FAKHRIIL ANAM KAMIIL, . (2024) PENGARUH MEDAN MAGNET LUAR TERHADAP KEMAMPUAN SERAPAN GELOMBANG MIKRO PADA MATERIAL PASIR BESI. Sarjana thesis, UNIVERSITAS NEGERI JAKARTA.
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Abstract
Penelitian ini bertujuan untuk mengkaji pengaruh medan magnet eksternal terhadap pasir besi sebagai material penyerap gelombang mikro, dengan menggunakan karakterisasi optik, permagraf, dan Vector Network Analyzer (VNA) yang melalui tahap penghalusan dengan metode mekanika milling. Pasir besi dipilih karena sifat magnetiknya yang potensial untuk aplikasi penyerap gelombang mikro. Metode karakterisasi optik digunakan untuk mengamati perubahan struktur dan morfologi permukaan material. Partikel yang dihasilkan cenderung lebih homogen dan memiliki ukuran yang lebih kecil. Pengujian permagraf menunjukkan sifat magnetik pasir besi berupa soft magnetic yang mengakibatkan penurunan nilai magnetisasi dan peningkatan nilai koersivitas material ketika partikel serbuk semakin halus. Sementara itu, VNA digunakan untuk mengukur efisiensi penyerapan gelombang mikro pada rentang frekuensi 7-13 GHz. Hasilnya menunjukkan bahwa medan magnet eksternal dapat mempengaruhi kemampuannya dalam menyerap gelombang mikro. Dengan demikian, penyerapan gelombang mikro yang optimum oleh pasir besi ditemukan pada pasir besi yang telah dihaluskan selama 1 jam. Pengujian tersebut memiliki nilai Reflection Loss (RL) minimum sebesar -8,241 dB dengan bandwidth (< -5 GHz) sebesar 9,816 GHz. Persentase penyerapan gelombang yang tidak dipantulkan (Penyerapan Material + Transmisi) sebesar 80.48% dan yang dipantulkan kembali sebesar 19.52%. Kata kunci: pasir besi, penggilingan, medan magnet eksternal, gelombang mikro ***** FAKHRIIL ANAM KAMIIL. Effect of External Magnetic Field on Microwave Absorption Ability of Iron Sand Material. Physics Study Program, Faculty of Mathematics and Natural Sciences, State University of Jakarta. July 2024. This study aims to examine the effect of external magnetic field on iron sand as a microwave absorbing material, using optical characterization, permagraph, and Vector Network Analyzer (VNA) which goes through the smoothing stage with the milling mechanics method. Iron sand was chosen because of its potential magnetic properties for microwave absorbing applications. Optical characterization methods were used to observe changes in the structure and surface morphology of the material. The resulting particles tend to be more homogeneous and have a smaller size. Permagraph testing shows the magnetic properties of iron sand in the form of soft magnetic which results in a decrease in the magnetization value and an increase in the coercivity value of the material when the powder particles are finer. Meanwhile, VNA was used to measure the microwave absorption efficiency in the frequency range of 7-13 GHz. The results show that the external magnetic field can affect its ability to absorb microwaves. Thus, the optimum microwave absorption by iron sand is found in iron sand that has been pulverized for 1 hour. The test has a minimum Reflection Loss (RL) value of -8.241 dB with a bandwidth (< -5 GHz) of 9.816 GHz. The percentage of wave absorption that is not reflected (Material Absorption + Transmission) is 80.48% and that is reflected back is 19.52%. Keywords: iron sand, milling, external magnetic field, microwave.
Item Type: | Thesis (Sarjana) |
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Additional Information: | 1). Prof. Dr. Erfan Handoko, M.Si 2). Prof. Dr. Mangasi Alion Marpaung, M.Si |
Subjects: | Sains > Fisika |
Divisions: | FMIPA > S1 Fisika |
Depositing User: | Users 24724 not found. |
Date Deposited: | 19 Aug 2024 01:58 |
Last Modified: | 19 Aug 2024 01:58 |
URI: | http://repository.unj.ac.id/id/eprint/50200 |
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