Pub Date : 2021-09-01DOI: 10.1109/RI2C51727.2021.9559804
W. Chanwattanapong, Suthat Hongdumnuen, Boonyarit Kumkhet, Supaset Junon, Pubet Sangmahamad
Our research proposed the prototypes of a Long Range (LoRa) network for agriculture application, which focuses on low-cost and effectiveness with multi-wireless environment sensor nodes in a network. each sensors node consisting of several sensors such as a soil moisture sensor, a temperature and humidity sensor, a raindrops sensor, and a light intensity sensor. The soil moisture sensor has been designed with 4 copper sensing-rods that a longest copper rod act as a ground signal level and other copper sensing-rods using for measures moisture at each soil depth. The different levels of soil depth with respect to the ground surface. A Heltec LoRa esp32 sx1276 acts as a LoRa wireless communication module for long-range environment data transfer. The proposed network that operating with two wireless communication frequency bands, 925.2MHz for node-to-gateway communication and 2.4GHz (WLAN) for gateway-to-cloud communication. Furthermore, the proposed network with three wireless sensor nodes and a single LoRa gateway was experimental. From the experimental results, the sensor node able to environmental sensing and transfer data to the gateway. The environmental data of soil moisture under the ground surface 20cm, 40cm, and 60 cm more than 90% accuracy compared to the standard instrument. Additionally, the LoRa transceiver range is approximately 600 meters (Non-line-of-sight: NLOS) and the LoRa gateway automatically transmits environmental data to the cloud storage every 15 seconds.
{"title":"LoRa Network Based Multi-Wireless Sensor Nodes and LoRa Gateway for Agriculture Application","authors":"W. Chanwattanapong, Suthat Hongdumnuen, Boonyarit Kumkhet, Supaset Junon, Pubet Sangmahamad","doi":"10.1109/RI2C51727.2021.9559804","DOIUrl":"https://doi.org/10.1109/RI2C51727.2021.9559804","url":null,"abstract":"Our research proposed the prototypes of a Long Range (LoRa) network for agriculture application, which focuses on low-cost and effectiveness with multi-wireless environment sensor nodes in a network. each sensors node consisting of several sensors such as a soil moisture sensor, a temperature and humidity sensor, a raindrops sensor, and a light intensity sensor. The soil moisture sensor has been designed with 4 copper sensing-rods that a longest copper rod act as a ground signal level and other copper sensing-rods using for measures moisture at each soil depth. The different levels of soil depth with respect to the ground surface. A Heltec LoRa esp32 sx1276 acts as a LoRa wireless communication module for long-range environment data transfer. The proposed network that operating with two wireless communication frequency bands, 925.2MHz for node-to-gateway communication and 2.4GHz (WLAN) for gateway-to-cloud communication. Furthermore, the proposed network with three wireless sensor nodes and a single LoRa gateway was experimental. From the experimental results, the sensor node able to environmental sensing and transfer data to the gateway. The environmental data of soil moisture under the ground surface 20cm, 40cm, and 60 cm more than 90% accuracy compared to the standard instrument. Additionally, the LoRa transceiver range is approximately 600 meters (Non-line-of-sight: NLOS) and the LoRa gateway automatically transmits environmental data to the cloud storage every 15 seconds.","PeriodicalId":422981,"journal":{"name":"2021 Research, Invention, and Innovation Congress: Innovation Electricals and Electronics (RI2C)","volume":"211 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121214310","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 : 2021-09-01DOI: 10.1109/RI2C51727.2021.9559770
N. Chudpooti, Patchadaporn Sangpet, Nattapong Duangrit, P. Akkaraekthalin, I. Robertson, N. Somjit
This paper presents a 3D-printed hemispherical lens integrated with flower-shaped stub antenna for liquid-mixture characterization. The proposed lens antenna is designed, fabricated, and integrated with the ultra-wideband planar antenna. A high impact polystyrene (HIPs) is selected to design the 3D-printed lens antenna by using the fused deposition modelling (FDM) technique, due to low loss 3D-printed material. The optimum the dimensions of the lens antenna are obtained by using the 3D EM Simulation CST Studio, which is used to investigate the performance of the antenna, e.g., gain, radiation pattern and reflection coefficient. To discriminate the liquid content in ethanol-water mixture, the level of the transmission coefficient (S21) is detected. The proposed sensor system offers various preferable features, e.g., non-destructive method and non-contact measurement. Five samples, e.g., 60%, 65%, 70%, 75%, and 80% ethanol in the ethanol-water mixtures, are measured and performed to generate the extraction model. The proposed sensor also offers other advantages, e.g., real-time monitoring and no life-cycle limitation.
{"title":"An Integrated 3D-Printed Lens with Ultra-Wideband Flower-Shaped Stub Antenna for Ethanol-Water Mixture Characterization","authors":"N. Chudpooti, Patchadaporn Sangpet, Nattapong Duangrit, P. Akkaraekthalin, I. Robertson, N. Somjit","doi":"10.1109/RI2C51727.2021.9559770","DOIUrl":"https://doi.org/10.1109/RI2C51727.2021.9559770","url":null,"abstract":"This paper presents a 3D-printed hemispherical lens integrated with flower-shaped stub antenna for liquid-mixture characterization. The proposed lens antenna is designed, fabricated, and integrated with the ultra-wideband planar antenna. A high impact polystyrene (HIPs) is selected to design the 3D-printed lens antenna by using the fused deposition modelling (FDM) technique, due to low loss 3D-printed material. The optimum the dimensions of the lens antenna are obtained by using the 3D EM Simulation CST Studio, which is used to investigate the performance of the antenna, e.g., gain, radiation pattern and reflection coefficient. To discriminate the liquid content in ethanol-water mixture, the level of the transmission coefficient (S21) is detected. The proposed sensor system offers various preferable features, e.g., non-destructive method and non-contact measurement. Five samples, e.g., 60%, 65%, 70%, 75%, and 80% ethanol in the ethanol-water mixtures, are measured and performed to generate the extraction model. The proposed sensor also offers other advantages, e.g., real-time monitoring and no life-cycle limitation.","PeriodicalId":422981,"journal":{"name":"2021 Research, Invention, and Innovation Congress: Innovation Electricals and Electronics (RI2C)","volume":"118 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124881956","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 : 2021-09-01DOI: 10.1109/RI2C51727.2021.9559833
Tippawan Meepung, P. Wannapiroon, P. Nilsook
The development of knowledge and skills of learners and teachers is a guideline for the development of new technologies and innovations which therefore affects the development of the knowledge-based economy. To make existing resources on campus to bring in values in a strategic manner by applying research to industrial use, it must use a support mechanism in the form of a digital technology ecosystem to transform the traditional university operating model into a university that supports entrepreneurship. And in order for the university to develop and build strength from within: policies are needed to allocate appropriate internal resources and the understanding of intellectual property should be established. The results publishing with technology and mutual relationship between the industry and the government then should directly affect economic growth. The university is comprised of large and complex systems. Enterprise Architecture is a strategic planning tool for organizing technology in an organization. By following the principles and practices to Framework development of enterprise architecture developers, it results in an overall system in the organization for systematic design which is consisted of 1) Business architecture, 2) Data architecture, 3) Applications architecture, and 4) Technology architecture. This research aims to synthesize enterprise architecture framework from related research papers, to analyze digital university elements from the digital action plan, to synthesize the Entrepreneurial University framework, and to synthesize enterprise architecture elements for Digital Entrepreneurial University.
{"title":"Transition Elements, Enterprise Architecture for Digital Entrepreneurial University","authors":"Tippawan Meepung, P. Wannapiroon, P. Nilsook","doi":"10.1109/RI2C51727.2021.9559833","DOIUrl":"https://doi.org/10.1109/RI2C51727.2021.9559833","url":null,"abstract":"The development of knowledge and skills of learners and teachers is a guideline for the development of new technologies and innovations which therefore affects the development of the knowledge-based economy. To make existing resources on campus to bring in values in a strategic manner by applying research to industrial use, it must use a support mechanism in the form of a digital technology ecosystem to transform the traditional university operating model into a university that supports entrepreneurship. And in order for the university to develop and build strength from within: policies are needed to allocate appropriate internal resources and the understanding of intellectual property should be established. The results publishing with technology and mutual relationship between the industry and the government then should directly affect economic growth. The university is comprised of large and complex systems. Enterprise Architecture is a strategic planning tool for organizing technology in an organization. By following the principles and practices to Framework development of enterprise architecture developers, it results in an overall system in the organization for systematic design which is consisted of 1) Business architecture, 2) Data architecture, 3) Applications architecture, and 4) Technology architecture. This research aims to synthesize enterprise architecture framework from related research papers, to analyze digital university elements from the digital action plan, to synthesize the Entrepreneurial University framework, and to synthesize enterprise architecture elements for Digital Entrepreneurial University.","PeriodicalId":422981,"journal":{"name":"2021 Research, Invention, and Innovation Congress: Innovation Electricals and Electronics (RI2C)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125868712","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 : 2021-09-01DOI: 10.1109/RI2C51727.2021.9559810
Pongsathorn Chomdee, A. Boonpoonga, P. Akkaraekthalin, T. Lertwiriyaprapa
In this paper, the radar target identification system for inspection of rail sweep is proposed. In the proposed system, the short pulse is transmitted to impinge the rail and the signal scattered from the rail is then received to perform the signal processing for identification. The matrix pencil method is employed to extract poles from the late-time response of the scattering signal. Extracted poles are exploited as unique signatures of the individual rail defection. One of the most defections due to the manufacturing production errors is the rail sweep. In this paper, simulations were conducted to validate that the extracted poles from the response of the normal rail is different from those of the swept rail. The BS100A rails with different sweep angles i.e. 0°, 10°, 15°, 30° and 45° are modeled by using CST microwave studio. The simulation results show that poles extracted from the late-time response of the normal rail are significantly different from those of the swept one. The simulation results confirmed the superiority of the proposed system over the conventional one using the visual inspection.
{"title":"Inspection of Rail Sweep Using Matrix Pencil Method Based-Radar Target Identification","authors":"Pongsathorn Chomdee, A. Boonpoonga, P. Akkaraekthalin, T. Lertwiriyaprapa","doi":"10.1109/RI2C51727.2021.9559810","DOIUrl":"https://doi.org/10.1109/RI2C51727.2021.9559810","url":null,"abstract":"In this paper, the radar target identification system for inspection of rail sweep is proposed. In the proposed system, the short pulse is transmitted to impinge the rail and the signal scattered from the rail is then received to perform the signal processing for identification. The matrix pencil method is employed to extract poles from the late-time response of the scattering signal. Extracted poles are exploited as unique signatures of the individual rail defection. One of the most defections due to the manufacturing production errors is the rail sweep. In this paper, simulations were conducted to validate that the extracted poles from the response of the normal rail is different from those of the swept rail. The BS100A rails with different sweep angles i.e. 0°, 10°, 15°, 30° and 45° are modeled by using CST microwave studio. The simulation results show that poles extracted from the late-time response of the normal rail are significantly different from those of the swept one. The simulation results confirmed the superiority of the proposed system over the conventional one using the visual inspection.","PeriodicalId":422981,"journal":{"name":"2021 Research, Invention, and Innovation Congress: Innovation Electricals and Electronics (RI2C)","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122868459","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 : 2021-09-01DOI: 10.1109/RI2C51727.2021.9559797
J. Polpinij, K. Namee
Sentiment classification (SC) is an ongoing field of research, which involves computing opinions, sentiments, and the subjectivity of a text. It has recently been proven that imbalanced classification is challenging for the SC research community. Most existing studies assume that the balance between negative and positive samples may not be true in reality. This work describes a method to improve the problem of imbalanced sentiment classification using supervised term weighting schemes and shows how these weighting schemes can improve the performance of sentiment classification with imbalanced data, especially in the domain of multi-class classification. Nonetheless, to obtain the most appropriate term weighting schemes, five term weighting schemes are comparatively studied, namely tf-idf, tf-idf-icf, tf-rf, tf-igm, and sqrt_tf-igm. In addition to comparing several term weightings schemes, this work also compares four supervised machine learning algorithms to obtain an appropriate algorithm, including k-Nearest Neighbor (k-NN), Multinomial Naïve Bayes (MNB), Support Vector Machines (SVM) with linear, and SVM with RBF. After evaluating by F1, the performance of sqrt_tf-igm was superior to all other weighting schemes. Since the overall picture of sqrt_tf-igm returned better results than the tf-idf, tf-idf-icf, and tf-rf methods, with improved scores of F1 at 10.94%. Meanwhile, the result of sqrt_tf-igm was slightly better than tf-igm.
{"title":"Improving of Imbalanced Data in Multiclass Classification for Sentiment Analysis using Supervised Term Weighting","authors":"J. Polpinij, K. Namee","doi":"10.1109/RI2C51727.2021.9559797","DOIUrl":"https://doi.org/10.1109/RI2C51727.2021.9559797","url":null,"abstract":"Sentiment classification (SC) is an ongoing field of research, which involves computing opinions, sentiments, and the subjectivity of a text. It has recently been proven that imbalanced classification is challenging for the SC research community. Most existing studies assume that the balance between negative and positive samples may not be true in reality. This work describes a method to improve the problem of imbalanced sentiment classification using supervised term weighting schemes and shows how these weighting schemes can improve the performance of sentiment classification with imbalanced data, especially in the domain of multi-class classification. Nonetheless, to obtain the most appropriate term weighting schemes, five term weighting schemes are comparatively studied, namely tf-idf, tf-idf-icf, tf-rf, tf-igm, and sqrt_tf-igm. In addition to comparing several term weightings schemes, this work also compares four supervised machine learning algorithms to obtain an appropriate algorithm, including k-Nearest Neighbor (k-NN), Multinomial Naïve Bayes (MNB), Support Vector Machines (SVM) with linear, and SVM with RBF. After evaluating by F1, the performance of sqrt_tf-igm was superior to all other weighting schemes. Since the overall picture of sqrt_tf-igm returned better results than the tf-idf, tf-idf-icf, and tf-rf methods, with improved scores of F1 at 10.94%. Meanwhile, the result of sqrt_tf-igm was slightly better than tf-igm.","PeriodicalId":422981,"journal":{"name":"2021 Research, Invention, and Innovation Congress: Innovation Electricals and Electronics (RI2C)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122584179","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 : 2021-09-01DOI: 10.1109/RI2C51727.2021.9559798
Natthapat Thongsak, Nuanpan Lawson
This paper proposes two new classes of dual to modified ratio estimators for estimating population mean when information on a known auxiliary variable is available, and was inspired by Jaroengeratikun and Lawson (2019) and uses the transformation of auxiliary variables technique under simple random sampling without replacement. The general expressions of the bias and mean square errors (MSEs) of the proposed classes of estimators up to the first order of approximation have been obtained. The performance of the proposed classes of estimators are compared with existing estimators using a theoretical approach, a simulation study, and an application to real data. In the simulation study and practical application, the percentage relative efficiency (PREs) of all estimators with respect to the usual ratio estimator are used to compare the performance of the proposed class of estimators. The proposed classes of dual to modified ratio estimators are found to be more efficient than the existing estimators in the estimation of the population mean under a certain given condition.
{"title":"Classes of Dual to Modified Ratio Estimators for Estimating Population Mean in Simple Random Sampling","authors":"Natthapat Thongsak, Nuanpan Lawson","doi":"10.1109/RI2C51727.2021.9559798","DOIUrl":"https://doi.org/10.1109/RI2C51727.2021.9559798","url":null,"abstract":"This paper proposes two new classes of dual to modified ratio estimators for estimating population mean when information on a known auxiliary variable is available, and was inspired by Jaroengeratikun and Lawson (2019) and uses the transformation of auxiliary variables technique under simple random sampling without replacement. The general expressions of the bias and mean square errors (MSEs) of the proposed classes of estimators up to the first order of approximation have been obtained. The performance of the proposed classes of estimators are compared with existing estimators using a theoretical approach, a simulation study, and an application to real data. In the simulation study and practical application, the percentage relative efficiency (PREs) of all estimators with respect to the usual ratio estimator are used to compare the performance of the proposed class of estimators. The proposed classes of dual to modified ratio estimators are found to be more efficient than the existing estimators in the estimation of the population mean under a certain given condition.","PeriodicalId":422981,"journal":{"name":"2021 Research, Invention, and Innovation Congress: Innovation Electricals and Electronics (RI2C)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130245961","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 : 2021-09-01DOI: 10.1109/RI2C51727.2021.9559832
C. Yensiri, C. Seetao, Pomwilai Sukmak, M. Lohakan
This research proposes a training set of digital image processing using LabVIEW for object inspection topic. The collection consists of a conveyor set, digital camera, a robot arm, a training book, and 12 VDO clips. The conveyor base and frame are elaborately created by a 3D printer with PLA plastic. The conveyor which rotates circularly is driven by a dc motor. It is graphically controlled by LabVIEW, which interfaces with a microcontroller board and dc motor. A robot arm operates as a rejecting arm, pushing an unwanted object away from the conveyor. The inspection process employs a real-time USB camera and infrared light sensors incorporating a digital image processing algorithm. Additionally, the training book comprises of 12 chapters which match with 12 VDO clips combined as a learning set. A batch of VDO clips is published online through the YouTube channel. Content examples are color detection, object shape classification, motor control, reject arm control, and water level inspection. Details of each chapter are apparatus preparation, the graphically programming process, and GUI design. The 12 VDO clips are also added to the training package for self-study. A compact size and easiness to replicate and carry of conveyor set are the advantages of the training set. The training package was evaluated by 6 expert lecturers from the department of Teacher Training in Electrical Engineering, KMUTNB, with an average value of 4.30 from 5. The training set also is assessed by 26 students from the senior class. Finally, the evaluated results show that the training set can improve student's enthusiasm, and easy understanding and serve as encouragement.
{"title":"A Training Set of Digital Image Processing for Object Inspection using Lab VIEW","authors":"C. Yensiri, C. Seetao, Pomwilai Sukmak, M. Lohakan","doi":"10.1109/RI2C51727.2021.9559832","DOIUrl":"https://doi.org/10.1109/RI2C51727.2021.9559832","url":null,"abstract":"This research proposes a training set of digital image processing using LabVIEW for object inspection topic. The collection consists of a conveyor set, digital camera, a robot arm, a training book, and 12 VDO clips. The conveyor base and frame are elaborately created by a 3D printer with PLA plastic. The conveyor which rotates circularly is driven by a dc motor. It is graphically controlled by LabVIEW, which interfaces with a microcontroller board and dc motor. A robot arm operates as a rejecting arm, pushing an unwanted object away from the conveyor. The inspection process employs a real-time USB camera and infrared light sensors incorporating a digital image processing algorithm. Additionally, the training book comprises of 12 chapters which match with 12 VDO clips combined as a learning set. A batch of VDO clips is published online through the YouTube channel. Content examples are color detection, object shape classification, motor control, reject arm control, and water level inspection. Details of each chapter are apparatus preparation, the graphically programming process, and GUI design. The 12 VDO clips are also added to the training package for self-study. A compact size and easiness to replicate and carry of conveyor set are the advantages of the training set. The training package was evaluated by 6 expert lecturers from the department of Teacher Training in Electrical Engineering, KMUTNB, with an average value of 4.30 from 5. The training set also is assessed by 26 students from the senior class. Finally, the evaluated results show that the training set can improve student's enthusiasm, and easy understanding and serve as encouragement.","PeriodicalId":422981,"journal":{"name":"2021 Research, Invention, and Innovation Congress: Innovation Electricals and Electronics (RI2C)","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134430608","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 : 2021-09-01DOI: 10.1109/RI2C51727.2021.9559808
Sukanya Chudpooti, Patchadaporn Sangpet, S. Chalermwisutkul, D. Torrungrueng, P. Akkaraekthalin
This paper presents a designed partially reflective surface (PRS) with a low-cost substrate for gain enhancement in the dual-polarized antenna. The conventional microstrip patch antenna, with the operating frequency at 3.5 GHz, is selected to use for a source. Two SMA ports with a 90-degree difference phase are fed into the patch antenna to create a dual-polarization. The PRS is designed based on the unit cell of a square metallic patch. The dimension of the unit cell is 5 mm × 5 mm. To investigate the performance of the PRS design, the fully 3D-simulation software, CST-Studio, is used to monitor all parameters, e.g., reflection magnitude, reflection phase, and realized gain. Four conditions on the square patch are carefully chosen by varying the dimension of the square patch from 3 mm to 4.5 mm with a step of 0.5 mm. Based on simulated results, the maximum gain at the zero degrees is increased from 1.68 dBi to 5.82 dBi, when compared with and without an integrated partially reflective surface.
{"title":"A Low-Cost Partially Reflective Surface for Gain Enhancement of Dual Polarized Microstrip Patch Antenna","authors":"Sukanya Chudpooti, Patchadaporn Sangpet, S. Chalermwisutkul, D. Torrungrueng, P. Akkaraekthalin","doi":"10.1109/RI2C51727.2021.9559808","DOIUrl":"https://doi.org/10.1109/RI2C51727.2021.9559808","url":null,"abstract":"This paper presents a designed partially reflective surface (PRS) with a low-cost substrate for gain enhancement in the dual-polarized antenna. The conventional microstrip patch antenna, with the operating frequency at 3.5 GHz, is selected to use for a source. Two SMA ports with a 90-degree difference phase are fed into the patch antenna to create a dual-polarization. The PRS is designed based on the unit cell of a square metallic patch. The dimension of the unit cell is 5 mm × 5 mm. To investigate the performance of the PRS design, the fully 3D-simulation software, CST-Studio, is used to monitor all parameters, e.g., reflection magnitude, reflection phase, and realized gain. Four conditions on the square patch are carefully chosen by varying the dimension of the square patch from 3 mm to 4.5 mm with a step of 0.5 mm. Based on simulated results, the maximum gain at the zero degrees is increased from 1.68 dBi to 5.82 dBi, when compared with and without an integrated partially reflective surface.","PeriodicalId":422981,"journal":{"name":"2021 Research, Invention, and Innovation Congress: Innovation Electricals and Electronics (RI2C)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131368994","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 : 2021-09-01DOI: 10.1109/RI2C51727.2021.9559830
Sathaporn Konjunthes, S. Chalermwisutkul, P. Akkaraekthalin, W. Thaiwirot
This paper presents a wideband circularly polarized stacked patch antenna for universal UHF RFID readers. The proposed antenna consists of a slanted elliptical microstrip patch layer, corner truncated patch layer, a horizontally meandered strip (HMS) layer, and a corner truncated ground plane. A slated elliptical patch, which is the main radiating patch, is etched on one side of a FR4 substrate in order to achieve circular polarization. The slated elliptical patch is fed through the HMS. This HMS is placed below the slanted elliptical patch to improve the impedance bandwidth. One end of the HMS is connected to the ground plane via SMA connector, while the other end is connected to the main radiating patch by the probe. In order to further enhance the bandwidth, the parasitic truncated patch is placed above the main radiating patch. In addition, the truncation of the ground plane is used to control the AR bandwidth. The proposed antenna has an overall size of 250 x 250 x 54 mm3. The measured results show that the proposed antenna can provide the impedance bandwidth of about 149 MHz (817 – 966 MHz) or 16.7%, a 3-dB axial ratio (AR) bandwidth of about 170 MHz (830 – 1000 MHz) or 18.5%, and maximum gain of about 8.4 dBi. The proposed antenna can operate at the UHF band of 840 – 960 MHz, which covers the bandwidth of universal UHF RFID readers.
{"title":"Design and Experiment of a Wideband Circularly Polarized Stacked Patch Antenna for Universal UHF RFID Readers","authors":"Sathaporn Konjunthes, S. Chalermwisutkul, P. Akkaraekthalin, W. Thaiwirot","doi":"10.1109/RI2C51727.2021.9559830","DOIUrl":"https://doi.org/10.1109/RI2C51727.2021.9559830","url":null,"abstract":"This paper presents a wideband circularly polarized stacked patch antenna for universal UHF RFID readers. The proposed antenna consists of a slanted elliptical microstrip patch layer, corner truncated patch layer, a horizontally meandered strip (HMS) layer, and a corner truncated ground plane. A slated elliptical patch, which is the main radiating patch, is etched on one side of a FR4 substrate in order to achieve circular polarization. The slated elliptical patch is fed through the HMS. This HMS is placed below the slanted elliptical patch to improve the impedance bandwidth. One end of the HMS is connected to the ground plane via SMA connector, while the other end is connected to the main radiating patch by the probe. In order to further enhance the bandwidth, the parasitic truncated patch is placed above the main radiating patch. In addition, the truncation of the ground plane is used to control the AR bandwidth. The proposed antenna has an overall size of 250 x 250 x 54 mm3. The measured results show that the proposed antenna can provide the impedance bandwidth of about 149 MHz (817 – 966 MHz) or 16.7%, a 3-dB axial ratio (AR) bandwidth of about 170 MHz (830 – 1000 MHz) or 18.5%, and maximum gain of about 8.4 dBi. The proposed antenna can operate at the UHF band of 840 – 960 MHz, which covers the bandwidth of universal UHF RFID readers.","PeriodicalId":422981,"journal":{"name":"2021 Research, Invention, and Innovation Congress: Innovation Electricals and Electronics (RI2C)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115374514","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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