mochamad yunus - Academia.edu (original) (raw)

Papers by mochamad yunus

Performance Analysis of Learner Behavior Through Online Learning Using Learning Management System

2023 11th International Conference on Information and Education Technology (ICIET)

Antena mikrostrip banyak digunakan pada perangkat telekomunikasi karena mudah difabrikasi, tipis ... more Antena mikrostrip banyak digunakan pada perangkat telekomunikasi karena mudah difabrikasi, tipis dan ringan. Tetapi perolehan karakteristik sebagai radiasi seperti gain dan efisiensi rendah. Untuk memperbaiki karakteristik radiasi digunakan antena susun. Pada antena susun teradi kopling gandeng antara elemen yang berdekatan. Untuk mereduksi kopling gandeng disisipkan stripline struktur split ring resonator (SRR) sebagai electromagnetic bandgap (EBG) di antara elemen yang berdekatan pada antena susun. EBG dengan struktur SRR menghasilkan kopling gandeng pada rentan frekuensi 2,56 GHz – 3,0 GHz. Struktur EBG yang disisipkan di antara elemen antena susun patch persegi mengurangi kopling gandeng hingga 6,26 dB pada rentan frekuensi 2,56 GHz – 3,0 GHz. Kata Kunci : Antena Mikrostrip , electromagnetic bandgap, split ring resonator

Meandered Inductor Shape of DGS for Coupling Suppression Between Adjacent Elements of Array Antenna

2018 Progress in Electromagnetics Research Symposium (PIERS-Toyama)

Defected ground structure (DGS) has been recently applied to enhance the bandwidth and gain of mi... more Defected ground structure (DGS) has been recently applied to enhance the bandwidth and gain of microstrip antenna, as well as to effectively improve the radiation characteristics by suppressing the higher mode harmonics and coupling between adjacent elements of array antenna. This paper presents the use of DGS which takes meandered inductor (MI) shape to improve the return loss ($S_{11}$) and to suppress the coupling between adjacent elements ($S_{21}$) of array antenna. An FR4 epoxy dielectric substrate with the thickness of 1.6 mm is used for deploying the antenna. The MI shape slot is embedded on the groundplane at the bottom side of dielectric substrate between two elements of array antenna which are deployed on the top side. The simulated results show that values of S11S_{11}S11 and S21S_{21}S21 have been improved up to 4.4 dB and 1.9 dB, respectively, at the resonant frequency of 2 GHz. This is comparable with the measured results which have achievement up to 8 dB and 5 dB for S11S_{11}S11 and S21S_{21}S21, respectively.

Design of Linear Array Triangular Patch Antenna for Mobile Communication

2019 IEEE 5th International Conference on Wireless and Telematics (ICWT)

Mobile communication is growing rapidly, hence it requires devices including an antenna which is ... more Mobile communication is growing rapidly, hence it requires devices including an antenna which is small, light, and compact. Researches on microstrip antennas which emphasize on its performance and miniaturization have been carried out extensively. The selection of dielectric material could sometimes achieve the desired antenna performance for some application. Therefore, the dielectric material usage is still one of important factors in the design and implementation of microstrip antennas. This paper proposes a 1×2 linear array triangular patch antenna design for mobile communication application. The array antenna which is designed on FR4 epoxy dielectric substrate with the thickness of 1.6 mm and relative permittivity 4.3 is configured with several feeding line systems. Some antenna parameters such as operating frequency, reflection coefficient, bandwidth, and gain are used to evaluate the performance of array antenna. From the characterization, the proposed array antenna has operating frequency of 2.364 GHz, reflection coefficient of −35.753 dB, working bandwidth of 83 MHz, and gain of 3.375 dB.

Impact of CSRR Incorporation in Lowering Resonant Frequency of X-Band SIW Antenna

2019 IEEE 13th International Conference on Telecommunication Systems, Services, and Applications (TSSA)

In this paper, the impact of complimentary split ring resonator (CSRR) incorporation in lowering ... more In this paper, the impact of complimentary split ring resonator (CSRR) incorporation in lowering resonant frequency of X-band substrate integrated waveguide (SIW) antenna is investigated. Two concentric ring slots of CSRR are incorporated into the radiator of X-band SIW antenna which is constructed by an extended half-circle shape and fed using a microstrip line. A 1.6mm thick FR4 epoxy dielectric substrate with the dimension of 36mm by 22mm is used to deploy the proposed antenna. In order to shows the potency of resonant frequency lowering by incorporating CSRR structure, the conventional antenna, i.e. an X-band SIW antenna without CSRR, is also designed using the same dielectric substrate. The characterization result shows that the proposed X-band SIW antenna could resonate at the frequency of 12% lower than the conventional antenna without any significant changes in other radiation characteristics.

Planar Array-Antenna with Improved Radiation Characteristic Using Spiral Shaped DGS

2018 International Conference on Applied Electromagnetics, Signal Processing and Communication (AESPC)

In this paper, the improvement of radiation characteristic for planar array-antenna by incorporat... more In this paper, the improvement of radiation characteristic for planar array-antenna by incorporating spiral shaped defected-ground-structure (DGS) is presented. The proposed planar array-antenna which is designed to work at the frequency of 2.4GHz consists of 4×4 elements in which the inset feed method is employed to excite each antenna element. The planar array-antenna is implemented using a 1.6 mm thick FR4 epoxy dielectric substrate and analyzed through a simulation. The simulated result of radiation characteristics for the planar array-antenna is then validated by experimental characterization. It shows that the spiral shaped DGS incorporation yields measured radiation characteristics of the planar array-antenna to have the bandwidth response of 140 MHz and the gain achievement of 10.47 dB at its resonant frequency. This is comparable to the simulated result which is showing the potentiality of spiral shaped DGS usage in the improvement of radiation characteristics.

Incorporation of Spiral Shaped Defected Ground Structure for Improving Radiation Characteristic of Planar Array-Antenna

2019 IEEE Conference on Antenna Measurements & Applications (CAMA)

This paper deals with the incorporation of spiral shaped defected ground structure (DGS) for impr... more This paper deals with the incorporation of spiral shaped defected ground structure (DGS) for improving radiation characteristic for planar array-antenna. The proposed planar array-antenna which is intended to operate at the frequency of 2.4GHz is designed on an FR4 epoxy dielectric substrate with the thickness of 1.6 mm and analyzed by use of a simulation software. It consists of 4× 4 elements where the microstrip line inset feeding method is employed to excite each antenna element. The characterization results show that the use of spiral shaped DGS yields the measured radiation characteristic to achieve the gain achievement of 10.47 dBi at the resonant frequency and the −10ddB bandwidth response of 140 MHz. These results are comparable to the simulated ones which are showing the potentiality of spiral shaped DGS incorporation for the radiation characteristics improvement.

Design of Rectangular Patch Antenna with Double-F-Slot for RFID Application

2020 14th International Conference on Telecommunication Systems, Services, and Applications (TSSA

Recently, the need for security system devices using Radio Frequency Identification (RFID) system... more Recently, the need for security system devices using Radio Frequency Identification (RFID) systems tends to increase. It is well-known that RFID is a small planar-shaped electronic device consisting of an electronic microchip and antenna. In this paper, the design of a rectangular patch antenna with double-F-slot in the frequency range of 2.4GHz–2.48GHz is presented in accordance with the Regulation of the Minister of Communication and Information of the Republic of Indonesia for Short Range Device (SRD) applications. The proposed antenna is designed on an FR-4 epoxy dielectric substrate with the thickness of 1.6mm and the relative permittivity of 4.4. The proposed antenna has the patch dimensions of 36.9mm × 27.1mm and the dimensions of 46.5mm × 35.4mm. Simulation results of the proposed antenna has the S11 value of –46.83 dB, the bandwidth response of 63MHz for the S11 ≤ –10dB, and the gain achievement of 1.201dBi at the frequency of 2.47 GHz.

Planar array approach as alternative method to characterize radiation pattern of 2 × 2 spiral resonator (SR) structure

2017 Progress in Electromagnetics Research Symposium - Fall (PIERS - FALL), 2017

This paper presents the planar array approach as an alternative method to characterize radiation ... more This paper presents the planar array approach as an alternative method to characterize radiation pattern of spiral resonator (SR) structure. The method involves the development of linear array approach of SR structure with a single patch discussed herein. The planar array is constructed of 2 × 2 SR structure in which each single patch of SR structure is assumed as a similar non-isotropic point source. To verify the proposed planar array approach, the 2 × 2 SR structure implemented as an antenna radiator is characterized using 3D simulation software and experimentally measured to obtain its radiation pattern. The maximum electric field intensities of radiation pattern at the boresight direction obtained from the proposed approach, simulation, and measurement are 24.54 V/m, 24.56V/m, and 24.49 V/m, respectively. It shows that the electric field intensities at the boresight direction have good agreement each other.

Bowtie-shaped DGS for reducing coupling between elements of planar array antenna

2017 International Symposium on Electronics and Smart Devices (ISESD), 2017

In this paper, the utilization of bowtie-shaped defected ground structure (DGS) incorporated into... more In this paper, the utilization of bowtie-shaped defected ground structure (DGS) incorporated into the groundplane of planar array antenna is proposed to reduce the coupling between two elements of planar array antenna. A double side of FR4 epoxy dielectric substrate with the dimension of 105mm × 130mm and the thickness of 1.6mm is used to deploy the planar array antenna. Two elements of planar array antenna are placed on the top side of dielectric substrate, while the bowtieshaped DGS is put in the groundplane at the bottom side. To reduce the amount of coupling between two elements of planar array antenna, the DGS which takes bowtie-shaped is introduced. From the results, both simulation and measurement verified that the bowtie-shaped DGS reduced the coupling at the resonance frequency of 1.955 GHz. The simulated and measured couplings could be reduced up to 0.67 dB and 2.4 dB, respectively.

Coupling reduction between two elements of array antenna using U-shaped defected ground structure

2017 International Conference on Control, Electronics, Renewable Energy and Communications (ICCREC), 2017

This paper presents the U-shaped defected ground structure (DGS) which is incorporated into the g... more This paper presents the U-shaped defected ground structure (DGS) which is incorporated into the groundplane of array antenna to reduce the coupling between antenna elements. The array antenna is constructed of two layers of flame resistant (FR) 4 epoxy dielectric substrate with the thickness of each layer of 1.6mm. The U-shaped DGS is placed at the bottom side of second layer between two elements of array antenna located on the top side of first layer. A proximity feeding technique of microstrip line applied to feed each antenna element is positioned on the top side of second layer. By reducing the coupling which is generated due to the input power at both feeding ports, the radiation characteristics of array antenna can be improved. To demonstrate the feasibility of U-shaped DGS in coupling reduction, an array antenna without DGS is also investigated. The characterization results have verified that the U-shaped DGS is applicable to reduced the coupling at the resonant frequency of 2.38GHz up to 2dB and 0.88dB for simulation and measurement, respectively.

Wideband monofilar helical antenna for wireless communication in remote area

2017 11th International Conference on Telecommunication Systems Services and Applications (TSSA), 2017

This paper presents the wideband monofilar helical antenna which is aimed to increase low level s... more This paper presents the wideband monofilar helical antenna which is aimed to increase low level signal reception commonly occurs in the remote area such as highlands, ridge, and borderlands. The use of helical antenna type is due to its ability in producing circularly polarized wave useful to support wireless communication frequently surrounded by some obstructions. The proposed antenna is expected to operate at wideband frequency range including cellular communication and connectable to the GSM modem associated with a laptop or PC device. The antenna is designed by using thin copper wire with spiral turn number of 8 and fed through a 50Ω female N-connector type. The proposed monofilar helical antenna is then realized based on the optimum design for experimental characterization. The measurement result shows that the realized antenna has working frequency from 1200 MHz to 2250 MHz and has the gain up to 14.5 dBi.

Size Reduction of Printed Antenna Based on Spiral Resonator Incorporated with Matching Circuit for Performance Enhancement

2018 IEEE Conference on Antenna Measurements & Applications (CAMA), 2018

The development of wireless communication system often requires the device with compact size and ... more The development of wireless communication system often requires the device with compact size and light weight. To satisfy the requirement, the device should comprise of small parts, in which one of them is using printed antenna. Many researches on size reduction of printed antenna have been conducted. By using spiralresonator (SR) shape incorporated with matching circuit, in this paper, the size reduction of printed antenna is presented which is aimed to enhance the antenna performance. The proposed antenna is designed using two layers of1.6mm thick FR4 dielectric substrate with a proximity coupled technique applied as the feeding system. It is found that the proposed technique offered the proposed antenna to have the S11S_{11}S11 value of 25dB, the bandwidth of 40MHz, and the gain achievement of 2.3dBi. This is better than the performance of printed antenna without matching circuit which has the S11S_{11}S11 value of 15dB, the -10dB bandwidth of 30MHz, and the gain achievement of -0.5dBi. Moreover, the size of proposed antenna is reduced significantly up to 60% compared to the conventional patch antenna.

Perkembangan teknologi komunikasi bergerak demikian cepatnya dan menghendaki dimensi perangkat kh... more Perkembangan teknologi komunikasi bergerak demikian cepatnya dan menghendaki dimensi perangkat khususnya antena yang kecil, ringan dan kompak. Untuk memenuhi kebutuhan tersebut, berbagai riset miniaturisasi dimensi telah banyak dilakukan. Miniaturisasi dimensi antena dapat dilakukan dengan menggunakan substrat dielektrik dengan permitivitas yang tinggi, tetapi berdampak pada penurunan kinerja antena dan sudah ditinggalkan. Miniaturisasi dengan menggunakan teknologi metamaterial MNG struktur spiral resonator (SR) mampu mereduksi dimensi antena antara 30%-60% dengan perbaikan kinerja yang cukup signifikan.

— The development of telecommunications technology, especially mobile and wireless greatly impact... more — The development of telecommunications technology, especially mobile and wireless greatly impacted the development of telecommunications equipment, one of these devices is the ability to be able to work on several technologies. This also affects the development of devices or components, including antennas, which can operate on several frequency bands from the telecommunications technology. In this paper, antennas with dual band frequency response for GPS (Global Positioning System) and WLAN (Wireless Local Area Network) applications are proposed to be designed based on metamaterial structures and realized by printing them on dielectric substrates. The use of metamaterial structure is based on its advantages, especially to get the dimensions and compact antenna architecture. The proposed print antenna is designed on an FR4 epoxy dielectric substrate with a total thickness of 1.6mm, while the length and width are 72mm and 51mm respectively. From the measurement results, the proposed ...

IoT System Implementation for ATmega328 Microcontroller Based Home Door Control

2019 IEEE 5th International Conference on Wireless and Telematics (ICWT), 2019

The house gate or home door control system uses a lot of infrared remote control, and it takes ti... more The house gate or home door control system uses a lot of infrared remote control, and it takes time to look for an infrared remote control if there is a loss of the remote. On the basis of this thought a design tool was made that was able to be used automatically. This home door control system works automatically when the electricity supply from PLN provides voltage to the power supply to turn on the ATMega328 microcontroller, Wi-Fi NodeMCU ESP8266 module, LCD and L298 shield motor driver. The Wi-Fi module will receive orders to open the house gate through a smartphone, and will provide notifications to LCD, LED and smartphone. This control system can accept orders to open and close the gate of house which depends on the speed of internet connection.

TM Mode Rectangular Waveguide Antenna for 2.3GHz LTE Recipient Signal Enhancement

2019 IEEE 13th International Conference on Telecommunication Systems, Services, and Applications (TSSA), 2019

One method to improve quality of signal in wireless communication is by strengthening the recipie... more One method to improve quality of signal in wireless communication is by strengthening the recipient signal of antenna. In this paper, the development of TM mode rectangular waveguide antenna applied to enhance 2.3GHz Long-Term Evolution (LTE) reception signal is presented. The proposed rectangular waveguide antenna which is designed to work at the resonant frequency of 2.3GHz aims to be implemented as an external antenna on a Huawei E5372s modem device. Some parametric studies on the antenna geometry are carried out during the design process by varying length of probe excitation and the dimension of waveguide. From the measurement of antenna characteristics, the reflection coefficient of -29.535dB at the resonant frequency of 2.309GHz can be achieved by the realized antenna with the bandwidth and gain achievement of 145MHz and 3.287dBi, respectively. While from the measurement of signal quality, the realized TM mode rectangular waveguide antenna can enhance up to 6.3dB the power of ...

SR-Based Printed Antenna Array with Reduced Size

2018 12th International Conference on Telecommunication Systems, Services, and Applications (TSSA), 2018

Array of antenna with reduced size is required for wireless and mobile communications due to the ... more Array of antenna with reduced size is required for wireless and mobile communications due to the portability properties. This paper presents a printed antenna array based on spiral resonator (SR) with reduced size. The proposed antenna array is configured by use of 2×2 patches of SR structure on two layers of FR4 epoxy dielectric substrate with each thickness of 1.6 mm. The characterization result of proposed printed antenna array provides the reflection coefficient (S11) value of −23 dB at the frequency of 2.4 GHz with the working bandwidth of 95 MHz for the S11 value less than −10 dB. Meanwhile, the gain of proposed printed antenna array achieves around 7 dB. The simulation result is verified with the measurement one which shows a good agreement. Moreover, the size of proposed SR-based 2×2 printed antenna array is reduced up to 27% compared to the one of 2×2 printed square patches antenna array.

Journal of ICT Research and Applications, 2019

This paper presents the development of a two-stage low noise amplifier (LNA) operating at the S-b... more This paper presents the development of a two-stage low noise amplifier (LNA) operating at the S-band frequency that is implemented using the non-simultaneous conjugate match (NSCM) technique. The motivation of this work was to solve the issue of the gain of LNAs designed using the most commonly used technique, i.e. simultaneous conjugate match (SCM), which often produce an increase of other parameter values, i.e. noise figure and voltage standing wave ratio (VSWR). Prior to hardware implementation, the circuit simulation software Advanced Design System (ADS) was applied to design the two-stage S-band LNA and to determine the desired trade-off between its parameters. The proposed two-stage S-band LNA was deployed on an Arlon DiClad527 using a bipolar junction transistor (BJT), type BFP420. Meanwhile, to achieve impedances that match the two-stage S-band LNA circuit, microstrip lines were employed at the input port, the interstage, and the output port. Experimental characterization showed that the realized two-stage S-band LNA produced a gain of 22.77 dB and a noise figure of 3.58 dB at a frequency of 3 GHz. These results were 6.1 dB lower than the simulated gain and 0.76 dB higher than the simulated noise figure respectively.

2014 International Symposium on Antennas and Propagation Conference Proceedings, 2014

In this paper, the square spiral resonator (SR) as a metamaterial planar-antenna with electromagn... more In this paper, the square spiral resonator (SR) as a metamaterial planar-antenna with electromagnetically coupled (EMC) feed is proposed. The proposed antenna will be operated at the frequency range of 2.4-2.5 GHz. To define the dimensional parametrics of the proposed antenna such as the spiral turn number (N), strip width (w), and gap width (s), it is simulated. The highest gain obtained is-0.5 dB at the frequency of 2.43 GHz by using dimensional parametrics of N=3; w=3.1mm; and s=0.5mm.