Pub Date : 1900-01-01DOI: 10.23919/USNC-URSI-NRSM.2019.8712903
Jing Wang, Changzhi Li
This paper presents an integrated portable multi-mode radar system incorporating Doppler, frequency-shift keying (FSK), and frequency-modulated continuous-wave (FMCW) modes with an analog DC offset baseband cancellation circuit. The proposed radar system can be used for various biomedical applications such as non-contact vital signs monitoring, fall detection, and human tracking. A common problem of biomedical radar sensors is the DC offset presented at the output of the mixer caused by hardware imperfection and reflections from nearby stationary objects. This leads to signal distortion, baseband amplifier saturation, and dynamic range reduction. Therefore, an analog DC offset cancellation circuit is integrated to automatically and continuously remove the DC offset before baseband amplification. Experiment results of different modes are reported to demonstrate the multi-functionality of the proposed radar.
{"title":"A Portable Doppler/FSK/FMCW Multi-mode Radar With Analog DC Offset Cancellation for Biomedical Applications","authors":"Jing Wang, Changzhi Li","doi":"10.23919/USNC-URSI-NRSM.2019.8712903","DOIUrl":"https://doi.org/10.23919/USNC-URSI-NRSM.2019.8712903","url":null,"abstract":"This paper presents an integrated portable multi-mode radar system incorporating Doppler, frequency-shift keying (FSK), and frequency-modulated continuous-wave (FMCW) modes with an analog DC offset baseband cancellation circuit. The proposed radar system can be used for various biomedical applications such as non-contact vital signs monitoring, fall detection, and human tracking. A common problem of biomedical radar sensors is the DC offset presented at the output of the mixer caused by hardware imperfection and reflections from nearby stationary objects. This leads to signal distortion, baseband amplifier saturation, and dynamic range reduction. Therefore, an analog DC offset cancellation circuit is integrated to automatically and continuously remove the DC offset before baseband amplification. Experiment results of different modes are reported to demonstrate the multi-functionality of the proposed radar.","PeriodicalId":142320,"journal":{"name":"2019 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124295610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.23919/USNC-URSI-NRSM.2019.8713132
Ali Hosseini-Fahraji, K. Zeng, Yaling Yang, M. Manteghi
This paper proposes a self-sustaining maritime mesh network. The system consists of two components, energy harvesting buoys, and wireless mesh routers. The radios operate in the white space frequency band. The white space routers were designed and prototyped. A pair of these systems was used in a communication link in the Claytor Lake. An ocean-surface simulator is designed and used to predict the height of the buoys and ocean waves to assist the communication protocol to maintain connectivity. The measurement shows 2 Mbps UDP throughput at a radius of 5 km on the lake.
{"title":"A Self-Sustaining Maritime Mesh Network","authors":"Ali Hosseini-Fahraji, K. Zeng, Yaling Yang, M. Manteghi","doi":"10.23919/USNC-URSI-NRSM.2019.8713132","DOIUrl":"https://doi.org/10.23919/USNC-URSI-NRSM.2019.8713132","url":null,"abstract":"This paper proposes a self-sustaining maritime mesh network. The system consists of two components, energy harvesting buoys, and wireless mesh routers. The radios operate in the white space frequency band. The white space routers were designed and prototyped. A pair of these systems was used in a communication link in the Claytor Lake. An ocean-surface simulator is designed and used to predict the height of the buoys and ocean waves to assist the communication protocol to maintain connectivity. The measurement shows 2 Mbps UDP throughput at a radius of 5 km on the lake.","PeriodicalId":142320,"journal":{"name":"2019 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM)","volume":"15 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122478434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.23919/USNC-URSI-NRSM.2019.8713021
Behzad Koosha, H. Helgert, R. Karimian
In this paper, we discuss and propose a novel & hybrid approach for future High Throughput Satellite (HTS) networks using beam hopping and comparing the overall performance and capabilities of the proposed solution. This work focuses on a time switched payload configuration by monitoring the system resources and traffic demands based on geographical distribution. The proposed work, develops a standard protocol between satellite operators’ Network Management System (NMS) and their telemetry, tracking and control (TT&C) division to enhance overall efficiency of HTS networks which results in reducing the operational cost and boosting users’ overall experience.
{"title":"A Hybrid Beam Hopping Design for Non-uniform Traffic in HTS Networks","authors":"Behzad Koosha, H. Helgert, R. Karimian","doi":"10.23919/USNC-URSI-NRSM.2019.8713021","DOIUrl":"https://doi.org/10.23919/USNC-URSI-NRSM.2019.8713021","url":null,"abstract":"In this paper, we discuss and propose a novel & hybrid approach for future High Throughput Satellite (HTS) networks using beam hopping and comparing the overall performance and capabilities of the proposed solution. This work focuses on a time switched payload configuration by monitoring the system resources and traffic demands based on geographical distribution. The proposed work, develops a standard protocol between satellite operators’ Network Management System (NMS) and their telemetry, tracking and control (TT&C) division to enhance overall efficiency of HTS networks which results in reducing the operational cost and boosting users’ overall experience.","PeriodicalId":142320,"journal":{"name":"2019 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132003117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.23919/USNC-URSI-NRSM.2019.8713027
P. Nayeri, R. Haupt
We present a new design for a frequency configurable microstrip patch antenna. The tuning mechanism consists of placing shorting posts placed in pre-drilled holes between the patch and ground plane at set locations on the patch. The hole locations are arranged so that the insertion of shorting pins in certain holes result in a predetermined resonant frequency. A frequency tunable microstrip patch operating over an 870 MHz bandwidth at the 5 GHz wireless local area network (WLAN) band is presented.
{"title":"A Mechanically Configurable Microstrip Patch Antenna for IEEE 802.11 WLAN Band","authors":"P. Nayeri, R. Haupt","doi":"10.23919/USNC-URSI-NRSM.2019.8713027","DOIUrl":"https://doi.org/10.23919/USNC-URSI-NRSM.2019.8713027","url":null,"abstract":"We present a new design for a frequency configurable microstrip patch antenna. The tuning mechanism consists of placing shorting posts placed in pre-drilled holes between the patch and ground plane at set locations on the patch. The hole locations are arranged so that the insertion of shorting pins in certain holes result in a predetermined resonant frequency. A frequency tunable microstrip patch operating over an 870 MHz bandwidth at the 5 GHz wireless local area network (WLAN) band is presented.","PeriodicalId":142320,"journal":{"name":"2019 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123132844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.23919/USNC-URSI-NRSM.2019.8712996
O. Manoochehri, D. Erricolo, Amin Darvazehban, F. Monticone
A wideband and miniaturized reconfigurable antenna operating from 3.5 GHz to 5.5 GHz is proposed. This antenna has a simple structure and uses one tapered crossshaped radiation slot with four parasitic slots and eight PIN diodes. Four diodes are used to control four reflector slots to steer the radiation pattern and the other diodes are used to switch the feeding path to modify the polarization of the radiated beam. The metasurface acts as a reflector and reduces the back lobe, while keeping the profile of the antenna small. Simulation results are presented. The main lobe has minimum gain of 7 dBi and can be steered along 5 positions 0°, ±17° in two perpendicular elevation planes.
{"title":"Design of Compact Beam-Steering Active Slot Antennas with a Metasurface Reflector","authors":"O. Manoochehri, D. Erricolo, Amin Darvazehban, F. Monticone","doi":"10.23919/USNC-URSI-NRSM.2019.8712996","DOIUrl":"https://doi.org/10.23919/USNC-URSI-NRSM.2019.8712996","url":null,"abstract":"A wideband and miniaturized reconfigurable antenna operating from 3.5 GHz to 5.5 GHz is proposed. This antenna has a simple structure and uses one tapered crossshaped radiation slot with four parasitic slots and eight PIN diodes. Four diodes are used to control four reflector slots to steer the radiation pattern and the other diodes are used to switch the feeding path to modify the polarization of the radiated beam. The metasurface acts as a reflector and reduces the back lobe, while keeping the profile of the antenna small. Simulation results are presented. The main lobe has minimum gain of 7 dBi and can be steered along 5 positions 0°, ±17° in two perpendicular elevation planes.","PeriodicalId":142320,"journal":{"name":"2019 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132901535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.23919/USNC-URSI-NRSM.2019.8712872
Taeho Oh, Omiya Hassan, S. Shamsir, S. Islam
Electromagnetic based energy harvesting systems are being widely researched with radio frequency (RF) as their energy source. RF energy is preferred due to its availability and characteristics of transferring energy remotely and in all directions. This paper presents a newly design low-power CMOS full-bridge rectifier which works as the receiver of the harvesting system. The proposed rectifier scheme includes two NMOS and two PMOS devices and they are realized in a standard 130nm CMOS process. The work is focused on RF signals of around 900 MHz. To achieve stable energy transmission between the antenna and the proposed AC-DC rectifier, an impedance matching network is designed with values of capacitor and inductor of 550fF and 45nH, respectively. A DC-DC converter with a Maximum Power Point Tracking (MPPT) system is designed for storing energy from the RF signal with minimum current consumption. The peak efficiency of this design is about 5% at 10 dBm. The overall system is very light-weight and requires no external wiring and connection.
{"title":"Low-Power RF Energy Harvester Circuit Design for Wearable Medical Applications","authors":"Taeho Oh, Omiya Hassan, S. Shamsir, S. Islam","doi":"10.23919/USNC-URSI-NRSM.2019.8712872","DOIUrl":"https://doi.org/10.23919/USNC-URSI-NRSM.2019.8712872","url":null,"abstract":"Electromagnetic based energy harvesting systems are being widely researched with radio frequency (RF) as their energy source. RF energy is preferred due to its availability and characteristics of transferring energy remotely and in all directions. This paper presents a newly design low-power CMOS full-bridge rectifier which works as the receiver of the harvesting system. The proposed rectifier scheme includes two NMOS and two PMOS devices and they are realized in a standard 130nm CMOS process. The work is focused on RF signals of around 900 MHz. To achieve stable energy transmission between the antenna and the proposed AC-DC rectifier, an impedance matching network is designed with values of capacitor and inductor of 550fF and 45nH, respectively. A DC-DC converter with a Maximum Power Point Tracking (MPPT) system is designed for storing energy from the RF signal with minimum current consumption. The peak efficiency of this design is about 5% at 10 dBm. The overall system is very light-weight and requires no external wiring and connection.","PeriodicalId":142320,"journal":{"name":"2019 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132933558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.23919/USNC-URSI-NRSM.2019.8712973
R. McCargar, Mark Strother
The parabolic wave equation (PWE) has been used extensively to model propagation in electrically large domains dominated by forward scatter. A PWE method for modeling propagation through an inhomogeneous body-of-revolution (BOR) was recently described, wherein a three-dimensional result was synthesized from a summation of independent solutions obtained with two-dimensional solvers. Far-field solutions were obtained by applying scalar diffraction theory on the axial boundary-using a cylindrical coordinate system-which required a numerical domain with a large radial extent. This paper presents an efficient method for extrapolating the field on the radial boundary into the far field, allowing for a numerical domain with a smaller radial extent, thereby increasing computational efficiency.
{"title":"Far-field Extrapolation of the Body-of-Revolution Parabolic Wave Equation","authors":"R. McCargar, Mark Strother","doi":"10.23919/USNC-URSI-NRSM.2019.8712973","DOIUrl":"https://doi.org/10.23919/USNC-URSI-NRSM.2019.8712973","url":null,"abstract":"The parabolic wave equation (PWE) has been used extensively to model propagation in electrically large domains dominated by forward scatter. A PWE method for modeling propagation through an inhomogeneous body-of-revolution (BOR) was recently described, wherein a three-dimensional result was synthesized from a summation of independent solutions obtained with two-dimensional solvers. Far-field solutions were obtained by applying scalar diffraction theory on the axial boundary-using a cylindrical coordinate system-which required a numerical domain with a large radial extent. This paper presents an efficient method for extrapolating the field on the radial boundary into the far field, allowing for a numerical domain with a smaller radial extent, thereby increasing computational efficiency.","PeriodicalId":142320,"journal":{"name":"2019 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129580092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.23919/USNC-URSI-NRSM.2019.8712871
A. Dutta, V. Chandrasekar
The presence of sea clutter introduces error in weather radar observations over sea. Since the characteristics of sea clutter are different from stationary ground clutter, conventional clutter mitigation techniques produce unsatisfactory results. Hence, study of sea clutter properties and its mitigation is important. Over the last few decades, various research communities have studied and modelled sea clutter using different statistical distributions. This paper discusses identification of sea clutter in a weather radar using fuzzy logic technique. Time series data from an C-band dual-pol weather radar has been used to identify sea clutter in presence of precipitation. Spectral properties and distributions of sea clutter are also studied and a modified GMAP technique has been implemented for the sea clutter suppression.
{"title":"Detection, Analysis and Mitigation of Sea Clutter in Polarimetric Weather Radar","authors":"A. Dutta, V. Chandrasekar","doi":"10.23919/USNC-URSI-NRSM.2019.8712871","DOIUrl":"https://doi.org/10.23919/USNC-URSI-NRSM.2019.8712871","url":null,"abstract":"The presence of sea clutter introduces error in weather radar observations over sea. Since the characteristics of sea clutter are different from stationary ground clutter, conventional clutter mitigation techniques produce unsatisfactory results. Hence, study of sea clutter properties and its mitigation is important. Over the last few decades, various research communities have studied and modelled sea clutter using different statistical distributions. This paper discusses identification of sea clutter in a weather radar using fuzzy logic technique. Time series data from an C-band dual-pol weather radar has been used to identify sea clutter in presence of precipitation. Spectral properties and distributions of sea clutter are also studied and a modified GMAP technique has been implemented for the sea clutter suppression.","PeriodicalId":142320,"journal":{"name":"2019 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128313265","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.23919/USNC-URSI-NRSM.2019.8712870
Nicholas E. Russo, C. Zekios, S. Georgakopoulos
In this work, a capacity reconfigurable Multiple-Input-Multiple-Output (MIMO) antenna is proposed. The goal is to allow the capacity of a MIMO communication channel to be adjusted in real time to varying data rate, gain, and space requirements. As a proof-of-concept, an eight element MIMO antenna is created using microstrip dipoles operating at 2.4 GHz. To reduce mutual coupling, the elements have their centers co-aligned and are orthogonally oriented with respect to one another. The antenna is implemented on a 3D printed modified scissor lift mechanism. This robust mechanism allows the channel capacity to be varied as a function of inter-element spacing. Based on the preliminary results using the proposed origami topology, the capacity can vary up to 50% while the gain can vary up to 10% by changing the inter-element spacing.
{"title":"Capacity Reconfigurable Origami Enabled MIMO Antenna","authors":"Nicholas E. Russo, C. Zekios, S. Georgakopoulos","doi":"10.23919/USNC-URSI-NRSM.2019.8712870","DOIUrl":"https://doi.org/10.23919/USNC-URSI-NRSM.2019.8712870","url":null,"abstract":"In this work, a capacity reconfigurable Multiple-Input-Multiple-Output (MIMO) antenna is proposed. The goal is to allow the capacity of a MIMO communication channel to be adjusted in real time to varying data rate, gain, and space requirements. As a proof-of-concept, an eight element MIMO antenna is created using microstrip dipoles operating at 2.4 GHz. To reduce mutual coupling, the elements have their centers co-aligned and are orthogonally oriented with respect to one another. The antenna is implemented on a 3D printed modified scissor lift mechanism. This robust mechanism allows the channel capacity to be varied as a function of inter-element spacing. Based on the preliminary results using the proposed origami topology, the capacity can vary up to 50% while the gain can vary up to 10% by changing the inter-element spacing.","PeriodicalId":142320,"journal":{"name":"2019 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126683024","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.23919/USNC-URSI-NRSM.2019.8713015
M. Sinclair, D. Biswas, T. Le, J. Hyde, I. Mahbub, L. Chang, Y. Hao
For biomedical applications, implantable devices require an external or internal power source to operate. The restricting wires and battery limitations emphasize the need for wireless power transfer (WPT) system for the implants. In this paper, a flexible receiver module is presented for WPT applications using Polyethylene Naphthalate (PEN). The WPT system achieve a maximum power transfer efficiency (PTE) of 0.15% at 5 mm distance through air at 4 MHz operating frequency. The specific absorption rate (SAR) for the proposed WPT system is evaluated through a 6-layer tissue model.
{"title":"Design of a Flexible Receiver Module for Implantable Wireless Power Transfer (WPT) Applications","authors":"M. Sinclair, D. Biswas, T. Le, J. Hyde, I. Mahbub, L. Chang, Y. Hao","doi":"10.23919/USNC-URSI-NRSM.2019.8713015","DOIUrl":"https://doi.org/10.23919/USNC-URSI-NRSM.2019.8713015","url":null,"abstract":"For biomedical applications, implantable devices require an external or internal power source to operate. The restricting wires and battery limitations emphasize the need for wireless power transfer (WPT) system for the implants. In this paper, a flexible receiver module is presented for WPT applications using Polyethylene Naphthalate (PEN). The WPT system achieve a maximum power transfer efficiency (PTE) of 0.15% at 5 mm distance through air at 4 MHz operating frequency. The specific absorption rate (SAR) for the proposed WPT system is evaluated through a 6-layer tissue model.","PeriodicalId":142320,"journal":{"name":"2019 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM)","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128896997","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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