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128568823","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 : 2015-10-26DOI: 10.1109/APS.2015.7305054
Bo Liu, S. Koziel
In the paper, antenna array optimization by means of an enhanced surrogate model-aware evolutionary search (SMAS) framework is presented. The enhancements aim at improving local optimization capabilities of SMAS. The local search engine, exploiting a surrogate assisted trust-region-based local search algorithm ORBIT is launched to fine-tune the solutions generated by SMAS to further decrease the optimization cost and maintain the global optimization ability of the algorithm. Two examples of linear array antenna problems verify the advantages of the method.
{"title":"Antenna array optimization using surrogate-model aware evolutionary algorithm with local search","authors":"Bo Liu, S. Koziel","doi":"10.1109/APS.2015.7305054","DOIUrl":"https://doi.org/10.1109/APS.2015.7305054","url":null,"abstract":"In the paper, antenna array optimization by means of an enhanced surrogate model-aware evolutionary search (SMAS) framework is presented. The enhancements aim at improving local optimization capabilities of SMAS. The local search engine, exploiting a surrogate assisted trust-region-based local search algorithm ORBIT is launched to fine-tune the solutions generated by SMAS to further decrease the optimization cost and maintain the global optimization ability of the algorithm. Two examples of linear array antenna problems verify the advantages of the method.","PeriodicalId":242998,"journal":{"name":"2015 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133881622","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 : 2015-10-26DOI: 10.1109/APS.2015.7305539
W. Cao, Beibei Li, L. Shafai, Si-min Li, Xi Gao, Xinhua Yu
A novel smart antenna based on metamaterial consisting of cut-wire metal rods which are formed a circle is presented. The antenna can operate in both directional and omnidirectional modes by choosing different the feed source automatically and adjusting the amplitude and phase of the feed source. The proposed designs can be used in high-speed communication networks.
{"title":"A smart antenna based on metamaterial","authors":"W. Cao, Beibei Li, L. Shafai, Si-min Li, Xi Gao, Xinhua Yu","doi":"10.1109/APS.2015.7305539","DOIUrl":"https://doi.org/10.1109/APS.2015.7305539","url":null,"abstract":"A novel smart antenna based on metamaterial consisting of cut-wire metal rods which are formed a circle is presented. The antenna can operate in both directional and omnidirectional modes by choosing different the feed source automatically and adjusting the amplitude and phase of the feed source. The proposed designs can be used in high-speed communication networks.","PeriodicalId":242998,"journal":{"name":"2015 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116793158","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 : 2015-10-26DOI: 10.1109/APS.2015.7305463
M. A. Moharram, A. Kishk
An investigation is performed to find the optimum radiation patterns for a reflectarray feed for maximum aperture efficiency. The radiation pattern is synthesized to uniformly illuminate a reflectarray aperture within a specified subtended angle through an inverse problem. Theoretical efficiency analysis for the proposed radiation pattern and its realizable approximation is invoked in comparison to conventional cosine tapered radiation patterns showing potential increase in aperture efficiency.
{"title":"Optimum reflectarray feed pattern synthesis","authors":"M. A. Moharram, A. Kishk","doi":"10.1109/APS.2015.7305463","DOIUrl":"https://doi.org/10.1109/APS.2015.7305463","url":null,"abstract":"An investigation is performed to find the optimum radiation patterns for a reflectarray feed for maximum aperture efficiency. The radiation pattern is synthesized to uniformly illuminate a reflectarray aperture within a specified subtended angle through an inverse problem. Theoretical efficiency analysis for the proposed radiation pattern and its realizable approximation is invoked in comparison to conventional cosine tapered radiation patterns showing potential increase in aperture efficiency.","PeriodicalId":242998,"journal":{"name":"2015 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116129009","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 : 2015-10-26DOI: 10.1109/APS.2015.7304871
D. M. Solís, M. Araújo, J. L. Rodríguez, F. Obelleiro, J. M. Taboada, L. Landesa
The full-wave simulation of metamaterials, presenting densely packed assemblies of subwavelength meta-atoms, poses a challenge for the computational electromagnetics community. Preserving the geometrical features of this kind of structures needs a highly discretized mesh, leading to problems that easily reach several tens of millions of unknowns if boundary element methods are used, despite the electric size being small. It is therefore evident that a means of compressing the resulting impedance matrix is paramount. In this regard, the spectral acceleration of the well-known fast multipole method (FMM) does not really exploit the rank-deficient method-of-moments matrix when applied to these scenarios, given its “low-frequency breakdown”. Although low-frequency versions of FMM have been proposed that try to circumvent this problem, we herein suggest to take advantage of the periodicity inherent to these nanostructures and directly compress the nearest couplings, for which standard FMM fails, through singular value decompositions (SVD) which are only performed a reduced number of times thanks to the repetition pattern.
{"title":"Boundary element method for the electromagnetic analysis of metamaterials","authors":"D. M. Solís, M. Araújo, J. L. Rodríguez, F. Obelleiro, J. M. Taboada, L. Landesa","doi":"10.1109/APS.2015.7304871","DOIUrl":"https://doi.org/10.1109/APS.2015.7304871","url":null,"abstract":"The full-wave simulation of metamaterials, presenting densely packed assemblies of subwavelength meta-atoms, poses a challenge for the computational electromagnetics community. Preserving the geometrical features of this kind of structures needs a highly discretized mesh, leading to problems that easily reach several tens of millions of unknowns if boundary element methods are used, despite the electric size being small. It is therefore evident that a means of compressing the resulting impedance matrix is paramount. In this regard, the spectral acceleration of the well-known fast multipole method (FMM) does not really exploit the rank-deficient method-of-moments matrix when applied to these scenarios, given its “low-frequency breakdown”. Although low-frequency versions of FMM have been proposed that try to circumvent this problem, we herein suggest to take advantage of the periodicity inherent to these nanostructures and directly compress the nearest couplings, for which standard FMM fails, through singular value decompositions (SVD) which are only performed a reduced number of times thanks to the repetition pattern.","PeriodicalId":242998,"journal":{"name":"2015 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129407553","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 : 2015-10-26DOI: 10.1109/APS.2015.7305329
Zhenchao Yang, K. Warnick
An equivalent circuit model is developed for intrinsically dual circularly polarized microstrip patch antennas. The circuit model can be tuned to represent a wide variety of antenna configurations and agrees well with full wave simulations of example antennas. Based on the model, we analyze cross polarization performance in terms of the Jones matrix and S-parameters and provide insight into the tradeoff between cross polarization performance and S-parameters.
{"title":"Jones matrix and S-parameter analysis using an equivalent circuit model for intrinsically dual circularly polarized microstrip antennas","authors":"Zhenchao Yang, K. Warnick","doi":"10.1109/APS.2015.7305329","DOIUrl":"https://doi.org/10.1109/APS.2015.7305329","url":null,"abstract":"An equivalent circuit model is developed for intrinsically dual circularly polarized microstrip patch antennas. The circuit model can be tuned to represent a wide variety of antenna configurations and agrees well with full wave simulations of example antennas. Based on the model, we analyze cross polarization performance in terms of the Jones matrix and S-parameters and provide insight into the tradeoff between cross polarization performance and S-parameters.","PeriodicalId":242998,"journal":{"name":"2015 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting","volume":"47 17","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113957806","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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