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Publications (79)
Batu City, which is famous as a tourist city, is not only an urban area. Most of the Batu city area is a rural area, especially the northern area which is included in the Bumiaji sub-district. As a tourist area, Batu City has a large enough economic potential to improve the welfare of its people. Most of the people of Batu city who live in rural ar...
One way to improve the efficiency of antenna design is to use mathematical models. The polygonal antenna model is a mathematical model for designing antennas with a polygonal structure. This article explains the application of the bi-polygon antenna model to account for the frequency shift of the micro-strip antenna due to changes in the design of...
Optika merupakan salah satu topik dalam pelajaran IPA yang diajarkan di SMP/MTs. Pada topik ini, kebanyakan siswa-siswa SMP/MTS mengalami kesulitan dalam hal pemahaman konsep tentang optika terutama pada bagian optika fisis. Ada beberapa faktor yang menjadi penyebabnya. Salah satu faktor tersebut adalah keketerbatasan fasilitas dan pengetahuan guru...
A folded dipole antenna is made with a microstrip structure that can work at a frequency of 9.02 GHz. This frequency is located in the Super High Frequency (SHF) region. It consists of copper and FR-4. A Reconfigurable folded dipole antenna is made by installing photodiodes on the right and left sides. This photodiode is irradiated with 808 nm, 200...
Pendidikan mempunyai peran yang amat penting dalam meningkatkan kualitas sumber daya manusia Indonesia. Adanya pandemi Covid 19, telah membuka mata semua pihak bahwa pendidikan di Indonesia masih banyak yang harus dibenahi. Ketidaksiapan infrastruktur sekolah membuat proses pembelajaran jarak jauh yang ditetapkan oleh pemerintah menciptakan beberap...
In this paper, Design Coplanar Waveguide (CPW) ring fed shaped G antenna multiband for wireless applicationsis presented and discussed. Dielectric substrate material (FR4) with a relative permittivity value of 4.3, loss tangent 0.02,thickness 1.6 mm was used as a substrate material in the antenna design. 50-ohm microstrip feed line characteristicim...
A folded dipole antenna with a microstrip structure is designed in the super high frequency (SHF) range with a size of 15 × 3.1 × 0.03 mm. Then, a photodiode was installed and irradiated with infrared 808 nm, 200 mW on it. Based on the measurement results using a vector network analyzer (VNA), there was a change in frequency from 13.86 to 14.85 GHz...
In wireless communication technology, antennas of folded dipole have been used very often. In this study, a folded dipole antenna is proposed using the Finite Difference Time Domain (FDTD) method, which can work on the SHF spectrum. So, it can be applied to wireless communication tools. The folded dipole antenna is designed using copper material wi...
The folded dipole microstrip antenna has been designed to increase the operating frequency and stabilize the radiation pattern. In addition, this type of antenna has small size, is lightweight, and can operate at higher frequency. So, it can be applicated in microwave devices/communications. In this study, there are three types of folded dipole mic...
Penulisan karya tulis dan karya ilmiah di bidang pendidikan merupakan salah satu bentuk pengembangan profesi dari seorang guru yang dapat berkontribusi pada peningkatan mutu pendidikan dalam proses belajar mengajar. Namun jumlah karya ilmiah yang dihasilkan oleh keprofesian guru masih berada di angka yang rendah. Salah satu kesulitan penulisan kary...
p>The development of axial-flux permanent-magnet (AFPM) machines has become a mature technology. The single-stator double-rotor (SSDR) AFPM structure has advantages on the compactness and the low up to medium power applications so the microscale size and low-cost applications are reachable to be designed. The research main objectives are designing...
The increasing use of mobile phones has improved the quality of devices on mobile phones so that mobile phones can be of good quality. One of the devices on mobile phones that are needed to be improved is the antenna. The antenna is one key component of mobile phones. Various types of antennas had designed and developed. One of them is a microstrip...
Bi-quad antennas have been widely used mainly as wideband antennas. Recent developments have shown the use of bi-circular antennas in addition to bi-quad antennas. These two types of antenna designs are bi-polygonal antenna designs that differ in their geometry. This paper presents the results of experimental and theoretical studies related to bi-q...
A process for fabricating fully integrated optical devices based on tin oxide material using a laser cutting method had been conducted. This study was able to create optical waveguide channels in a flexible and fast way using the method. The study also demonstrated that the laser cutting process was capable of fabricating a Y-double branch optical...
This paper presents the designed of varians array in curved microstripline antenna for radar communication. The antenna geometry comprises of three varians in matrics 2x2, 2x4 and 4x4 dimensions. The several array operates in C-Band frequencies (4GHz – 8GHz) and X-Band frequencies (8GHz-12GHz) with a 1.82 VSWR, -18.72dB Return loss, 0.29 reflection...
In this study, we present an investigation of uncladded fiber bragg grating (FBG) as a chemical sensor towards glucose in aqueous solution with various concentration from 0 – 60 wt%.The measurement system consists of deuterium-halogen lamp as light source, uncladded fiber bragg gratings that have been etched with nitric acid (HNO 3 ) as sensing ele...
In this study, we present an investigation of uncladded fiber bragg grating (FBG) as a chemical sensor towards glucose in an aqueous solution with various concentrations from 0-60 wt%. Uncladded fiber bragg gratings have been etched with nitric acid (HNO3) therefore acting as a sensing element. Two measurement methods consisting of optical spectrum...
A 250 nm thick pure tin film was deposited on quartz substrates by vacuum evaporation of 99.9% pure tin metal. The films were heated in a two-step annealing sequence for 3 h at 200 and 3 h at 400 °C with an electric furnace to decrease their surface roughness. This process transformed the films into tin(II) oxide. Subsequently, the films were annea...
Plastic optical fiber (POF) FD 620 10 has been widely used in various sensors with the basic principle of utilizing the intensity received because of reflection, one of which is used as a displacement sensor. In this study, POF was used as a directional coupler and was applied for the detection of the refractive index of sodium chloride (NaCl) solu...
Thin films are developed for multi-purposes, such as optical waveguides, corrosion resistant coating, car tinting, and glass coatings. Each thin film is created and designed with a specific purpose and function. The purpose of this research was to fabrication anti-reflective films on glass Indium Tin Oxide (ITO) usually used as an electrode in Dye-...
The demand for a non-invasive, fast, and accurate glucose detection for diabetic patients is increasing nowadays. It is predicted that diabetic patient will increase from 415 million people at 2018 to 640 million people at 2050. Glucose is also present in saliva, therefore glucose concentration measurement in saliva can be an alternative way during...
We demonstrated optical power splitter using SnO2 nanoparticles as the core material in double Y-branch waveguide geometry. SnO2 is a nonlinear optical material that has been largely used in various photonics applications like LED, optical logic gates, optical sensors, and saturable absorbers. The SnO2 nanoparticles are injected into optical wavegu...
The straight channel optical waveguide coated with the SnO2 nanoparticle is studied as an all-optical humidity sensor. The proposed sensor shows that the transmission loss of the waveguide increases with increasing relative humidity (RH) from 56% to 90% with very good repeatability. The sensitivity to changes in relative humidity is ∼2 dB/% RH. The...
The third generation of solar cells that found by Gratzel in 1991 was called Dye Sensitized Solar Cell (DSSC). DSSC is composed of five parts namely Indium Tin Oxide (ITO) as a substrate; TiO2 and SnO2 nanoparticles as semiconductor materials; natural dyes (chlorophyll alfalfa) as an electron donor; gel electrolyte as electron transfer; active carb...
Nanomaterials TiO2 have been synthesized by the co-precipitation method using T1CI3 precursor and obtained TiO2 powder with the crystal morphology of nanoparticles and nanorods. TiO2/PMMA bilayer film has been prepared by a spin-coating method, with the first layer used PMMA layer for anti-reflection function and microscope slide glass (MSG) is use...
We report on the detailed study of wavelength tunability of passively Q-switched erbium doped fiber laser using Tin(IV) Oxide (SnO2) as saturable absorber (SA). As a typical n-type semiconductor, SnO2 has been widely used in gas sensors, oxidation catalyst, transparent conductor, and electrode materials in solar cell. Herein, we fabricated saturabl...
We demonstrate a passively Q-switched erbium-doped fiber laser using a tin(IV) oxide (SnO2) nanoparticle layer as a saturable absorber. A SnO2 nanoparticle is composited with polyvinyl alcohol (PVA) to form thin saturable absorber film and is sandwiched between fiber ferrules in a ring fiber laser cavity to produce stable, self-started Q-switched l...
In this article, two structures of open-loop dipole microstrip antenna for 2.45 GHz wireless applications were investigated through numerical simulation and experiment. The characteristic impedance of the open-loop was 430 Ω Both microstrip antennas substrate use FR-4 with1.6 mm thickness and 4.3 of relative permittivity. The whole dimensions were...
Antenna characteristics are determined by the physical properties of the antenna material, antenna structure and antenna geometry. Various methods have been developed to obtain antenna characteristics based on the physical properties of antenna materials, structures and geometries of microstrip antennas. These methods can be simulated using a micro...
TiO2/Poly(methyl methacrylate) (PMMA) bilayered films have been prepared by spin coating technique on the glass substrate. The nanorod-structured TiO2 prepared by a coprecipitation method was used. The structure and morphology were tested by X-ray diffraction (XRD), scanning electron microscopy, and atomic force microscopy (AFM). The optical proper...
The slab waveguide TiO 2 nanoparticles by spin-coating method was fabricated with solvent 2-propanol. Component of TiO 2 phase anatase is obtained using the old method of coprecipitation with time stirring 5 h. The Slab waveguide fabrication process using the spin-coating method with a rotation speed of 3000 rpm for 60 s and thermally treated at 10...
Objectives: This paper has proposed the mechanism to enhance antenna performance. The antennas are designed to
be applied in communication devices. Methods/Statistical analysis: The proposed antenna characteristics had been
analyzed by means of Finite Difference Time Domain (FDTD) method and had been fabricated by photolithography method
on FR-4 Pr...
The design, fabrication, and measurement of reconfigurable antenna using photodiode switcheshave been investigated. The antenna had dimension 104 mm x 41 mm x 1.6 mm and FR4 substrate withrelative permittivity 4.8. It structure was Coplanar Stripline (CPS) dipole. Two photodiodes had assembledon gap in both dipole arms, which was activated by 650 n...
The effects of V-shaped angle variation of CPS on the antenna characteristics have been investigated through simulation and experimental results. The dimensions of antenna are 120 mm x 62 mm x 1.6 mm using FR4 material with effective dielectric permittivity of 4.3. The proposed antennas structure is based on a dipole antenna which is configurated l...
According to the fact that the low convergence level on the complete elliptic integral of the first kind for the modulus which having values approach to one. In this paper we propose novelty of the complete elliptic integral consists of the new infinite series. We apply the scheme of iteration by substituting the common modulus with own modulus fun...
Titanium dioxide (titania) nanoparticle were synthesized by coprecipitation process of titanium trichloride (TiCl3) in aqueous medium, with NH4OH as regulator pH. The solution pH varied during the synthesis process between pH 3-8.4, and all samples calcined temperature at 400oC for 3 hours. Characteristics and properties of the TiO2 powder were inv...
The adsorption of basic dye methylene blue (MB) onto titanium dioxide (titania) powder that were prepared by coprecipitation method of TiCl3 and NH4OH as iniatial material with different calcination temperature was studied to examine the photocatalytic activity. Synthesis process carried out by the solution pH was adjusted to be 8. Effect of calcin...
Preparation of TiO2 film using the spin coating method has been done. Characterization Optical of TiO2 film using UV-Vis spectrophotometer that measured in the wavelength range 200-1000 nm. From the results of these characterization methods used tauc plot and obtained values of optical energy gap and the known absorption maximum of the Uv-vis range...
Universal steering vector (USV) is applied to estimate directional of arrival (DOA) using multiple signal classification (MUSIC) algorithm. The USV that includes effect of mutual coupling can be used in searching peak spectrum directly without compensation of the mutual coupling. The linear patch antenna is used as DOA receiving antenna for estimat...
Abstrak Antena adalah salah satu bagian dalam sistem komunikasi yang berfungsi sebagai pemancar dan penerima suatu sinyal komunikasi berupa gelombang elektromagnetik. Pada penelitian ini dilakukan simulasi antena microstrip berbentuk segi empat dengan bahan FR4 dimana ketebalan substratnya 1.6 mm dan r = 4.6. Simulasi dilakukan dengan memberikan...
Design, fabrication, and characterization prototype of reconfigurable dipole microstrip antenna using photodiode as optical switching have been conducted in the Laboratory for Optical and Microwave Physics Department Faculty of ITS. This paper presents a new reconfigurable antenna design using photodiode as optical switching. In order to be optical...
In this paper, design of ultra wide-band antenna for radar application has been proposed. The antenna consists of circular patch and partial ground plane on the adjacent side. The proposed antenna is designed in FR-4 substrate which has 1.6 mm thick and 4.6 relative permittivity value. The dimension of the substrate is 42 mm x 50 mm x 1.6 mm. Groun...
In this paper, design, fabrication, and characterization new tunable microstrip antenna using photodiode as optical switching has been proposed. The proposed antenna is fabricated in FR-4 substrate 4.8 relative permittivity value. The dimension of the substrate is 47 mm × 75 mm × 1.6 mm. The measurement result indicates that, if photodiode unillumi...
A 1 x 3 power splitter devices have been fabricated by using polymer materials and this are characterized
by the simulation methods Finite Difference Beam Propagation Method (FD-BPM). Simulations carried out
by applying the phenomena Multimode interference (MMI). Channel waveguides were fabricated by polymer
material, substrate chosen to be acrylic...
In this paper, design of planar antenna for Wide-Band applications has been proposed. The antenna consists of E patch structure and partial ground plane on the adjacent side. The proposed antenna is designed in FR-4 substrate which has 1.6 mm thick and 4.6 relative permittivity value. The dimension of the substrate is 50 mm × 80mm × 1,6mm. The prop...
Double Bowtie Microstrip slot antenna 3 array using coplanar waveguide have been fabricated and characterized with FR4 substrate material. The parameter structure of antenna must be fixed to have a matching impedance with 50 ohm and operated on 2.4 GHz of resonance frequency. The dimension of the whole panel antenna is 250 × 170 mm, it is consisti...
Prototype of double Bow-Tie microstrip slot antenna triple array using input of coplanar waveguide have been fabricated and characterized. Design of microstrip with the dielectric constant is 4.3 from FR4 substrate. The calculation was carried out form the existing data to obtain the form and dimension of antenna which can put hand to the frequency...
Telah dilakukan fabrikasi dan karakterisasi antena microstrip omnidirectional berstruktur array double dipole dengan substrat fiber untuk komunikasi WiFi 2,4 GHz. Fabrikasi dilakukan dengan metode etching dengan larutan feritklorit (FeClO 3), struktur antenna terdiri dari lima larik double dipole yang simetri dengan pola pertama menggunakan strip f...
Antena Mikrostrip Loop Co-Planar Waveguide dua lapis substrat untuk aplikasi komunikasi C-Band dan Ku-Band telah difabrikasi dan karakterisasi. Parameter-parameter fisis yang dikarakterisasi meliputi VSWR (Voltage StandingWave Ratio), return loss, dan impedansi. Substrat yang digunakan untuk fabrikasi antena pada penelitian ini adalah FR4 dengan pe...
Antena Mikrostrip dengan struktur satu feed line dipole Co-Planar Waveguide dan dua patch untuk repeater wifi dua arah telah difabrikasi dan karakterisasi. Parameter-parameter fisis yang dikarakterisasi meliputi VSWR (Voltage Standing Wave Ratio), Return Loss, dan pola radiasi. Substrat yang digunakan untuk fabrikasi antena adalah FR4 dengan permit...
This paper studies the displacement sensor using multimode fiber coupler based on intensity modulation. Fiber coupler used is handmade from plastic optical fiber 1 mm diameter; it has coupling ratio 0.25, excess loss 1.37 dB, and directivity 25 dB. He-Ne laser (632.8 nm) and OPT 101 (Burr Brown) detector is used to detect the change in power-output...
Telah dilakukan eksperimen directional coupler serat optik multimode hasil fabrikasi sendiri sebagai sensor pergeseran mikro berbasis teknik modulasi intensitas dengan teknik yang sederhana. Analisis performansi sensor menggunakan pendekatan berkas Gaussian. Eksperimen menggunakan sumber laser He-Ne (632,8 nm; 1 mW), detektor OPT-101 (Burr Brown) u...
Telah dilakukan fabrikasi directional coupler simetri 2x2 dari bahan serat optik plastik (POF) step-index multimode dengan metode fused. Bahan untuk fabrikasi directional coupler adalah serat optik plastik multimode tipe FD-620-10 dengan diameter serat 1 mm. Fabrikasi dilakukan dengan cara memoles sepasang serat optik dengan panjang daerah interaks...
Optical logic gates for OR-AND-NOT, NOR and exclusive-XNOR operations in waveguides consisting of nonlinear material are numerically investigated by means of FD-BPM (Finite Difference Beam Propagation Method). The proposed devices are designed utilizing the self-routing characteristics of nonlinear X-crossing and Y-branching structures when they ar...
Optical logic gates for OR, AND, NOT, and NOR operations in waveguides consisting of nonlinear material are numerically investigated by means of FD-BPM (Finite Difference Beam Propagation Method). The proposed devices are designed utilizing the self-routing characteristics of nonlinear X-crossing structures when they are operated with one input bea...
Prototype of double Bow-Tie microstrip slot antenna triple array using input of coplanar waveguide have been fabricated and characterized. Design of microstrip with the dielectric constant is 4.3 from FR4 substrate. The calculation was carried out form the existing data to obtain the form and dimension of antenna which can put hand to the frequency...
