Pub Date : 2022-07-06DOI: 10.1109/NEMO51452.2022.10038525
J. Portilla, J. Feuchtwanger, I. Arredondo, E. Asua, V. Etxebarria, N. Vallis, R. Enparantza, I. Ariz, I. Muñoz, U. Etxebeste, I. Hernández
The design and optimization of a Radio-Frequency Quadrupole (RFQ) for focusing, bunching and accelerating charged particles needs to simultaneously deal with electromagnetic, thermal and mechanical issues to achieve a fully operational structure. Four resonant cavities along the RFQ together with the ending cut backs have to provide a quadrupolar mode at the desired frequency and to produce a flat transversal electrical field amplitude across the overall length of the structure. The operation of an RFQ needs the injection of a very high RF signal power, so a high quality factor Q and appropriate handling of thermal losses is mandatory. A water-cooling circuit is commonly employed inserted in between the resonant lobes, close to the vane tips. On the other hand, RF and vacuum ports have to introduce minimal perturbations in the structure and, finally, a number of RF signal pick-ups and tuners are added to test and adjust the RFQ performance. The complexity of such structure together with the mechanical feasibility with required accuracy and tunability options is even more challenging when dealing with compact RFQ designs. The paper describes the EM and thermo-mechanical design and optimization of a compact RFQ intended for proton acceleration. The main aspects in this work are linked to the RFQ compactness and with the novel RF signal injection design.
{"title":"EM and Thermo-Mechanical Analysis and Design of a Compact-RFQ","authors":"J. Portilla, J. Feuchtwanger, I. Arredondo, E. Asua, V. Etxebarria, N. Vallis, R. Enparantza, I. Ariz, I. Muñoz, U. Etxebeste, I. Hernández","doi":"10.1109/NEMO51452.2022.10038525","DOIUrl":"https://doi.org/10.1109/NEMO51452.2022.10038525","url":null,"abstract":"The design and optimization of a Radio-Frequency Quadrupole (RFQ) for focusing, bunching and accelerating charged particles needs to simultaneously deal with electromagnetic, thermal and mechanical issues to achieve a fully operational structure. Four resonant cavities along the RFQ together with the ending cut backs have to provide a quadrupolar mode at the desired frequency and to produce a flat transversal electrical field amplitude across the overall length of the structure. The operation of an RFQ needs the injection of a very high RF signal power, so a high quality factor Q and appropriate handling of thermal losses is mandatory. A water-cooling circuit is commonly employed inserted in between the resonant lobes, close to the vane tips. On the other hand, RF and vacuum ports have to introduce minimal perturbations in the structure and, finally, a number of RF signal pick-ups and tuners are added to test and adjust the RFQ performance. The complexity of such structure together with the mechanical feasibility with required accuracy and tunability options is even more challenging when dealing with compact RFQ designs. The paper describes the EM and thermo-mechanical design and optimization of a compact RFQ intended for proton acceleration. The main aspects in this work are linked to the RFQ compactness and with the novel RF signal injection design.","PeriodicalId":102131,"journal":{"name":"2022 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114450539","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 : 2022-07-06DOI: 10.1109/NEMO51452.2022.10038951
D. R. Prado, J. A. López-Fernández, M. Arrebola
In this work, surrogate models based on support vector regression (SVR) of a multi-resonant unit cell with several degrees of freedom (DoF) per polarization are trained and used in a reflectarray antenna design and optimization. Since the unit cell has multiple sharp resonances when considering several DoF, the training process is carried out in a hyper-rectangle around a plane of stability. Results of SVR models with four geometrical DoF are shown to provide highly accurate results for the design and analysis of a very large contoured-beam reflectarray for space applications. The direct optimization layout with the surrogate models allows to improve the cross-polarization figures of merit several dB.
{"title":"Reflectarray Antenna Direct Optimization Using Surrogate Models with Several Geometrical Degrees of Freedom per Polarization","authors":"D. R. Prado, J. A. López-Fernández, M. Arrebola","doi":"10.1109/NEMO51452.2022.10038951","DOIUrl":"https://doi.org/10.1109/NEMO51452.2022.10038951","url":null,"abstract":"In this work, surrogate models based on support vector regression (SVR) of a multi-resonant unit cell with several degrees of freedom (DoF) per polarization are trained and used in a reflectarray antenna design and optimization. Since the unit cell has multiple sharp resonances when considering several DoF, the training process is carried out in a hyper-rectangle around a plane of stability. Results of SVR models with four geometrical DoF are shown to provide highly accurate results for the design and analysis of a very large contoured-beam reflectarray for space applications. The direct optimization layout with the surrogate models allows to improve the cross-polarization figures of merit several dB.","PeriodicalId":102131,"journal":{"name":"2022 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"33 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129706508","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 : 2022-07-06DOI: 10.1109/NEMO51452.2022.10038973
A. M. Valverde, Rui Miguel, A. Bretones, S. García
In this work, we intend to study stability of a FDTD subgridding method based on a 1:2 ratio transition and whose equations are directly obtained by using a main-dual grid formalism. We provide three different approaches in order to obtain a clear view of the stability: an heuristic study, an analytical scheme based on integration lines and surfaces and an spectral analysis. We show that all three methods provide similar results, obtaining that roughly a 65% time-step reduction is enough to achieve stability.
{"title":"An analysis of the stability of a general-purpose 3D subgridding method","authors":"A. M. Valverde, Rui Miguel, A. Bretones, S. García","doi":"10.1109/NEMO51452.2022.10038973","DOIUrl":"https://doi.org/10.1109/NEMO51452.2022.10038973","url":null,"abstract":"In this work, we intend to study stability of a FDTD subgridding method based on a 1:2 ratio transition and whose equations are directly obtained by using a main-dual grid formalism. We provide three different approaches in order to obtain a clear view of the stability: an heuristic study, an analytical scheme based on integration lines and surfaces and an spectral analysis. We show that all three methods provide similar results, obtaining that roughly a 65% time-step reduction is enough to achieve stability.","PeriodicalId":102131,"journal":{"name":"2022 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121161289","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 : 2022-07-06DOI: 10.1109/NEMO51452.2022.10038964
P. Raja, J. Nallatamby, M. Bouslama, J. Jacquet, R. Sommet, Christophe Chang, B. Lambert
This paper describes the high temperature reverse bias (HTRB) stress effects on 0.15 µm AlGaN/GaN high-electron mobility transistors (HEMTs) with Fe-doped buffer. The HEMTs were stressed to OFF-state bias ($V_{GS} = -7 mathrm{V}, V_{DS} = 25 mathrm{V}$) at 175°C for 1000 hours of duration. The subsequent degradation in the drain current is analyzed. The changes in $I_{G}-V_{G}$ at $V_{DS}= 0 mathrm{V}$ (emulating gate Schottky diode leakage) are investigated before and after the stress to inspect the Schottky gate interface quality. The gate leakage current evolutions are further examined with the $V_{G}$ and $V_{D}$ sweeps. After ageing test, the deviation in the emission rate of Fe-related trap at Ec - 0.5 eV (located in buffer) is quantified by means of low-frequency (LF) output-admittance ($Y_{22}$) and drain current transient (DCT) spectroscopy. Moreover, the drift in the output power ($P_{out}$) during first interim measurement of stressed HEMT is evaluated, with the supporting TCAD simulations. These preliminary HTRB test results are useful to understand the fundamental failure mechanisms of the HEMT due to the ageing in actual operating conditions.
{"title":"HTRB Stress Effects on 0.15 µm AlGaN/GaN HEMT Performance","authors":"P. Raja, J. Nallatamby, M. Bouslama, J. Jacquet, R. Sommet, Christophe Chang, B. Lambert","doi":"10.1109/NEMO51452.2022.10038964","DOIUrl":"https://doi.org/10.1109/NEMO51452.2022.10038964","url":null,"abstract":"This paper describes the high temperature reverse bias (HTRB) stress effects on 0.15 µm AlGaN/GaN high-electron mobility transistors (HEMTs) with Fe-doped buffer. The HEMTs were stressed to OFF-state bias ($V_{GS} = -7 mathrm{V}, V_{DS} = 25 mathrm{V}$) at 175°C for 1000 hours of duration. The subsequent degradation in the drain current is analyzed. The changes in $I_{G}-V_{G}$ at $V_{DS}= 0 mathrm{V}$ (emulating gate Schottky diode leakage) are investigated before and after the stress to inspect the Schottky gate interface quality. The gate leakage current evolutions are further examined with the $V_{G}$ and $V_{D}$ sweeps. After ageing test, the deviation in the emission rate of Fe-related trap at Ec - 0.5 eV (located in buffer) is quantified by means of low-frequency (LF) output-admittance ($Y_{22}$) and drain current transient (DCT) spectroscopy. Moreover, the drift in the output power ($P_{out}$) during first interim measurement of stressed HEMT is evaluated, with the supporting TCAD simulations. These preliminary HTRB test results are useful to understand the fundamental failure mechanisms of the HEMT due to the ageing in actual operating conditions.","PeriodicalId":102131,"journal":{"name":"2022 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125624750","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 : 2022-07-06DOI: 10.1109/NEMO51452.2022.10038953
Gian Marco Zampa, D. Mencarelli, L. Pierantoni
The present paper presents a physics-based finite element method (FEM) model for 2D-material FET simulations. Such model has been used to implement the coupled equations for charge transport and potential distribution, providing current density and charge distribution in the whole 3D geometry of the considered device. As a main result, we provide accurate description of the numerical strategies used to account for material non-idealities, such as those affecting the contact regions. The ability to account for the impact of defects and non-idealities on charge transport, in a full 3D geometry, makes the proposed method suitable for a rigorous description of realistic devices.
{"title":"A New Physics-Based FEM Model for 2D Material FET Design and Analysis Including the Effect of Defectivity","authors":"Gian Marco Zampa, D. Mencarelli, L. Pierantoni","doi":"10.1109/NEMO51452.2022.10038953","DOIUrl":"https://doi.org/10.1109/NEMO51452.2022.10038953","url":null,"abstract":"The present paper presents a physics-based finite element method (FEM) model for 2D-material FET simulations. Such model has been used to implement the coupled equations for charge transport and potential distribution, providing current density and charge distribution in the whole 3D geometry of the considered device. As a main result, we provide accurate description of the numerical strategies used to account for material non-idealities, such as those affecting the contact regions. The ability to account for the impact of defects and non-idealities on charge transport, in a full 3D geometry, makes the proposed method suitable for a rigorous description of realistic devices.","PeriodicalId":102131,"journal":{"name":"2022 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132370725","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 : 2022-07-06DOI: 10.1109/NEMO51452.2022.10038520
A. Ijjeh, M. Cueille, J. Dubard, M. Ney
This article revisits the ideal transformer model used at the interface between different sub-grids in non-structured TLM meshes. The derivation of the voltage-exchange equations between two subdomains with an arbitrary meshing ratio and connection topology is presented. The voltage-exchange process is then generalized as a scattering-matrix of an N-port network that processes all desired properties for a perfect interface. This S-matrix is derived directly for its properties and no concrete physical representation is required. Moreover, the necessary conditions that ensure stability of such connection will be presented in the final submission.
{"title":"Generalized TLM Block Meshing Scheme Based on N-port Network Representation","authors":"A. Ijjeh, M. Cueille, J. Dubard, M. Ney","doi":"10.1109/NEMO51452.2022.10038520","DOIUrl":"https://doi.org/10.1109/NEMO51452.2022.10038520","url":null,"abstract":"This article revisits the ideal transformer model used at the interface between different sub-grids in non-structured TLM meshes. The derivation of the voltage-exchange equations between two subdomains with an arbitrary meshing ratio and connection topology is presented. The voltage-exchange process is then generalized as a scattering-matrix of an N-port network that processes all desired properties for a perfect interface. This S-matrix is derived directly for its properties and no concrete physical representation is required. Moreover, the necessary conditions that ensure stability of such connection will be presented in the final submission.","PeriodicalId":102131,"journal":{"name":"2022 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127199795","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 : 2022-07-06DOI: 10.1109/NEMO51452.2022.10038967
C. Bilitos, X. Morvan, E. Martini, R. Sauleau, S. Maci, D. González-Ovejero
This papes describes the application of higher symmetries to enable broadband operation of Reflecting Luneburg lenses (RLL) at Ka-band. RLLs are a new type of beam-former, consisting of two vertically stacked parallel plate waveguides (PPWs) of circular shape, of which the bottom one is filled with a graded index (GRIN) medium with azimuthal symmetry. The rays launched by a source in the bottom PPW follow curvilinear paths such that they emerge collimated in the top PPW after encountering a reflecting boundary. Owing to the lens' symmetry, one can generate plane waves with arbitrary directions by simply changing the azimuthal position of the source in the bottom layer. In this paper, the GRIN medium is implemented by loading the bottom PPW with higher symmetric unit-cells consisting of metallic posts. This solution offers a double benefit: it allows one to synthesize the somehow high refractive indexes in the RLL profile and it also mitigates frequency dispersion, thus increasing the lens operational bandwidth. The proposed architecture constitutes a metal-only, low-profile beam-former that can provide full azimuthal scanning in the whole Ka-band.
{"title":"Broadband reflecting Luneburg lens beam-former at Ka-band","authors":"C. Bilitos, X. Morvan, E. Martini, R. Sauleau, S. Maci, D. González-Ovejero","doi":"10.1109/NEMO51452.2022.10038967","DOIUrl":"https://doi.org/10.1109/NEMO51452.2022.10038967","url":null,"abstract":"This papes describes the application of higher symmetries to enable broadband operation of Reflecting Luneburg lenses (RLL) at Ka-band. RLLs are a new type of beam-former, consisting of two vertically stacked parallel plate waveguides (PPWs) of circular shape, of which the bottom one is filled with a graded index (GRIN) medium with azimuthal symmetry. The rays launched by a source in the bottom PPW follow curvilinear paths such that they emerge collimated in the top PPW after encountering a reflecting boundary. Owing to the lens' symmetry, one can generate plane waves with arbitrary directions by simply changing the azimuthal position of the source in the bottom layer. In this paper, the GRIN medium is implemented by loading the bottom PPW with higher symmetric unit-cells consisting of metallic posts. This solution offers a double benefit: it allows one to synthesize the somehow high refractive indexes in the RLL profile and it also mitigates frequency dispersion, thus increasing the lens operational bandwidth. The proposed architecture constitutes a metal-only, low-profile beam-former that can provide full azimuthal scanning in the whole Ka-band.","PeriodicalId":102131,"journal":{"name":"2022 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"145 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128180255","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 : 2022-07-06DOI: 10.1109/NEMO51452.2022.10038963
N. Soleimani, R. Trinchero, F. Canavero
This paper presents a preliminary implementation of a general modeling framework for vector-valued functions based on a multi-output kernel Ridge regression (KRR). The proposed approach is based on a generalized definition of the reproducing kernel Hilbert space (RKHS) to the case of vector-valued functions, thus bridging the gap between multi-output Neural Network (NN) structures and standard scalar kernel-based approaches. The above concept is then used within the KRR to train a multi-output surrogate model able to predict the frequency responses of a high-speed link affected by four parameters with a large variability. The performance of the proposed approach, in terms of parametric and stochastic analysis, is compared with the one provided by two state-of-the-art techniques, such as the combination of the principal components analysis (PCA) and the least-squares support vector machine (LS-SVM) regression and a multi-output feed-forward NN structure.
{"title":"Vector-Valued Kernel Ridge Regression for the Modeling of High-Speed Links","authors":"N. Soleimani, R. Trinchero, F. Canavero","doi":"10.1109/NEMO51452.2022.10038963","DOIUrl":"https://doi.org/10.1109/NEMO51452.2022.10038963","url":null,"abstract":"This paper presents a preliminary implementation of a general modeling framework for vector-valued functions based on a multi-output kernel Ridge regression (KRR). The proposed approach is based on a generalized definition of the reproducing kernel Hilbert space (RKHS) to the case of vector-valued functions, thus bridging the gap between multi-output Neural Network (NN) structures and standard scalar kernel-based approaches. The above concept is then used within the KRR to train a multi-output surrogate model able to predict the frequency responses of a high-speed link affected by four parameters with a large variability. The performance of the proposed approach, in terms of parametric and stochastic analysis, is compared with the one provided by two state-of-the-art techniques, such as the combination of the principal components analysis (PCA) and the least-squares support vector machine (LS-SVM) regression and a multi-output feed-forward NN structure.","PeriodicalId":102131,"journal":{"name":"2022 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128776350","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 : 2022-07-06DOI: 10.1109/NEMO51452.2022.10038955
Á. F. Vaquero, Daniel Martinez-de-Rioja, E. Martinez‐de‐Rioja, M. Arrebola, J. Encinar, M. Pino
In this work a model to compute the near-field of an Intelligent Reflective Surface is presented. The proposed approach computes the near-field by means of the Huygens' Principle and the Principle of Superposition using the formulation of classical antenna apertures. The model is fully described and numerically simulated by designing a reflectarray at mmWave frequency and radiating in the Fresnel zone, similar to an IRS in an indoor scenario for 5G FR2 communications. The design is manufactured to experimentally validate the proposed model. The measurements agree with simulations for the copolar and cross-polar components of the radiated near-field. This approach presents a simply model to compute the near-field which provides a good prediction of the radiated near-field.
{"title":"Near-Field Model for the Computation of Coverage Generated by an IRS: Formulation and Validation","authors":"Á. F. Vaquero, Daniel Martinez-de-Rioja, E. Martinez‐de‐Rioja, M. Arrebola, J. Encinar, M. Pino","doi":"10.1109/NEMO51452.2022.10038955","DOIUrl":"https://doi.org/10.1109/NEMO51452.2022.10038955","url":null,"abstract":"In this work a model to compute the near-field of an Intelligent Reflective Surface is presented. The proposed approach computes the near-field by means of the Huygens' Principle and the Principle of Superposition using the formulation of classical antenna apertures. The model is fully described and numerically simulated by designing a reflectarray at mmWave frequency and radiating in the Fresnel zone, similar to an IRS in an indoor scenario for 5G FR2 communications. The design is manufactured to experimentally validate the proposed model. The measurements agree with simulations for the copolar and cross-polar components of the radiated near-field. This approach presents a simply model to compute the near-field which provides a good prediction of the radiated near-field.","PeriodicalId":102131,"journal":{"name":"2022 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121694013","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 : 2022-07-06DOI: 10.1109/NEMO51452.2022.10038524
Nhu-Huan Nguyen, A. Ghiotto, A. Vilcot, K. Wu, T. Vuong
This paper presents a multilayer phase shifter topology taking advantage of the air-filled substrate integrated waveguide (AFSIW) technology in the context of multilayer. By properly choosing the dimensions of this type of phase shifter, no additional transition is needed for matching purpose. Also, thanks to the AFSIW multilayer feature, a self-compensating effect is obtained, which allows realizing an equal-length configuration. For demonstrations, a phase shifter with a relative phase shift of 44.17 ± 5.64° is validated in measurement over the entire Ka-band. In this frequency range, an amplitude imbalance of −0.13 ± 0.44 dB is obtained. Nevertheless, the experiment validates the broadband responses with a return loss better than 11.33 dB. The proposed phase shifter structure allows realizing high-performance phase shifters without increasing the fabrication complexity.
{"title":"Self-matching Self-compensating Air-filled Substrate Integrated Waveguide (AFSIW) Phase Shifter","authors":"Nhu-Huan Nguyen, A. Ghiotto, A. Vilcot, K. Wu, T. Vuong","doi":"10.1109/NEMO51452.2022.10038524","DOIUrl":"https://doi.org/10.1109/NEMO51452.2022.10038524","url":null,"abstract":"This paper presents a multilayer phase shifter topology taking advantage of the air-filled substrate integrated waveguide (AFSIW) technology in the context of multilayer. By properly choosing the dimensions of this type of phase shifter, no additional transition is needed for matching purpose. Also, thanks to the AFSIW multilayer feature, a self-compensating effect is obtained, which allows realizing an equal-length configuration. For demonstrations, a phase shifter with a relative phase shift of 44.17 ± 5.64° is validated in measurement over the entire Ka-band. In this frequency range, an amplitude imbalance of −0.13 ± 0.44 dB is obtained. Nevertheless, the experiment validates the broadband responses with a return loss better than 11.33 dB. The proposed phase shifter structure allows realizing high-performance phase shifters without increasing the fabrication complexity.","PeriodicalId":102131,"journal":{"name":"2022 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121386806","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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