Pub Date : 2018-10-01DOI: 10.23919/radio.2018.8572330
Faraaz Shamutally, Ziyaad Soreefan, Arjoon Suddhoo, Jean Marc Momplé
This short paper describes a practical approach to build a low cost “home brew” Low Earth Orbit (LEO) satellite ground station for receiving telemetry as well as pictures from weather satellites and CubeSats. The setup will enable students and radio enthusiasts to get acquainted with LEO satellites and space technology, telemetry decoding and also receive directly METEO pictures at low cost. The proposed antennas have been built locally (see photos below) and the proposed setup fully tested in January 2018 and presented in various Radio Amateurs workshops.
{"title":"Practical “Low Cost” LEO Receiving Ground Station","authors":"Faraaz Shamutally, Ziyaad Soreefan, Arjoon Suddhoo, Jean Marc Momplé","doi":"10.23919/radio.2018.8572330","DOIUrl":"https://doi.org/10.23919/radio.2018.8572330","url":null,"abstract":"This short paper describes a practical approach to build a low cost “home brew” Low Earth Orbit (LEO) satellite ground station for receiving telemetry as well as pictures from weather satellites and CubeSats. The setup will enable students and radio enthusiasts to get acquainted with LEO satellites and space technology, telemetry decoding and also receive directly METEO pictures at low cost. The proposed antennas have been built locally (see photos below) and the proposed setup fully tested in January 2018 and presented in various Radio Amateurs workshops.","PeriodicalId":365518,"journal":{"name":"2018 IEEE Radio and Antenna Days of the Indian Ocean (RADIO)","volume":"18 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":"131405161","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.2018.8572406
R. Nandi, P. Venkateswaran, S. Pattanayak, K. Mathur
A linear voltage controlled quadrature oscillator (LVCQO) is presented; the design uses commercially available IC modules. The response had been experimentally verified with simulation and hardware test. The realization is based on an electronically tunable allpass filter (ETAF) coupled with a voltage controlled integrator (VCI). Quadrature oscillator tuning frequecy is measured in a range of $mathbf{1}leq pmb{f}_{o} < (mathbf{MHz})leq mathbf{10}$ with satisfactory phase-noise response of −96 dBc/Hz. Effects of device parasitic are negligible.
{"title":"A Linear Voltage Controlled Quadrature Oscillator","authors":"R. Nandi, P. Venkateswaran, S. Pattanayak, K. Mathur","doi":"10.23919/RADIO.2018.8572406","DOIUrl":"https://doi.org/10.23919/RADIO.2018.8572406","url":null,"abstract":"A linear voltage controlled quadrature oscillator (LVCQO) is presented; the design uses commercially available IC modules. The response had been experimentally verified with simulation and hardware test. The realization is based on an electronically tunable allpass filter (ETAF) coupled with a voltage controlled integrator (VCI). Quadrature oscillator tuning frequecy is measured in a range of $mathbf{1}leq pmb{f}_{o} < (mathbf{MHz})leq mathbf{10}$ with satisfactory phase-noise response of −96 dBc/Hz. Effects of device parasitic are negligible.","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":"134480412","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.2018.8572477
Dewald Sieberhagen, H. Nel, T. Stander
We investigate the use of an SIW cavity on-chip with varactor tuning as a resonant tank for a cross-coupled VCO in 130nm SiGe BiCMOS. Unloaded Q-factors of 31.7 to 214 over the tuning range are obtained. The VCO's frequency tuning range is simulated to be 81.4 – 82.2 GHz, with an average phase noise of −79 dBc/Hz at 1 MHz offset. It is found that the long feed lines to the cavity negate the possible improvement in phase noise gained from the high $mathbf{Q}_{0}$ cavity.
{"title":"A Cross-Coupled E-Band VCO with on-chip SIW Resonator in 130nm SiGe BiCMOS","authors":"Dewald Sieberhagen, H. Nel, T. Stander","doi":"10.23919/RADIO.2018.8572477","DOIUrl":"https://doi.org/10.23919/RADIO.2018.8572477","url":null,"abstract":"We investigate the use of an SIW cavity on-chip with varactor tuning as a resonant tank for a cross-coupled VCO in 130nm SiGe BiCMOS. Unloaded Q-factors of 31.7 to 214 over the tuning range are obtained. The VCO's frequency tuning range is simulated to be 81.4 – 82.2 GHz, with an average phase noise of −79 dBc/Hz at 1 MHz offset. It is found that the long feed lines to the cavity negate the possible improvement in phase noise gained from the high $mathbf{Q}_{0}$ cavity.","PeriodicalId":365518,"journal":{"name":"2018 IEEE Radio and Antenna Days of the Indian Ocean (RADIO)","volume":"73 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":"124154146","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.2018.8572344
D. Serebriakov, R. Abdullin
This paper is devoted to the investigation of an evaporation duct in the context of its impact on microwave links communication stability. The work contains the numerical results for previously developed mathematical model based on using the method of dyadic Green's functions. The electric field intensity dependencies on the receiving antenna suspension height and height of evaporation duct have been obtained. These results make it possible to formulate recommendations on how to place the transceiver antennas of microwave links to ensure 24-hour radio communication stability.
{"title":"Optimal Antenna Position Inside Evaporation Duct","authors":"D. Serebriakov, R. Abdullin","doi":"10.23919/RADIO.2018.8572344","DOIUrl":"https://doi.org/10.23919/RADIO.2018.8572344","url":null,"abstract":"This paper is devoted to the investigation of an evaporation duct in the context of its impact on microwave links communication stability. The work contains the numerical results for previously developed mathematical model based on using the method of dyadic Green's functions. The electric field intensity dependencies on the receiving antenna suspension height and height of evaporation duct have been obtained. These results make it possible to formulate recommendations on how to place the transceiver antennas of microwave links to ensure 24-hour radio communication stability.","PeriodicalId":365518,"journal":{"name":"2018 IEEE Radio and Antenna Days of the Indian Ocean (RADIO)","volume":"7 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":"126817182","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.2018.8572459
Sara K. Vesely, S. Dolci, C. Dolci
There is much interest in functional magnetic resonance (fMRI) localization of cognitive processes. Their dependency on hemodynamics is among the issues concerning the experimental protocol and data analysis. Thus, assessment of flow effects on the images obtained by commercial instruments is useful. We show by some examples on water carrying vessels that their orientation under continuous flow conditions may be wrongly reconstructed in spin-echo images.
{"title":"MRI of Flow and the Lagrangian Description","authors":"Sara K. Vesely, S. Dolci, C. Dolci","doi":"10.23919/RADIO.2018.8572459","DOIUrl":"https://doi.org/10.23919/RADIO.2018.8572459","url":null,"abstract":"There is much interest in functional magnetic resonance (fMRI) localization of cognitive processes. Their dependency on hemodynamics is among the issues concerning the experimental protocol and data analysis. Thus, assessment of flow effects on the images obtained by commercial instruments is useful. We show by some examples on water carrying vessels that their orientation under continuous flow conditions may be wrongly reconstructed in spin-echo images.","PeriodicalId":365518,"journal":{"name":"2018 IEEE Radio and Antenna Days of the Indian Ocean (RADIO)","volume":"10 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":"128436168","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.2018.8572484
{"title":"[Copyright notice]","authors":"","doi":"10.23919/radio.2018.8572484","DOIUrl":"https://doi.org/10.23919/radio.2018.8572484","url":null,"abstract":"","PeriodicalId":365518,"journal":{"name":"2018 IEEE Radio and Antenna Days of the Indian Ocean (RADIO)","volume":"29 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":"133950489","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.2018.8572423
A. Slobozhanyuk
Metasurfaces have become a new paradigm in the studies of artificial subwavelength structures due to their potential to overcome many challenges typically associated with metamaterials. In this contribution, recent advances in the field of microwave metasurfaces are described with the focus on novel fundamental ideas of two-dimensional topologically protected structures as well as on applications in the field of medical imaging.
{"title":"Metasurfaces: From Fundamental Ideas of Topological Photonics to Applications in Magnetic Resonance Imaging","authors":"A. Slobozhanyuk","doi":"10.23919/RADIO.2018.8572423","DOIUrl":"https://doi.org/10.23919/RADIO.2018.8572423","url":null,"abstract":"Metasurfaces have become a new paradigm in the studies of artificial subwavelength structures due to their potential to overcome many challenges typically associated with metamaterials. In this contribution, recent advances in the field of microwave metasurfaces are described with the focus on novel fundamental ideas of two-dimensional topologically protected structures as well as on applications in the field of medical imaging.","PeriodicalId":365518,"journal":{"name":"2018 IEEE Radio and Antenna Days of the Indian Ocean (RADIO)","volume":"09 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":"122690409","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.2018.8572425
S. Patro, A. Panda, R. K. Mishra
This paper presents the Direct Current (DC) power budget analysis and Radio Frequency (RF) frontend system design considerations of a medium Power Amplifier (PA) with average power output of 1watt. The PA system analysis is performed in a simulation environment for three linearization usage scenarios such as, Back-off, Digital Pre-Distortion (DPD) and Analog Pre-Distortion (APD) schemes. In the Back-off mode, the total RF frontend power consumption is 35.87 watt and with the usage of DPD topology the power consumption is 32.76 watt while with APD topology, the power consumption is 23.74 watt. The APD topology considers a Commercial off the Shelf (COTS) design topology with using moderately non-linear PA device operation. As compared to the back-off operation, the DPD scheme has got a 8.6% estimated relative power saving and the APD provides an estimated relative power saving of 33.8%.
{"title":"On the DC Power Budget and RF Performance Study of a Linearized 1 Watt Medium RF Power Amplifier for Enterprise Wireless BS Applications","authors":"S. Patro, A. Panda, R. K. Mishra","doi":"10.23919/RADIO.2018.8572425","DOIUrl":"https://doi.org/10.23919/RADIO.2018.8572425","url":null,"abstract":"This paper presents the Direct Current (DC) power budget analysis and Radio Frequency (RF) frontend system design considerations of a medium Power Amplifier (PA) with average power output of 1watt. The PA system analysis is performed in a simulation environment for three linearization usage scenarios such as, Back-off, Digital Pre-Distortion (DPD) and Analog Pre-Distortion (APD) schemes. In the Back-off mode, the total RF frontend power consumption is 35.87 watt and with the usage of DPD topology the power consumption is 32.76 watt while with APD topology, the power consumption is 23.74 watt. The APD topology considers a Commercial off the Shelf (COTS) design topology with using moderately non-linear PA device operation. As compared to the back-off operation, the DPD scheme has got a 8.6% estimated relative power saving and the APD provides an estimated relative power saving of 33.8%.","PeriodicalId":365518,"journal":{"name":"2018 IEEE Radio and Antenna Days of the Indian Ocean (RADIO)","volume":"35 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":"116215209","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.2018.8572391
E. W. Coetzee, J. Odendaal, J. Joubert
We present the design of a dual-band slot antenna with high gain for wireless local area network (WLAN) covering the IEEE802.11a/b and IEEE802.116d/e standards. The antenna consists of a feed line with a complementary strip-slot pair and a parasitic slot-element and has a size of $57times 40 mm^{2}$. The antenna is combined with a single-band artificial magnetic conductor (AMC) surface to achieve a unidirectional radiation pattern with an average gain of 9.6 dBi. The size of the antenna with the AMC reflector is $68times 53 mm^{2}$. The proposed antenna was designed and simulated. The simulation results show that the antenna operates from 2.39 – 2.50 GHz and 4.90 – 5.97 GHz, which covers the 2.4, 5.2 and 5.8 GHz WLAN bands. It has a directional radiation pattern with peak gains of 7.5, 10.3 and 10.9 dBi at 2.4, 5.2 and 5.8 GHz, respectively.
{"title":"A Dual-Band Antenna with AMC Reflector for WLAN Applications","authors":"E. W. Coetzee, J. Odendaal, J. Joubert","doi":"10.23919/RADIO.2018.8572391","DOIUrl":"https://doi.org/10.23919/RADIO.2018.8572391","url":null,"abstract":"We present the design of a dual-band slot antenna with high gain for wireless local area network (WLAN) covering the IEEE802.11a/b and IEEE802.116d/e standards. The antenna consists of a feed line with a complementary strip-slot pair and a parasitic slot-element and has a size of $57times 40 mm^{2}$. The antenna is combined with a single-band artificial magnetic conductor (AMC) surface to achieve a unidirectional radiation pattern with an average gain of 9.6 dBi. The size of the antenna with the AMC reflector is $68times 53 mm^{2}$. The proposed antenna was designed and simulated. The simulation results show that the antenna operates from 2.39 – 2.50 GHz and 4.90 – 5.97 GHz, which covers the 2.4, 5.2 and 5.8 GHz WLAN bands. It has a directional radiation pattern with peak gains of 7.5, 10.3 and 10.9 dBi at 2.4, 5.2 and 5.8 GHz, respectively.","PeriodicalId":365518,"journal":{"name":"2018 IEEE Radio and Antenna Days of the Indian Ocean (RADIO)","volume":"17 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":"121248731","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.2018.8572347
H. Pretl, Silvester Sadjina
The upgrade from 3GPP Long Term Evolution (LTE) towards LTE-Advanced introduced Carrier-Aggregation (CA), necessitating multiple receivers (RX) and transmitters (TX) operating concurrently on a single transceiver die, causing potential interference among them. The introduction of 5G New Radio (5G NR) will require Dual Connectivity (DC) with LTE in the first phase and thus also require a multitude of parallel-operating high-performance receive and transmit chains in a multi-mode LTE-A/5G NR transceiver, driving the need for analog and digital techniques for self-interference mitigation due to coupling between different parts of the transceiver. This paper catalogs the various cross-talk effects and presents digital as well as mixed-signal interference mitigation techniques in condensed form.
从3GPP长期演进(LTE)到LTE- advanced的升级引入了载波聚合(CA)，这需要多个接收器(RX)和发射器(TX)在单个收发器芯片上同时工作，从而导致它们之间的潜在干扰。5G新无线电(5G NR)的引入将需要在第一阶段使用LTE的双连接(DC)，因此还需要在多模LTE- a /5G NR收发器中使用大量并行操作的高性能接收和发送链，从而推动了对模拟和数字技术的需求，以减轻由于收发器不同部分之间耦合而产生的自干扰。本文对各种串扰效应进行了分类，并以简明的形式介绍了数字和混合信号干扰缓解技术。
{"title":"Self-Interference in LTE-Advanced and 5G NR Transceivers","authors":"H. Pretl, Silvester Sadjina","doi":"10.23919/RADIO.2018.8572347","DOIUrl":"https://doi.org/10.23919/RADIO.2018.8572347","url":null,"abstract":"The upgrade from 3GPP Long Term Evolution (LTE) towards LTE-Advanced introduced Carrier-Aggregation (CA), necessitating multiple receivers (RX) and transmitters (TX) operating concurrently on a single transceiver die, causing potential interference among them. The introduction of 5G New Radio (5G NR) will require Dual Connectivity (DC) with LTE in the first phase and thus also require a multitude of parallel-operating high-performance receive and transmit chains in a multi-mode LTE-A/5G NR transceiver, driving the need for analog and digital techniques for self-interference mitigation due to coupling between different parts of the transceiver. This paper catalogs the various cross-talk effects and presents digital as well as mixed-signal interference mitigation techniques in condensed form.","PeriodicalId":365518,"journal":{"name":"2018 IEEE Radio and Antenna Days of the Indian Ocean (RADIO)","volume":"35 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":"131990702","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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