Pub Date : 2016-04-10DOI: 10.1109/EUCAP.2016.7481990
A. Narbudowicz, D. Heberling, M. Ammann
The paper proposes the use of a switchless reconfigurable antenna for a compact and low-cost directional modulation system. These systems are known to provide enhanced privacy of wireless systems, however the necessity for large antenna arrays prevents their implementation in small wireless sensors. The proposed work aims to bridge this application gap by demonstrating the use of a simple directional modulation scheme with a newly developed compact, switchless reconfigurable antenna.
{"title":"Low-cost directional modulation for small wireless sensor nodes","authors":"A. Narbudowicz, D. Heberling, M. Ammann","doi":"10.1109/EUCAP.2016.7481990","DOIUrl":"https://doi.org/10.1109/EUCAP.2016.7481990","url":null,"abstract":"The paper proposes the use of a switchless reconfigurable antenna for a compact and low-cost directional modulation system. These systems are known to provide enhanced privacy of wireless systems, however the necessity for large antenna arrays prevents their implementation in small wireless sensors. The proposed work aims to bridge this application gap by demonstrating the use of a simple directional modulation scheme with a newly developed compact, switchless reconfigurable antenna.","PeriodicalId":6509,"journal":{"name":"2016 10th European Conference on Antennas and Propagation (EuCAP)","volume":"10 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2016-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87646446","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 : 2016-04-10DOI: 10.1109/EUCAP.2016.7481515
D. Iero, L. Crocco, T. Isernia, E. Korkmaz
In this communication, two novel focusing methods are introduced and assessed in designing a pre-clinic applicator for hyperthermia treatment. The first method is an optimized version of the well known Time Reversal approach, which preserves the method's original simplicity and effectiveness. The second one pursues the focusing task in highly controlled way, by exploiting the convexity of the problem with respect to part of the unknowns (the array's excitations). In particular, it takes advantage of a constrained optimization framework, by imposing proper bounds on the power deposition in healthy tissues.
{"title":"Optimal focused electromagnetic hyperthermia treatment of breast cancer","authors":"D. Iero, L. Crocco, T. Isernia, E. Korkmaz","doi":"10.1109/EUCAP.2016.7481515","DOIUrl":"https://doi.org/10.1109/EUCAP.2016.7481515","url":null,"abstract":"In this communication, two novel focusing methods are introduced and assessed in designing a pre-clinic applicator for hyperthermia treatment. The first method is an optimized version of the well known Time Reversal approach, which preserves the method's original simplicity and effectiveness. The second one pursues the focusing task in highly controlled way, by exploiting the convexity of the problem with respect to part of the unknowns (the array's excitations). In particular, it takes advantage of a constrained optimization framework, by imposing proper bounds on the power deposition in healthy tissues.","PeriodicalId":6509,"journal":{"name":"2016 10th European Conference on Antennas and Propagation (EuCAP)","volume":"114 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2016-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87650629","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 : 2016-04-10DOI: 10.1109/EUCAP.2016.7481323
N. Ojaroudiparchin, M. Shen, G. Pedersen
An insensitive planar phased array antenna featuring high efficiency for 5G applications is introduced in this study. 64 compact slot-loop antenna elements have been used to form the planar array. The antenna is designed on a low cost FR4 substrate and has good performance in terms of gain and efficiency. This property has been achieved by applying a new type of slot-loop resonators in the design. The proposed antenna is designed to operate at 21-23.5 GHz and has consistent performance for different values of dielectric constants and loss tangents. It has high-gain, high-efficiency radiation beams at both sides of the substrate and could be used for mobile base stations (MBS). The proposed planar array could be integrated with the transceivers on the low-cost printed circuit boards (PCBs) to reduce the manufacturing cost.
{"title":"8×8 planar phased array antenna with high efficiency and insensitivity properties for 5G mobile base stations","authors":"N. Ojaroudiparchin, M. Shen, G. Pedersen","doi":"10.1109/EUCAP.2016.7481323","DOIUrl":"https://doi.org/10.1109/EUCAP.2016.7481323","url":null,"abstract":"An insensitive planar phased array antenna featuring high efficiency for 5G applications is introduced in this study. 64 compact slot-loop antenna elements have been used to form the planar array. The antenna is designed on a low cost FR4 substrate and has good performance in terms of gain and efficiency. This property has been achieved by applying a new type of slot-loop resonators in the design. The proposed antenna is designed to operate at 21-23.5 GHz and has consistent performance for different values of dielectric constants and loss tangents. It has high-gain, high-efficiency radiation beams at both sides of the substrate and could be used for mobile base stations (MBS). The proposed planar array could be integrated with the transceivers on the low-cost printed circuit boards (PCBs) to reduce the manufacturing cost.","PeriodicalId":6509,"journal":{"name":"2016 10th European Conference on Antennas and Propagation (EuCAP)","volume":"10 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2016-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88113899","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 : 2016-04-10DOI: 10.1109/EUCAP.2016.7481217
N. Chamanara, C. Caloz
Tunability of graphene is leveraged for the generation of a space-time modulated medium. Electromagnetic waves propagation in space-time modulated media produce interesting effects such as photonic interband and intraband transitions. We use dispersion engineering to efficiently control the transitions and transform the spectrum of the electromagnetic wave.
{"title":"Electromagnetic spectrum transformation in space-time modulated and dispersion engineered graphene surface plasmons","authors":"N. Chamanara, C. Caloz","doi":"10.1109/EUCAP.2016.7481217","DOIUrl":"https://doi.org/10.1109/EUCAP.2016.7481217","url":null,"abstract":"Tunability of graphene is leveraged for the generation of a space-time modulated medium. Electromagnetic waves propagation in space-time modulated media produce interesting effects such as photonic interband and intraband transitions. We use dispersion engineering to efficiently control the transitions and transform the spectrum of the electromagnetic wave.","PeriodicalId":6509,"journal":{"name":"2016 10th European Conference on Antennas and Propagation (EuCAP)","volume":"37 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2016-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88309326","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 : 2016-04-10DOI: 10.1109/EUCAP.2016.7481795
G. Labate, L. Matekovits, T. Isernia
An analytical approach for controlling the zeros of a scattering event (i.e., cloaking) is given, substituting the concept of positive-negative constitutive parameters with a positive-negative contrast formulation. Starting from the zero scattered field condition, a proper manipulation is performed and two different equations are derived: the Contrast-Field-Green Cloaking Equation (CFGCE) and the Contrast Cloaking Equation (CCE). In the present paper, the CCE is deeply analyzed and compared with the existing cloaking approaches in literature. It is shown how Transformation Optics and Scattering Cancellation methods corresponds to the Strong and Weak solutions of the CCE, respectively. This unique equation turns out to be independent from the involved physical events, if the main contrast parameter is properly chosen. Under its main assumptions, the CCE predicts a cloaking effect for arbitrary backgrounds, arbitrary shape objects and arbitrary physics of fields (e.g., magnetic, thermal, acoustic, etc.).
{"title":"A multiphysics theoretical approach for cloaking: Strong and weak solutions","authors":"G. Labate, L. Matekovits, T. Isernia","doi":"10.1109/EUCAP.2016.7481795","DOIUrl":"https://doi.org/10.1109/EUCAP.2016.7481795","url":null,"abstract":"An analytical approach for controlling the zeros of a scattering event (i.e., cloaking) is given, substituting the concept of positive-negative constitutive parameters with a positive-negative contrast formulation. Starting from the zero scattered field condition, a proper manipulation is performed and two different equations are derived: the Contrast-Field-Green Cloaking Equation (CFGCE) and the Contrast Cloaking Equation (CCE). In the present paper, the CCE is deeply analyzed and compared with the existing cloaking approaches in literature. It is shown how Transformation Optics and Scattering Cancellation methods corresponds to the Strong and Weak solutions of the CCE, respectively. This unique equation turns out to be independent from the involved physical events, if the main contrast parameter is properly chosen. Under its main assumptions, the CCE predicts a cloaking effect for arbitrary backgrounds, arbitrary shape objects and arbitrary physics of fields (e.g., magnetic, thermal, acoustic, etc.).","PeriodicalId":6509,"journal":{"name":"2016 10th European Conference on Antennas and Propagation (EuCAP)","volume":"28 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2016-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86385364","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 : 2016-04-10DOI: 10.1109/EUCAP.2016.7481684
M. Botha
In electromagnetic field modelling, the method of moments (MoM) is regularly used to solve surface currents. Recently, much progress has been made with numerical integration methods for the evaluation of the singular and near-singular surface integrals occurring in the MoM, especially in the context of using curved surface elements (curvilinear) with higher-order basis functions. The focus here is on the near-singular scalar Green's function kernel, when integrated over a triangle domain. This is a weak near-singularity. A first version of a new near-singularity cancellation quadrature rule is presented, which is constructed by applying a single near-singularity cancellation transformation to the whole domain, without splitting it into three sub-triangle domains as is typically done in other methods. The aim is to reduce the number of required quadrature points for a given accuracy. Promising preliminary results are shown, but there are various aspects that require further investigation and optimization.
{"title":"A single domain approach to weak near-singularity cancellation quadrature on triangle domains","authors":"M. Botha","doi":"10.1109/EUCAP.2016.7481684","DOIUrl":"https://doi.org/10.1109/EUCAP.2016.7481684","url":null,"abstract":"In electromagnetic field modelling, the method of moments (MoM) is regularly used to solve surface currents. Recently, much progress has been made with numerical integration methods for the evaluation of the singular and near-singular surface integrals occurring in the MoM, especially in the context of using curved surface elements (curvilinear) with higher-order basis functions. The focus here is on the near-singular scalar Green's function kernel, when integrated over a triangle domain. This is a weak near-singularity. A first version of a new near-singularity cancellation quadrature rule is presented, which is constructed by applying a single near-singularity cancellation transformation to the whole domain, without splitting it into three sub-triangle domains as is typically done in other methods. The aim is to reduce the number of required quadrature points for a given accuracy. Promising preliminary results are shown, but there are various aspects that require further investigation and optimization.","PeriodicalId":6509,"journal":{"name":"2016 10th European Conference on Antennas and Propagation (EuCAP)","volume":"142 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2016-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86528067","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 : 2016-04-10DOI: 10.1109/EUCAP.2016.7481188
N. M. Mohamed-Hicho, E. Antonino-Daviu, M. Cabedo-Fabrés, Juan Pablo Ciafardini, M. Ferrando-Bataller
Characteristic Mode (CM) analysis is carried out in order to understand the underlying physics of a popular slotted planar antenna, namely U-slot antenna, for achieving better performance. The Theory of Characteristic Modes (TCM) has been applied to get physical insight on the radiating behavior of the modes present on a U-slot etched on a finite metallic plate. Different types of U-slot planar structures are presented in order to demonstrate the effects produced by the inclusion of a U-slot in a broadband finite structure. The interaction between the corresponding U-slot modes and the metallic plate modes is fully discussed and justified for two specific cases. The information yielded by the modal analysis reveals the close influence of the plate size on the resonance frequency of the U-slot aperture. On the other hand, the length of the U-slot arms directly affects the resonance frequency of the modes associated to the metallic plate.
{"title":"On the interaction of Characteristic Modes in slot antennas etched on finite ground planes","authors":"N. M. Mohamed-Hicho, E. Antonino-Daviu, M. Cabedo-Fabrés, Juan Pablo Ciafardini, M. Ferrando-Bataller","doi":"10.1109/EUCAP.2016.7481188","DOIUrl":"https://doi.org/10.1109/EUCAP.2016.7481188","url":null,"abstract":"Characteristic Mode (CM) analysis is carried out in order to understand the underlying physics of a popular slotted planar antenna, namely U-slot antenna, for achieving better performance. The Theory of Characteristic Modes (TCM) has been applied to get physical insight on the radiating behavior of the modes present on a U-slot etched on a finite metallic plate. Different types of U-slot planar structures are presented in order to demonstrate the effects produced by the inclusion of a U-slot in a broadband finite structure. The interaction between the corresponding U-slot modes and the metallic plate modes is fully discussed and justified for two specific cases. The information yielded by the modal analysis reveals the close influence of the plate size on the resonance frequency of the U-slot aperture. On the other hand, the length of the U-slot arms directly affects the resonance frequency of the modes associated to the metallic plate.","PeriodicalId":6509,"journal":{"name":"2016 10th European Conference on Antennas and Propagation (EuCAP)","volume":"85 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2016-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83921596","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 : 2016-04-10DOI: 10.1109/EUCAP.2016.7481157
A. Farahbakhsh, D. Zarifi, A. Zaman, P. Kildal
This paper deals with the design of low loss wideband power dividers based on groove gap waveguide (GGW) technology. The advantages of GGW power dividers are low insertion loss, high power handling capacities, ease of fabrication and compatibility with integrated microwave networks. A 64-way power divider is designed and used as the feeding network of a 16×16-element slot antenna array at 60-GHz band. The results show that the gain and total radiation efficiency of the antenna are more than 32.5 dBi and 90% over the desired frequency range from 56 to 66.4 GHz.
{"title":"Corporate distribution networks for slot array antenna based on groove gap waveguide technology","authors":"A. Farahbakhsh, D. Zarifi, A. Zaman, P. Kildal","doi":"10.1109/EUCAP.2016.7481157","DOIUrl":"https://doi.org/10.1109/EUCAP.2016.7481157","url":null,"abstract":"This paper deals with the design of low loss wideband power dividers based on groove gap waveguide (GGW) technology. The advantages of GGW power dividers are low insertion loss, high power handling capacities, ease of fabrication and compatibility with integrated microwave networks. A 64-way power divider is designed and used as the feeding network of a 16×16-element slot antenna array at 60-GHz band. The results show that the gain and total radiation efficiency of the antenna are more than 32.5 dBi and 90% over the desired frequency range from 56 to 66.4 GHz.","PeriodicalId":6509,"journal":{"name":"2016 10th European Conference on Antennas and Propagation (EuCAP)","volume":"50 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2016-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82881438","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 : 2016-04-10DOI: 10.1109/EUCAP.2016.7481293
Tanja Pelzmann, T. Jost, M. Schwinzerl, F. Pérez-Fontán, M. Schonhuber, N. Floury
This paper reports the experimental design and implementation in a realistic environment of an airborne measurement set-up aiming at improving the quality and reliability of an aeronautical satellite transmission channel model in L-band. An improved satellite-to-aircraft channel model will allow more accurate predictions of the reception situation by considering all propagation related effects. This accuracy is important when developing and testing novel systems for critical safety-of-life application. The improvement of the channel model necessitates to assess, among other influences, the effects of the airborne platform on the electromagnetic pattern of the antennae for both fixed- and rotary-winged aircraft and the quantification of the ground-reflection characteristics in the frequency-band of interest. The herein presented activities are rounding out an extensive experimental campaign and build the continuation of the ground-based measurements outlined in a previous paper.
{"title":"Airborne measurements enhancing the satellite-to-aircraft channel model in L-band","authors":"Tanja Pelzmann, T. Jost, M. Schwinzerl, F. Pérez-Fontán, M. Schonhuber, N. Floury","doi":"10.1109/EUCAP.2016.7481293","DOIUrl":"https://doi.org/10.1109/EUCAP.2016.7481293","url":null,"abstract":"This paper reports the experimental design and implementation in a realistic environment of an airborne measurement set-up aiming at improving the quality and reliability of an aeronautical satellite transmission channel model in L-band. An improved satellite-to-aircraft channel model will allow more accurate predictions of the reception situation by considering all propagation related effects. This accuracy is important when developing and testing novel systems for critical safety-of-life application. The improvement of the channel model necessitates to assess, among other influences, the effects of the airborne platform on the electromagnetic pattern of the antennae for both fixed- and rotary-winged aircraft and the quantification of the ground-reflection characteristics in the frequency-band of interest. The herein presented activities are rounding out an extensive experimental campaign and build the continuation of the ground-based measurements outlined in a previous paper.","PeriodicalId":6509,"journal":{"name":"2016 10th European Conference on Antennas and Propagation (EuCAP)","volume":"14 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2016-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82921709","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 : 2016-04-10DOI: 10.1109/EUCAP.2016.7481661
A. Epstein, J. Wong, G. Eleftheriades
We propose a novel concept for highly-directive low-profile antennas, based on a single localized source embedded in a cavity, covered by an omega-type bianistoropic metasurface (BMS). We show that such metasurfaces, which include subwavelength particles with electric and magnetic polarizabilities, and magnetoelectric coupling, allow control of both the aperture field phase and the BMS reflection coefficient, without requiring active or lossy components. Subsequently, we use this degree of freedom to exclusively excite the highest-order fast lateral mode, guaranteeing optimal aperture illumination efficiency for arbitrarily-large apertures, without incurring edge-taper losses. We verify our semianalytical calculations with full-wave simulations, showing that the proposed antenna can outperform our previously-introduced cavity-excited Huygens' metasurface antenna, offering a simple and efficient design for compact high-gain antennas.
{"title":"Low-profile antennas with 100% aperture efficiency based on cavity-excited omega-type biansiotropic metasurfaces","authors":"A. Epstein, J. Wong, G. Eleftheriades","doi":"10.1109/EUCAP.2016.7481661","DOIUrl":"https://doi.org/10.1109/EUCAP.2016.7481661","url":null,"abstract":"We propose a novel concept for highly-directive low-profile antennas, based on a single localized source embedded in a cavity, covered by an omega-type bianistoropic metasurface (BMS). We show that such metasurfaces, which include subwavelength particles with electric and magnetic polarizabilities, and magnetoelectric coupling, allow control of both the aperture field phase and the BMS reflection coefficient, without requiring active or lossy components. Subsequently, we use this degree of freedom to exclusively excite the highest-order fast lateral mode, guaranteeing optimal aperture illumination efficiency for arbitrarily-large apertures, without incurring edge-taper losses. We verify our semianalytical calculations with full-wave simulations, showing that the proposed antenna can outperform our previously-introduced cavity-excited Huygens' metasurface antenna, offering a simple and efficient design for compact high-gain antennas.","PeriodicalId":6509,"journal":{"name":"2016 10th European Conference on Antennas and Propagation (EuCAP)","volume":"12 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2016-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88966596","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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