The Experts below are selected from a list of 9030 Experts worldwide ranked by ideXlab platform

H. Ja'afar - One of the best experts on this subject based on the ideXlab platform.

  • Study of Coupling Sleeve of Monopole Plasma Antenna for Wi-Fi Application
    2018
    Co-Authors: M. Hilmi, Idnin Pasya, M. T. Ali, H. Ja'afar
    Abstract:

    This paper presents a design of Monopole Plasma Antenna using Fluorescent Tube which operates at 2.4 GHz. The Fluorescent Tube with dimension of 586 mm length and 24.2 mm diameter was used. In this research, the design was focused on the coupling sleeve that used a copper ring. The proposed antenna was simulated using CST Microwave Studio to study its performance. The measured return loss of this proposed antenna is presented. The analysis of the study is discussed.

  • Reconfigurable Plasma Antenna Array by Using Fluorescent Tube for Wi-Fi Application
    Radioengineering, 2016
    Co-Authors: H. Ja'afar, Mohd Ali, N. A. Halili, A. N. Dagang, Idnin Pasya Ibrahim, Hanisah Mohd Zali
    Abstract:

    This paper presents a new design of reconfigura- ble plasma antenna array using commercial Fluorescent Tube. A round shape reconfigurable plasma antenna array is proposed to collimate beam radiated by an omnidirec- tional antenna (monopole antenna) operating at 2.4 GHz in particular direction. The antenna design consists of a monopole antenna located at the center of a circular alu- minum ground. The monopole antenna is surrounded by a cylindrical shell of conducting plasma. The plasma shield consists of 12 commercial Fluorescent Tubes aligned in series containing a mixture of argon gas and mercury vapor which upon electrification forms plasma columns. The plasma behaves as a conductor and acts as a reflector in radiation, in the condition where plasma frequency, ωp is higher than the operating frequency. From this concepts, when all plasma elements are activated or switched to ON, the radiation signal from the monopole antenna will trapped inside the plasma blanket and meanwhile when one or more plasma elements is deactivated (switched OFF), the radiation from the monopole antenna will es- cape. This antenna has the capability to change its patterns with beam direction at 0°, 30°, 60°, 90°, 120°, 150°, 180°, 210°, 240°, 270°, 300° and 330° at frequency 2.4 GHz. The proposed antenna has been successfully fabricated and measured with conclusive results.

  • Development of Fluorescent Tube antenna array for Wi-Fi application
    2015 IEEE Symposium on Computer Applications & Industrial Electronics (ISCAIE), 2015
    Co-Authors: M. Hilmi, Hanisah Mohd Zali, Norsuzila Ya'acob, H. Ja'afar
    Abstract:

    The design of plasma antenna array for Wi-Fi application, operating at 2.4 GHz is presented in this paper. Two pieces of Fluorescent Tube with same dimension of 586 mm length and 24.2 mm diameter was used for this plasma antenna. The antennas are arranged in two parallel side-by-side. The gap between two Fluorescent Tubes is 10 mm. Both Tubes are filled with argon and mercury vapor. The proposed antenna is simulated using CST Microwave Studio to study its performance in terms of return loss, radiation pattern and gain.

  • ICT - A monopole Fluorescent Tube antenna with Wi-Fi Router
    2014 21st International Conference on Telecommunications (ICT), 2014
    Co-Authors: Hanisah Mohd Zali, Mohd Ali, Idnin Pasya, Norsuzila Ya'acob, N. A. Halili, H. Ja'afar, A. A. Azlan
    Abstract:

    A monopole plasma antenna for Wi-Fi application at 2.4 GHz was constructed using a commercially available Fluorescent Tube. The plasma antenna uses a Fluorescent Tube with length and diameter of 0.61 m and 0.025 m, respectively. The Tube contains a mixture of argon and mercury vapor, which becomes conductive when sufficiently ionized into plasma state, allowing transmissions of radio frequency signal. The constructed plasma antenna was equipped with an access-point WiFi Router which is installed inside the casing of the Fluorescent Tube. The antenna's capability to operate as either a transmitter or receiver in the particular frequency band was verified through a series of wireless transmission experiments. Experimental measurement using a portable spectrum analysis application validated the operability of the constructed antenna.

  • A Reconfigurable Monopole Antenna with Fluorescent Tubes by Using Plasma Windowing Concepts at 4.9GHz
    Advanced Materials Research, 2014
    Co-Authors: H. Ja'afar, Hanisah Mohd Zali, Mohd Ali, A. N. Dagang, N. A. Halili
    Abstract:

    This research aimed at investigating the performance of plasma windowing concept in terms of radiation pattern, gain and return loss. The antenna structure consists of 12 Tubes of commercial Fluorescent lamps that containing the mixture of mercury vapour and argon gas which upon electrification, forms plasma. After get sufficient voltage the gas inside the Fluorescent Tube will ionize to plasma and formed plasma column. When all of the Tubes surrounding the antenna are electrified, the radiation is trapped inside. By leaving one or more of the Tubes in a non-electrified state, apertures are formed in the plasma shield which allows radiation to escape. The plasma frequency in this experiment is equal to 5.634e11 Hz. This antenna design at 4.9 GHz. The advantages from this research, the design and construction of plasma antenna with Fluorescent Tubes can be beneficial in term of advancement in antennas technology especially in reconfigurable antenna.

Hanisah Mohd Zali - One of the best experts on this subject based on the ideXlab platform.

  • Reconfigurable Plasma Antenna Array by Using Fluorescent Tube for Wi-Fi Application
    Radioengineering, 2016
    Co-Authors: H. Ja'afar, Mohd Ali, N. A. Halili, A. N. Dagang, Idnin Pasya Ibrahim, Hanisah Mohd Zali
    Abstract:

    This paper presents a new design of reconfigura- ble plasma antenna array using commercial Fluorescent Tube. A round shape reconfigurable plasma antenna array is proposed to collimate beam radiated by an omnidirec- tional antenna (monopole antenna) operating at 2.4 GHz in particular direction. The antenna design consists of a monopole antenna located at the center of a circular alu- minum ground. The monopole antenna is surrounded by a cylindrical shell of conducting plasma. The plasma shield consists of 12 commercial Fluorescent Tubes aligned in series containing a mixture of argon gas and mercury vapor which upon electrification forms plasma columns. The plasma behaves as a conductor and acts as a reflector in radiation, in the condition where plasma frequency, ωp is higher than the operating frequency. From this concepts, when all plasma elements are activated or switched to ON, the radiation signal from the monopole antenna will trapped inside the plasma blanket and meanwhile when one or more plasma elements is deactivated (switched OFF), the radiation from the monopole antenna will es- cape. This antenna has the capability to change its patterns with beam direction at 0°, 30°, 60°, 90°, 120°, 150°, 180°, 210°, 240°, 270°, 300° and 330° at frequency 2.4 GHz. The proposed antenna has been successfully fabricated and measured with conclusive results.

  • Development of Fluorescent Tube antenna array for Wi-Fi application
    2015 IEEE Symposium on Computer Applications & Industrial Electronics (ISCAIE), 2015
    Co-Authors: M. Hilmi, Hanisah Mohd Zali, Norsuzila Ya'acob, H. Ja'afar
    Abstract:

    The design of plasma antenna array for Wi-Fi application, operating at 2.4 GHz is presented in this paper. Two pieces of Fluorescent Tube with same dimension of 586 mm length and 24.2 mm diameter was used for this plasma antenna. The antennas are arranged in two parallel side-by-side. The gap between two Fluorescent Tubes is 10 mm. Both Tubes are filled with argon and mercury vapor. The proposed antenna is simulated using CST Microwave Studio to study its performance in terms of return loss, radiation pattern and gain.

  • Design of monopole plasma antenna using Fluorescent Tube for wireless transmission applications / Hanisah Mohd Zali
    2015
    Co-Authors: Hanisah Mohd Zali
    Abstract:

    This thesis explains on the design of monopole plasma antenna using Fluorescent Tube and reviews the antenna performances in wireless transmission experiments. In this project a commercially available Fluorescent Tube is used as antenna. The gas inside the Fluorescent Tube is a mixture of argon and mercury vapor. When the gas is sufficiently ionized into plasma state, it becomes conductive and allows radio frequency signal to be transmitted and received. Based on this concept, the Fluorescent lamp was proposed to become as monopole plasma antenna due to the commercial product. This study includes three antenna designs which are antenna Design 1, antenna Design 2 and antenna Design 3. Antenna Design 1 was developed using single Fluorescent Tube to operate at 4.3 GHz frequency band. This antenna has good performances which achieved Sn

  • A Reconfigurable Monopole Antenna With Fluorescent Tubes Using Plasma Windowing Concepts for 4.9-GHz Application
    IEEE Transactions on Plasma Science, 2015
    Co-Authors: Hajar Ja’afar, Hanisah Mohd Zali, A. N. Dagang, Nur Aina Halili
    Abstract:

    This paper aimed at investigating the performance of plasma windowing concept in terms of radiation pattern, gain, and S-parameter. The antenna structure consists of 12 Tubes of commercial Fluorescent lamps that contain a mixture of mercury vapor and argon gas, which upon electrification, forms plasma. After getting sufficient voltage, the gas inside the Fluorescent Tube will ionize to plasma and form a plasma column. When all of the Tubes surrounding the antenna are electrified, the radiation is trapped inside. By leaving one or more of the Tubes in a nonelectrified state, apertures are formed in the plasma shield, which allow radiation to escape. The plasma frequency in this experiment is equal to 5.634e11 Hz. This antenna design is at 4.9 GHz. The designing of plasma antenna using Fluorescent Tubes has created advancement in antenna industry especially in reconfigurable antenna field.

  • ICT - A monopole Fluorescent Tube antenna with Wi-Fi Router
    2014 21st International Conference on Telecommunications (ICT), 2014
    Co-Authors: Hanisah Mohd Zali, Mohd Ali, Idnin Pasya, Norsuzila Ya'acob, N. A. Halili, H. Ja'afar, A. A. Azlan
    Abstract:

    A monopole plasma antenna for Wi-Fi application at 2.4 GHz was constructed using a commercially available Fluorescent Tube. The plasma antenna uses a Fluorescent Tube with length and diameter of 0.61 m and 0.025 m, respectively. The Tube contains a mixture of argon and mercury vapor, which becomes conductive when sufficiently ionized into plasma state, allowing transmissions of radio frequency signal. The constructed plasma antenna was equipped with an access-point WiFi Router which is installed inside the casing of the Fluorescent Tube. The antenna's capability to operate as either a transmitter or receiver in the particular frequency band was verified through a series of wireless transmission experiments. Experimental measurement using a portable spectrum analysis application validated the operability of the constructed antenna.

Bjorn Lussem - One of the best experts on this subject based on the ideXlab platform.

  • white organic light emitting diodes with Fluorescent Tube efficiency
    Nature, 2009
    Co-Authors: Sebastian Reineke, Frank Lindner, Gregor Schwartz, Nico Seidler, Karsten Walzer, Bjorn Lussem, Karl Leo
    Abstract:

    The development of white organic light-emitting diodes (OLEDs) holds great promise for the production of highly efficient large-area light sources. High internal quantum efficiencies for the conversion of electrical energy to light have been realized. Nevertheless, the overall device power efficiencies are still considerably below the 60-70 lumens per watt of Fluorescent Tubes, which is the current benchmark for novel light sources. Although some reports about highly power-efficient white OLEDs exist, details about structure and the measurement conditions of these structures have not been fully disclosed: the highest power efficiency reported in the scientific literature is 44 lm W(-1) (ref. 7). Here we report an improved OLED structure which reaches Fluorescent Tube efficiency. By combining a carefully chosen emitter layer with high-refractive-index substrates, and using a periodic outcoupling structure, we achieve a device power efficiency of 90 lm W(-1) at 1,000 candelas per square metre. This efficiency has the potential to be raised to 124 lm W(-1) if the light outcoupling can be further improved. Besides approaching internal quantum efficiency values of one, we have also focused on reducing energetic and ohmic losses that occur during electron-photon conversion. We anticipate that our results will be a starting point for further research, leading to white OLEDs having efficiencies beyond 100 lm W(-1). This could make white-light OLEDs, with their soft area light and high colour-rendering qualities, the light sources of choice for the future.

  • white organic light emitting diodes with Fluorescent Tube efficiency
    Nature, 2009
    Co-Authors: Sebastian Reineke, Frank Lindner, Gregor Schwartz, Nico Seidler, Karsten Walzer, Bjorn Lussem
    Abstract:

    Light-emitting diodes based on organic materials (known as OLEDs) are emerging as an attractive technology for a variety of lighting and display applications. If the performances of white-light OLEDs are improved, for example, they could be used to produce large-area lighting sources. That will require efficiencies on a par with existing technologies such as Fluorescent Tubes, which produce around 70 lumens per watt. That benchmark — 90 lumens per watt in fact — has now been achieved with OLEDs that make use of a novel emitter layer structure with high internal quantum efficiency, and high-index glass substrates to boost outcoupling efficiency. Before practical applications are possible, matters of cost, manufacturing methods and longevity need to be addressed, but the goal would be a future light source with a potentially smaller carbon footprint than today's technologies. Light-emitting diodes based on organic materials (known as OLEDs) have a number of attractive qualities that could make them the light sources of choice for the future. Unfortunately until now they have never reached the power efficiencies of Fluorescent Tubes. Here, the engineering of white OLEDs with power efficiencies at least as high as that of standard Fluorescent Tubes brings the future a little closer. The development of white organic light-emitting diodes1 (OLEDs) holds great promise for the production of highly efficient large-area light sources. High internal quantum efficiencies for the conversion of electrical energy to light have been realized2,3,4. Nevertheless, the overall device power efficiencies are still considerably below the 60–70 lumens per watt of Fluorescent Tubes, which is the current benchmark for novel light sources. Although some reports about highly power-efficient white OLEDs exist5,6, details about structure and the measurement conditions of these structures have not been fully disclosed: the highest power efficiency reported in the scientific literature is 44 lm W-1 (ref. 7). Here we report an improved OLED structure which reaches Fluorescent Tube efficiency. By combining a carefully chosen emitter layer with high-refractive-index substrates8,9, and using a periodic outcoupling structure, we achieve a device power efficiency of 90 lm W-1 at 1,000 candelas per square metre. This efficiency has the potential to be raised to 124 lm W-1 if the light outcoupling can be further improved. Besides approaching internal quantum efficiency values of one, we have also focused on reducing energetic and ohmic losses that occur during electron–photon conversion. We anticipate that our results will be a starting point for further research, leading to white OLEDs having efficiencies beyond 100 lm W-1. This could make white-light OLEDs, with their soft area light and high colour-rendering qualities, the light sources of choice for the future.

  • white organic light emitting diodes with Fluorescent Tube efficiency
    MRS Proceedings, 2009
    Co-Authors: Sebastian Reineke, Frank Lindner, Gregor Schwartz, Nico Seidler, Karsten Walzer, Bjorn Lussem
    Abstract:

    White organic LEDs are seen as one of the next generation light-sources, with their potential to reach internal efficiencies of unity and their unique appearance as large-area and ultrathin devices. However, to replace existing lighting technologies, they have to be at least on par with the state-of-the-art. In terms of efficiency, the Fluorescent Tube with 60-70 lumen per Watt (lm W -1 ) in a fixture is the current benchmark. In the scientific literature, so far only values of 44 lm W -1 have been published for white OLEDs. Here, we present results (Reineke et al., Nature 459, 234 (2009)) of white OLEDs with 90 lm W -1 at an illumination relevant brightness of 1,000 candela per square meter (cd m -2 ). Extracting all light from the glass substrate using a 3D light extraction system, we even obtain 124 lm W -1 . In order to achieve such high efficacy values, we reduced the energetic losses prior to photon emission that include ohmic and thermal relaxation losses, leading to very low operating voltages. This is accomplished by the use of doped transport layers and a novel, very energy efficient emission layer concept. Equally important, we addressed the optics of the OLED architecture, because about 80% of the generated light remains trapped in conventional devices. Therefore, we used high refractive index substrates to couple out more light and placed the emission to the second field antinode to avoid plasmonic losses. Our devices are also characterized by an outstandingly high efficiency at high brightness, reaching 74 lm W -1 at 5,000 cd m -2 .

Sebastian Reineke - One of the best experts on this subject based on the ideXlab platform.

  • white organic light emitting diodes with Fluorescent Tube efficiency
    Nature, 2009
    Co-Authors: Sebastian Reineke, Frank Lindner, Gregor Schwartz, Nico Seidler, Karsten Walzer, Bjorn Lussem, Karl Leo
    Abstract:

    The development of white organic light-emitting diodes (OLEDs) holds great promise for the production of highly efficient large-area light sources. High internal quantum efficiencies for the conversion of electrical energy to light have been realized. Nevertheless, the overall device power efficiencies are still considerably below the 60-70 lumens per watt of Fluorescent Tubes, which is the current benchmark for novel light sources. Although some reports about highly power-efficient white OLEDs exist, details about structure and the measurement conditions of these structures have not been fully disclosed: the highest power efficiency reported in the scientific literature is 44 lm W(-1) (ref. 7). Here we report an improved OLED structure which reaches Fluorescent Tube efficiency. By combining a carefully chosen emitter layer with high-refractive-index substrates, and using a periodic outcoupling structure, we achieve a device power efficiency of 90 lm W(-1) at 1,000 candelas per square metre. This efficiency has the potential to be raised to 124 lm W(-1) if the light outcoupling can be further improved. Besides approaching internal quantum efficiency values of one, we have also focused on reducing energetic and ohmic losses that occur during electron-photon conversion. We anticipate that our results will be a starting point for further research, leading to white OLEDs having efficiencies beyond 100 lm W(-1). This could make white-light OLEDs, with their soft area light and high colour-rendering qualities, the light sources of choice for the future.

  • white organic light emitting diodes with Fluorescent Tube efficiency
    Nature, 2009
    Co-Authors: Sebastian Reineke, Frank Lindner, Gregor Schwartz, Nico Seidler, Karsten Walzer, Bjorn Lussem
    Abstract:

    Light-emitting diodes based on organic materials (known as OLEDs) are emerging as an attractive technology for a variety of lighting and display applications. If the performances of white-light OLEDs are improved, for example, they could be used to produce large-area lighting sources. That will require efficiencies on a par with existing technologies such as Fluorescent Tubes, which produce around 70 lumens per watt. That benchmark — 90 lumens per watt in fact — has now been achieved with OLEDs that make use of a novel emitter layer structure with high internal quantum efficiency, and high-index glass substrates to boost outcoupling efficiency. Before practical applications are possible, matters of cost, manufacturing methods and longevity need to be addressed, but the goal would be a future light source with a potentially smaller carbon footprint than today's technologies. Light-emitting diodes based on organic materials (known as OLEDs) have a number of attractive qualities that could make them the light sources of choice for the future. Unfortunately until now they have never reached the power efficiencies of Fluorescent Tubes. Here, the engineering of white OLEDs with power efficiencies at least as high as that of standard Fluorescent Tubes brings the future a little closer. The development of white organic light-emitting diodes1 (OLEDs) holds great promise for the production of highly efficient large-area light sources. High internal quantum efficiencies for the conversion of electrical energy to light have been realized2,3,4. Nevertheless, the overall device power efficiencies are still considerably below the 60–70 lumens per watt of Fluorescent Tubes, which is the current benchmark for novel light sources. Although some reports about highly power-efficient white OLEDs exist5,6, details about structure and the measurement conditions of these structures have not been fully disclosed: the highest power efficiency reported in the scientific literature is 44 lm W-1 (ref. 7). Here we report an improved OLED structure which reaches Fluorescent Tube efficiency. By combining a carefully chosen emitter layer with high-refractive-index substrates8,9, and using a periodic outcoupling structure, we achieve a device power efficiency of 90 lm W-1 at 1,000 candelas per square metre. This efficiency has the potential to be raised to 124 lm W-1 if the light outcoupling can be further improved. Besides approaching internal quantum efficiency values of one, we have also focused on reducing energetic and ohmic losses that occur during electron–photon conversion. We anticipate that our results will be a starting point for further research, leading to white OLEDs having efficiencies beyond 100 lm W-1. This could make white-light OLEDs, with their soft area light and high colour-rendering qualities, the light sources of choice for the future.

  • white organic light emitting diodes with Fluorescent Tube efficiency
    MRS Proceedings, 2009
    Co-Authors: Sebastian Reineke, Frank Lindner, Gregor Schwartz, Nico Seidler, Karsten Walzer, Bjorn Lussem
    Abstract:

    White organic LEDs are seen as one of the next generation light-sources, with their potential to reach internal efficiencies of unity and their unique appearance as large-area and ultrathin devices. However, to replace existing lighting technologies, they have to be at least on par with the state-of-the-art. In terms of efficiency, the Fluorescent Tube with 60-70 lumen per Watt (lm W -1 ) in a fixture is the current benchmark. In the scientific literature, so far only values of 44 lm W -1 have been published for white OLEDs. Here, we present results (Reineke et al., Nature 459, 234 (2009)) of white OLEDs with 90 lm W -1 at an illumination relevant brightness of 1,000 candela per square meter (cd m -2 ). Extracting all light from the glass substrate using a 3D light extraction system, we even obtain 124 lm W -1 . In order to achieve such high efficacy values, we reduced the energetic losses prior to photon emission that include ohmic and thermal relaxation losses, leading to very low operating voltages. This is accomplished by the use of doped transport layers and a novel, very energy efficient emission layer concept. Equally important, we addressed the optics of the OLED architecture, because about 80% of the generated light remains trapped in conventional devices. Therefore, we used high refractive index substrates to couple out more light and placed the emission to the second field antinode to avoid plasmonic losses. Our devices are also characterized by an outstandingly high efficiency at high brightness, reaching 74 lm W -1 at 5,000 cd m -2 .

N. A. Halili - One of the best experts on this subject based on the ideXlab platform.

  • Reconfigurable Plasma Antenna Array by Using Fluorescent Tube for Wi-Fi Application
    Radioengineering, 2016
    Co-Authors: H. Ja'afar, Mohd Ali, N. A. Halili, A. N. Dagang, Idnin Pasya Ibrahim, Hanisah Mohd Zali
    Abstract:

    This paper presents a new design of reconfigura- ble plasma antenna array using commercial Fluorescent Tube. A round shape reconfigurable plasma antenna array is proposed to collimate beam radiated by an omnidirec- tional antenna (monopole antenna) operating at 2.4 GHz in particular direction. The antenna design consists of a monopole antenna located at the center of a circular alu- minum ground. The monopole antenna is surrounded by a cylindrical shell of conducting plasma. The plasma shield consists of 12 commercial Fluorescent Tubes aligned in series containing a mixture of argon gas and mercury vapor which upon electrification forms plasma columns. The plasma behaves as a conductor and acts as a reflector in radiation, in the condition where plasma frequency, ωp is higher than the operating frequency. From this concepts, when all plasma elements are activated or switched to ON, the radiation signal from the monopole antenna will trapped inside the plasma blanket and meanwhile when one or more plasma elements is deactivated (switched OFF), the radiation from the monopole antenna will es- cape. This antenna has the capability to change its patterns with beam direction at 0°, 30°, 60°, 90°, 120°, 150°, 180°, 210°, 240°, 270°, 300° and 330° at frequency 2.4 GHz. The proposed antenna has been successfully fabricated and measured with conclusive results.

  • ICT - A monopole Fluorescent Tube antenna with Wi-Fi Router
    2014 21st International Conference on Telecommunications (ICT), 2014
    Co-Authors: Hanisah Mohd Zali, Mohd Ali, Idnin Pasya, Norsuzila Ya'acob, N. A. Halili, H. Ja'afar, A. A. Azlan
    Abstract:

    A monopole plasma antenna for Wi-Fi application at 2.4 GHz was constructed using a commercially available Fluorescent Tube. The plasma antenna uses a Fluorescent Tube with length and diameter of 0.61 m and 0.025 m, respectively. The Tube contains a mixture of argon and mercury vapor, which becomes conductive when sufficiently ionized into plasma state, allowing transmissions of radio frequency signal. The constructed plasma antenna was equipped with an access-point WiFi Router which is installed inside the casing of the Fluorescent Tube. The antenna's capability to operate as either a transmitter or receiver in the particular frequency band was verified through a series of wireless transmission experiments. Experimental measurement using a portable spectrum analysis application validated the operability of the constructed antenna.

  • A Reconfigurable Monopole Antenna with Fluorescent Tubes by Using Plasma Windowing Concepts at 4.9GHz
    Advanced Materials Research, 2014
    Co-Authors: H. Ja'afar, Hanisah Mohd Zali, Mohd Ali, A. N. Dagang, N. A. Halili
    Abstract:

    This research aimed at investigating the performance of plasma windowing concept in terms of radiation pattern, gain and return loss. The antenna structure consists of 12 Tubes of commercial Fluorescent lamps that containing the mixture of mercury vapour and argon gas which upon electrification, forms plasma. After get sufficient voltage the gas inside the Fluorescent Tube will ionize to plasma and formed plasma column. When all of the Tubes surrounding the antenna are electrified, the radiation is trapped inside. By leaving one or more of the Tubes in a non-electrified state, apertures are formed in the plasma shield which allows radiation to escape. The plasma frequency in this experiment is equal to 5.634e11 Hz. This antenna design at 4.9 GHz. The advantages from this research, the design and construction of plasma antenna with Fluorescent Tubes can be beneficial in term of advancement in antennas technology especially in reconfigurable antenna.

  • Performance Analysis of a Monopole Antenna with Fluorescent Tubes at 4.9GHz Application.
    Innovative Systems Design and Engineering, 2013
    Co-Authors: Mohd Ali, Hanisah Mohd Zali, N. A. Halili, A. N. Dagang, H. Ja'afar
    Abstract:

    This paper presents of analysis the performance monopole antenna with Fluorescent Tubes. The antenna was designed at the operating frequency which is 4.9 GHz. The commercially Fluorescent Tubes consist of a glass Tube filled with mixture mercury vapor and argon gas. After get sufficient voltage the gas inside the Fluorescent Tube will ionize to plasma and formed plasma column. The plasma frequency is equal to 5.634e11 Hz. The plasma is highly conducting and acts as a reflector. When all of the Tubes surrounding the antenna are electrified, the radiation is trapped inside when the plasma frequency is greater than radio frequency. An accomplishment of the design has been carried out using CST microwave studio software. The developed antenna has potential in military application. To conclude, antenna’s performance was analyzed in terms of return loss, radiation pattern and gain. Keywords : Plasma, monopole antenna, return loss, radiation pattern, gain.

  • A monopole Fluorescent Tube antenna in wireless communication application
    2013 10th International Conference on Electrical Engineering Electronics Computer Telecommunications and Information Technology, 2013
    Co-Authors: H. Ja'afar, Hanisah Mohd Zali, Mohd Ali, N. A. Halili, A. N. Dagang
    Abstract:

    This paper present investigation on plasma monopole antenna using a single Fluorescent Tube and reviews the antenna performance as a transmitter and receiver. From the measurement it is shown that plasma antenna is just effective as metal antennas and it can work as a transmitter and receiver signals. Plasma antenna consists of glass Tube filled with some neutral gases such as Argon. In the experiment a commercially available Fluorescent Tube function as a plasma antenna, with length 0.31m (l) and diameter 0.031m (r) is used as the plasma antenna. The Tube was energized by 12 V DC, and 0.8 A current, which is provided by a standard DC power supply. The DC power supply was connected to DC ballast before directed to both electrodes of the Fluorescent Tube. A Vector Network Analyzer (VNA) is connected to coupling sleeve. This simulation is performed by using the simulation software Computer Simulation Technology (CST) Microwave Studio. The frequency target range 700MHz until 900MHz which is this frequency can apply in ultra high frequency (UHF).