Pub Date : 2018-10-01DOI: 10.23919/RADIO.2018.8572390
A. Alonge, T. Afullo
The arrival of rain cells during rain events is an important factor applied in the deployment of site diversity for mitigating rainfall attenuation in communication systems. In this study, the queue arrival characteristics of rain cells over radio links are explored from ground measurements in Durban (29°52'S, 30°58'E) in South Africa and Butare (2°36'S, 29°44'E) in Rwanda. The results suggest that cumulative arrivals of rain cell queues influence the event duration and equivalent rain cell distance, during typical rain events.
{"title":"Queue Arrival Characteristics of Catenated Rainfall Cells Over Wireless Radio Links","authors":"A. Alonge, T. Afullo","doi":"10.23919/RADIO.2018.8572390","DOIUrl":"https://doi.org/10.23919/RADIO.2018.8572390","url":null,"abstract":"The arrival of rain cells during rain events is an important factor applied in the deployment of site diversity for mitigating rainfall attenuation in communication systems. In this study, the queue arrival characteristics of rain cells over radio links are explored from ground measurements in Durban (29°52'S, 30°58'E) in South Africa and Butare (2°36'S, 29°44'E) in Rwanda. The results suggest that cumulative arrivals of rain cell queues influence the event duration and equivalent rain cell distance, during typical rain events.","PeriodicalId":365518,"journal":{"name":"2018 IEEE Radio and Antenna Days of the Indian Ocean (RADIO)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128444180","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 : 2018-10-01DOI: 10.23919/RADIO.2018.8572386
D. Letavin
In this paper, a compact design of a five-stub microstrip coupler with significantly reduced overall dimensions has been investigated. To reduce the size, an artificial transmission line was used, with equivalent characteristics at a central operating frequency of 1000 MHz and in its vicinity, with the characteristics of an even-wave-length segment. Using the program of electrodynamic modeling AWR DE, a standard and compact coupler design was simulated. Due to the fact that the artificial line is shorter and the protruding elements are located, so that to maximally use the free space of the coupler without crossing with neighboring conductive lines from other lines, it was possible to reduce the area of the traditional coupler by 70% in relation to the area of the standard design, while the reduction in the band of operating frequencies occurred by 10%.
{"title":"Five-Stub Directional Device with Substantially Reduced Overall Dimensions","authors":"D. Letavin","doi":"10.23919/RADIO.2018.8572386","DOIUrl":"https://doi.org/10.23919/RADIO.2018.8572386","url":null,"abstract":"In this paper, a compact design of a five-stub microstrip coupler with significantly reduced overall dimensions has been investigated. To reduce the size, an artificial transmission line was used, with equivalent characteristics at a central operating frequency of 1000 MHz and in its vicinity, with the characteristics of an even-wave-length segment. Using the program of electrodynamic modeling AWR DE, a standard and compact coupler design was simulated. Due to the fact that the artificial line is shorter and the protruding elements are located, so that to maximally use the free space of the coupler without crossing with neighboring conductive lines from other lines, it was possible to reduce the area of the traditional coupler by 70% in relation to the area of the standard design, while the reduction in the band of operating frequencies occurred by 10%.","PeriodicalId":365518,"journal":{"name":"2018 IEEE Radio and Antenna Days of the Indian Ocean (RADIO)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129060822","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 : 2018-10-01DOI: 10.23919/RADIO.2018.8572463
Y. Erhel, J. Masson, D. Lemur, F. Marie, M. Oger
Power differences of arrival (PDOA) methods achieve transmitter localization with a simple signal processing and a low computational burden. After a summary presentation of hyperbolic methods, this paper presents simulation results valid in the UHF band and estimating the positioning accuracy expected when resorting to the weighted least mean squares algorithm. In a second step, a reduced scale experimentation is carried out on an open rural terrain and the accuracy in the transmitter localization appears consistent with predictions.
{"title":"Application of Hyperbolic Methods Based on PDOA for Transmitter Localization in the UHF Band","authors":"Y. Erhel, J. Masson, D. Lemur, F. Marie, M. Oger","doi":"10.23919/RADIO.2018.8572463","DOIUrl":"https://doi.org/10.23919/RADIO.2018.8572463","url":null,"abstract":"Power differences of arrival (PDOA) methods achieve transmitter localization with a simple signal processing and a low computational burden. After a summary presentation of hyperbolic methods, this paper presents simulation results valid in the UHF band and estimating the positioning accuracy expected when resorting to the weighted least mean squares algorithm. In a second step, a reduced scale experimentation is carried out on an open rural terrain and the accuracy in the transmitter localization appears consistent with predictions.","PeriodicalId":365518,"journal":{"name":"2018 IEEE Radio and Antenna Days of the Indian Ocean (RADIO)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121140780","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 : 2018-10-01DOI: 10.23919/RADIO.2018.8572485
A. Monorchio, A. Corucci, P. Usai
A proper use of electromagnetic numerical simulations can lead to an efficient equipment integration and consequent successful deployment of complex systems and stations. In this paper, the level of accuracy attainable with modern numerical methods is discussed as a consequence of measurement campaign performed in complex systems and environments.
{"title":"Validation of Electromagnetic Numerical Simulations Through Measurements for Successful Deployment of Complex Systems","authors":"A. Monorchio, A. Corucci, P. Usai","doi":"10.23919/RADIO.2018.8572485","DOIUrl":"https://doi.org/10.23919/RADIO.2018.8572485","url":null,"abstract":"A proper use of electromagnetic numerical simulations can lead to an efficient equipment integration and consequent successful deployment of complex systems and stations. In this paper, the level of accuracy attainable with modern numerical methods is discussed as a consequence of measurement campaign performed in complex systems and environments.","PeriodicalId":365518,"journal":{"name":"2018 IEEE Radio and Antenna Days of the Indian Ocean (RADIO)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126467068","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 : 2018-10-01DOI: 10.23919/RADIO.2018.8572382
F. Nsengiyumva, C. Migliaccio, L. Brochier, J. Dauvignac, I. Aliferis, C. Pichot
We present an innovative system dedicated to millimeter wave scattering measurements in W-band. The principal innovations are the high-precision swivel arm, use of a semi-anechoic environment, flexibility for positioning the object under study, and post-processing to correct measurement errors. Different test objects are used for evaluating the performance of the system for VV- and HH-polarizations.
{"title":"Innovative Scattering Measurement System in W-Band","authors":"F. Nsengiyumva, C. Migliaccio, L. Brochier, J. Dauvignac, I. Aliferis, C. Pichot","doi":"10.23919/RADIO.2018.8572382","DOIUrl":"https://doi.org/10.23919/RADIO.2018.8572382","url":null,"abstract":"We present an innovative system dedicated to millimeter wave scattering measurements in W-band. The principal innovations are the high-precision swivel arm, use of a semi-anechoic environment, flexibility for positioning the object under study, and post-processing to correct measurement errors. Different test objects are used for evaluating the performance of the system for VV- and HH-polarizations.","PeriodicalId":365518,"journal":{"name":"2018 IEEE Radio and Antenna Days of the Indian Ocean (RADIO)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130746225","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 : 2018-10-01DOI: 10.23919/RADIO.2018.8572437
G. Militaru, D. Popescu, L. Ichim
A global characterization of the propagation behavior that will allow a general approach of the RF prediction is difficult to achieve. In this paper, based on field strength values collected in typical rural environment, the authors are providing their findings after the calibration of a deterministic propagation model in UHF frequency band. An evaluation of the error sources, and methods to validate RF antenna pattern, are described. The proposed methodology was used to obtain the measurements that allow the correlation with prediction data.
{"title":"UHF Propagation Model Calibration Using Correlations between Field Measurements and Prediction","authors":"G. Militaru, D. Popescu, L. Ichim","doi":"10.23919/RADIO.2018.8572437","DOIUrl":"https://doi.org/10.23919/RADIO.2018.8572437","url":null,"abstract":"A global characterization of the propagation behavior that will allow a general approach of the RF prediction is difficult to achieve. In this paper, based on field strength values collected in typical rural environment, the authors are providing their findings after the calibration of a deterministic propagation model in UHF frequency band. An evaluation of the error sources, and methods to validate RF antenna pattern, are described. The proposed methodology was used to obtain the measurements that allow the correlation with prediction data.","PeriodicalId":365518,"journal":{"name":"2018 IEEE Radio and Antenna Days of the Indian Ocean (RADIO)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128906218","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 : 2018-10-01DOI: 10.23919/RADIO.2018.8572374
Munish Kumar, V. Nath
In this paper, the effect of scaling, a 2-D nonlinear manipulation on antenna characteristics in the multilayered scenario is presented. Seven iterations are performed on the parasitic patch to obtain the wide impedance bandwidth. A nonlinear replication on the fractal patch is performed for circular polarization and much wider IBW. Simulation results show that two bands with reflection coefficient below −10dB are obtained having IBW of 88% from 4-8.44 GHz and 8.5% from 9.46-10.3 GHz. The 3-dB axial-ratio bandwidth for both bands is 38.6% from 4.84-6.77 GHz and 4.6% from 9.55-10 GHz respectively. The proposed structure exhibits the dual-band performance with a maximum gain of 10.3 dB. The proposed antenna structure is more compact compared to antennas earlier reported in the literature working in C and X band.
{"title":"Dual-Band Dual-Polarized Stacked Octagonal Fractal Patch Antenna with Nonlinear Manipulation","authors":"Munish Kumar, V. Nath","doi":"10.23919/RADIO.2018.8572374","DOIUrl":"https://doi.org/10.23919/RADIO.2018.8572374","url":null,"abstract":"In this paper, the effect of scaling, a 2-D nonlinear manipulation on antenna characteristics in the multilayered scenario is presented. Seven iterations are performed on the parasitic patch to obtain the wide impedance bandwidth. A nonlinear replication on the fractal patch is performed for circular polarization and much wider IBW. Simulation results show that two bands with reflection coefficient below −10dB are obtained having IBW of 88% from 4-8.44 GHz and 8.5% from 9.46-10.3 GHz. The 3-dB axial-ratio bandwidth for both bands is 38.6% from 4.84-6.77 GHz and 4.6% from 9.55-10 GHz respectively. The proposed structure exhibits the dual-band performance with a maximum gain of 10.3 dB. The proposed antenna structure is more compact compared to antennas earlier reported in the literature working in C and X band.","PeriodicalId":365518,"journal":{"name":"2018 IEEE Radio and Antenna Days of the Indian Ocean (RADIO)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125510692","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 : 2018-10-01DOI: 10.23919/RADIO.2018.8572360
Siti Nailah Mastura Zainarry, S. J. Chen, C. Fumeaux
A pattern-reconfigurable antenna based on a simple single-element microstrip antenna is presented. The antenna has a shorting wall near the patch center to introduce two slightly shifted resonances at its two radiating edges. A stub-loaded varactor is mounted at one of the patch radiating edges to obtain pattern reconfigurability, by electronically detuning the frequency of one of the resonances. Preliminary measurements of a prototype demonstrate that the antenna exhibits beam squint up to 39° on one side of the patch at the center frequency of 2.40 GHz, when the bias voltage is tuned from 18 to 3.8 V. Also for a fixed bias voltage of 6.3 V, the beam can scan from 8 ° to 43 ° as a function of frequency within the operation bandwidth from 2.35 to 2.45 GHz. The presented results validate the concept which will be further extended to scan beam on two sides with frequency selectivity.
{"title":"A Pattern-Reconfigurable Single-Element Microstrip Antenna","authors":"Siti Nailah Mastura Zainarry, S. J. Chen, C. Fumeaux","doi":"10.23919/RADIO.2018.8572360","DOIUrl":"https://doi.org/10.23919/RADIO.2018.8572360","url":null,"abstract":"A pattern-reconfigurable antenna based on a simple single-element microstrip antenna is presented. The antenna has a shorting wall near the patch center to introduce two slightly shifted resonances at its two radiating edges. A stub-loaded varactor is mounted at one of the patch radiating edges to obtain pattern reconfigurability, by electronically detuning the frequency of one of the resonances. Preliminary measurements of a prototype demonstrate that the antenna exhibits beam squint up to 39° on one side of the patch at the center frequency of 2.40 GHz, when the bias voltage is tuned from 18 to 3.8 V. Also for a fixed bias voltage of 6.3 V, the beam can scan from 8 ° to 43 ° as a function of frequency within the operation bandwidth from 2.35 to 2.45 GHz. The presented results validate the concept which will be further extended to scan beam on two sides with frequency selectivity.","PeriodicalId":365518,"journal":{"name":"2018 IEEE Radio and Antenna Days of the Indian Ocean (RADIO)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116667433","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 : 2018-10-01DOI: 10.23919/RADIO.2018.8572372
K. Jakobsen
A survey of hearing-instrument antennas used for body-centric wireless communications is presented. One challenge is to transmit a radio signal from a hearing instrument on one ear to a hearing instrument on the other ear to improve the hearing quality. Transmission through the head is not an option due to the losses at the ISM-band at 2.4 GHz. This is overcome by the use of surface waves, i.e., a wave that creeps on the top of the head. A major challenge is to construct antennas that effective launches surface waves for different types of hearing instruments.
{"title":"Body-Centric Wireless Communications: A Survey of Hearing-Instrument Antennas","authors":"K. Jakobsen","doi":"10.23919/RADIO.2018.8572372","DOIUrl":"https://doi.org/10.23919/RADIO.2018.8572372","url":null,"abstract":"A survey of hearing-instrument antennas used for body-centric wireless communications is presented. One challenge is to transmit a radio signal from a hearing instrument on one ear to a hearing instrument on the other ear to improve the hearing quality. Transmission through the head is not an option due to the losses at the ISM-band at 2.4 GHz. This is overcome by the use of surface waves, i.e., a wave that creeps on the top of the head. A major challenge is to construct antennas that effective launches surface waves for different types of hearing instruments.","PeriodicalId":365518,"journal":{"name":"2018 IEEE Radio and Antenna Days of the Indian Ocean (RADIO)","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122635935","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 : 2018-10-01DOI: 10.23919/RADIO.2018.8572348
D. Vizard, E. Hoare, M. Gashinova, M. Cherniakov
The Low THz spectrum has potential for high resolution imaging applications such as automotive radars and high data rate communications. Propagation studies and test platforms require compact portable equipment which may be achieved by extending the frequency range of commercial battery powered vector network analyzers (VNA). The development of both desktop and portable 110–670 GHz VNA based extenders is described along with some recent experimental test data using these instruments.
{"title":"Applications of Low THz Frequency Extenders for Vector Network Analyzers","authors":"D. Vizard, E. Hoare, M. Gashinova, M. Cherniakov","doi":"10.23919/RADIO.2018.8572348","DOIUrl":"https://doi.org/10.23919/RADIO.2018.8572348","url":null,"abstract":"The Low THz spectrum has potential for high resolution imaging applications such as automotive radars and high data rate communications. Propagation studies and test platforms require compact portable equipment which may be achieved by extending the frequency range of commercial battery powered vector network analyzers (VNA). The development of both desktop and portable 110–670 GHz VNA based extenders is described along with some recent experimental test data using these instruments.","PeriodicalId":365518,"journal":{"name":"2018 IEEE Radio and Antenna Days of the Indian Ocean (RADIO)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127004531","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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