Pub Date : 2008-12-01DOI: 10.1109/RFM.2008.4897454
A.K.H. Obsiye, H. E. Abdel-Raouf, R. El-Islam
In this paper we present the design of a modified crescent antenna for Ultrawideband (UWB) Radio Frequency identification (RFID) tag. Different studies to optimize the design of this antenna for the UWB-RFID system have been performed, particularly to overcome the main challenges such as minimizing the size of the antenna, improving its read range, and the effects of the metallic objects on the antenna performance. As a result of this study, the proposed antenna has a maximum read range between 5.4 m and 7.5 m with the ability to work in the UWB when the antenna is close to metallic objects.
{"title":"Modified printed crescent patch antenna for Ultrawideband RFID (UWB-RFID) tag","authors":"A.K.H. Obsiye, H. E. Abdel-Raouf, R. El-Islam","doi":"10.1109/RFM.2008.4897454","DOIUrl":"https://doi.org/10.1109/RFM.2008.4897454","url":null,"abstract":"In this paper we present the design of a modified crescent antenna for Ultrawideband (UWB) Radio Frequency identification (RFID) tag. Different studies to optimize the design of this antenna for the UWB-RFID system have been performed, particularly to overcome the main challenges such as minimizing the size of the antenna, improving its read range, and the effects of the metallic objects on the antenna performance. As a result of this study, the proposed antenna has a maximum read range between 5.4 m and 7.5 m with the ability to work in the UWB when the antenna is close to metallic objects.","PeriodicalId":329128,"journal":{"name":"2008 IEEE International RF and Microwave Conference","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130990166","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 : 2008-12-01DOI: 10.1109/RFM.2008.4897420
F. N. Khan, F. Mohammadi, M. Yagoub
In this work, the authors present a highly efficient GaN HEMT Class-F amplifier designed for Universal Mobile Telecommunications Systems using Wideband Code Division Multiple Access (UMTS/WCDMA). The amplifier has a peak PAE of 76% with an output power of 10.5 W. A comparison between class-F and inverse Class-F was also made.
{"title":"A GaN HEMT Class-F amplifier for UMTS/WCDMA applications","authors":"F. N. Khan, F. Mohammadi, M. Yagoub","doi":"10.1109/RFM.2008.4897420","DOIUrl":"https://doi.org/10.1109/RFM.2008.4897420","url":null,"abstract":"In this work, the authors present a highly efficient GaN HEMT Class-F amplifier designed for Universal Mobile Telecommunications Systems using Wideband Code Division Multiple Access (UMTS/WCDMA). The amplifier has a peak PAE of 76% with an output power of 10.5 W. A comparison between class-F and inverse Class-F was also made.","PeriodicalId":329128,"journal":{"name":"2008 IEEE International RF and Microwave Conference","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125444495","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 : 2008-12-01DOI: 10.1109/RFM.2008.4897405
T. Masri, M. Rahim, F. Zubir, O. Ayop, M. Karim, H. Majid
For a point-to-point communication system, an antenna array with high gain is essential and in this work, by incorporating electromagnetic band gap (EBG) structures at a specific location within the antenna's peripherals, the gain of the antenna could be enhanced further. The EBG structures reduced mutual couplings between the adjacent patches thus make them radiates effectively. On the other hand, the EBG structures located at the edge of the antenna suppressed surface waves and prevent it from propagating to the edges, thus reduced the side and back lobes. This further enhances the front radiation characteristics of the antenna and also increased the gain. The techniques and guidelines on how to achieve the objectives is presented and the simulated and measured results complement each other.
{"title":"Microstrip antenna array's gain enhancement via Electromagnetic Band Gap structures","authors":"T. Masri, M. Rahim, F. Zubir, O. Ayop, M. Karim, H. Majid","doi":"10.1109/RFM.2008.4897405","DOIUrl":"https://doi.org/10.1109/RFM.2008.4897405","url":null,"abstract":"For a point-to-point communication system, an antenna array with high gain is essential and in this work, by incorporating electromagnetic band gap (EBG) structures at a specific location within the antenna's peripherals, the gain of the antenna could be enhanced further. The EBG structures reduced mutual couplings between the adjacent patches thus make them radiates effectively. On the other hand, the EBG structures located at the edge of the antenna suppressed surface waves and prevent it from propagating to the edges, thus reduced the side and back lobes. This further enhances the front radiation characteristics of the antenna and also increased the gain. The techniques and guidelines on how to achieve the objectives is presented and the simulated and measured results complement each other.","PeriodicalId":329128,"journal":{"name":"2008 IEEE International RF and Microwave Conference","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126832132","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 : 2008-12-01DOI: 10.1109/RFM.2008.4897393
A.S. Chahine, U. Okonkwo, R. Ngah
Radio-over-fiber (ROF) technology has several advantages such as providing huge bandwidth, inherent immunity to electromagnetic interference and reduced power consumption. This paper presents a simulation to investigate the performance of orthogonal frequency division multiplexing (OFDM) as a modulation technique to transmit the basebands signal over fiber. The model contains a laser diode used as optical modulator to convert the signal from baseband to optical frequency. The QPSK-OFDM transmitted signal and power spectrum are obtained for both of AWGN and optical fiber link channels. The study reveals that the OFDM performance on the optical fiber link in terms of spectrum containment is nearly similar to that on AWGN channel. The significance of this study comes from the promising future of using optical fibers to transmit radio signal. Consequently the model of this paper can be used with different wireless communication systems such as wireless LANs and digital video broadcasting (DVB) and it is supporting to the 4th generation cellular systems. The details of design and simulated results for the proposed model are presented and discussed.
{"title":"Study the performance of OFDM radio over fiber for wireless communication systems","authors":"A.S. Chahine, U. Okonkwo, R. Ngah","doi":"10.1109/RFM.2008.4897393","DOIUrl":"https://doi.org/10.1109/RFM.2008.4897393","url":null,"abstract":"Radio-over-fiber (ROF) technology has several advantages such as providing huge bandwidth, inherent immunity to electromagnetic interference and reduced power consumption. This paper presents a simulation to investigate the performance of orthogonal frequency division multiplexing (OFDM) as a modulation technique to transmit the basebands signal over fiber. The model contains a laser diode used as optical modulator to convert the signal from baseband to optical frequency. The QPSK-OFDM transmitted signal and power spectrum are obtained for both of AWGN and optical fiber link channels. The study reveals that the OFDM performance on the optical fiber link in terms of spectrum containment is nearly similar to that on AWGN channel. The significance of this study comes from the promising future of using optical fibers to transmit radio signal. Consequently the model of this paper can be used with different wireless communication systems such as wireless LANs and digital video broadcasting (DVB) and it is supporting to the 4th generation cellular systems. The details of design and simulated results for the proposed model are presented and discussed.","PeriodicalId":329128,"journal":{"name":"2008 IEEE International RF and Microwave Conference","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125202510","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 : 2008-12-01DOI: 10.1109/RFM.2008.4897354
K. Ito
In recent years, various types of medical applications of antennas have widely been investigated and reported. Typical recent applications are in Information transmission such as RFID (radio frequency identification)/wearable or implantable monitor and wireless telemedicine/mobile health system and in diagnosis such as MRI (magnetic resonance imaging)/fMRI and microwave CT (computed tomography)/radiometry. Other application includes in treatment such as thermal therapy (Hyperthermia, Coagulation, etc) and microwave knife. In this presentation, three different types of antennas which have been studied in our laboratory are introduced. Firstly, a pretty small antenna for an implantable monitoring system is presented. An H-shaped cavity slot antenna is a candidate for such a system. Some numerical and experimental characteristics of the antenna are demonstrated. Secondly, some different antennas or ldquoRF coilsrdquo for MRI systems are introduced. In addition, SAR (specific absorption rate) distributions in the abdomen of a pregnant woman generated in a bird cage coil are illustrated. Finally, after a brief overview of thermal therapy and microwave heating, coaxial-slot antennas and array applicators composed of several coaxial-slot antennas for minimally invasive microwave thermal therapies are introduced. Then a few results of actual clinical trials by use of the coaxial-slot antennas are demonstrated from a technical point of view. Other therapeutic applications of the coaxial-slot antennas such as hyperthermic treatment for brain tumor and intracavitary hyperthermia for bile duct carcinoma are introduced.
{"title":"Keynote 2: Microwave antennas for medical applications","authors":"K. Ito","doi":"10.1109/RFM.2008.4897354","DOIUrl":"https://doi.org/10.1109/RFM.2008.4897354","url":null,"abstract":"In recent years, various types of medical applications of antennas have widely been investigated and reported. Typical recent applications are in Information transmission such as RFID (radio frequency identification)/wearable or implantable monitor and wireless telemedicine/mobile health system and in diagnosis such as MRI (magnetic resonance imaging)/fMRI and microwave CT (computed tomography)/radiometry. Other application includes in treatment such as thermal therapy (Hyperthermia, Coagulation, etc) and microwave knife. In this presentation, three different types of antennas which have been studied in our laboratory are introduced. Firstly, a pretty small antenna for an implantable monitoring system is presented. An H-shaped cavity slot antenna is a candidate for such a system. Some numerical and experimental characteristics of the antenna are demonstrated. Secondly, some different antennas or ldquoRF coilsrdquo for MRI systems are introduced. In addition, SAR (specific absorption rate) distributions in the abdomen of a pregnant woman generated in a bird cage coil are illustrated. Finally, after a brief overview of thermal therapy and microwave heating, coaxial-slot antennas and array applicators composed of several coaxial-slot antennas for minimally invasive microwave thermal therapies are introduced. Then a few results of actual clinical trials by use of the coaxial-slot antennas are demonstrated from a technical point of view. Other therapeutic applications of the coaxial-slot antennas such as hyperthermic treatment for brain tumor and intracavitary hyperthermia for bile duct carcinoma are introduced.","PeriodicalId":329128,"journal":{"name":"2008 IEEE International RF and Microwave Conference","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122641651","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 : 2008-12-01DOI: 10.1109/RFM.2008.4897469
Wen-Lin Chen, Sheng-Fuh Chang, Kun-Ming Chen, K. Liao, G. Huang, J. Chang
A hybrid OPEN model, which consists of equivalent circuit model and behavior transmission line (TL) model, is proposed to accurately extract device characteristics. The proposed method requires only one OPEN dummy structure so the silicon occupation area is efficiently reduced. The other benefit is it avoids the errors, which is occurred while performing the classical de-embedding procedure. A Ka-band CPW filter is fabricated in 130 nm RF CMOS technique to prove this method is efficient up to 67 GHz.
{"title":"A hybrid OPEN model technique for accurate device characterization","authors":"Wen-Lin Chen, Sheng-Fuh Chang, Kun-Ming Chen, K. Liao, G. Huang, J. Chang","doi":"10.1109/RFM.2008.4897469","DOIUrl":"https://doi.org/10.1109/RFM.2008.4897469","url":null,"abstract":"A hybrid OPEN model, which consists of equivalent circuit model and behavior transmission line (TL) model, is proposed to accurately extract device characteristics. The proposed method requires only one OPEN dummy structure so the silicon occupation area is efficiently reduced. The other benefit is it avoids the errors, which is occurred while performing the classical de-embedding procedure. A Ka-band CPW filter is fabricated in 130 nm RF CMOS technique to prove this method is efficient up to 67 GHz.","PeriodicalId":329128,"journal":{"name":"2008 IEEE International RF and Microwave Conference","volume":"93 Pt A 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122656086","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 : 2008-12-01DOI: 10.1109/RFM.2008.4897394
W. H. Choo, M. Kawasaki, F. Kung
The demand for industry-ready RF engineering graduates is increasing in tandem with the growth in wireless industries, and reduction in product time-to-market, creating an acute shortage of RF engineers world-wide. The complexities of RF theories, lack of exposure to relevant industry tools and missing domain knowledge in various functions within the industry further aggravates the situation. This paper outlines key aspects of developing a comprehensive teaching solution for RF engineers that closes this gap and benefits universities and industry. Critical job functions, skill sets, domain knowledge and engineering concepts are mapped systematically, resulting in a comprehensive solution encompassing teaching slide sets, a training kit, industry-standard measurement equipment, RF design software, test automation software, a course quality management template, problem-based assignments and train-the-trainer program.
{"title":"RF engineering education - the approach to bridging the industry gap","authors":"W. H. Choo, M. Kawasaki, F. Kung","doi":"10.1109/RFM.2008.4897394","DOIUrl":"https://doi.org/10.1109/RFM.2008.4897394","url":null,"abstract":"The demand for industry-ready RF engineering graduates is increasing in tandem with the growth in wireless industries, and reduction in product time-to-market, creating an acute shortage of RF engineers world-wide. The complexities of RF theories, lack of exposure to relevant industry tools and missing domain knowledge in various functions within the industry further aggravates the situation. This paper outlines key aspects of developing a comprehensive teaching solution for RF engineers that closes this gap and benefits universities and industry. Critical job functions, skill sets, domain knowledge and engineering concepts are mapped systematically, resulting in a comprehensive solution encompassing teaching slide sets, a training kit, industry-standard measurement equipment, RF design software, test automation software, a course quality management template, problem-based assignments and train-the-trainer program.","PeriodicalId":329128,"journal":{"name":"2008 IEEE International RF and Microwave Conference","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131756442","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 : 2008-12-01DOI: 10.1109/RFM.2008.4897381
A. D. Usman, W. F. Wan Ahmad
Rapid development in the field of telecommunication industries and the lagging phase to which the exposure assessment results, calls for immediate intervention by scientist and engineers. In order to respond to public outcry, who are daily exposed to various sort of electromagnetic field radiations, a critical look on the electromagnetic field exposure guidelines and assessment of its effectiveness revealed that the guidelines are conservatives and are based only on short-term immediate health effects. In order to accommodate for the unforeseen, a lower limit of 1 w/kg instead of 4 w/kg of the SAR is recommended with a safety margin of 100 for occupational and 10 for the general public. Possible solutions to the gap identified were also provided.
{"title":"RF EM exposure: The issues, the debate and the realities","authors":"A. D. Usman, W. F. Wan Ahmad","doi":"10.1109/RFM.2008.4897381","DOIUrl":"https://doi.org/10.1109/RFM.2008.4897381","url":null,"abstract":"Rapid development in the field of telecommunication industries and the lagging phase to which the exposure assessment results, calls for immediate intervention by scientist and engineers. In order to respond to public outcry, who are daily exposed to various sort of electromagnetic field radiations, a critical look on the electromagnetic field exposure guidelines and assessment of its effectiveness revealed that the guidelines are conservatives and are based only on short-term immediate health effects. In order to accommodate for the unforeseen, a lower limit of 1 w/kg instead of 4 w/kg of the SAR is recommended with a safety margin of 100 for occupational and 10 for the general public. Possible solutions to the gap identified were also provided.","PeriodicalId":329128,"journal":{"name":"2008 IEEE International RF and Microwave Conference","volume":"136 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121252248","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 : 2008-12-01DOI: 10.1109/RFM.2008.4897364
M. Badri, A. Halim
This paper presents a design of moving message LCD display system (MMDS) via short message service (SMS) entry using Rabbit 2000 microcontroller. The objectives of the project are to design and integrate the hardware and software that interface the RCM2000 microcontroller, GSM module and LCD module in order to create MMDS. Currently, the moving text message display modules are using wired entry via computer, keyboard or remote control entry .However, this system receives message through Short Message Service (SMS). It will check the authorization of the phone number and the microcontroller will convert the message that will be display into LCD format. GSM modules and a SIM have been used in order to hook it up to the GSM network. Both hardware and software of the developed prototype are fully functioning and the tests have been successful. In conclusion, the MMDS system can replace the conventional entry methods.
{"title":"Design of moving massage LCD display system (MMDS) via Short Message Service (SMS) entry using Rabbit 2000 microcontroller","authors":"M. Badri, A. Halim","doi":"10.1109/RFM.2008.4897364","DOIUrl":"https://doi.org/10.1109/RFM.2008.4897364","url":null,"abstract":"This paper presents a design of moving message LCD display system (MMDS) via short message service (SMS) entry using Rabbit 2000 microcontroller. The objectives of the project are to design and integrate the hardware and software that interface the RCM2000 microcontroller, GSM module and LCD module in order to create MMDS. Currently, the moving text message display modules are using wired entry via computer, keyboard or remote control entry .However, this system receives message through Short Message Service (SMS). It will check the authorization of the phone number and the microcontroller will convert the message that will be display into LCD format. GSM modules and a SIM have been used in order to hook it up to the GSM network. Both hardware and software of the developed prototype are fully functioning and the tests have been successful. In conclusion, the MMDS system can replace the conventional entry methods.","PeriodicalId":329128,"journal":{"name":"2008 IEEE International RF and Microwave Conference","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125041234","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 : 2008-12-01DOI: 10.1109/RFM.2008.4897401
A. A. Sulaiman, M. F. Ain, S. Hassan, A. Othman, M. A. Othman, R. Majid, M.Z. Saidin, M. Hamid, M. H. Jusoh, Z. I. Khan, N. Baba, R. A. Awang, Z. Awang, N. Zakaria, M. Mahmood
This paper presents Chebyshev three and four poles microstrip hairpin filter for radar applications. The filters are operated at K-band frequency segment of 20-20.3 GHz. The filters were designed using Genesys software and implemented on Roger 5870 substrate. The results from simulation and measurement show that both filters were operating at the desired specification. Based on the experimental analysis, it was observed that the filter with four elements better than the three which was quite agree to other researchers.
{"title":"Design of hairpin band pass filters for K-Band application","authors":"A. A. Sulaiman, M. F. Ain, S. Hassan, A. Othman, M. A. Othman, R. Majid, M.Z. Saidin, M. Hamid, M. H. Jusoh, Z. I. Khan, N. Baba, R. A. Awang, Z. Awang, N. Zakaria, M. Mahmood","doi":"10.1109/RFM.2008.4897401","DOIUrl":"https://doi.org/10.1109/RFM.2008.4897401","url":null,"abstract":"This paper presents Chebyshev three and four poles microstrip hairpin filter for radar applications. The filters are operated at K-band frequency segment of 20-20.3 GHz. The filters were designed using Genesys software and implemented on Roger 5870 substrate. The results from simulation and measurement show that both filters were operating at the desired specification. Based on the experimental analysis, it was observed that the filter with four elements better than the three which was quite agree to other researchers.","PeriodicalId":329128,"journal":{"name":"2008 IEEE International RF and Microwave Conference","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131810387","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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