Pub Date : 2022-05-16DOI: 10.1109/iWAT54881.2022.9811039
Abel Zandamela, N. Marchetti, A. Narbudowicz
In this work we propose a compact Multiple-Input Multiple-Output (MIMO) antenna for wrist-worn devices. The design is capable of unidirectional beamsteering across the entire horizontal plane, a property that is exploited for Angle of Arrival (AoA) Estimation based localization applications. The performance of the proposed system is evaluated using the high-resolution MUltiple SIgnal Classification (MUSIC) algorithm. Full -wave simulated results of the antenna in free-space show a peak realized gain of 5 dBi and estimated mean absolute errors < 0.36°. The gain and the estimated errors change to respectively 4.26 dBi and 0.45°, when using a human forearm phantom. The achieved results demonstrate the feasibility of the proposed antenna for localization applications using compact wrist-worn devices.
{"title":"Compact MIMO Antenna for MUSIC-Based Angle of Arrival Estimation in Wrist-Worn Devices","authors":"Abel Zandamela, N. Marchetti, A. Narbudowicz","doi":"10.1109/iWAT54881.2022.9811039","DOIUrl":"https://doi.org/10.1109/iWAT54881.2022.9811039","url":null,"abstract":"In this work we propose a compact Multiple-Input Multiple-Output (MIMO) antenna for wrist-worn devices. The design is capable of unidirectional beamsteering across the entire horizontal plane, a property that is exploited for Angle of Arrival (AoA) Estimation based localization applications. The performance of the proposed system is evaluated using the high-resolution MUltiple SIgnal Classification (MUSIC) algorithm. Full -wave simulated results of the antenna in free-space show a peak realized gain of 5 dBi and estimated mean absolute errors < 0.36°. The gain and the estimated errors change to respectively 4.26 dBi and 0.45°, when using a human forearm phantom. The achieved results demonstrate the feasibility of the proposed antenna for localization applications using compact wrist-worn devices.","PeriodicalId":106416,"journal":{"name":"2022 International Workshop on Antenna Technology (iWAT)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122231644","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 : 2022-05-16DOI: 10.1109/iWAT54881.2022.9811091
T. Sakamoto, Junya Suzuguchi
This study proposes a fast blind signal separation technique for human arterial pulse wave propagation measurement. One of the authors previously developed a blind signal separation method called physiological component analysis that uses mathematical modeling of the measured physiological signals, including the pulse wave propagation, and this method improves the signal separation accuracy when applied to array signal processing. Physiological component analysis, however, is known to require long computation times because it is based on high-dimensional global optimization. In this paper, we propose a method to reduce the dimensionality of the decision variables for the optimization process that uses the Schelkunoff polynomial method. Using this dimension reduction technique, we propose a new algorithm, called fast physiological component analysis, and the performance of this algorithm is evaluated using numerical simulations.
{"title":"Radar-based Measurement of Pulse Wave using Fast Physiological Component Analysis","authors":"T. Sakamoto, Junya Suzuguchi","doi":"10.1109/iWAT54881.2022.9811091","DOIUrl":"https://doi.org/10.1109/iWAT54881.2022.9811091","url":null,"abstract":"This study proposes a fast blind signal separation technique for human arterial pulse wave propagation measurement. One of the authors previously developed a blind signal separation method called physiological component analysis that uses mathematical modeling of the measured physiological signals, including the pulse wave propagation, and this method improves the signal separation accuracy when applied to array signal processing. Physiological component analysis, however, is known to require long computation times because it is based on high-dimensional global optimization. In this paper, we propose a method to reduce the dimensionality of the decision variables for the optimization process that uses the Schelkunoff polynomial method. Using this dimension reduction technique, we propose a new algorithm, called fast physiological component analysis, and the performance of this algorithm is evaluated using numerical simulations.","PeriodicalId":106416,"journal":{"name":"2022 International Workshop on Antenna Technology (iWAT)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126509493","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 : 2022-05-16DOI: 10.1109/iWAT54881.2022.9811044
Grazia Cappiello, A. Bottiglieri, Caoimhe Newell, G. Rahmani, Richard Farnan, L. Farina, Russell Senanyake, M. Gurnell, P. Prakash, Martin O'Halloran, Michael Conall Dennedy
Microwave thermal ablation is a minimally invasive technique under investigation for treatment of adrenal adenomas. This therapy uses microwave antennas to deliver localised electromagnetic energy to tissue where the energy is absorbed as heat. A challenge for adrenal ablation is to focus the heating in small zones while minimizing thermal damage to the adjacent healthy tissue in such a way to preserve the adrenal function. This work aims to develop treatment planning to predict the ablation zone and deliver the thermal therapy safely and effectively.
{"title":"Ablation Treatment Planning for Patients with Primary Aldosteronism","authors":"Grazia Cappiello, A. Bottiglieri, Caoimhe Newell, G. Rahmani, Richard Farnan, L. Farina, Russell Senanyake, M. Gurnell, P. Prakash, Martin O'Halloran, Michael Conall Dennedy","doi":"10.1109/iWAT54881.2022.9811044","DOIUrl":"https://doi.org/10.1109/iWAT54881.2022.9811044","url":null,"abstract":"Microwave thermal ablation is a minimally invasive technique under investigation for treatment of adrenal adenomas. This therapy uses microwave antennas to deliver localised electromagnetic energy to tissue where the energy is absorbed as heat. A challenge for adrenal ablation is to focus the heating in small zones while minimizing thermal damage to the adjacent healthy tissue in such a way to preserve the adrenal function. This work aims to develop treatment planning to predict the ablation zone and deliver the thermal therapy safely and effectively.","PeriodicalId":106416,"journal":{"name":"2022 International Workshop on Antenna Technology (iWAT)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129365104","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 : 2022-05-16DOI: 10.1109/iWAT54881.2022.9811069
Shaoqing Hu, A. Molaei, O. Yurduseven
This paper introduces two fast imaging algorithms based on Fast Fourier Transform (FFT) for a 220 GHz synthetic aperture imaging. The presented application is a target detection scenario with a multi-static multiple-input and multiple-output (MIMO) array-FFT/IFFT approach and a FFT matched filtering. Zero padding is proposed to improve the image quality when large sampling space is used. In addition, a multi-pass synthetic aperture imaging is proposed to achieve a higher image quality without increasing the system cost. An imaging resolution of 6 mm at 1.4 m is achieved together a reconstruction time of as small as 0.2 s to image a scene of 200 mm × 200 mm. The proposed sparse imaging with low rank matrix recovery (LRMR) technique has significant potential to reduce the system cost without comprising on high image quality.
{"title":"FFT-based 220 GHz Sparse Imaging for Target Detection","authors":"Shaoqing Hu, A. Molaei, O. Yurduseven","doi":"10.1109/iWAT54881.2022.9811069","DOIUrl":"https://doi.org/10.1109/iWAT54881.2022.9811069","url":null,"abstract":"This paper introduces two fast imaging algorithms based on Fast Fourier Transform (FFT) for a 220 GHz synthetic aperture imaging. The presented application is a target detection scenario with a multi-static multiple-input and multiple-output (MIMO) array-FFT/IFFT approach and a FFT matched filtering. Zero padding is proposed to improve the image quality when large sampling space is used. In addition, a multi-pass synthetic aperture imaging is proposed to achieve a higher image quality without increasing the system cost. An imaging resolution of 6 mm at 1.4 m is achieved together a reconstruction time of as small as 0.2 s to image a scene of 200 mm × 200 mm. The proposed sparse imaging with low rank matrix recovery (LRMR) technique has significant potential to reduce the system cost without comprising on high image quality.","PeriodicalId":106416,"journal":{"name":"2022 International Workshop on Antenna Technology (iWAT)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125427155","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 : 2022-05-16DOI: 10.1109/iWAT54881.2022.9810905
J. T. Tobon Vasquez, D. Rodriguez-Duarte, C. Origlia, G. Turvani, R. Scapaticci, M. Casu, L. Crocco, F. Vipiana
This paper summarizes the development and the experimental testing of a scanning device, in the microwave range, to monitor brain stroke. The device comprehends 4 main sections: a sensors helmet, a switching matrix, a data acquisition part, and a control/processing core. The sensors in the helmet are 22 custom-made flexible antennas working around 1GHz, placed conformally to the upper head part. A first validation of the system consists in the detection of a target in the head region. Experimental testing is performed on a single-cavity head phantom, while the target is a balloon mimicking the stroke. The shape of the balloon and phantom are extracted from medical images, and tissues properties are emulated with liquids that resemble their dielectric properties. A differential measurement approach senses the field on the antennas in two different situations, and from their difference computes a 3-D image through a singular value decomposition of the discretized scattering operator obtained from an accurate numerical model. The results verify the capabilities of the system on detecting and monitoring stroke evolution.
{"title":"Microwave Imaging Device Prototype for Brain Stroke 3D Monitoring","authors":"J. T. Tobon Vasquez, D. Rodriguez-Duarte, C. Origlia, G. Turvani, R. Scapaticci, M. Casu, L. Crocco, F. Vipiana","doi":"10.1109/iWAT54881.2022.9810905","DOIUrl":"https://doi.org/10.1109/iWAT54881.2022.9810905","url":null,"abstract":"This paper summarizes the development and the experimental testing of a scanning device, in the microwave range, to monitor brain stroke. The device comprehends 4 main sections: a sensors helmet, a switching matrix, a data acquisition part, and a control/processing core. The sensors in the helmet are 22 custom-made flexible antennas working around 1GHz, placed conformally to the upper head part. A first validation of the system consists in the detection of a target in the head region. Experimental testing is performed on a single-cavity head phantom, while the target is a balloon mimicking the stroke. The shape of the balloon and phantom are extracted from medical images, and tissues properties are emulated with liquids that resemble their dielectric properties. A differential measurement approach senses the field on the antennas in two different situations, and from their difference computes a 3-D image through a singular value decomposition of the discretized scattering operator obtained from an accurate numerical model. The results verify the capabilities of the system on detecting and monitoring stroke evolution.","PeriodicalId":106416,"journal":{"name":"2022 International Workshop on Antenna Technology (iWAT)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130219252","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 : 2022-05-16DOI: 10.1109/iWAT54881.2022.9811019
Ogbonnaya Anicho, P. Charlesworth, G. Baicher, Atulya Nagar
This paper examines antenna implementations for the different communication links in a HAPS network i.e. service, inter-HAPS and feeder links. In this context, antenna implementation covers form-factor, size, steering and platform mounting templates. Antenna implementations vary significantly from one HAPS platform to another including proprietary and regulatory induced variations. Achieving the levels of link stability and performance demanded by current digital trends involves a steep technology and cost curve. This work proposes standardisation of HAPS antenna implementation to harmonise how antennas are implemented from design to installation. Accelerating the adoption of HAPS will require innovation at all levels of the HAPS technology value chain and antenna implementation is high up this chain.
{"title":"Antenna Implementations for High Altitude Platform Stations (HAPS) and considerations for future designs","authors":"Ogbonnaya Anicho, P. Charlesworth, G. Baicher, Atulya Nagar","doi":"10.1109/iWAT54881.2022.9811019","DOIUrl":"https://doi.org/10.1109/iWAT54881.2022.9811019","url":null,"abstract":"This paper examines antenna implementations for the different communication links in a HAPS network i.e. service, inter-HAPS and feeder links. In this context, antenna implementation covers form-factor, size, steering and platform mounting templates. Antenna implementations vary significantly from one HAPS platform to another including proprietary and regulatory induced variations. Achieving the levels of link stability and performance demanded by current digital trends involves a steep technology and cost curve. This work proposes standardisation of HAPS antenna implementation to harmonise how antennas are implemented from design to installation. Accelerating the adoption of HAPS will require innovation at all levels of the HAPS technology value chain and antenna implementation is high up this chain.","PeriodicalId":106416,"journal":{"name":"2022 International Workshop on Antenna Technology (iWAT)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130794037","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 : 2022-05-16DOI: 10.1109/iWAT54881.2022.9811029
Q. You, Yi Wang, Nathan Miller
This paper presents some recent development work on planar waveguide array antennas for 5G backhaul and satellite communications. Several design examples are provided, focusing on the design challenges of side-lobe suppression, dual-band dual-polarisation, and beam scanning. Aperture rotation and polarization rotation are two approaches used for side-lobe suppression. Their trade-off with cross polarization discrimination has been discussed. Examples of dual-polarisation wideband or dual-band arrays are given. Finally, variable inclination continuous transverse stub (ViCTS) antenna is discussed as a potential cost-effective solution to phase arrays in satellite communications. All the presented antennas are based on hollow waveguides constructed using multiple layers.
{"title":"High-Efficiency Low-Profile Waveguide Array Antennas","authors":"Q. You, Yi Wang, Nathan Miller","doi":"10.1109/iWAT54881.2022.9811029","DOIUrl":"https://doi.org/10.1109/iWAT54881.2022.9811029","url":null,"abstract":"This paper presents some recent development work on planar waveguide array antennas for 5G backhaul and satellite communications. Several design examples are provided, focusing on the design challenges of side-lobe suppression, dual-band dual-polarisation, and beam scanning. Aperture rotation and polarization rotation are two approaches used for side-lobe suppression. Their trade-off with cross polarization discrimination has been discussed. Examples of dual-polarisation wideband or dual-band arrays are given. Finally, variable inclination continuous transverse stub (ViCTS) antenna is discussed as a potential cost-effective solution to phase arrays in satellite communications. All the presented antennas are based on hollow waveguides constructed using multiple layers.","PeriodicalId":106416,"journal":{"name":"2022 International Workshop on Antenna Technology (iWAT)","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134084807","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 : 2022-05-16DOI: 10.1109/iWAT54881.2022.9811055
T. Rommel
The German Aerospace Center (DLR) is currently developing a ground-based Synthetic Aperture Radar (SAR) with digital beamforming (DBF) capabilities for versatile scientific use. Primary focus of the project is on the reflector antenna and on the implementation of onboard DBF pre-processing concepts & data reduction in real-time. This paper describes the innovative contributions and challenges during the X-band offset reflector antenna design with 4x32 dual-polarized feed elements at a center frequency of 9.6 GHz.
{"title":"DLR’s Dual-Polarized Offset Reflector Antenna with Digital Feed Array for Synthetic Aperture Radar","authors":"T. Rommel","doi":"10.1109/iWAT54881.2022.9811055","DOIUrl":"https://doi.org/10.1109/iWAT54881.2022.9811055","url":null,"abstract":"The German Aerospace Center (DLR) is currently developing a ground-based Synthetic Aperture Radar (SAR) with digital beamforming (DBF) capabilities for versatile scientific use. Primary focus of the project is on the reflector antenna and on the implementation of onboard DBF pre-processing concepts & data reduction in real-time. This paper describes the innovative contributions and challenges during the X-band offset reflector antenna design with 4x32 dual-polarized feed elements at a center frequency of 9.6 GHz.","PeriodicalId":106416,"journal":{"name":"2022 International Workshop on Antenna Technology (iWAT)","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132216996","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 : 2022-05-16DOI: 10.1109/iWAT54881.2022.9810997
A. Boursianis, Maria S. Papadopoulou, M. Salucci, A. Polo, P. Sarigiannidis, S. Koulouridis, S. Goudos
The interest in Frequency Selective Surfaces has been raised during the last years, mostly due to the advent of 5G cellular communication networks. As electromagnetic structures with diverse characteristics, FSSs can provide comparative advantages in 5G communication systems. In this paper, we design and optimize an FSS, which acts as an absorber in the 5G NR n78 frequency band. As an optimizer, we utilize a meta-heuristic swarm intelligence algorithm, i.e., the Coot Optimization Algorithm. The selected algorithm performs the optimization method both to the unit cell and the corresponding FSS structure. Computed results demonstrate quite satisfactory performance of the presented FSS design, in terms of the minimum reflection coefficient, the maximum realized gain, and the maximum efficiency making it a promising candidate for 5G applications.
在过去几年中，对频率选择表面的兴趣已经提高，主要是由于5G蜂窝通信网络的出现。fss作为具有多种特性的电磁结构，在5G通信系统中具有比较优势。在本文中，我们设计和优化了一个FSS，作为5G NR n78频段的吸收器。作为优化器，我们使用了一种元启发式群体智能算法，即库特优化算法。所选择的算法同时对单元胞和相应的FSS结构执行优化方法。计算结果表明，所提出的FSS设计在最小反射系数、最大实现增益和最大效率方面具有令人满意的性能，使其成为5G应用的有希望的候选器件。
{"title":"Frequency Selective Surface Design Using Coot Optimization Algorithm for 5G Applications","authors":"A. Boursianis, Maria S. Papadopoulou, M. Salucci, A. Polo, P. Sarigiannidis, S. Koulouridis, S. Goudos","doi":"10.1109/iWAT54881.2022.9810997","DOIUrl":"https://doi.org/10.1109/iWAT54881.2022.9810997","url":null,"abstract":"The interest in Frequency Selective Surfaces has been raised during the last years, mostly due to the advent of 5G cellular communication networks. As electromagnetic structures with diverse characteristics, FSSs can provide comparative advantages in 5G communication systems. In this paper, we design and optimize an FSS, which acts as an absorber in the 5G NR n78 frequency band. As an optimizer, we utilize a meta-heuristic swarm intelligence algorithm, i.e., the Coot Optimization Algorithm. The selected algorithm performs the optimization method both to the unit cell and the corresponding FSS structure. Computed results demonstrate quite satisfactory performance of the presented FSS design, in terms of the minimum reflection coefficient, the maximum realized gain, and the maximum efficiency making it a promising candidate for 5G applications.","PeriodicalId":106416,"journal":{"name":"2022 International Workshop on Antenna Technology (iWAT)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133740183","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 : 2022-05-16DOI: 10.1109/iWAT54881.2022.9811002
Andreea Constantin, R. Tamas
Measurements in anechoic chambers do not provide reliable results below a cut-off frequency defined based on the absorber reflectivity. Such a parameter should be assessed in order to further develop data-processing techniques for removing multipath effects at low frequencies. In this paper we propose a single antenna method for characterizing absorber effectiveness by measuring the reflection coefficient at the antenna input over a set of distances between the measuring antenna and the reflecting wall. We used as a probe a low-profile, bowtie antenna and a mobile, controlled platform. In order to improve the directivity, we applied an end-fire type weighting on the measured data. The contribution of the wall reflection at the antenna input, was extracted through a differential method based on computing an estimate of the S11 parameter in a reflectionless environment by using the distance averaging method. The technique was successfully demonstrated in an anechoic chamber normally designed to operate over 700 MHz.
{"title":"A Single Antenna Method for Characterizing Absorber Effectiveness at Low Frequency","authors":"Andreea Constantin, R. Tamas","doi":"10.1109/iWAT54881.2022.9811002","DOIUrl":"https://doi.org/10.1109/iWAT54881.2022.9811002","url":null,"abstract":"Measurements in anechoic chambers do not provide reliable results below a cut-off frequency defined based on the absorber reflectivity. Such a parameter should be assessed in order to further develop data-processing techniques for removing multipath effects at low frequencies. In this paper we propose a single antenna method for characterizing absorber effectiveness by measuring the reflection coefficient at the antenna input over a set of distances between the measuring antenna and the reflecting wall. We used as a probe a low-profile, bowtie antenna and a mobile, controlled platform. In order to improve the directivity, we applied an end-fire type weighting on the measured data. The contribution of the wall reflection at the antenna input, was extracted through a differential method based on computing an estimate of the S11 parameter in a reflectionless environment by using the distance averaging method. The technique was successfully demonstrated in an anechoic chamber normally designed to operate over 700 MHz.","PeriodicalId":106416,"journal":{"name":"2022 International Workshop on Antenna Technology (iWAT)","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133458403","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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