Pub Date : 2021-09-13DOI: 10.1109/africon51333.2021.9570970
U. Hilleringmann, D. Petrov, Ibrahim Mwammenywa, Geoffrey Mark Kagarura
Photovoltaic microgrids in Sub-Saharan Africa (SSA) suffer from limited voltage stability and frequent blackouts caused by power generation/consumer load mismatch. To improve the reliability of the microgrids, a wireless sensor network for distributed load monitoring in combination with solar irradiation forecasts based on weather data are proposed. Implementing both, local load surveillance and weather prognosis, will considerably improve the overall network stability as this combination enables specific tailored countermeasures just in time. The proposed system further allows the implementation of a cost-effective time-based tariff management to support a better uniformity of the load during daytime.
{"title":"Local Power Control using Wireless Sensor System for Microgrids in Africa","authors":"U. Hilleringmann, D. Petrov, Ibrahim Mwammenywa, Geoffrey Mark Kagarura","doi":"10.1109/africon51333.2021.9570970","DOIUrl":"https://doi.org/10.1109/africon51333.2021.9570970","url":null,"abstract":"Photovoltaic microgrids in Sub-Saharan Africa (SSA) suffer from limited voltage stability and frequent blackouts caused by power generation/consumer load mismatch. To improve the reliability of the microgrids, a wireless sensor network for distributed load monitoring in combination with solar irradiation forecasts based on weather data are proposed. Implementing both, local load surveillance and weather prognosis, will considerably improve the overall network stability as this combination enables specific tailored countermeasures just in time. The proposed system further allows the implementation of a cost-effective time-based tariff management to support a better uniformity of the load during daytime.","PeriodicalId":170342,"journal":{"name":"2021 IEEE AFRICON","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126331551","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 : 2021-09-13DOI: 10.1109/africon51333.2021.9570966
Joseph Owusu, Oppong Nathaniel, Foeh Emmanuel, K. Diawuo
One problem of Ultra-wideband systems is reducing the size of the antenna while still maintaining the antenna’s performance in the Ultra-wideband frequency range. This is also a requirement in 5G wireless communication. 5G antennas are to have low profiles, simple structure, have a lighter weight, and a high gain. In this paper, a novel antenna with two steps on the patch and defected ground structure for UWB and 5G applications are presented. It has a volume of 32 x 32 x 1.6mm3. The antenna is realized on an FR4 substrate and fed with a 50Ω microstrip feedline. The design and simulation of the antenna were carried out using CST studio. The stepped patch is used to improve the impedance matching at the lower frequencies while the slotted ground is used to improve that of the higher frequencies. The antenna has high impedance matching characteristics over the entire operating bandwidth from 2.95 to 40 GHz at return loss ≤ 10 dB and Voltage Standing Wave Ratio < 2 from the simulated results with its highest gain at 9.5 GHz frequency. The antenna exhibits multiband characteristics at frequency ranges of 3.40-3.60, 8.63-10.37, 13.53-14.69, 18.82-20.06, 23.95- 24.56, 27.22-28.52 GHz frequency band at 20 dB. The antenna has good gain, and a low return loss of 20 dB at 28 GHz, making it suitable for 5G applications. The significance of the slots and Defected Ground Structure are also simulated and presented in this paper. The antenna can be used for UWB applications due to its wider bandwidth.
{"title":"Step-Like Ultra-Wideband Antenna Applicable for 5G Communication","authors":"Joseph Owusu, Oppong Nathaniel, Foeh Emmanuel, K. Diawuo","doi":"10.1109/africon51333.2021.9570966","DOIUrl":"https://doi.org/10.1109/africon51333.2021.9570966","url":null,"abstract":"One problem of Ultra-wideband systems is reducing the size of the antenna while still maintaining the antenna’s performance in the Ultra-wideband frequency range. This is also a requirement in 5G wireless communication. 5G antennas are to have low profiles, simple structure, have a lighter weight, and a high gain. In this paper, a novel antenna with two steps on the patch and defected ground structure for UWB and 5G applications are presented. It has a volume of 32 x 32 x 1.6mm3. The antenna is realized on an FR4 substrate and fed with a 50Ω microstrip feedline. The design and simulation of the antenna were carried out using CST studio. The stepped patch is used to improve the impedance matching at the lower frequencies while the slotted ground is used to improve that of the higher frequencies. The antenna has high impedance matching characteristics over the entire operating bandwidth from 2.95 to 40 GHz at return loss ≤ 10 dB and Voltage Standing Wave Ratio < 2 from the simulated results with its highest gain at 9.5 GHz frequency. The antenna exhibits multiband characteristics at frequency ranges of 3.40-3.60, 8.63-10.37, 13.53-14.69, 18.82-20.06, 23.95- 24.56, 27.22-28.52 GHz frequency band at 20 dB. The antenna has good gain, and a low return loss of 20 dB at 28 GHz, making it suitable for 5G applications. The significance of the slots and Defected Ground Structure are also simulated and presented in this paper. The antenna can be used for UWB applications due to its wider bandwidth.","PeriodicalId":170342,"journal":{"name":"2021 IEEE AFRICON","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130125625","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 : 2021-09-13DOI: 10.1109/africon51333.2021.9570923
W. Masamvu, O. Dzobo
Reactive power flow analysis is an essential feature of power systems management. Controlling the amounts of reactive power flowing in and out of a power system network aids in keeping network voltage within acceptable limits. As the penetration of renewable energy sources (RESs) into the conventional electric grid increases, its effect on reactive power must be investigated. Research studies have shown that the uncertainty of RESs in power generation influences the reactive power of a power system network and consequently its overall transmission losses. This influence can be mitigated by installing FACTS devices in the power system network. In this research paper, a case study is presented to determine the best location of Flexible Alternating Current Transmission System (FACTS) devices in a power system network with RESs. The uncertainty of load and wind power generation is modelled using probabilistic scenario-based method. The IEEE 14 bus test network is used in the analysis. The objective function is solved using the particle swarm optimization (PSO) algorithm. The results show that when FACTS devices are strategically positioned in a power system network and uncertainty is considered, they have a significant influence on the overall transmission loss of the network.
{"title":"Investigating the Optimal Location of FACTS Devices in Power System Networks with Renewable Energy Sources considering uncertainty","authors":"W. Masamvu, O. Dzobo","doi":"10.1109/africon51333.2021.9570923","DOIUrl":"https://doi.org/10.1109/africon51333.2021.9570923","url":null,"abstract":"Reactive power flow analysis is an essential feature of power systems management. Controlling the amounts of reactive power flowing in and out of a power system network aids in keeping network voltage within acceptable limits. As the penetration of renewable energy sources (RESs) into the conventional electric grid increases, its effect on reactive power must be investigated. Research studies have shown that the uncertainty of RESs in power generation influences the reactive power of a power system network and consequently its overall transmission losses. This influence can be mitigated by installing FACTS devices in the power system network. In this research paper, a case study is presented to determine the best location of Flexible Alternating Current Transmission System (FACTS) devices in a power system network with RESs. The uncertainty of load and wind power generation is modelled using probabilistic scenario-based method. The IEEE 14 bus test network is used in the analysis. The objective function is solved using the particle swarm optimization (PSO) algorithm. The results show that when FACTS devices are strategically positioned in a power system network and uncertainty is considered, they have a significant influence on the overall transmission loss of the network.","PeriodicalId":170342,"journal":{"name":"2021 IEEE AFRICON","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131139693","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 : 2021-09-13DOI: 10.1109/africon51333.2021.9570848
R. Lung
The possibility of enhancing the performance of the Probit classification model by adding a game theoretic flavour to the model parameters is explored in this paper. A game in which each attribute of the data set represents a player choosing its parameter is devised. The Nash equilibrium of this game is approximated by using a Differential Evolution algorithm. Numerical examples illustrate the potential of this approach.
{"title":"A Nash Equilibrium Approach based on Differential Evolution to Probit Classification","authors":"R. Lung","doi":"10.1109/africon51333.2021.9570848","DOIUrl":"https://doi.org/10.1109/africon51333.2021.9570848","url":null,"abstract":"The possibility of enhancing the performance of the Probit classification model by adding a game theoretic flavour to the model parameters is explored in this paper. A game in which each attribute of the data set represents a player choosing its parameter is devised. The Nash equilibrium of this game is approximated by using a Differential Evolution algorithm. Numerical examples illustrate the potential of this approach.","PeriodicalId":170342,"journal":{"name":"2021 IEEE AFRICON","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121842619","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 : 2021-09-13DOI: 10.1109/africon51333.2021.9570889
Ezra Misaki
True agricultural development heavily relies on the promptness and relevance of the information accessed by small-scale farmers. In this regard, the application of e- Agriculture has a huge potential and pathway for agricultural development. e-Agriculture facilitates the exchange of farming information, ideas, and resources that if practiced can improve productivity and livelihood. Information exchanged improves small-scale farmers' decision-making in the agricultural value chain and hence pathway in welfare development. Despite this potentiality of e-Agriculture, the literature on the assessment of the level of farmers’ awareness of the technology in Mkuranga is scanty. Therefore, using a quantitative survey design to 63 small-scale farmers, focusing on the dimensions attitude, impact, social-cultural inhibitions of using mobile technology and competence in using mobile technologies, this study found out that 81.0 and 87.3 per cent of the respondents were unaware of the existence of e-Agriculture and information and communication technology projects in the study area. Further, 76.2 per cent of small-scale farmers studied opined that such projects could enhance agriculture in future if well established. The study also found that information and communication technologies such as M-Pesa, Tigo-Pesa, and AirTel money services positively impacted the farming business. The study also found out that the social-cultural aspect was not inhibiting the scaling up of technology usage in the rural sector. Moreover, it was found that the competencies of farmers were low, indicating the low awareness of the technology. Thus, the study's findings provide insights on enhancing the use of e-Agriculture in the farming business and policy formulation in the agricultural sector.
{"title":"Small-Scale Farmers’ Awareness of e-Agriculture: A Pathway for Livelihood Development in Mkuranga, Tanzania","authors":"Ezra Misaki","doi":"10.1109/africon51333.2021.9570889","DOIUrl":"https://doi.org/10.1109/africon51333.2021.9570889","url":null,"abstract":"True agricultural development heavily relies on the promptness and relevance of the information accessed by small-scale farmers. In this regard, the application of e- Agriculture has a huge potential and pathway for agricultural development. e-Agriculture facilitates the exchange of farming information, ideas, and resources that if practiced can improve productivity and livelihood. Information exchanged improves small-scale farmers' decision-making in the agricultural value chain and hence pathway in welfare development. Despite this potentiality of e-Agriculture, the literature on the assessment of the level of farmers’ awareness of the technology in Mkuranga is scanty. Therefore, using a quantitative survey design to 63 small-scale farmers, focusing on the dimensions attitude, impact, social-cultural inhibitions of using mobile technology and competence in using mobile technologies, this study found out that 81.0 and 87.3 per cent of the respondents were unaware of the existence of e-Agriculture and information and communication technology projects in the study area. Further, 76.2 per cent of small-scale farmers studied opined that such projects could enhance agriculture in future if well established. The study also found that information and communication technologies such as M-Pesa, Tigo-Pesa, and AirTel money services positively impacted the farming business. The study also found out that the social-cultural aspect was not inhibiting the scaling up of technology usage in the rural sector. Moreover, it was found that the competencies of farmers were low, indicating the low awareness of the technology. Thus, the study's findings provide insights on enhancing the use of e-Agriculture in the farming business and policy formulation in the agricultural sector.","PeriodicalId":170342,"journal":{"name":"2021 IEEE AFRICON","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122527066","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 : 2021-09-13DOI: 10.1109/africon51333.2021.9570957
S. Adebola, Ken Goldberg
AlphaGarden is a polyculture garden tended by a robot using a learned control policy tuned with simulation, sensor and camera data. AlphaGarden aims to optimize yield and diversity while minimizing water use. This extended abstract considers how its seed planting algorithm could be used by African farmers.
{"title":"Assisting Polyculture Farming in Africa","authors":"S. Adebola, Ken Goldberg","doi":"10.1109/africon51333.2021.9570957","DOIUrl":"https://doi.org/10.1109/africon51333.2021.9570957","url":null,"abstract":"AlphaGarden is a polyculture garden tended by a robot using a learned control policy tuned with simulation, sensor and camera data. AlphaGarden aims to optimize yield and diversity while minimizing water use. This extended abstract considers how its seed planting algorithm could be used by African farmers.","PeriodicalId":170342,"journal":{"name":"2021 IEEE AFRICON","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121092510","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 : 2021-09-13DOI: 10.1109/africon51333.2021.9570964
E. C. Abunike, O. Okoro, I. Davidson
The design of a four-pole reluctance motor with multiple objectives is discussed in this paper using a finite element design methodology based on multi-objective genetic algorithm. Non-dominated genetic algorithm (NSGA-II) is used because of its high performance and intensification in optimization problems. The global sensitivity chart revealed that the motor’s stator pole embrace and yoke thickness are key parameters for the optimization objectives, while the rotor’s pole embrace should be restrained and closely associated with these two key parameters. According to the optimization and sensitivity analysis results, a final design which is superior to the base design was achieved. There were 15 % and 13.2 % improvement in the optimized model in terms of the average torque and efficiency respectively. Also, the optimized model recorded a reduction in the average torque ripple and total loss by 1.55 % and 30.1 % respectively. This demonstrates the NSGA-II intelligent optimization program is a suitable framework to optimize specified objective functions.
{"title":"Finite Element Design and Multi-objective Optimization of Four Pole Reluctance Motor Based on NSGA-II Intelligent Algorithm","authors":"E. C. Abunike, O. Okoro, I. Davidson","doi":"10.1109/africon51333.2021.9570964","DOIUrl":"https://doi.org/10.1109/africon51333.2021.9570964","url":null,"abstract":"The design of a four-pole reluctance motor with multiple objectives is discussed in this paper using a finite element design methodology based on multi-objective genetic algorithm. Non-dominated genetic algorithm (NSGA-II) is used because of its high performance and intensification in optimization problems. The global sensitivity chart revealed that the motor’s stator pole embrace and yoke thickness are key parameters for the optimization objectives, while the rotor’s pole embrace should be restrained and closely associated with these two key parameters. According to the optimization and sensitivity analysis results, a final design which is superior to the base design was achieved. There were 15 % and 13.2 % improvement in the optimized model in terms of the average torque and efficiency respectively. Also, the optimized model recorded a reduction in the average torque ripple and total loss by 1.55 % and 30.1 % respectively. This demonstrates the NSGA-II intelligent optimization program is a suitable framework to optimize specified objective functions.","PeriodicalId":170342,"journal":{"name":"2021 IEEE AFRICON","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127212395","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 : 2021-09-13DOI: 10.1109/africon51333.2021.9570846
Mohamed N. Elfikky, A. El-Morshedy, M. El-Shahat
The gradient of Arc Current (di/dt) and rate of rise of recovery voltage (RRRV) are used to study the capability of circuit breaker (CB) to interrupt different faults. The current interruption mechanism in high voltage direct current (HVDC) CB is complicated and needs an auxiliary circuit to generate current zero crossing. Mayr Arc Model is used to simulate the arc current interruption process. The effects of arc model parameters, arc time constant (τ) and cooling power (P), on di/dt and RRRV are presented in this work. It is found that the lower di/dt will appear at higher Arc time constant and lower cooling power values, but with limits. Contrary to di/dt, RRRV has lower values at low arc time constant values and high cooling power values, but Mayr arc model parameters have greater effect on di/dt than RRRV. This paper also addresses the effect of three types of fault impedance (resistive, inductive and capacitive) on di/dt and RRRV. A comparison is carried out for these fault impedances and shows good performance for capacitive impedance.
{"title":"Arc Parameters and Fault Impedance effect on the Gradient of Arc Current and Rate of Rise of Recovery Voltage in HVDC Circuit Breaker Using Mayr Arc Model.","authors":"Mohamed N. Elfikky, A. El-Morshedy, M. El-Shahat","doi":"10.1109/africon51333.2021.9570846","DOIUrl":"https://doi.org/10.1109/africon51333.2021.9570846","url":null,"abstract":"The gradient of Arc Current (di/dt) and rate of rise of recovery voltage (RRRV) are used to study the capability of circuit breaker (CB) to interrupt different faults. The current interruption mechanism in high voltage direct current (HVDC) CB is complicated and needs an auxiliary circuit to generate current zero crossing. Mayr Arc Model is used to simulate the arc current interruption process. The effects of arc model parameters, arc time constant (τ) and cooling power (P), on di/dt and RRRV are presented in this work. It is found that the lower di/dt will appear at higher Arc time constant and lower cooling power values, but with limits. Contrary to di/dt, RRRV has lower values at low arc time constant values and high cooling power values, but Mayr arc model parameters have greater effect on di/dt than RRRV. This paper also addresses the effect of three types of fault impedance (resistive, inductive and capacitive) on di/dt and RRRV. A comparison is carried out for these fault impedances and shows good performance for capacitive impedance.","PeriodicalId":170342,"journal":{"name":"2021 IEEE AFRICON","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127384864","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 : 2021-09-13DOI: 10.1109/africon51333.2021.9570907
Robert Macharia, K. Langat, P. Kihato
Collaborative beamforming (CBF) has been proposed as a viable tool towards increasing node transmission range in Wireless Sensor Networks (WSNs). This is highly essential in scenarios featuring highly elevated airborne sinks (Unmanned Aerial Vehicles (UAVs)) where multi-hop transmission is inconceivable. CBF yields radiation in unintended directions (sidelobes). A high sidelobe is bound to lead to interference at an UAV in the sidelobe’s direction (taking into consideration a case of multiple and mobile UAV sinks). A direct consequence of increased interference is reduction in communication capacity at the affected UAV. This paper presents a generalized sidelobe minimization scheme using Gravitational Search Algorithm (GSA). The effect of sidelobe minimization on the communication capacity at unintended UAVs is analyzed. Appreciable capacity increase is observed in comparison to a scheme featuring peak sidelobe minimization only.
{"title":"Interference Management upon Collaborative Beamforming in a Wireless Sensor Network Monitoring System featuring Multiple Unmanned Aerial Vehicles","authors":"Robert Macharia, K. Langat, P. Kihato","doi":"10.1109/africon51333.2021.9570907","DOIUrl":"https://doi.org/10.1109/africon51333.2021.9570907","url":null,"abstract":"Collaborative beamforming (CBF) has been proposed as a viable tool towards increasing node transmission range in Wireless Sensor Networks (WSNs). This is highly essential in scenarios featuring highly elevated airborne sinks (Unmanned Aerial Vehicles (UAVs)) where multi-hop transmission is inconceivable. CBF yields radiation in unintended directions (sidelobes). A high sidelobe is bound to lead to interference at an UAV in the sidelobe’s direction (taking into consideration a case of multiple and mobile UAV sinks). A direct consequence of increased interference is reduction in communication capacity at the affected UAV. This paper presents a generalized sidelobe minimization scheme using Gravitational Search Algorithm (GSA). The effect of sidelobe minimization on the communication capacity at unintended UAVs is analyzed. Appreciable capacity increase is observed in comparison to a scheme featuring peak sidelobe minimization only.","PeriodicalId":170342,"journal":{"name":"2021 IEEE AFRICON","volume":"63 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127407785","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 : 2021-09-13DOI: 10.1109/africon51333.2021.9570867
Baidenger Agyekum Twumasi, Jia‐lin Li, Ebenezer Tawiah Ashong, S. Menanor
This paper presents the design of a circular microstrip patch antenna time reversal mirror (TRM) for microwave wireless power transfer applications. The proposed antenna has 4.9 GHz bandwidth covering the 5.8 GHz WLAN band. Defects were used to improve the bandwidth and return loss of the proposed antenna TRM with enhanced radiation suitable for wireless power transfer for off-body biomedical applications. For the antenna time reversal mirror proposed, the slots act as scatterers enhancing the performance of the antenna time reversal mirror with transforming structures. The proposed antenna is designed on a microwave substrate of relative permittivity of 2.65 having a loss tangent of 0.003. It has a compact size of 30mm by 28mm. A rectangular bracket shaped slot was etched on the circular patch to improve its return loss with a maximum return loss of -55dB, better than -10dB with impedance bandwidth of 3.67-8.57 GHz and improved radiation pattern. Square slots were also etched on the partial ground plane of the proposed antenna.
{"title":"Circular Monopole Time Reversal Mirror for Microwave Wireless Power Transfer Applications","authors":"Baidenger Agyekum Twumasi, Jia‐lin Li, Ebenezer Tawiah Ashong, S. Menanor","doi":"10.1109/africon51333.2021.9570867","DOIUrl":"https://doi.org/10.1109/africon51333.2021.9570867","url":null,"abstract":"This paper presents the design of a circular microstrip patch antenna time reversal mirror (TRM) for microwave wireless power transfer applications. The proposed antenna has 4.9 GHz bandwidth covering the 5.8 GHz WLAN band. Defects were used to improve the bandwidth and return loss of the proposed antenna TRM with enhanced radiation suitable for wireless power transfer for off-body biomedical applications. For the antenna time reversal mirror proposed, the slots act as scatterers enhancing the performance of the antenna time reversal mirror with transforming structures. The proposed antenna is designed on a microwave substrate of relative permittivity of 2.65 having a loss tangent of 0.003. It has a compact size of 30mm by 28mm. A rectangular bracket shaped slot was etched on the circular patch to improve its return loss with a maximum return loss of -55dB, better than -10dB with impedance bandwidth of 3.67-8.57 GHz and improved radiation pattern. Square slots were also etched on the partial ground plane of the proposed antenna.","PeriodicalId":170342,"journal":{"name":"2021 IEEE AFRICON","volume":"48 9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130351283","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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