Hassan Ammor - Academia.edu (original) (raw)
Papers by Hassan Ammor
Lecture Notes in Electrical Engineering
Worldwide, cancer remains a scary topic that cause many deaths in recent years such as breast can... more Worldwide, cancer remains a scary topic that cause many deaths in recent years such as breast cancer, which affects many women in many ways. UWB antennas play an important role in early detection. The design of UWB antennas for biomedical applications presents a promising challenge and requires more research to improve health care system. This paper proposes an UWB antenna printed on a flexible substrate with thickness of 0.254 mm and relative permittivity εr = 2.2, operating in the range of 3.64-12.11 GHz. For its realization, we applied some techniques of miniaturization to improve some antenna characteristics. In addition, the effects of the curvature and the biological tissues on the return loss and radiation pattern were investigated.
Proceedings of the Third International Conference on Computing and Wireless Communication Systems, ICCWCS 2019, April 24-25, 2019, Faculty of Sciences, Ibn Tofaïl University -Kénitra- Morocco, 2019
The present invention relates to a miniature original tetra-generations patch antenna with rectan... more The present invention relates to a miniature original tetra-generations patch antenna with rectangular slots at low cost, and dedicated to the new generation of mobile telephony by covering the frequency bands of 900MHz, 1800MHz, 2100MHz and 2600MHz. The Modeling and simulation of the basic model are performed using the Ansoft HFSS simulator employing finite element method (FEM). This study allowed us to determine the reflection coefficient, the voltage standing wave ratio (VSWR), the omnidirectional radiation and the bandwidth. With this antenna, we obtained new results from the GSM thermal effect on the human head and hand. With this in mind, a new, simple and miniaturized quadri-band antenna in patch technology meeting the standards of dosimetry and temperature for mobile phone applications is designed and proposed.
La presente invention concerne une antenne micro-ruban quadribande imprimee originale miniature d... more La presente invention concerne une antenne micro-ruban quadribande imprimee originale miniature de forme carree avec des fentes rectangulaires a faible cout, et dediee a la nouvelle generation de la telephonie mobile en couvrant les bandes de frequences 900MHz, 1800MHz, 2100MHz et 2600MHz. La modelisation et la simulation du modele de base sont effectuees avec la methode des elements finis. Cette etude nous permettra de determiner le coefficient de reflexion, le taux d’onde stationnaire (TOS), le rayonnement omnidirectionnel, le gain et la bande passante. Avec cette antenne, nous avons obtenu des nouveaux resultats de l’effet thermique de GSM sur la tete humaine. Dans cet objectif, une nouvelle antenne carree quadribande originale simple et miniaturisee en technologie microruban respectant les normes de la dosimetrie et la temperature destinee a des applications de la telephonie mobile est concue et proposee. Ce travail de recherche est depose comme brevet d’invention national en ...
2019 International Conference on Wireless Technologies, Embedded and Intelligent Systems (WITS), 2019
In this paper, a new 16-elements, Corporate-series Feed Rectangular Patch Antenna Array operated ... more In this paper, a new 16-elements, Corporate-series Feed Rectangular Patch Antenna Array operated at 28GHz, for 5G mobile wireless applications have been designed and simulated. The proposed array contains 16-elements excited by one port, through a Y-Junction power divider. The array has a wide bandwidth from 26.42 to 28.94GHz and a high gain of 17.1dB with a radiation efficiency of 92%. The simulations are based using both HFSS (High-Frequency Structure Simulator) and CST Microwave Studio Software.
2019 7th Mediterranean Congress of Telecommunications (CMT)
In this work, a new patch antenna array containing 16-elements, Parallel-series Feed operated at ... more In this work, a new patch antenna array containing 16-elements, Parallel-series Feed operated at millimeter waves, for 5G mobile wireless applications have been designed and realized. The proposed antenna contains 16-elements excited by one port, through a Y-Junction power divider. The array has a bandwidth of 27.5 to 28. 35GHz and a high gain of 17.5dBi.
In this letter, we introduce a multilayer microstrip patch antenna for ultrawideband communicatio... more In this letter, we introduce a multilayer microstrip patch antenna for ultrawideband communications. The structure of the antenna is nearly the same with the traditional microstrip patch antenna except the feeding method. By using T-probe and multilayer structure. The result shows that the impedance bandwidth (VSWR ≤ 2) of the proposed antenna is 6.40 GHz (5.12 GHz to 11.52 GHz), which is equivalent to 76.93%. The gain of the antenna is almost 6.5dB across the operating bandwidth.
Proceedings of the Third International Conference on Computing and Wireless Communication Systems, ICCWCS 2019, April 24-25, 2019, Faculty of Sciences, Ibn Tofaïl University -Kénitra- Morocco
The electromagnetic properties of ferrite filled polymer nano-composites can be determined by a c... more The electromagnetic properties of ferrite filled polymer nano-composites can be determined by a classical Nicolson-Ross and Weir technique. The measurement of Sparameters makes it possible to calculate the complex permittivity ε and permeability µ of the Lanthanum Iron Garnet (LIG)-loaded polyvinylidene fluoride (PVDF)-polymer nanocomposites over the X-band waveguide. The reflection S 11 and transmission S 21 coefficients were calculated by the transmission/reflection rectangular waveguide technique. The LIG/PVDF sample, placed in the rectangular waveguide over X-band frequencies. The average values of the relative complex permittivity and permeability of LIG/PVDF over X-band frequencies [8-12 GHz] are (4.34-j0.09) and (1.27-j0.15) respectively.
2019 7th Mediterranean Congress of Telecommunications (CMT), 2019
Microwave imaging is the most attractive diagnostic technique for medical imaging interested by d... more Microwave imaging is the most attractive diagnostic technique for medical imaging interested by different scientific research teams. This paper proposes an algorithm namely Confocal Microwave Imaging (CMI) for detecting and locating a tumor by analyzing different electromagnetic signals. Firstly, an UWB antenna is designed and optimized to obtain a good impedance match over the required frequency range (3.1 GHz to 14 GHz) according to the FCC. Finally, the confocal microwave imaging (CMI) algorithm has been implemented and applied to create an image of tumor. The results obtained proved the feasibility of detecting breast tumors using CMI method.
Nous proposons un dispositif anti-triche qui epargne aux surveillants et candidats la pollution e... more Nous proposons un dispositif anti-triche qui epargne aux surveillants et candidats la pollution electromagnetique due aux brouilleurs GSM et sans provoquer aucune coupure de la telecommunication. Notre dispositif propose part du principe de miniaturisation d’une BTS Microcell afin de l'incorporer dans un drone en mouvement. Les identifiants IMSI collectes seront communiques en temps reel aux autorites competentes (ANRT, ENSSUP, Operateurs de Telecommunications) pour la duree exigee des epreuves.
In this paper, we propose the design of and provide an analysis of, a rectangular patch antenna a... more In this paper, we propose the design of and provide an analysis of, a rectangular patch antenna and its integration in a 4 element linear array. A T form power divider feeds in parallel the array elements through microstrip lines. The basic antenna has a simple structure, with dimensions of about 16´18´1.6 mm 3 , leading to a good bandwidth. In addition, the patch element characteristics, such as the reflection coefficient and the voltage standing wave ratio (VSWR), are improved by the insertion of a slot in the structure. The main objective of the 4 element array structure is the enhancement of the gain, which is enhanced up to 12.6 dBi. A prototype of the antenna is fabricated and tested with network analyzer. The proposed antenna has 4 resonant frequencies that define 4 bandwidths, defined by a return loss of less than -10 dB, and are: (7.62 GHz, 1250 MHz), (9.20 GHz, 330 MHz), (11.07 GHz, 940 MHz) and (15.02 GHz, 920 MHz), respectively. The simple configuration of this profile p...
This paper presents a simple waveguide measurement technique to determine the complex permittivit... more This paper presents a simple waveguide measurement technique to determine the complex permittivity and complex permeability of a dielectric material. The dielectric sample is loaded in the transmission line rectangular waveguide WR90. The S-parameters of the waveguide are measured by Network analyzer and calculated as a function of the complex permittivity and complex permeability using theory of transmissions lines. Using the MatLab Optimization Tools, a simple MatLab scripts is written to look for complex permittivity and complex permeability of a dielectric material so as to match the measured and calculated values of S-parameters. The complex permittivity and complex permeability of Teflon, Nylon and Delrin at the X-band frequencies are then determined.
This article presents the design of a miniaturized microstrip antenna for microwave medical imagi... more This article presents the design of a miniaturized microstrip antenna for microwave medical imaging applications. We propose a miniature rectangular printed antenna that meets the UWB characteristics in terms of bandwidth and reflection coefficient. This antenna is designed for a system to detect malignant tumors by microwave imaging. We use certain techniques of miniaturization and expansion of bandwidth in order to achieve our intention. The antenna has an ordinary rectangular radiating patch, therefore displays a good omnidirectional radiation pattern. The proposed antenna exhibits good UWB characteristics and has the capability of operating from 2.68GHz to 12.06GHz.
A new engineering approach for measuring dielectric properties of materials at K-Band frequencies... more A new engineering approach for measuring dielectric properties of materials at K-Band frequencies is developed. The proposed approach is based on applying the rectangular waveguide measurements. The material sample under test (MSUT) is loaded into the K-band rectangular waveguide WR42. The present method is comprised of two parts. The first one concerns the extraction of Scattering Parameters using Ansoft HFSS Solver, and then calculates them as a function of the complex permittivity adopting transmission matrices (direct problem). The square sums of errors between the simulated and calculated S-parameters are minimized using a nonlinear optimization algorithm. The second part aims to extract the complex relative permittivity from the simulated S-parameters (inverse problem). An innovative algorithm is developed to look for complex relative permittivity. A comparative study is elaborated; the Nicholson Ross method (NRM) is used to determine the complex relative permittivity of the t...
A miniaturized microstrip antenna that meets the requirements of UWB systems in terms of bandwidt... more A miniaturized microstrip antenna that meets the requirements of UWB systems in terms of bandwidth and reflection coefficient is presented in this paper. This antenna is designed for a system to detect malignant tumors by microwave imaging. We use certain miniaturization techniques of slots and partial ground plane for expansion of bandwidth in order to achieve our intention. The proposed antenna exhibits good UWB characteristics and has the capability of operating from 2.85GHz to 13.21GHz. The antenna has an ordinary rectangular radiating patch, therefore displays a good omnidirectional radiation pattern. The detailed design and the results are shown and discussed in this paper.
This paper presents the design of an ultra-wideband Circular microstrip patch antenna for (UWB) c... more This paper presents the design of an ultra-wideband Circular microstrip patch antenna for (UWB) communications. In this structure there is a small Circular patch consists of a partial ground plane and fed by a 50 Ω microstrip line. The proposed antenna can achieves a wide bandwidth from 2.72 GHz to 12.17 GHz with VSWR < 2 with stable and bi-directional radiation pattern. The simulation of this antenna has been performed by using Ansoft High Frequency Structure Simulator (HFSS) and Computer Simulation Technology- Microwave Studio (CST).
In this work, we study the performance of an antenna in microstrip technology designed especially... more In this work, we study the performance of an antenna in microstrip technology designed especially for micro-cellular applications in a real context of mobile radio-telephony. To accomplish this, we designed an indoor cellular test network and implemented basic functions of the GSM protocol, by using Open Base Transceiver Station (OpenBTS): an open-source cellular infrastructure that uses Software Defined Radio (SDR) as a platform. Our proposed prototype is based on the Universal Software Radio Peripheral (USRP) device from National Instrument that is designed to operate in the sub-6 GHz band. Finally, a preliminary test of the Quality of Service (QoS) has been quarried-out by measuring the Receive Signal Strength Indicator (RSSI) between the deployed Base Station and the connected mobile stations (MS), and that for different scenarios and distances.
Cette communication presente un reseau Ultra Large Bande de deux antennes a microbande elliptique... more Cette communication presente un reseau Ultra Large Bande de deux antennes a microbande elliptique proposee pour les applications satellitaires a bande Ku. L'antenne proposee a une structure simple, de petite taille avec des dimensions d'environ 11 × 12 × 1,58 mm³. L'antenne a ete concue et simulee sur un substrat FR4 avec une permittivite relative de 4,4 et une epaisseur de 1,58 mm. Les resultats des donnees mesurees montrent que l'antenne a une bande passante de 2.31GHz allant de 13.20 GHz jusqu’au 15.51 GHz avec une frequence de resonance de 15.09 GHz de perte -29.168 dB. L'antenne proposee peut etre utilisee dans de nombreuses applications telles que les communications par satellite, mobile par satellite et d’autres applications sans fil par satellite.
Indonesian Journal of Electrical Engineering and Informatics (IJEEI)
Breast cancer affects many women in many ways. Early diagnosis is the most important key for dete... more Breast cancer affects many women in many ways. Early diagnosis is the most important key for detecting malignant tissue. In this paper, we present the design of a microstrip patch antenna for ultra wide band (UWB) biomedical applications covering the full range of FCC frequencies (3.1 GHz to 14 GHz). We have used a single antenna with various positions to scan the whole breast phantom. A confocal microwave imaging (CMI) algorithm has been implemented and applied to create a 2D image of the tumor. The results obtained suggest the feasibility of using CMI method for detecting small breast tumors with high precision and more safety.
Indonesian Journal of Electrical Engineering and Informatics (IJEEI)
In this paper a new design of a dual small band small elliptical microstrip antenna is proposed f... more In this paper a new design of a dual small band small elliptical microstrip antenna is proposed for Ku and K band satellite applications. The basic antenna structure is an elliptical patch with inset-feed, which is modified by adding two rectangular slots in the radiation patch. The proposed antenna has been designed and fabricated on 1.58 mm thick FR4 substrate whose dielectric constant is 4.4, with dimensions of about 10×12×1.58 mm³. The antenna structure was validated using two different electromagnetic solvers and by measuring the results using a Vector Network Analyzer (VNA). The measured and simulated results show two resonant frequencies that define two bandwidths. Moreover, the proposed antenna frequency bands and the consistent and symmetrical radiation patterns make it an appropriate candidate for many applications such as the Ku/K band satellite application and wireless communications.
Lecture Notes in Electrical Engineering
Worldwide, cancer remains a scary topic that cause many deaths in recent years such as breast can... more Worldwide, cancer remains a scary topic that cause many deaths in recent years such as breast cancer, which affects many women in many ways. UWB antennas play an important role in early detection. The design of UWB antennas for biomedical applications presents a promising challenge and requires more research to improve health care system. This paper proposes an UWB antenna printed on a flexible substrate with thickness of 0.254 mm and relative permittivity εr = 2.2, operating in the range of 3.64-12.11 GHz. For its realization, we applied some techniques of miniaturization to improve some antenna characteristics. In addition, the effects of the curvature and the biological tissues on the return loss and radiation pattern were investigated.
Proceedings of the Third International Conference on Computing and Wireless Communication Systems, ICCWCS 2019, April 24-25, 2019, Faculty of Sciences, Ibn Tofaïl University -Kénitra- Morocco, 2019
The present invention relates to a miniature original tetra-generations patch antenna with rectan... more The present invention relates to a miniature original tetra-generations patch antenna with rectangular slots at low cost, and dedicated to the new generation of mobile telephony by covering the frequency bands of 900MHz, 1800MHz, 2100MHz and 2600MHz. The Modeling and simulation of the basic model are performed using the Ansoft HFSS simulator employing finite element method (FEM). This study allowed us to determine the reflection coefficient, the voltage standing wave ratio (VSWR), the omnidirectional radiation and the bandwidth. With this antenna, we obtained new results from the GSM thermal effect on the human head and hand. With this in mind, a new, simple and miniaturized quadri-band antenna in patch technology meeting the standards of dosimetry and temperature for mobile phone applications is designed and proposed.
La presente invention concerne une antenne micro-ruban quadribande imprimee originale miniature d... more La presente invention concerne une antenne micro-ruban quadribande imprimee originale miniature de forme carree avec des fentes rectangulaires a faible cout, et dediee a la nouvelle generation de la telephonie mobile en couvrant les bandes de frequences 900MHz, 1800MHz, 2100MHz et 2600MHz. La modelisation et la simulation du modele de base sont effectuees avec la methode des elements finis. Cette etude nous permettra de determiner le coefficient de reflexion, le taux d’onde stationnaire (TOS), le rayonnement omnidirectionnel, le gain et la bande passante. Avec cette antenne, nous avons obtenu des nouveaux resultats de l’effet thermique de GSM sur la tete humaine. Dans cet objectif, une nouvelle antenne carree quadribande originale simple et miniaturisee en technologie microruban respectant les normes de la dosimetrie et la temperature destinee a des applications de la telephonie mobile est concue et proposee. Ce travail de recherche est depose comme brevet d’invention national en ...
2019 International Conference on Wireless Technologies, Embedded and Intelligent Systems (WITS), 2019
In this paper, a new 16-elements, Corporate-series Feed Rectangular Patch Antenna Array operated ... more In this paper, a new 16-elements, Corporate-series Feed Rectangular Patch Antenna Array operated at 28GHz, for 5G mobile wireless applications have been designed and simulated. The proposed array contains 16-elements excited by one port, through a Y-Junction power divider. The array has a wide bandwidth from 26.42 to 28.94GHz and a high gain of 17.1dB with a radiation efficiency of 92%. The simulations are based using both HFSS (High-Frequency Structure Simulator) and CST Microwave Studio Software.
2019 7th Mediterranean Congress of Telecommunications (CMT)
In this work, a new patch antenna array containing 16-elements, Parallel-series Feed operated at ... more In this work, a new patch antenna array containing 16-elements, Parallel-series Feed operated at millimeter waves, for 5G mobile wireless applications have been designed and realized. The proposed antenna contains 16-elements excited by one port, through a Y-Junction power divider. The array has a bandwidth of 27.5 to 28. 35GHz and a high gain of 17.5dBi.
In this letter, we introduce a multilayer microstrip patch antenna for ultrawideband communicatio... more In this letter, we introduce a multilayer microstrip patch antenna for ultrawideband communications. The structure of the antenna is nearly the same with the traditional microstrip patch antenna except the feeding method. By using T-probe and multilayer structure. The result shows that the impedance bandwidth (VSWR ≤ 2) of the proposed antenna is 6.40 GHz (5.12 GHz to 11.52 GHz), which is equivalent to 76.93%. The gain of the antenna is almost 6.5dB across the operating bandwidth.
Proceedings of the Third International Conference on Computing and Wireless Communication Systems, ICCWCS 2019, April 24-25, 2019, Faculty of Sciences, Ibn Tofaïl University -Kénitra- Morocco
The electromagnetic properties of ferrite filled polymer nano-composites can be determined by a c... more The electromagnetic properties of ferrite filled polymer nano-composites can be determined by a classical Nicolson-Ross and Weir technique. The measurement of Sparameters makes it possible to calculate the complex permittivity ε and permeability µ of the Lanthanum Iron Garnet (LIG)-loaded polyvinylidene fluoride (PVDF)-polymer nanocomposites over the X-band waveguide. The reflection S 11 and transmission S 21 coefficients were calculated by the transmission/reflection rectangular waveguide technique. The LIG/PVDF sample, placed in the rectangular waveguide over X-band frequencies. The average values of the relative complex permittivity and permeability of LIG/PVDF over X-band frequencies [8-12 GHz] are (4.34-j0.09) and (1.27-j0.15) respectively.
2019 7th Mediterranean Congress of Telecommunications (CMT), 2019
Microwave imaging is the most attractive diagnostic technique for medical imaging interested by d... more Microwave imaging is the most attractive diagnostic technique for medical imaging interested by different scientific research teams. This paper proposes an algorithm namely Confocal Microwave Imaging (CMI) for detecting and locating a tumor by analyzing different electromagnetic signals. Firstly, an UWB antenna is designed and optimized to obtain a good impedance match over the required frequency range (3.1 GHz to 14 GHz) according to the FCC. Finally, the confocal microwave imaging (CMI) algorithm has been implemented and applied to create an image of tumor. The results obtained proved the feasibility of detecting breast tumors using CMI method.
Nous proposons un dispositif anti-triche qui epargne aux surveillants et candidats la pollution e... more Nous proposons un dispositif anti-triche qui epargne aux surveillants et candidats la pollution electromagnetique due aux brouilleurs GSM et sans provoquer aucune coupure de la telecommunication. Notre dispositif propose part du principe de miniaturisation d’une BTS Microcell afin de l'incorporer dans un drone en mouvement. Les identifiants IMSI collectes seront communiques en temps reel aux autorites competentes (ANRT, ENSSUP, Operateurs de Telecommunications) pour la duree exigee des epreuves.
In this paper, we propose the design of and provide an analysis of, a rectangular patch antenna a... more In this paper, we propose the design of and provide an analysis of, a rectangular patch antenna and its integration in a 4 element linear array. A T form power divider feeds in parallel the array elements through microstrip lines. The basic antenna has a simple structure, with dimensions of about 16´18´1.6 mm 3 , leading to a good bandwidth. In addition, the patch element characteristics, such as the reflection coefficient and the voltage standing wave ratio (VSWR), are improved by the insertion of a slot in the structure. The main objective of the 4 element array structure is the enhancement of the gain, which is enhanced up to 12.6 dBi. A prototype of the antenna is fabricated and tested with network analyzer. The proposed antenna has 4 resonant frequencies that define 4 bandwidths, defined by a return loss of less than -10 dB, and are: (7.62 GHz, 1250 MHz), (9.20 GHz, 330 MHz), (11.07 GHz, 940 MHz) and (15.02 GHz, 920 MHz), respectively. The simple configuration of this profile p...
This paper presents a simple waveguide measurement technique to determine the complex permittivit... more This paper presents a simple waveguide measurement technique to determine the complex permittivity and complex permeability of a dielectric material. The dielectric sample is loaded in the transmission line rectangular waveguide WR90. The S-parameters of the waveguide are measured by Network analyzer and calculated as a function of the complex permittivity and complex permeability using theory of transmissions lines. Using the MatLab Optimization Tools, a simple MatLab scripts is written to look for complex permittivity and complex permeability of a dielectric material so as to match the measured and calculated values of S-parameters. The complex permittivity and complex permeability of Teflon, Nylon and Delrin at the X-band frequencies are then determined.
This article presents the design of a miniaturized microstrip antenna for microwave medical imagi... more This article presents the design of a miniaturized microstrip antenna for microwave medical imaging applications. We propose a miniature rectangular printed antenna that meets the UWB characteristics in terms of bandwidth and reflection coefficient. This antenna is designed for a system to detect malignant tumors by microwave imaging. We use certain techniques of miniaturization and expansion of bandwidth in order to achieve our intention. The antenna has an ordinary rectangular radiating patch, therefore displays a good omnidirectional radiation pattern. The proposed antenna exhibits good UWB characteristics and has the capability of operating from 2.68GHz to 12.06GHz.
A new engineering approach for measuring dielectric properties of materials at K-Band frequencies... more A new engineering approach for measuring dielectric properties of materials at K-Band frequencies is developed. The proposed approach is based on applying the rectangular waveguide measurements. The material sample under test (MSUT) is loaded into the K-band rectangular waveguide WR42. The present method is comprised of two parts. The first one concerns the extraction of Scattering Parameters using Ansoft HFSS Solver, and then calculates them as a function of the complex permittivity adopting transmission matrices (direct problem). The square sums of errors between the simulated and calculated S-parameters are minimized using a nonlinear optimization algorithm. The second part aims to extract the complex relative permittivity from the simulated S-parameters (inverse problem). An innovative algorithm is developed to look for complex relative permittivity. A comparative study is elaborated; the Nicholson Ross method (NRM) is used to determine the complex relative permittivity of the t...
A miniaturized microstrip antenna that meets the requirements of UWB systems in terms of bandwidt... more A miniaturized microstrip antenna that meets the requirements of UWB systems in terms of bandwidth and reflection coefficient is presented in this paper. This antenna is designed for a system to detect malignant tumors by microwave imaging. We use certain miniaturization techniques of slots and partial ground plane for expansion of bandwidth in order to achieve our intention. The proposed antenna exhibits good UWB characteristics and has the capability of operating from 2.85GHz to 13.21GHz. The antenna has an ordinary rectangular radiating patch, therefore displays a good omnidirectional radiation pattern. The detailed design and the results are shown and discussed in this paper.
This paper presents the design of an ultra-wideband Circular microstrip patch antenna for (UWB) c... more This paper presents the design of an ultra-wideband Circular microstrip patch antenna for (UWB) communications. In this structure there is a small Circular patch consists of a partial ground plane and fed by a 50 Ω microstrip line. The proposed antenna can achieves a wide bandwidth from 2.72 GHz to 12.17 GHz with VSWR < 2 with stable and bi-directional radiation pattern. The simulation of this antenna has been performed by using Ansoft High Frequency Structure Simulator (HFSS) and Computer Simulation Technology- Microwave Studio (CST).
In this work, we study the performance of an antenna in microstrip technology designed especially... more In this work, we study the performance of an antenna in microstrip technology designed especially for micro-cellular applications in a real context of mobile radio-telephony. To accomplish this, we designed an indoor cellular test network and implemented basic functions of the GSM protocol, by using Open Base Transceiver Station (OpenBTS): an open-source cellular infrastructure that uses Software Defined Radio (SDR) as a platform. Our proposed prototype is based on the Universal Software Radio Peripheral (USRP) device from National Instrument that is designed to operate in the sub-6 GHz band. Finally, a preliminary test of the Quality of Service (QoS) has been quarried-out by measuring the Receive Signal Strength Indicator (RSSI) between the deployed Base Station and the connected mobile stations (MS), and that for different scenarios and distances.
Cette communication presente un reseau Ultra Large Bande de deux antennes a microbande elliptique... more Cette communication presente un reseau Ultra Large Bande de deux antennes a microbande elliptique proposee pour les applications satellitaires a bande Ku. L'antenne proposee a une structure simple, de petite taille avec des dimensions d'environ 11 × 12 × 1,58 mm³. L'antenne a ete concue et simulee sur un substrat FR4 avec une permittivite relative de 4,4 et une epaisseur de 1,58 mm. Les resultats des donnees mesurees montrent que l'antenne a une bande passante de 2.31GHz allant de 13.20 GHz jusqu’au 15.51 GHz avec une frequence de resonance de 15.09 GHz de perte -29.168 dB. L'antenne proposee peut etre utilisee dans de nombreuses applications telles que les communications par satellite, mobile par satellite et d’autres applications sans fil par satellite.
Indonesian Journal of Electrical Engineering and Informatics (IJEEI)
Breast cancer affects many women in many ways. Early diagnosis is the most important key for dete... more Breast cancer affects many women in many ways. Early diagnosis is the most important key for detecting malignant tissue. In this paper, we present the design of a microstrip patch antenna for ultra wide band (UWB) biomedical applications covering the full range of FCC frequencies (3.1 GHz to 14 GHz). We have used a single antenna with various positions to scan the whole breast phantom. A confocal microwave imaging (CMI) algorithm has been implemented and applied to create a 2D image of the tumor. The results obtained suggest the feasibility of using CMI method for detecting small breast tumors with high precision and more safety.
Indonesian Journal of Electrical Engineering and Informatics (IJEEI)
In this paper a new design of a dual small band small elliptical microstrip antenna is proposed f... more In this paper a new design of a dual small band small elliptical microstrip antenna is proposed for Ku and K band satellite applications. The basic antenna structure is an elliptical patch with inset-feed, which is modified by adding two rectangular slots in the radiation patch. The proposed antenna has been designed and fabricated on 1.58 mm thick FR4 substrate whose dielectric constant is 4.4, with dimensions of about 10×12×1.58 mm³. The antenna structure was validated using two different electromagnetic solvers and by measuring the results using a Vector Network Analyzer (VNA). The measured and simulated results show two resonant frequencies that define two bandwidths. Moreover, the proposed antenna frequency bands and the consistent and symmetrical radiation patterns make it an appropriate candidate for many applications such as the Ku/K band satellite application and wireless communications.