Pub Date : 2022-05-09DOI: 10.1109/mms55062.2022.9825567
T. K. Das, Ayona Chakraborty, S. Chatterjee, B. Gupta
The present article describes the performance of a fourth-order cross-coupled bandpass filter using double-folded microstrip hairpin resonators for the improvement of skirt characteristics and harmonics suppression. The proposed filter is centered at 2.5 GHz with a fractional bandwidth of 4%. At first, the central folded pair of resonators of the unit hairpin-line cell has been modified with periodic trapezoidal corrugations to achieve improved skirt characteristics with the attenuation level of 40 dB and a compact circuit area with a size reduction of 11.36% over the conventional cross-coupled filter with the same specifications. However, the harmonics have not been suppressed significantly by this compact structure. Subsequently, trapezoidal- shaped meander spurlines have been incorporated in each coupled section of the adjacent folded hairpin-line cells for achieving modal phase velocity compensation. As a result, an extended stopband with a rejection level of 34 dB up to 3.04f0 and an overall size reduction of 20.42 % has been achieved.
{"title":"Centrally Corrugated Cross-Coupled Wide Stopband Folded Bandpass Filter with Spurline","authors":"T. K. Das, Ayona Chakraborty, S. Chatterjee, B. Gupta","doi":"10.1109/mms55062.2022.9825567","DOIUrl":"https://doi.org/10.1109/mms55062.2022.9825567","url":null,"abstract":"The present article describes the performance of a fourth-order cross-coupled bandpass filter using double-folded microstrip hairpin resonators for the improvement of skirt characteristics and harmonics suppression. The proposed filter is centered at 2.5 GHz with a fractional bandwidth of 4%. At first, the central folded pair of resonators of the unit hairpin-line cell has been modified with periodic trapezoidal corrugations to achieve improved skirt characteristics with the attenuation level of 40 dB and a compact circuit area with a size reduction of 11.36% over the conventional cross-coupled filter with the same specifications. However, the harmonics have not been suppressed significantly by this compact structure. Subsequently, trapezoidal- shaped meander spurlines have been incorporated in each coupled section of the adjacent folded hairpin-line cells for achieving modal phase velocity compensation. As a result, an extended stopband with a rejection level of 34 dB up to 3.04f0 and an overall size reduction of 20.42 % has been achieved.","PeriodicalId":124088,"journal":{"name":"2022 Microwave Mediterranean Symposium (MMS)","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126185687","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 : 2022-05-09DOI: 10.1109/mms55062.2022.9825584
Fabio Weishaupt, Julius F. Tilly, N. Appenrodt, J. Dickmann, D. Heberling
With increasing levels of vehicle automation, the requirements for the sensors that are used for environment perception are rising at least as steadily. In automotive radars, the capability to perceive polarimetric information inspired some recent work to exploit this aspect in order to improve perception of static and dynamic surroundings. Such utilization requires a well-calibrated radar system. This paper demonstrates how to achieve the necessary stability in the scattering information of an automotive multiple input multiple output (MIMO) millimeter wave radar. The parameters of a fully polarimetric calibration are derived based on pole and dihedral target measurements in an automated test facility. Furthermore, the impact on the polarimetric quantities estimation due to mounting the radar behind a radome is analyzed.
{"title":"Calibration and Signal Processing of Polarimetric Radar Data in Automotive Applications","authors":"Fabio Weishaupt, Julius F. Tilly, N. Appenrodt, J. Dickmann, D. Heberling","doi":"10.1109/mms55062.2022.9825584","DOIUrl":"https://doi.org/10.1109/mms55062.2022.9825584","url":null,"abstract":"With increasing levels of vehicle automation, the requirements for the sensors that are used for environment perception are rising at least as steadily. In automotive radars, the capability to perceive polarimetric information inspired some recent work to exploit this aspect in order to improve perception of static and dynamic surroundings. Such utilization requires a well-calibrated radar system. This paper demonstrates how to achieve the necessary stability in the scattering information of an automotive multiple input multiple output (MIMO) millimeter wave radar. The parameters of a fully polarimetric calibration are derived based on pole and dihedral target measurements in an automated test facility. Furthermore, the impact on the polarimetric quantities estimation due to mounting the radar behind a radome is analyzed.","PeriodicalId":124088,"journal":{"name":"2022 Microwave Mediterranean Symposium (MMS)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126936175","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 : 2022-05-09DOI: 10.1109/mms55062.2022.9825523
Francesca Schenkel, Irwin Barengolts, Lisa Schmitt, I. Rolfes, M. Hoffmann, J. Barowski
This contribution presents designs, simulations, and characterizing measurements of silicon based metamaterial structures. In order to realize a micromachined THz waveguide system on a silicon wafer, mechanical fixtures to hold and to manipulate the waveguide are needed. If the dielectric constant of these structures is comparable to the waveguide itself, the field confinement is significantly reduced. Therefore, the material is structured as a metasurface using feature sizes that are much smaller than the wavelength. Thus, reducing the effective dielectric constant, while keeping a high mechanical stability. In this contribution the effective dielectric constant of this metamaterial is analyzed at around 300 GHz based on full-wave simulations and also investigated regarding its anisotropic behavior. The simulations are complemented and validated by measurements.
{"title":"Silicon based Metamaterials for Dielectric Waveguides in the THz Range","authors":"Francesca Schenkel, Irwin Barengolts, Lisa Schmitt, I. Rolfes, M. Hoffmann, J. Barowski","doi":"10.1109/mms55062.2022.9825523","DOIUrl":"https://doi.org/10.1109/mms55062.2022.9825523","url":null,"abstract":"This contribution presents designs, simulations, and characterizing measurements of silicon based metamaterial structures. In order to realize a micromachined THz waveguide system on a silicon wafer, mechanical fixtures to hold and to manipulate the waveguide are needed. If the dielectric constant of these structures is comparable to the waveguide itself, the field confinement is significantly reduced. Therefore, the material is structured as a metasurface using feature sizes that are much smaller than the wavelength. Thus, reducing the effective dielectric constant, while keeping a high mechanical stability. In this contribution the effective dielectric constant of this metamaterial is analyzed at around 300 GHz based on full-wave simulations and also investigated regarding its anisotropic behavior. The simulations are complemented and validated by measurements.","PeriodicalId":124088,"journal":{"name":"2022 Microwave Mediterranean Symposium (MMS)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126550219","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 : 2022-05-09DOI: 10.1109/mms55062.2022.9825578
R. Colella, F. Chietera, G. Montisci, G. Muntoni, G. Casula, L. Catarinucci
New possibilities in antenna and microwave manufacturing are opening up through the exploitation of additive manufacturing (AM) 3D printing techniques. Despite being used primarily for the fabrication of dielectric structures, with the right filament, these procedures could also be able to print conductive parts, giving birth to true fully-3D-printed radiating elements. However, to take full advantage of these thermoplastic materials, a rigorous electromagnetic characterization needs to be performed. Based on this, the dielectric properties of one of the most common plastic 3D-printable materials are investigated, and, in addition, the electric conductivity of one of the most promising conductive filaments (Electrifi) is experimentally evaluated in a wide frequency range (0.5-7.5 GHz) and then validated in the design of different fully-3D-printable patch antennas.
{"title":"Electromagnetic Evaluation of Conductive and Dielectric Thermoplastic Materials Suitable for Designing Fully-3D-Printable RF Devices","authors":"R. Colella, F. Chietera, G. Montisci, G. Muntoni, G. Casula, L. Catarinucci","doi":"10.1109/mms55062.2022.9825578","DOIUrl":"https://doi.org/10.1109/mms55062.2022.9825578","url":null,"abstract":"New possibilities in antenna and microwave manufacturing are opening up through the exploitation of additive manufacturing (AM) 3D printing techniques. Despite being used primarily for the fabrication of dielectric structures, with the right filament, these procedures could also be able to print conductive parts, giving birth to true fully-3D-printed radiating elements. However, to take full advantage of these thermoplastic materials, a rigorous electromagnetic characterization needs to be performed. Based on this, the dielectric properties of one of the most common plastic 3D-printable materials are investigated, and, in addition, the electric conductivity of one of the most promising conductive filaments (Electrifi) is experimentally evaluated in a wide frequency range (0.5-7.5 GHz) and then validated in the design of different fully-3D-printable patch antennas.","PeriodicalId":124088,"journal":{"name":"2022 Microwave Mediterranean Symposium (MMS)","volume":"137 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122656819","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 : 2022-05-09DOI: 10.1109/mms55062.2022.9825623
S. Gallucci, M. Bonato, M. Benini, E. Chiaramello, S. Fiocchi, G. Tognola, M. Parazzini
A novel technology that has been spreading in recent years is the wearable one. It has wide variety of applications, from the medical field to the military one. From the point of view of the human exposure, the wearable devices are interesting because the antenna is posed on the human body, directly involving the human tissues in the exposure. Moreover, since the antenna is integrated in the human clothes, it is very likely that it could modify its position. For this reason, in this work the exposure assessment has been performed by means of stochastic dosimetry, in order to evaluate the effect of the variation of the antenna positions on the exposure level. In this work, a surrogate model was obtained that makes possible the exposure assessment in 1000 different positions of the antenna, with a computational cost significantly lower than the deterministic dosimetry and describing the exposure with an error below the 3%.
{"title":"Human RF-EMF Exposure Assessment for a Wearable Device by Stochastic Dosimetry","authors":"S. Gallucci, M. Bonato, M. Benini, E. Chiaramello, S. Fiocchi, G. Tognola, M. Parazzini","doi":"10.1109/mms55062.2022.9825623","DOIUrl":"https://doi.org/10.1109/mms55062.2022.9825623","url":null,"abstract":"A novel technology that has been spreading in recent years is the wearable one. It has wide variety of applications, from the medical field to the military one. From the point of view of the human exposure, the wearable devices are interesting because the antenna is posed on the human body, directly involving the human tissues in the exposure. Moreover, since the antenna is integrated in the human clothes, it is very likely that it could modify its position. For this reason, in this work the exposure assessment has been performed by means of stochastic dosimetry, in order to evaluate the effect of the variation of the antenna positions on the exposure level. In this work, a surrogate model was obtained that makes possible the exposure assessment in 1000 different positions of the antenna, with a computational cost significantly lower than the deterministic dosimetry and describing the exposure with an error below the 3%.","PeriodicalId":124088,"journal":{"name":"2022 Microwave Mediterranean Symposium (MMS)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124745437","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 : 2022-05-09DOI: 10.1109/mms55062.2022.9825619
M. I. Nawaz, Yunus Erdem Aras, S. Zafar, Büşra Çankaya Akoğlu, Gizem Tendurus, E. Ozbay
Cascode HEMTs exhibit better stability and broad bandwidths performance as compared with common source HEMTs. This paper presents the design of a single stage broadband low noise amplifier based upon 0.15 um GaN HEMT technology in the frequency range of 8 – 12 GHz. Cascode HEMT with inductive source degeneration is utilized. All the design work is done using PathWave Advanced Design System. The LNA provides 9.5 to 10.6 dB with input return loss better than 10 dB and output return loss better than 8 dB in the whole band. The noise figure of the amplifier is below 1.9 dB. The linearity parameters P1dB and OIP3 are greater than equal to 16 dBm and 28 dBm respectively within operating bandwidth. The noise figure of the amplifier is fairly constant over 30 mA to 60 mA bias currents and 9 V – 18 V operating bias voltage. This is a unique finding which is being reported for the first time to the best of authors' knowledge.
与普通源hemt相比，级联hemt具有更好的稳定性和宽带性能。本文设计了一种基于0.15 um GaN HEMT技术的单级宽带低噪声放大器，工作频率为8 ~ 12 GHz。利用感应源退化的级联HEMT。所有的设计工作都是使用PathWave高级设计系统完成的。LNA提供9.5 ~ 10.6 dB，全频段输入回波损耗小于10 dB，输出回波损耗小于8 dB。放大器的噪声系数在1.9 dB以下。在工作带宽内，线性度参数P1dB和OIP3分别大于等于16 dBm和28 dBm。放大器的噪声系数在30 mA至60 mA的偏置电流和9 V至18 V的工作偏置电压下相当恒定。这是一个独特的发现，据作者所知，这是第一次被报道。
{"title":"X-band Cascode LNA with Bias-invariant Noise Figure using 0.15 µm GaN-on-SiC Technology","authors":"M. I. Nawaz, Yunus Erdem Aras, S. Zafar, Büşra Çankaya Akoğlu, Gizem Tendurus, E. Ozbay","doi":"10.1109/mms55062.2022.9825619","DOIUrl":"https://doi.org/10.1109/mms55062.2022.9825619","url":null,"abstract":"Cascode HEMTs exhibit better stability and broad bandwidths performance as compared with common source HEMTs. This paper presents the design of a single stage broadband low noise amplifier based upon 0.15 um GaN HEMT technology in the frequency range of 8 – 12 GHz. Cascode HEMT with inductive source degeneration is utilized. All the design work is done using PathWave Advanced Design System. The LNA provides 9.5 to 10.6 dB with input return loss better than 10 dB and output return loss better than 8 dB in the whole band. The noise figure of the amplifier is below 1.9 dB. The linearity parameters P1dB and OIP3 are greater than equal to 16 dBm and 28 dBm respectively within operating bandwidth. The noise figure of the amplifier is fairly constant over 30 mA to 60 mA bias currents and 9 V – 18 V operating bias voltage. This is a unique finding which is being reported for the first time to the best of authors' knowledge.","PeriodicalId":124088,"journal":{"name":"2022 Microwave Mediterranean Symposium (MMS)","volume":"58 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134175097","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 : 2022-05-09DOI: 10.1109/mms55062.2022.9825581
M. Colella, M. Biscarini, Marco de Meis, R. Patrizi, Tino Ciallella, M. Cavagnaro, F. Apollonio, M. Liberti
In this work, near field exposure of the military crew to a vehicular antenna was investigated in a realistic scenario. The aim was to deepen the knowledge of induced electric (E-)field and SAR inside the human body (i.e. Duke, ViP, v.3) when it is standing partially outside the vehicle, in close proximity of the radiating antenna. Dosimetric results obtained at 16 MHz showed that, while the intensity of the radiated electromagnetic field exceeds guidelines reference limits, the E-field and SAR values induced inside the body remain well below the safety limits.
{"title":"Human Body Exposure to a Vehicular Antenna: a Numerical Study in a Realistic Military Scenario","authors":"M. Colella, M. Biscarini, Marco de Meis, R. Patrizi, Tino Ciallella, M. Cavagnaro, F. Apollonio, M. Liberti","doi":"10.1109/mms55062.2022.9825581","DOIUrl":"https://doi.org/10.1109/mms55062.2022.9825581","url":null,"abstract":"In this work, near field exposure of the military crew to a vehicular antenna was investigated in a realistic scenario. The aim was to deepen the knowledge of induced electric (E-)field and SAR inside the human body (i.e. Duke, ViP, v.3) when it is standing partially outside the vehicle, in close proximity of the radiating antenna. Dosimetric results obtained at 16 MHz showed that, while the intensity of the radiated electromagnetic field exceeds guidelines reference limits, the E-field and SAR values induced inside the body remain well below the safety limits.","PeriodicalId":124088,"journal":{"name":"2022 Microwave Mediterranean Symposium (MMS)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114370675","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 : 2022-05-09DOI: 10.1109/mms55062.2022.9825556
L. Mescia, C. Lamacchia, A. Berardi, A. Leone, A. Tamborrino
This paper outlines the development of a contin-uous microwave-assisted pilot plant for almond disinfestation. A coupled thermal and electromagnetic model was defined in order to predict the temperature profile inside the treatment chamber. Then, a microwave apparatus having five generators suitably placed along the treatment chamber was numerically investigated. Therefore, to test the efficacy of microwaves in pest control of stored almonds, a pilot plant was developed and preliminary tested under variable operating conditions.
{"title":"Continuous microwave pilot plant for almond disinfestation: preliminary tests","authors":"L. Mescia, C. Lamacchia, A. Berardi, A. Leone, A. Tamborrino","doi":"10.1109/mms55062.2022.9825556","DOIUrl":"https://doi.org/10.1109/mms55062.2022.9825556","url":null,"abstract":"This paper outlines the development of a contin-uous microwave-assisted pilot plant for almond disinfestation. A coupled thermal and electromagnetic model was defined in order to predict the temperature profile inside the treatment chamber. Then, a microwave apparatus having five generators suitably placed along the treatment chamber was numerically investigated. Therefore, to test the efficacy of microwaves in pest control of stored almonds, a pilot plant was developed and preliminary tested under variable operating conditions.","PeriodicalId":124088,"journal":{"name":"2022 Microwave Mediterranean Symposium (MMS)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125874515","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 : 2022-05-09DOI: 10.1109/mms55062.2022.9825587
A. Monti, S. Vellucci, M. Barbuto, M. Longhi, D. Ramaccia, A. Toscano, F. Bilotti
In this contribution, we describe a simple and effective approach for the design of phase-gradient metasurfaces based on Huygens cells for oblique incidence. The approach is based on conventional microwave networks and accounts for off-normal incidence onto the cells and for their different response for the two orthogonal polarizations. In addition, it is reported a simple example in which the performance of the angularly-optimized phase-gradient metasurface is compared to the one of an equivalent device designed under normal incidence condition.
{"title":"Optimal Design of Huygens Metasurfaces for Oblique Incidence through a Microwave Network Approach","authors":"A. Monti, S. Vellucci, M. Barbuto, M. Longhi, D. Ramaccia, A. Toscano, F. Bilotti","doi":"10.1109/mms55062.2022.9825587","DOIUrl":"https://doi.org/10.1109/mms55062.2022.9825587","url":null,"abstract":"In this contribution, we describe a simple and effective approach for the design of phase-gradient metasurfaces based on Huygens cells for oblique incidence. The approach is based on conventional microwave networks and accounts for off-normal incidence onto the cells and for their different response for the two orthogonal polarizations. In addition, it is reported a simple example in which the performance of the angularly-optimized phase-gradient metasurface is compared to the one of an equivalent device designed under normal incidence condition.","PeriodicalId":124088,"journal":{"name":"2022 Microwave Mediterranean Symposium (MMS)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125982062","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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