A compact radar system becomes a necessity in order to build a lightweight navigation radar. Rese... more A compact radar system becomes a necessity in order to build a lightweight navigation radar. Researches were conducted to create an integrated radar system in the form of one board of 9.3 GHz navigation radar system. Microstrip technology was used for its simple structure and miniaturization at high frequencies. Power divider as a part of the radar system was used to divide the signal from Voltage-Controlled Oscillator (VCO) to Transmitter front end and mixer on the Receiver end. This paper proposed the design and simulation of the Wilkinson Power Divider on Duroid RT5880 substrate using Advanced Design System (ADS) software. The S parameters were analyzed to see the performance of the divider. The proposed design already met the expected requirement of the power divider with more than -30 dB return loss, -3.059 dB insertion loss, and -29.541 dB isolation between divider output ports.
Energy Detection is a popular technique to detect primary user (PU) in cognitive radio (CR) compa... more Energy Detection is a popular technique to detect primary user (PU) in cognitive radio (CR) compared with others. Due to less complexity and easier to be implemented makes energy detector (ED) is a common technique in use for signal detection. This paper studies detection performance of primary signal under Additive White Gaussian Noise (AWGN) with low signal to noise ratio (SNR). The performance of ED is evaluated through receiver operating characteristic (ROC) curve with probability of detection (PD) and probability of false alarm (PF) as a metric. Then, probability of detection as a function of energy threshold is further studied. The derived results show that increasing the degree of energy threshold decreases detection performance in term of probability of detection.
A well-developed porous activated carbon materials were synthesized from palm kernel shell (PKS) ... more A well-developed porous activated carbon materials were synthesized from palm kernel shell (PKS) waste through the facile carbonization process with several KOH concentration, and the microwave absorbing performance were studied in the X-band range. The XRD and EDX measurement results confirmed the transformation from crystalline structure to the amorphous structure of cellulose of PKS materials with the higher carbon content. The BET analysis measures the pore size between 2–4 nm and a specific surface area between 554–825 m2/g. All activated carbon materials show the improvement of microwave absorbing performance compared to its hydro char or raw PKS materials, with the highest minimum return loss and frequency bandwidth of -37.85 dB at 11.02 GHz and 900 MHz, respectively, for activated carbon with only KOH concentration of 10%. The porous structure of AC-based PKS is benefitted to give better impedance matching and dielectric loss capacity to enhance the microwave absorbing perfo...
The increased growth of electronics and wireless communication systems causes the urge to find mi... more The increased growth of electronics and wireless communication systems causes the urge to find microwave absorbing materials that are lightweight, inexpensive, and environmentally friendly. In this study, we successfully synthesize activated carbon materials from the oil palm empty fruit bunch (OPEFB) as future microwave absorbing material candidates with a porous structure using different kalium hydroxide (KOH) concentrations during the activation process followed by physical carbonization at 800 °C under an inert atmosphere. The prepared porous activated carbon (PAC)-based OPEFB was characterized by several techniques, including x-ray diffraction, scanning electronic microscopy-energy dispersive x-ray analysis, and Brunauer–Emmett–Teller analysis. The microwave absorption properties of the PAC-based OPEFB were measured using one port rectangular waveguides at the X-band frequency range (from 8 to 12 GHz). A minimum reflection loss value of −32.21 dB (more than 99.9% absorption) at...
The far-ultraviolet C (UVC) light has been used recently as an alternative disinfection system to... more The far-ultraviolet C (UVC) light has been used recently as an alternative disinfection system to deactivate the novel coronaviruses that cause coronavirus disease (COVID-19) without introducing any health damage to humans. We investigate that the far-UVC light from far-UVC excimer lamps (BEST 20 Watt) is a promising candidate for a far-UVC disinfection system to prevent human-to-human transmission of COVID-19. The optical characterization of far-UVC excimer lamps was examined. The maximum irradiance of the far-UVC excimer lamps is 219 nm, which is known to have antimicrobial capabilities on microorganisms, including coronaviruses. We propose a design of a disinfection chamber system based on eight 219 nm far-UVC excimer lamps which are attached vertically about 35 cm to each other, and the irradiation angle was installed at the angle of approximately 120° in order to optimize the irradiation of far-UVC light to a human body. For microorganism inactivation at a distance of around 10...
Collision is the main issue in safe transportation, including in the railway system. Sensor syste... more Collision is the main issue in safe transportation, including in the railway system. Sensor systems have been developed to detect obstacles to prevent a collision, such as using cameras. One disadvantage of the camera systems is that performance detection decreases in a not clean environment, like the target position behind the fogs. This paper discusses the development of frequency modulated continuous wave (FMCW) radar signal processing for high-speed railway collision avoidance. The development of radar signal processing combines a two-dimensional constant false alarm rate (2D-CFAR) and robust principal component analysis (RPCA) to detect moving targets under clutter. Cell average (CA) and Greatest of CA (GOCA) CFAR are evaluated under a cluttered wall environment along the railway track. From the experiment, the development of FMCW radar can detect stationary or moving obstacles around 675 meters in front of the locomotive. Combining 2D-CFAR and RPCA algorithm outperforms averag...
IOP Conference Series: Materials Science and Engineering, 2019
The combination of of wireless millimeter-wave (MMW) bands and fiber optic cables is able to comp... more The combination of of wireless millimeter-wave (MMW) bands and fiber optic cables is able to compensate the propagation loss of millimeter waves in broadband communications and high-resolution imaging. This paper discusses the design and the realization of optical modulator using coplanar stripline (CPS) structure completed with the u-slot antenna patch for RF signal input. The substrate used for CPS structure is Lithium Niobat (LiNbO3) due to its large electro optical coefficient. A 10 Ghz radio wave frequency is inputted via microstrip u-slot antenna patch array 2 x 1 with input impedance 50 Ω, and acceptable return loss -10 dB. The light waves for the carrier are generated from the laser diode. Several measurements have been completely done and reported. The design is carried out by means of varying physical variable value which results in specification of the operating frequency 10 GHz. This is a pure research since the obtained results are not directly applied to the radio-over...
IOP Conference Series: Materials Science and Engineering, 2016
Microstrip antenna is a shaped thin board of antenna and capable for working at high frequencies.... more Microstrip antenna is a shaped thin board of antenna and capable for working at high frequencies. Microstrip antenna has a pattern strip shape in a various form, one of which is a rectangular shape. Microstrip antennas have some shortcomings which have narrow bandwidth and small gain, to cover the shortfall, the antenna is made using an array to increase the gain and u - slot to widen the bandwidth. In this paper will discuss the results of the antenna simulation using Ansoft HFSS software applications and their compliance with specifications designed antenna. In this issues we analysis the results of the design and simulation microstrip antenna at a frequency of 2.6 - 2.7 GHz for LTE applications
Asymmetric parallel-cascaded micro-ring resonator (APCMR) is proposed. The proposed device is com... more Asymmetric parallel-cascaded micro-ring resonator (APCMR) is proposed. The proposed device is composed of two or more micro-ring-resonators with different diameter. The proposed device is designed using transfer matrix combined with signal flow graph methods. The designed device with crosstalk less than and equal -10 dB can be obtained by setting coupling coefficient. The proposed device can be used for optical filters and sensors.
Second International Seminar on Photonics, Optics, and Its Applications (ISPhOA 2016), 2016
Optical filter is very important components in WDM network. MRR is a basic structure to design th... more Optical filter is very important components in WDM network. MRR is a basic structure to design the optical filter because of easy to design for improving its performance. This paper discusses an innovative structure of the MRR, which is Triple Coupler Ring Resonators (TCRR) for optical filter applications. Values of width between bus and ring and values of radius of the ring in the structure TCRR were analyzed and optimized for several variations for obtaining coupling coefficient values. Therefore, wide Free Spectral Range (FSR) and high crosstalk suppression bandwidth can be obtained. As results, at the optimized width of gap of 100 nm and the optimized radiation of 8 μm, FSR of 2.85 THz and crosstalk suppression bandwidth of 60 GHz were achieved. Based on the results, this structure can be used for filtering optical signals in optical fiber communication.
A compact radar system becomes a necessity in order to build a lightweight navigation radar. Rese... more A compact radar system becomes a necessity in order to build a lightweight navigation radar. Researches were conducted to create an integrated radar system in the form of one board of 9.3 GHz navigation radar system. Microstrip technology was used for its simple structure and miniaturization at high frequencies. Power divider as a part of the radar system was used to divide the signal from Voltage-Controlled Oscillator (VCO) to Transmitter front end and mixer on the Receiver end. This paper proposed the design and simulation of the Wilkinson Power Divider on Duroid RT5880 substrate using Advanced Design System (ADS) software. The S parameters were analyzed to see the performance of the divider. The proposed design already met the expected requirement of the power divider with more than -30 dB return loss, -3.059 dB insertion loss, and -29.541 dB isolation between divider output ports.
Energy Detection is a popular technique to detect primary user (PU) in cognitive radio (CR) compa... more Energy Detection is a popular technique to detect primary user (PU) in cognitive radio (CR) compared with others. Due to less complexity and easier to be implemented makes energy detector (ED) is a common technique in use for signal detection. This paper studies detection performance of primary signal under Additive White Gaussian Noise (AWGN) with low signal to noise ratio (SNR). The performance of ED is evaluated through receiver operating characteristic (ROC) curve with probability of detection (PD) and probability of false alarm (PF) as a metric. Then, probability of detection as a function of energy threshold is further studied. The derived results show that increasing the degree of energy threshold decreases detection performance in term of probability of detection.
A well-developed porous activated carbon materials were synthesized from palm kernel shell (PKS) ... more A well-developed porous activated carbon materials were synthesized from palm kernel shell (PKS) waste through the facile carbonization process with several KOH concentration, and the microwave absorbing performance were studied in the X-band range. The XRD and EDX measurement results confirmed the transformation from crystalline structure to the amorphous structure of cellulose of PKS materials with the higher carbon content. The BET analysis measures the pore size between 2–4 nm and a specific surface area between 554–825 m2/g. All activated carbon materials show the improvement of microwave absorbing performance compared to its hydro char or raw PKS materials, with the highest minimum return loss and frequency bandwidth of -37.85 dB at 11.02 GHz and 900 MHz, respectively, for activated carbon with only KOH concentration of 10%. The porous structure of AC-based PKS is benefitted to give better impedance matching and dielectric loss capacity to enhance the microwave absorbing perfo...
The increased growth of electronics and wireless communication systems causes the urge to find mi... more The increased growth of electronics and wireless communication systems causes the urge to find microwave absorbing materials that are lightweight, inexpensive, and environmentally friendly. In this study, we successfully synthesize activated carbon materials from the oil palm empty fruit bunch (OPEFB) as future microwave absorbing material candidates with a porous structure using different kalium hydroxide (KOH) concentrations during the activation process followed by physical carbonization at 800 °C under an inert atmosphere. The prepared porous activated carbon (PAC)-based OPEFB was characterized by several techniques, including x-ray diffraction, scanning electronic microscopy-energy dispersive x-ray analysis, and Brunauer–Emmett–Teller analysis. The microwave absorption properties of the PAC-based OPEFB were measured using one port rectangular waveguides at the X-band frequency range (from 8 to 12 GHz). A minimum reflection loss value of −32.21 dB (more than 99.9% absorption) at...
The far-ultraviolet C (UVC) light has been used recently as an alternative disinfection system to... more The far-ultraviolet C (UVC) light has been used recently as an alternative disinfection system to deactivate the novel coronaviruses that cause coronavirus disease (COVID-19) without introducing any health damage to humans. We investigate that the far-UVC light from far-UVC excimer lamps (BEST 20 Watt) is a promising candidate for a far-UVC disinfection system to prevent human-to-human transmission of COVID-19. The optical characterization of far-UVC excimer lamps was examined. The maximum irradiance of the far-UVC excimer lamps is 219 nm, which is known to have antimicrobial capabilities on microorganisms, including coronaviruses. We propose a design of a disinfection chamber system based on eight 219 nm far-UVC excimer lamps which are attached vertically about 35 cm to each other, and the irradiation angle was installed at the angle of approximately 120° in order to optimize the irradiation of far-UVC light to a human body. For microorganism inactivation at a distance of around 10...
Collision is the main issue in safe transportation, including in the railway system. Sensor syste... more Collision is the main issue in safe transportation, including in the railway system. Sensor systems have been developed to detect obstacles to prevent a collision, such as using cameras. One disadvantage of the camera systems is that performance detection decreases in a not clean environment, like the target position behind the fogs. This paper discusses the development of frequency modulated continuous wave (FMCW) radar signal processing for high-speed railway collision avoidance. The development of radar signal processing combines a two-dimensional constant false alarm rate (2D-CFAR) and robust principal component analysis (RPCA) to detect moving targets under clutter. Cell average (CA) and Greatest of CA (GOCA) CFAR are evaluated under a cluttered wall environment along the railway track. From the experiment, the development of FMCW radar can detect stationary or moving obstacles around 675 meters in front of the locomotive. Combining 2D-CFAR and RPCA algorithm outperforms averag...
IOP Conference Series: Materials Science and Engineering, 2019
The combination of of wireless millimeter-wave (MMW) bands and fiber optic cables is able to comp... more The combination of of wireless millimeter-wave (MMW) bands and fiber optic cables is able to compensate the propagation loss of millimeter waves in broadband communications and high-resolution imaging. This paper discusses the design and the realization of optical modulator using coplanar stripline (CPS) structure completed with the u-slot antenna patch for RF signal input. The substrate used for CPS structure is Lithium Niobat (LiNbO3) due to its large electro optical coefficient. A 10 Ghz radio wave frequency is inputted via microstrip u-slot antenna patch array 2 x 1 with input impedance 50 Ω, and acceptable return loss -10 dB. The light waves for the carrier are generated from the laser diode. Several measurements have been completely done and reported. The design is carried out by means of varying physical variable value which results in specification of the operating frequency 10 GHz. This is a pure research since the obtained results are not directly applied to the radio-over...
IOP Conference Series: Materials Science and Engineering, 2016
Microstrip antenna is a shaped thin board of antenna and capable for working at high frequencies.... more Microstrip antenna is a shaped thin board of antenna and capable for working at high frequencies. Microstrip antenna has a pattern strip shape in a various form, one of which is a rectangular shape. Microstrip antennas have some shortcomings which have narrow bandwidth and small gain, to cover the shortfall, the antenna is made using an array to increase the gain and u - slot to widen the bandwidth. In this paper will discuss the results of the antenna simulation using Ansoft HFSS software applications and their compliance with specifications designed antenna. In this issues we analysis the results of the design and simulation microstrip antenna at a frequency of 2.6 - 2.7 GHz for LTE applications
Asymmetric parallel-cascaded micro-ring resonator (APCMR) is proposed. The proposed device is com... more Asymmetric parallel-cascaded micro-ring resonator (APCMR) is proposed. The proposed device is composed of two or more micro-ring-resonators with different diameter. The proposed device is designed using transfer matrix combined with signal flow graph methods. The designed device with crosstalk less than and equal -10 dB can be obtained by setting coupling coefficient. The proposed device can be used for optical filters and sensors.
Second International Seminar on Photonics, Optics, and Its Applications (ISPhOA 2016), 2016
Optical filter is very important components in WDM network. MRR is a basic structure to design th... more Optical filter is very important components in WDM network. MRR is a basic structure to design the optical filter because of easy to design for improving its performance. This paper discusses an innovative structure of the MRR, which is Triple Coupler Ring Resonators (TCRR) for optical filter applications. Values of width between bus and ring and values of radius of the ring in the structure TCRR were analyzed and optimized for several variations for obtaining coupling coefficient values. Therefore, wide Free Spectral Range (FSR) and high crosstalk suppression bandwidth can be obtained. As results, at the optimized width of gap of 100 nm and the optimized radiation of 8 μm, FSR of 2.85 THz and crosstalk suppression bandwidth of 60 GHz were achieved. Based on the results, this structure can be used for filtering optical signals in optical fiber communication.
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Papers by Pamungkas Daud