Pub Date : 1900-01-01DOI: 10.1109/IWAT.2017.7915382
Antonios G. Pelekanidis, A. Lalas, N. Kantartzis, T. Tsiboukis
A systematic technique for the accurate implementation of electromagnetic resonance-based wireless power transfer (WPT) implementations by means of diverse metamaterials is presented in this paper. To this aim, two distinct resonating elements are selected, i.e. the edge-coupled split ring resonator (EC-SRR) and the E2 SRR. In particular, the macroscopic properties of these elements are precisely retrieved and the preceding SRRs are then incorporated in the featured WPT scheme. The performance of the system, including the magnetically resonant SRR, is proven to be very promising for distances within a few centimeters, as expected from the initial theoretical analysis, contrary to the case of the electrically resonant elements.
{"title":"Optimized wireless power transfer schemes with metamaterial-based resonators","authors":"Antonios G. Pelekanidis, A. Lalas, N. Kantartzis, T. Tsiboukis","doi":"10.1109/IWAT.2017.7915382","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915382","url":null,"abstract":"A systematic technique for the accurate implementation of electromagnetic resonance-based wireless power transfer (WPT) implementations by means of diverse metamaterials is presented in this paper. To this aim, two distinct resonating elements are selected, i.e. the edge-coupled split ring resonator (EC-SRR) and the E2 SRR. In particular, the macroscopic properties of these elements are precisely retrieved and the preceding SRRs are then incorporated in the featured WPT scheme. The performance of the system, including the magnetically resonant SRR, is proven to be very promising for distances within a few centimeters, as expected from the initial theoretical analysis, contrary to the case of the electrically resonant elements.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115058742","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 : 1900-01-01DOI: 10.1109/IWAT.2017.7915314
T. Kawano, H. Nakano
The radiation characteristics for a grid array antenna printed on a dielectric substrate (PGAA) excited in unbalanced mode (UnBal-PGAA) are analyzed using an integral equation with the method of moments (MoM). The UnBal-PGAA radiates a linearly polarized beam in the broadside direction. It is found that a difference in the excitation modes (balance and unbalance) does not affect remarkably the half-power beam-width and the frequency bandwidth of the gain.
{"title":"Numerical analysis of a grid array antenna printed on a dielectric substrate fed by a coaxial line","authors":"T. Kawano, H. Nakano","doi":"10.1109/IWAT.2017.7915314","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915314","url":null,"abstract":"The radiation characteristics for a grid array antenna printed on a dielectric substrate (PGAA) excited in unbalanced mode (UnBal-PGAA) are analyzed using an integral equation with the method of moments (MoM). The UnBal-PGAA radiates a linearly polarized beam in the broadside direction. It is found that a difference in the excitation modes (balance and unbalance) does not affect remarkably the half-power beam-width and the frequency bandwidth of the gain.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123582192","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 : 1900-01-01DOI: 10.1109/IWAT.2017.7915388
T. Guo, Qingfeng Zhang, A. Kandwal, Rui Wang, Yifan Chen
A new non-reciprocal antenna array has been proposed in this paper for operation in microwave frequencies. The antenna array has been configured using a gyrator with the antenna patch elements through a T-type structure. Implementation of gyrator in the structure, that provides a phase shift of 180 degrees, results in a same beam direction of the forward and backward signals in the proposed antenna array. This proposed novel structure provides high radiation efficiency with beam steering and reduced side lobe levels.
{"title":"Design of nonreciprocal antenna array","authors":"T. Guo, Qingfeng Zhang, A. Kandwal, Rui Wang, Yifan Chen","doi":"10.1109/IWAT.2017.7915388","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915388","url":null,"abstract":"A new non-reciprocal antenna array has been proposed in this paper for operation in microwave frequencies. The antenna array has been configured using a gyrator with the antenna patch elements through a T-type structure. Implementation of gyrator in the structure, that provides a phase shift of 180 degrees, results in a same beam direction of the forward and backward signals in the proposed antenna array. This proposed novel structure provides high radiation efficiency with beam steering and reduced side lobe levels.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130202659","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 : 1900-01-01DOI: 10.1109/IWAT.2017.7915367
Nuzhat Yamin, Venkatesh Avula, A. Zadehgol
In this paper, we develop a novel technique for computing the complex-conjugate zeros of rational transfer functions in partial fraction form, by searching the complex Laplace s-plane for the local minima of the determinant of a block matrix derived from the state-space equations. A higher resolution scan, in the vicinity of each local minima, may be used to increase precision of the zeros. This method can be applied to antennas to extract the zeros from the antenna response. One numerical example and one practical coax patch antenna example have been used to illustrate the efficiency and effectiveness of the proposed method.
{"title":"A novel method for identifying complex zeros by searching the laplace-plane for local minima","authors":"Nuzhat Yamin, Venkatesh Avula, A. Zadehgol","doi":"10.1109/IWAT.2017.7915367","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915367","url":null,"abstract":"In this paper, we develop a novel technique for computing the complex-conjugate zeros of rational transfer functions in partial fraction form, by searching the complex Laplace s-plane for the local minima of the determinant of a block matrix derived from the state-space equations. A higher resolution scan, in the vicinity of each local minima, may be used to increase precision of the zeros. This method can be applied to antennas to extract the zeros from the antenna response. One numerical example and one practical coax patch antenna example have been used to illustrate the efficiency and effectiveness of the proposed method.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125642655","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 : 1900-01-01DOI: 10.1109/IWAT.2017.7915324
S. Bhardwaj, J. Volakis
T Traditional circularly polarized (CP) horn antennas use a septum (or a partition) based feed, which is difficult to fabricate beyond 60 GHz. As an alternative, here we propose hexagonal waveguide based CP antenna design that is fabrication friendly and low-cost. Design, fabrication and characterization is shown for an F-band prototype. The prototype exhibits 18 dBi mid-band gain with three dB axial-ratio (AR) bandwidth beyond thirty percent.
{"title":"Septum-less, hexagonal waveguide based circularly polarized horn antenna for mm-wave and terahertz band","authors":"S. Bhardwaj, J. Volakis","doi":"10.1109/IWAT.2017.7915324","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915324","url":null,"abstract":"T Traditional circularly polarized (CP) horn antennas use a septum (or a partition) based feed, which is difficult to fabricate beyond 60 GHz. As an alternative, here we propose hexagonal waveguide based CP antenna design that is fabrication friendly and low-cost. Design, fabrication and characterization is shown for an F-band prototype. The prototype exhibits 18 dBi mid-band gain with three dB axial-ratio (AR) bandwidth beyond thirty percent.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"143 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134517911","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 : 1900-01-01DOI: 10.1109/IWAT.2017.7915398
N. Nomura, N. Michishita, H. Morishita
For the disaster prevention, the person has to wear the helmet and use the transceiver by one hand operation. The helmet antenna has been required to achieve the hands-free operation. Since the operational band for disaster prevention is 150 MHz, which corresponds to wavelength of 2 meters, the required performances for the helmet antenna are not only the low-profile and small configuration but also the suppression of the radiation toward a human head. This paper presents the folded dipole antenna on the hemispherical PMC shell for the helmet antenna design. By applying the perfect magnetic conductor (PMC) boundary to the surface of the hemispherical shell, the suppression of radiation toward the human head and impedance matching can be achieved simultaneously.
{"title":"Folded dipole antenna on hemispherical PMC shell for helmet antenna design","authors":"N. Nomura, N. Michishita, H. Morishita","doi":"10.1109/IWAT.2017.7915398","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915398","url":null,"abstract":"For the disaster prevention, the person has to wear the helmet and use the transceiver by one hand operation. The helmet antenna has been required to achieve the hands-free operation. Since the operational band for disaster prevention is 150 MHz, which corresponds to wavelength of 2 meters, the required performances for the helmet antenna are not only the low-profile and small configuration but also the suppression of the radiation toward a human head. This paper presents the folded dipole antenna on the hemispherical PMC shell for the helmet antenna design. By applying the perfect magnetic conductor (PMC) boundary to the surface of the hemispherical shell, the suppression of radiation toward the human head and impedance matching can be achieved simultaneously.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114832485","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 : 1900-01-01DOI: 10.1109/IWAT.2017.7915401
H. Jaafar, S. Collardey, A. Sharaiha
Bandwidth and Efficiency enhancement by multiport loading of a double notched small antenna is presented in this paper. The technique used is based on the combination of the Network Characteristic Modes (NCM) with an optimization algorithm, in order to find the optimal load values at specified positions. The required loads are found to be simple capacitive loads.
{"title":"Bandwidth enhancement of a multiport double notched antenna using the Network Characteristic Modes","authors":"H. Jaafar, S. Collardey, A. Sharaiha","doi":"10.1109/IWAT.2017.7915401","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915401","url":null,"abstract":"Bandwidth and Efficiency enhancement by multiport loading of a double notched small antenna is presented in this paper. The technique used is based on the combination of the Network Characteristic Modes (NCM) with an optimization algorithm, in order to find the optimal load values at specified positions. The required loads are found to be simple capacitive loads.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125335741","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 : 1900-01-01DOI: 10.1109/IWAT.2017.7915333
Long Zhang, S. Gao, Q. Luo, Wenting Li
This paper presents a novel circularly polarized (CP) printed antenna with wide bandwidth and wide axial ratio (AR) beamwidth. The presented antenna is realized by bending a linearly polarized dipole into “S” shape with variable line width, which achieves circularly polarized radiation. Key parameters in designing such an “S” antenna are discussed and studied. It is found that this “S” antenna has some similar features to the linear polarized dipole, such as the feeding method, the radiation pattern in some main planes and nearly omnidirectional radiation in one main plane. To verify its performance, a ground plane backed inverted-S antenna is fabricated and characterized. Measured results confirm that the proposed antenna has good CP radiation, wide CP beamwidth from 4 to 6 GHz. The antenna is promising for applications in Global Navigation Satellite Systems (GNSS), and wideband wide-angle-scanning CP phased arrays.
{"title":"Wideband circularly polarized wide-beamwidth antenna using S-shaped dipole","authors":"Long Zhang, S. Gao, Q. Luo, Wenting Li","doi":"10.1109/IWAT.2017.7915333","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915333","url":null,"abstract":"This paper presents a novel circularly polarized (CP) printed antenna with wide bandwidth and wide axial ratio (AR) beamwidth. The presented antenna is realized by bending a linearly polarized dipole into “S” shape with variable line width, which achieves circularly polarized radiation. Key parameters in designing such an “S” antenna are discussed and studied. It is found that this “S” antenna has some similar features to the linear polarized dipole, such as the feeding method, the radiation pattern in some main planes and nearly omnidirectional radiation in one main plane. To verify its performance, a ground plane backed inverted-S antenna is fabricated and characterized. Measured results confirm that the proposed antenna has good CP radiation, wide CP beamwidth from 4 to 6 GHz. The antenna is promising for applications in Global Navigation Satellite Systems (GNSS), and wideband wide-angle-scanning CP phased arrays.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134641636","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 : 1900-01-01DOI: 10.1109/IWAT.2017.7915389
X. Y. Lei, Y. J. Cheng
The orbital angular momentum (OAM) beam can be used to significantly increase the communication capacity. In this paper, a reflectarray antenna is proposed and demonstrated for generating arbitrary OAM beams. A new dual-resonance dipole element is employed to implement the conversion between the incident spherical wave and the reflected OAM wave. Besides, this element can provide very good polarization separation and wide phase coverage. Thus, the OAM multiplexing can be achieved in a compact configuration by using independent feeders. As an example, four independent OAM modes, i.e., l=±1 and l=±2, are generated by a Ka-band reflectarray antenna.
{"title":"Orbital angular momentum reflectarray antenna with multiple modes","authors":"X. Y. Lei, Y. J. Cheng","doi":"10.1109/IWAT.2017.7915389","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915389","url":null,"abstract":"The orbital angular momentum (OAM) beam can be used to significantly increase the communication capacity. In this paper, a reflectarray antenna is proposed and demonstrated for generating arbitrary OAM beams. A new dual-resonance dipole element is employed to implement the conversion between the incident spherical wave and the reflected OAM wave. Besides, this element can provide very good polarization separation and wide phase coverage. Thus, the OAM multiplexing can be achieved in a compact configuration by using independent feeders. As an example, four independent OAM modes, i.e., l=±1 and l=±2, are generated by a Ka-band reflectarray antenna.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127458533","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 : 1900-01-01DOI: 10.1109/IWAT.2017.7915366
Mohamed El Badawe, O. Ramahi
Metamaterial particles are essentially electrically-small radiators with polarization dependency. Previous works on metamaterials were concerned primarily with using such particles to achieve homogeneous media that enabled unconventional propagation. The metamaterial radiators are inefficient if used in isolation, however, if used as an ensemble, they, collectively, radiate efficiently. This suggests their use as antennas. Because of their electrically-small size, metamaterial elements can be considered as Huygens radiators. With this perspective, a systematic procedure for designing directional and efficient antennas can be developed as we demonstrate here. Furthermore, the new perspective and technology can provide conformable antennas for non-planar platforms.
{"title":"Towards a methodology for conformable antenna design","authors":"Mohamed El Badawe, O. Ramahi","doi":"10.1109/IWAT.2017.7915366","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915366","url":null,"abstract":"Metamaterial particles are essentially electrically-small radiators with polarization dependency. Previous works on metamaterials were concerned primarily with using such particles to achieve homogeneous media that enabled unconventional propagation. The metamaterial radiators are inefficient if used in isolation, however, if used as an ensemble, they, collectively, radiate efficiently. This suggests their use as antennas. Because of their electrically-small size, metamaterial elements can be considered as Huygens radiators. With this perspective, a systematic procedure for designing directional and efficient antennas can be developed as we demonstrate here. Furthermore, the new perspective and technology can provide conformable antennas for non-planar platforms.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130769000","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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