2007 Asia-Pacific Conference on Applied Electromagnetics, 2007
Abstract This paper discussed the implimentation of the planar dipole antenna using Koch curve ... more Abstract This paper discussed the implimentation of the planar dipole antenna using Koch curve structure at UHF band application. The 2nd iteration of Koch curve is arrange in series to reduced the height of the antenna and the ground plane is optimized during simulation. ...
International Conference on Computer and Communication Engineering (ICCCE'10), 2010
Signal degradation in Mobile Satellite (MS) is due to several factors such as ionospheric effect,... more Signal degradation in Mobile Satellite (MS) is due to several factors such as ionospheric effect, multipath fading, tree-shadowed and building-shadowed. This affects the Mobile Satellite Service (MSS) to provide continuous communication service to the users. Since there is not adequate data available on the signal performance of the MS in the Asian continent, thus, an experimental work is essential to
Proceeding of the 2011 IEEE International Conference on Space Science and Communication (IconSpace), 2011
The effect of ionosphere on mobile satellite (MS) L-band signal which are propagated from the tra... more The effect of ionosphere on mobile satellite (MS) L-band signal which are propagated from the transmitting satellite to the receiver over the equatorial region has attracted much interest. Sarawak which is located near the equatorial region has been selected for the purpose of this research. By means of data acquisition system using the Global Positioning System (GPS) technology, data measurement and analysis has been carried out at the Universiti Malaysia Sarawak campus in early months of 2010. The results have been presented in the forms of received signal performance, fading characteristics and complementary cumulative distribution function of certain GPS satellites over the sky of Sarawak. A general mathematical model representing the signal strength for the open space environment in equatorial region has been developed. The availability of more satellite propagation data in different places of equatorial region will improve the MS model and quality of service perceived by MS users.
2009 IEEE International Workshop on Antenna Technology, 2009
The scope of this project was to design and simulate left-handed metamaterial structure incorpora... more The scope of this project was to design and simulate left-handed metamaterial structure incorporated with a single microstrip patch antenna at 2.7 GHz. The combination of the modified square rectangular split ring (SRR) and the capacitance loaded strip (CLS) was used to obtain the negative value of permeability, mu and the negative permittivity, epsiv. From the simulation and fabrication done,
2008 International Workshop on Antenna Technology: Small Antennas and Novel Metamaterials, 2008
ABSTRACT From this paper, the characteristic of the rectangular ring EBG structure has been prese... more ABSTRACT From this paper, the characteristic of the rectangular ring EBG structure has been presented. The band gap characteristic for EBG structure is depending on the gap between the elements and the different via location between elements in EBG structure. The operating frequency of this EBG structure can be used for ISM band application.
ABSTRACT Novel Minkowski gasket high impedance EBG structures, incorporated with vias for fractal... more ABSTRACT Novel Minkowski gasket high impedance EBG structures, incorporated with vias for fractal/multiband microstrip antennas that radiate multiband frequencies is proposed in this paper. This structures which possess multi band-gaps' characteristics, act as a means to suppress the surface waves effectively, at various multiple frequencies, thus improves the radiation pattern of the antenna. Models of these EBG structures have been developed and constructed on an inexpensive fire retardant-4 (FR4) board, using wet etching techniques. The parameters involved such as their shapes, width, length, the dielectric constant, the transmission line and via position and measurement technique was studied, analyzed numerically and experimentally in order to merge out with the optimum designs. The results gained were very encouraging.
This paper discusses the design and implementation of an active transmit-receive antenna, integra... more This paper discusses the design and implementation of an active transmit-receive antenna, integrating an active devices onto a printed antenna to improve its performance and combine functions within the antenna itself. It includes a circular polarized microstrip patch antenna, two amplifiers, a power divider and a rat race coupler to isolate transmit and receive paths. The beamwidth of the antenna is in the range of 600 to 700 for H plane. The radiation pattern for E plane is smaller compared to the H plane. The comparison between the passive and the active integrated antenna shows that the active integrated antenna has 3 dB extra gain compared to the passive antenna, for both transmit and receive. The isolation between transmit and receive is between 20 to 25 dB. This active antenna has potential uses in WLAN communication applications.
... T. Masri, MKARahim, O. Ayop Radio Communication Engineering Department (RaCED) Universiti Tek... more ... T. Masri, MKARahim, O. Ayop Radio Communication Engineering Department (RaCED) Universiti Teknologi Malaysia 81310, Skudai, Johor Bahru, Malaysia ithelaha ... This antenna is suitable for point-to-point and point to multi-point Dual-Band Wireless LAN applications that ...
In this paper, a modified slotted patch EBG structure has been investigated and followed by a dis... more In this paper, a modified slotted patch EBG structure has been investigated and followed by a discussion of the design and the evaluation of the structure. The result of the EBG structure in term of S21 is shown in simulation and measurement. The simulation process is being done using microwave office software 2006. The EBG structure is developed using inexpensive Fire Retardant-4 (FR4) board. The S21 result shows that the band gap of the structure is between 2.24 GHz and 2.6 GHz at -20 dB. The structure is then incorporated into a 2 by 2 antenna array operates at 2.4 GHz with a separation between X/2 and X. The result shows that the radiation pattern improved with reduced back lobe with an extra gain of 1 dB compared with the antenna without the EBG structure.
The design, simulation and fabrication of a left-handed metamaterial (LHM) structure is presented... more The design, simulation and fabrication of a left-handed metamaterial (LHM) structure is presented. The combination of the modified square rectangular Split Ring Resonator (SRR) and the Capacitance Loaded Strip (CLS) were used to obtain the negative value of permeability, µ and the negative permittivity, ε. Nicolson-Ross-Wier approach was used to identify the double negative region. A good agreement between simulated and measured results has been achieved. Upon incorporation with a single patch microstrip antenna, the performance of the antenna was improved where the gain of the microstrip antenna was increased up to 4 dB, and its bandwidth widens from 2.9% to 4.98%. These improvements are due to the negative refraction characteristics of the LHM structure that acts as a lens when placed in front of the antenna.
2008 IEEE International RF and Microwave Conference, 2008
... Osman Ayop, Mohamad Kamal A. Rahim and Thelaha Masri 1Department of Radio Communications, Fac... more ... Osman Ayop, Mohamad Kamal A. Rahim and Thelaha Masri 1Department of Radio Communications, Faculty of Electrical Engineering, Universiti Teknologi Malaysia, 81310 Skudai Johor Bahru. osman@fke.utm.my, mkamal@fke.utm.my, ithelaha@yahoo.com.my. ...
2007 Asia-Pacific Conference on Applied Electromagnetics, 2007
In this paper, a 3 by 3 dual band Electromagnetic Band Gap (EBG) structure has been designed to c... more In this paper, a 3 by 3 dual band Electromagnetic Band Gap (EBG) structure has been designed to cover the two frequency of unlicensed Band at 2.4 GHz and 5.2 GHz. The characteristic of the EBG structure is investigated by measuring the forward transmission coefficient, S 21 . The discussion of the design and the evaluation of the structure itself have been made. The simulation process was carried out using microwave office software. This structure has been designed using 1.6 mm Fire Retardant-4 (FR4) board which has relative permittivity of 4.9 and loss tangent of 0.019. The simulated result for S 21 shows the band gap frequencies measured are found to be between 2.037 GHz and 2.609 GHz with cover 2.4 GHz ISM band GHz and between 4.738 GHz and 5.492 GHz which cover 5.2 GHz UNI band.
2007 Asia-Pacific Conference on Applied Electromagnetics, 2007
Abstract This paper discussed the implimentation of the planar dipole antenna using Koch curve ... more Abstract This paper discussed the implimentation of the planar dipole antenna using Koch curve structure at UHF band application. The 2nd iteration of Koch curve is arrange in series to reduced the height of the antenna and the ground plane is optimized during simulation. ...
International Conference on Computer and Communication Engineering (ICCCE'10), 2010
Signal degradation in Mobile Satellite (MS) is due to several factors such as ionospheric effect,... more Signal degradation in Mobile Satellite (MS) is due to several factors such as ionospheric effect, multipath fading, tree-shadowed and building-shadowed. This affects the Mobile Satellite Service (MSS) to provide continuous communication service to the users. Since there is not adequate data available on the signal performance of the MS in the Asian continent, thus, an experimental work is essential to
Proceeding of the 2011 IEEE International Conference on Space Science and Communication (IconSpace), 2011
The effect of ionosphere on mobile satellite (MS) L-band signal which are propagated from the tra... more The effect of ionosphere on mobile satellite (MS) L-band signal which are propagated from the transmitting satellite to the receiver over the equatorial region has attracted much interest. Sarawak which is located near the equatorial region has been selected for the purpose of this research. By means of data acquisition system using the Global Positioning System (GPS) technology, data measurement and analysis has been carried out at the Universiti Malaysia Sarawak campus in early months of 2010. The results have been presented in the forms of received signal performance, fading characteristics and complementary cumulative distribution function of certain GPS satellites over the sky of Sarawak. A general mathematical model representing the signal strength for the open space environment in equatorial region has been developed. The availability of more satellite propagation data in different places of equatorial region will improve the MS model and quality of service perceived by MS users.
2009 IEEE International Workshop on Antenna Technology, 2009
The scope of this project was to design and simulate left-handed metamaterial structure incorpora... more The scope of this project was to design and simulate left-handed metamaterial structure incorporated with a single microstrip patch antenna at 2.7 GHz. The combination of the modified square rectangular split ring (SRR) and the capacitance loaded strip (CLS) was used to obtain the negative value of permeability, mu and the negative permittivity, epsiv. From the simulation and fabrication done,
2008 International Workshop on Antenna Technology: Small Antennas and Novel Metamaterials, 2008
ABSTRACT From this paper, the characteristic of the rectangular ring EBG structure has been prese... more ABSTRACT From this paper, the characteristic of the rectangular ring EBG structure has been presented. The band gap characteristic for EBG structure is depending on the gap between the elements and the different via location between elements in EBG structure. The operating frequency of this EBG structure can be used for ISM band application.
ABSTRACT Novel Minkowski gasket high impedance EBG structures, incorporated with vias for fractal... more ABSTRACT Novel Minkowski gasket high impedance EBG structures, incorporated with vias for fractal/multiband microstrip antennas that radiate multiband frequencies is proposed in this paper. This structures which possess multi band-gaps' characteristics, act as a means to suppress the surface waves effectively, at various multiple frequencies, thus improves the radiation pattern of the antenna. Models of these EBG structures have been developed and constructed on an inexpensive fire retardant-4 (FR4) board, using wet etching techniques. The parameters involved such as their shapes, width, length, the dielectric constant, the transmission line and via position and measurement technique was studied, analyzed numerically and experimentally in order to merge out with the optimum designs. The results gained were very encouraging.
This paper discusses the design and implementation of an active transmit-receive antenna, integra... more This paper discusses the design and implementation of an active transmit-receive antenna, integrating an active devices onto a printed antenna to improve its performance and combine functions within the antenna itself. It includes a circular polarized microstrip patch antenna, two amplifiers, a power divider and a rat race coupler to isolate transmit and receive paths. The beamwidth of the antenna is in the range of 600 to 700 for H plane. The radiation pattern for E plane is smaller compared to the H plane. The comparison between the passive and the active integrated antenna shows that the active integrated antenna has 3 dB extra gain compared to the passive antenna, for both transmit and receive. The isolation between transmit and receive is between 20 to 25 dB. This active antenna has potential uses in WLAN communication applications.
... T. Masri, MKARahim, O. Ayop Radio Communication Engineering Department (RaCED) Universiti Tek... more ... T. Masri, MKARahim, O. Ayop Radio Communication Engineering Department (RaCED) Universiti Teknologi Malaysia 81310, Skudai, Johor Bahru, Malaysia ithelaha ... This antenna is suitable for point-to-point and point to multi-point Dual-Band Wireless LAN applications that ...
In this paper, a modified slotted patch EBG structure has been investigated and followed by a dis... more In this paper, a modified slotted patch EBG structure has been investigated and followed by a discussion of the design and the evaluation of the structure. The result of the EBG structure in term of S21 is shown in simulation and measurement. The simulation process is being done using microwave office software 2006. The EBG structure is developed using inexpensive Fire Retardant-4 (FR4) board. The S21 result shows that the band gap of the structure is between 2.24 GHz and 2.6 GHz at -20 dB. The structure is then incorporated into a 2 by 2 antenna array operates at 2.4 GHz with a separation between X/2 and X. The result shows that the radiation pattern improved with reduced back lobe with an extra gain of 1 dB compared with the antenna without the EBG structure.
The design, simulation and fabrication of a left-handed metamaterial (LHM) structure is presented... more The design, simulation and fabrication of a left-handed metamaterial (LHM) structure is presented. The combination of the modified square rectangular Split Ring Resonator (SRR) and the Capacitance Loaded Strip (CLS) were used to obtain the negative value of permeability, µ and the negative permittivity, ε. Nicolson-Ross-Wier approach was used to identify the double negative region. A good agreement between simulated and measured results has been achieved. Upon incorporation with a single patch microstrip antenna, the performance of the antenna was improved where the gain of the microstrip antenna was increased up to 4 dB, and its bandwidth widens from 2.9% to 4.98%. These improvements are due to the negative refraction characteristics of the LHM structure that acts as a lens when placed in front of the antenna.
2008 IEEE International RF and Microwave Conference, 2008
... Osman Ayop, Mohamad Kamal A. Rahim and Thelaha Masri 1Department of Radio Communications, Fac... more ... Osman Ayop, Mohamad Kamal A. Rahim and Thelaha Masri 1Department of Radio Communications, Faculty of Electrical Engineering, Universiti Teknologi Malaysia, 81310 Skudai Johor Bahru. osman@fke.utm.my, mkamal@fke.utm.my, ithelaha@yahoo.com.my. ...
2007 Asia-Pacific Conference on Applied Electromagnetics, 2007
In this paper, a 3 by 3 dual band Electromagnetic Band Gap (EBG) structure has been designed to c... more In this paper, a 3 by 3 dual band Electromagnetic Band Gap (EBG) structure has been designed to cover the two frequency of unlicensed Band at 2.4 GHz and 5.2 GHz. The characteristic of the EBG structure is investigated by measuring the forward transmission coefficient, S 21 . The discussion of the design and the evaluation of the structure itself have been made. The simulation process was carried out using microwave office software. This structure has been designed using 1.6 mm Fire Retardant-4 (FR4) board which has relative permittivity of 4.9 and loss tangent of 0.019. The simulated result for S 21 shows the band gap frequencies measured are found to be between 2.037 GHz and 2.609 GHz with cover 2.4 GHz ISM band GHz and between 4.738 GHz and 5.492 GHz which cover 5.2 GHz UNI band.
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Papers by T. Masri