Pub Date : 2008-12-04DOI: 10.1109/RFM.2008.4897461
M. Aras, M. Rahim, A. Asrokin, M. Aziz
This paper describes a simple design on dielectric resonator antenna using disk shape. The dielectric resonator antenna (DRA) consists of high dielectric constant materials, high quality factors and mounted on a grounded dielectric substrate of lower permittivity. The selected dielectric disk is operating at frequency of 2.4 GHz with dielectric constant of 34.73. The miscrostrip transmission line has been used as a feeding line for the resonator. The simulation process was done using Computer Simulation Technology (CST) Microwave Studio and Microwave office. The antenna has been fabricated on the FR-4 microstrip board using the wet etching technique. The DRA is operating at the frequency bands used for IEEE 802.11 b/g wireless LANs. The performance between simulation and measurement give a very good approximation result.
{"title":"Dielectric resonator antenna (DRA) for wireless application","authors":"M. Aras, M. Rahim, A. Asrokin, M. Aziz","doi":"10.1109/RFM.2008.4897461","DOIUrl":"https://doi.org/10.1109/RFM.2008.4897461","url":null,"abstract":"This paper describes a simple design on dielectric resonator antenna using disk shape. The dielectric resonator antenna (DRA) consists of high dielectric constant materials, high quality factors and mounted on a grounded dielectric substrate of lower permittivity. The selected dielectric disk is operating at frequency of 2.4 GHz with dielectric constant of 34.73. The miscrostrip transmission line has been used as a feeding line for the resonator. The simulation process was done using Computer Simulation Technology (CST) Microwave Studio and Microwave office. The antenna has been fabricated on the FR-4 microstrip board using the wet etching technique. The DRA is operating at the frequency bands used for IEEE 802.11 b/g wireless LANs. The performance between simulation and measurement give a very good approximation result.","PeriodicalId":329128,"journal":{"name":"2008 IEEE International RF and Microwave Conference","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123302772","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 : 2008-12-02DOI: 10.1109/RFM.2008.4897412
C.L. Leow, P. Soh, S. Carpenter, A. Azremi, A. Ezanuddin
Microstrip stop-band filters based on complementary split ring resonators has been proposed in this project. Two shapes (circle and square) of SRRs have been investigated to come out device which is designed to suppress frequency 2.4-2.48 GHz (with a center frequency of 2.45 GHz) and the frequency spectrum between 5 - 6 GHz. The combinational design of each shape which is able to suppress is then fabricated in UniMAP fabrication lab and measured using Agilent PNA Series Network Analyzer and coaxial wire. Comparison of simulation and measurement results of circle SRRs is done and it is observed that good frequency selectivity is obtained around the design frequency 2.45 GHz and produce slightly deeper rejection at 5-6 GHz compare to simulation results. Both results show significant insertion loss (>30 dB).
{"title":"Design of split ring resonator filters for interference suppression in UWB","authors":"C.L. Leow, P. Soh, S. Carpenter, A. Azremi, A. Ezanuddin","doi":"10.1109/RFM.2008.4897412","DOIUrl":"https://doi.org/10.1109/RFM.2008.4897412","url":null,"abstract":"Microstrip stop-band filters based on complementary split ring resonators has been proposed in this project. Two shapes (circle and square) of SRRs have been investigated to come out device which is designed to suppress frequency 2.4-2.48 GHz (with a center frequency of 2.45 GHz) and the frequency spectrum between 5 - 6 GHz. The combinational design of each shape which is able to suppress is then fabricated in UniMAP fabrication lab and measured using Agilent PNA Series Network Analyzer and coaxial wire. Comparison of simulation and measurement results of circle SRRs is done and it is observed that good frequency selectivity is obtained around the design frequency 2.45 GHz and produce slightly deeper rejection at 5-6 GHz compare to simulation results. Both results show significant insertion loss (>30 dB).","PeriodicalId":329128,"journal":{"name":"2008 IEEE International RF and Microwave Conference","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116553419","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.2008.4897395
K. Low, M. Jafri, S. Khan
The object of this paper is to calculate the band gap energy of the newly designed waveguide structure. The structure used was 2 layers of perfect conductor (PEC) sandwiched with an electromagnetic band gap (EBG) or photonic crystals (PC) in the center. The lattice arrangement of the EBG was square lattice. The cylinder rods is made of PEC also and separated with each other at 1 mm. The size of the cylinder is 0.43 mm in radius. The cylinder rods were embedded in FR-4 which has dielectric constant 4.9. We designed the structure and simulate it in CST Microwave Studio (MWS). We performed a parametric phase sweep in eigenmode. The band energy was studied and analyzed.
{"title":"Band gap calculation for two layered perfect conductor (PEC) electromagnetic band gap structure in application of microstrip","authors":"K. Low, M. Jafri, S. Khan","doi":"10.1109/RFM.2008.4897395","DOIUrl":"https://doi.org/10.1109/RFM.2008.4897395","url":null,"abstract":"The object of this paper is to calculate the band gap energy of the newly designed waveguide structure. The structure used was 2 layers of perfect conductor (PEC) sandwiched with an electromagnetic band gap (EBG) or photonic crystals (PC) in the center. The lattice arrangement of the EBG was square lattice. The cylinder rods is made of PEC also and separated with each other at 1 mm. The size of the cylinder is 0.43 mm in radius. The cylinder rods were embedded in FR-4 which has dielectric constant 4.9. We designed the structure and simulate it in CST Microwave Studio (MWS). We performed a parametric phase sweep in eigenmode. The band energy was studied and analyzed.","PeriodicalId":329128,"journal":{"name":"2008 IEEE International RF and Microwave Conference","volume":"26 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":"127251899","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.2008.4897391
C. Y. Tan, K. Selvan
This paper compares the performance of metallic cone-sphere-inserted and plano-convex dielectric lens-corrected conical horns. The parameters considered in the study are gain, aperture efficiency, peak cross-polarization, radiation patterns and return loss. It emerges from the comparative study that, in an overall sense, the metallic cone-sphere-inserted conical horn outperforms the lens-corrected horn.
{"title":"Performance comparison of metallic cone-sphere-inserted and dielectric lens-corrected conical horns","authors":"C. Y. Tan, K. Selvan","doi":"10.1109/RFM.2008.4897391","DOIUrl":"https://doi.org/10.1109/RFM.2008.4897391","url":null,"abstract":"This paper compares the performance of metallic cone-sphere-inserted and plano-convex dielectric lens-corrected conical horns. The parameters considered in the study are gain, aperture efficiency, peak cross-polarization, radiation patterns and return loss. It emerges from the comparative study that, in an overall sense, the metallic cone-sphere-inserted conical horn outperforms the lens-corrected horn.","PeriodicalId":329128,"journal":{"name":"2008 IEEE International RF and Microwave Conference","volume":"44 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":"124809888","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.2008.4897459
M. Salleh, G. Prigent, R. Crampagne, P. Pons
Designs of three bandpass filters based on quarter wavelength side-coupled ring resonator are presented for V-band applications. Centered at around 60 GHz with three different bandwidths of 2.4%, 6.2% and 11.27%, the filters are designed on a 25-mum-thick benzocyclobutene (BCB) substrate deposited on a 400-mum-thick silicon bulk. In the filter designs, three technology configurations involving multilayer microstrip and coplanar waveguide (CPW) environment are considered to achieve flexibility in coupling. Results from electromagnetic simulations of the filters are presented through this paper.
{"title":"Quarter wavelength side-coupled ring filters for V-band applications","authors":"M. Salleh, G. Prigent, R. Crampagne, P. Pons","doi":"10.1109/RFM.2008.4897459","DOIUrl":"https://doi.org/10.1109/RFM.2008.4897459","url":null,"abstract":"Designs of three bandpass filters based on quarter wavelength side-coupled ring resonator are presented for V-band applications. Centered at around 60 GHz with three different bandwidths of 2.4%, 6.2% and 11.27%, the filters are designed on a 25-mum-thick benzocyclobutene (BCB) substrate deposited on a 400-mum-thick silicon bulk. In the filter designs, three technology configurations involving multilayer microstrip and coplanar waveguide (CPW) environment are considered to achieve flexibility in coupling. Results from electromagnetic simulations of the filters are presented through this paper.","PeriodicalId":329128,"journal":{"name":"2008 IEEE International RF and Microwave Conference","volume":"2004 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":"125805957","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.2008.4897424
H. Taha, M. Salleh
The increased in demand for high data rate in wireless communication systems paves the way for the development of broadband communication systems. A radio channel is plagued by multipath propagation, which causes frequency-selective fading in broadband signals. Orthogonal frequency-division multiplexing (OFDM) is a modulation scheme specifically designed to have high-speed data transmission as well as more robust over the frequency-selective fading channels. In this paper we discuss the impact of the number of qudarature amplitude modulation(QAM) modulation point over AWGN, flat fading as well as frequency selective fading channels.
{"title":"Performance of OFDM-FFT system in various wireless channels","authors":"H. Taha, M. Salleh","doi":"10.1109/RFM.2008.4897424","DOIUrl":"https://doi.org/10.1109/RFM.2008.4897424","url":null,"abstract":"The increased in demand for high data rate in wireless communication systems paves the way for the development of broadband communication systems. A radio channel is plagued by multipath propagation, which causes frequency-selective fading in broadband signals. Orthogonal frequency-division multiplexing (OFDM) is a modulation scheme specifically designed to have high-speed data transmission as well as more robust over the frequency-selective fading channels. In this paper we discuss the impact of the number of qudarature amplitude modulation(QAM) modulation point over AWGN, flat fading as well as frequency selective fading channels.","PeriodicalId":329128,"journal":{"name":"2008 IEEE International RF and Microwave Conference","volume":"59 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":"115070517","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.2008.4897386
A. Munawar, S. Adabi, A. Ismail, M. Saripan, R. Mahmood, W. Mahadi, R. Abdullah
This paper presents an initial investigation for breast cancer detection using a special mode of bistatic radar system known as forward scattering radar (FSR). The proposed method analyzes the Doppler frequency in the received signal scattered from the tumor for cancer detection and localization. Three systems of architectures were analyzed which determined by the mechanical movement of transmitter or receiver or both. This paper also discusses an initial simulated result by using CST Microwave Studio as a feasibility study of utilizing FSR for breast cancer detection. It is shown that by investigating the unique character of Radar Cross Section (RCS) for breast tissue and tumor of FSR a cancer can be predicted. Electromagnetic model including fatty tissue and a tumor were simulated to obtain RCS parameter and analyzed as well as compared with whose fatty tissue without cancerous lesion to pinpoint the presence of tumor from its FSR signature. The result shows a significant different between these two models in FS RCS.
{"title":"Breast cancer detection using Forward Scattering Radar technique","authors":"A. Munawar, S. Adabi, A. Ismail, M. Saripan, R. Mahmood, W. Mahadi, R. Abdullah","doi":"10.1109/RFM.2008.4897386","DOIUrl":"https://doi.org/10.1109/RFM.2008.4897386","url":null,"abstract":"This paper presents an initial investigation for breast cancer detection using a special mode of bistatic radar system known as forward scattering radar (FSR). The proposed method analyzes the Doppler frequency in the received signal scattered from the tumor for cancer detection and localization. Three systems of architectures were analyzed which determined by the mechanical movement of transmitter or receiver or both. This paper also discusses an initial simulated result by using CST Microwave Studio as a feasibility study of utilizing FSR for breast cancer detection. It is shown that by investigating the unique character of Radar Cross Section (RCS) for breast tissue and tumor of FSR a cancer can be predicted. Electromagnetic model including fatty tissue and a tumor were simulated to obtain RCS parameter and analyzed as well as compared with whose fatty tissue without cancerous lesion to pinpoint the presence of tumor from its FSR signature. The result shows a significant different between these two models in FS RCS.","PeriodicalId":329128,"journal":{"name":"2008 IEEE International RF and Microwave Conference","volume":"25 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":"116452542","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.2008.4897389
W. Muhamad, K. Dimyati, R. Mohamad, M. A. Haron, S. S. Sarnin, N. A. Wahab, N. Aziz
Wireless sensor networks (WSN) will enable the reliable monitoring of a variety environment for both civil and military applications. Routing protocols have significant impact on the overall energy dissipation of sensor networks. This project present the development of an energy efficient routing protocol which consumes significantly less power compared to existing routing protocol for wireless sensor network. The design was developed based on low energy adaptive clustering hierarchy (LEACH) routing protocol. Clustering is an energy efficient and scalable way to organize the WSN. The main objective is to minimize the energy dissipation of each sensor node and reduces the energy dissipation for the whole network. Stable cluster head election (SCHE) analyzes the cluster head selection to find the optimal probability of becoming a cluster head. Simulation of Matlab shows that this design reduces communication energy by as much as 95% compared to LEACH, due to stable cluster head election.
{"title":"Evaluation of Stable Cluster Head Election (SCHE) routing protocol for Wireless Sensor Networks","authors":"W. Muhamad, K. Dimyati, R. Mohamad, M. A. Haron, S. S. Sarnin, N. A. Wahab, N. Aziz","doi":"10.1109/RFM.2008.4897389","DOIUrl":"https://doi.org/10.1109/RFM.2008.4897389","url":null,"abstract":"Wireless sensor networks (WSN) will enable the reliable monitoring of a variety environment for both civil and military applications. Routing protocols have significant impact on the overall energy dissipation of sensor networks. This project present the development of an energy efficient routing protocol which consumes significantly less power compared to existing routing protocol for wireless sensor network. The design was developed based on low energy adaptive clustering hierarchy (LEACH) routing protocol. Clustering is an energy efficient and scalable way to organize the WSN. The main objective is to minimize the energy dissipation of each sensor node and reduces the energy dissipation for the whole network. Stable cluster head election (SCHE) analyzes the cluster head selection to find the optimal probability of becoming a cluster head. Simulation of Matlab shows that this design reduces communication energy by as much as 95% compared to LEACH, due to stable cluster head election.","PeriodicalId":329128,"journal":{"name":"2008 IEEE International RF and Microwave Conference","volume":"81 1 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":"124709799","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.2008.4897441
A. Khalid, S. M. Idrus, S. Alifah
Free-space optics (FSO) or Free-space photonics (FSP), is refers to the transmission of modulated visible or infrared (IR) beams through the atmosphere, which provides the wireless solution for the demand of high speed data rate and obtain broadband communications. The problem in implementing this technology is the performance reduction due to the nonlinearity present in the directly modulated optical transmitter, hence causes the inband, harmonic and intermodulation distortion in the modulated signal. The technique of feedforward distortion compensation is one of the better solution that prefers because, it can reduce the broadband distortion in modulated optical signal of wavelength 1550 nm which is suitable for wireless optical communication, also reduces all the other higher orders of distortion and the laser relative intensity noise (RIN) simultaneously. In this paper a novel design of the free space optical link non-linearity correction of the optical transmitter i.e. laser diode at frequency 5.2 GHz bandwidth used for IEEE802.11a standard and wavelength of 1550 nm employing the feedforward linearization technique is presented.
{"title":"The feedforward linearization system of optical transmitter for Free space optical (FSO) link","authors":"A. Khalid, S. M. Idrus, S. Alifah","doi":"10.1109/RFM.2008.4897441","DOIUrl":"https://doi.org/10.1109/RFM.2008.4897441","url":null,"abstract":"Free-space optics (FSO) or Free-space photonics (FSP), is refers to the transmission of modulated visible or infrared (IR) beams through the atmosphere, which provides the wireless solution for the demand of high speed data rate and obtain broadband communications. The problem in implementing this technology is the performance reduction due to the nonlinearity present in the directly modulated optical transmitter, hence causes the inband, harmonic and intermodulation distortion in the modulated signal. The technique of feedforward distortion compensation is one of the better solution that prefers because, it can reduce the broadband distortion in modulated optical signal of wavelength 1550 nm which is suitable for wireless optical communication, also reduces all the other higher orders of distortion and the laser relative intensity noise (RIN) simultaneously. In this paper a novel design of the free space optical link non-linearity correction of the optical transmitter i.e. laser diode at frequency 5.2 GHz bandwidth used for IEEE802.11a standard and wavelength of 1550 nm employing the feedforward linearization technique is presented.","PeriodicalId":329128,"journal":{"name":"2008 IEEE International RF and Microwave Conference","volume":"290 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":"123455528","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.2008.4897419
G. Moradi, A. Abdipour, A. Shabani
This paper describes the implementation of a hybrid attenuator which is made by combination of field effect transistors and PIN diodes. The performance of this structure can be better than the characteristics of classical PIN attenuators and those of FET attenuators. The developed circuit can be used as a key element in AGCs.
{"title":"Analysis and design of a FET-PIN-FET attenuator","authors":"G. Moradi, A. Abdipour, A. Shabani","doi":"10.1109/RFM.2008.4897419","DOIUrl":"https://doi.org/10.1109/RFM.2008.4897419","url":null,"abstract":"This paper describes the implementation of a hybrid attenuator which is made by combination of field effect transistors and PIN diodes. The performance of this structure can be better than the characteristics of classical PIN attenuators and those of FET attenuators. The developed circuit can be used as a key element in AGCs.","PeriodicalId":329128,"journal":{"name":"2008 IEEE International RF and Microwave Conference","volume":"56 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":"121455061","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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