Alfiana, Amalia Nur Alfiana (2026) Analisis Kinerja Absorbansi Susunan Absorber Piramida Berlapis Grafit-Fe untuk Aplikasi Electromagnetic Anechoic Chamber. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Electromagnetic Anechoic Chamber (EAC) memerlukan material absorber yang mampu meredam pantulan gelombang elektromagnetik secara efektif. Namun, tingginya biaya material absorber komersial mendorong pengembangan material alternatif yang lebih ekonomis tanpa mengurangi performanya. Penelitian ini bertujuan mengevaluasi pengaruh pelapisan komposit grafit-Fe terhadap kinerja absorber piramida melalui analisis parameter S12 dan absorbansi. Metode yang digunakan adalah eksperimen laboratorium menggunakan absorber piramida berbahan kardus dengan tinggi 14 cm dan 22 cm. Sampel dilapisi grafit-Fe, kemudian dikarakterisasi menggunakan Vector Network Analyzer (VNA) pada rentang frekuensi 0,3–18 GHz. Nilai absorbansi dihitung berdasarkan hasil pengukuran parameter S12 untuk mengevaluasi perubahan kemampuan penyerapan gelombang elektromagnetik akibat pelapisan. Hasil pengujian menunjukkan bahwa pelapisan grafit-Fe menurunkan nilai S12 dan meningkatkan absorbansi pada kedua variasi absorber. Peningkatan paling konsisten diperoleh pada piramida tinggi 14 cm, dengan absorbansi rata-rata meningkat dari 18,19% menjadi 43,55% pada UHF-S Band, dari 20,81% menjadi 75,09% pada X Band, serta dari 48,36% menjadi 62,51% pada Ku Band. Pada piramida tinggi 22 cm, peningkatan terbesar terjadi pada C Band, yaitu dari 25,43% menjadi 71,05%, sedangkan peningkatan pada X Band dan Ku Band relatif lebih kecil. Hasil tersebut menunjukkan bahwa pelapisan grafit-Fe efektif meningkatkan kemampuan penyerapan gelombang elektromagnetik, dengan konfigurasi piramida tinggi 14 cm memberikan performa paling optimum.
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Electromagnetic Anechoic Chambers (EAC) require absorber materials that effectively suppress electromagnetic wave reflections. However, the high cost of commercial absorbers has driven the development of more cost-effective alternatives without compromising performance. This study investigates the effect of a graphite–Fe composite coating on the electromagnetic wave absorption performance of pyramidal absorbers. An experimental approach was employed using cardboard pyramidal absorbers with heights of 14 cm and 22 cm. The absorbers were coated with a graphite–Fe composite and characterized using a Vector Network Analyzer (VNA) over a frequency range of 0.3–18 GHz. The S12 parameter was measured, and the corresponding absorptance was calculated to evaluate the effect of the coating on electromagnetic wave absorption. The results show that the graphite–Fe coating reduced the S12 parameter and improved the absorptance of both absorber configurations. The 14 cm pyramidal absorber exhibited the most consistent improvement, with average absorptance increasing from 18.19% to 43.55% in the UHF–S Band, from 20.81% to 75.09% in the X Band, and from 48.36% to 62.51% in the Ku Band. For the 22 cm pyramidal absorber, the largest improvement was observed in the C Band, where the average absorptance increased from 25.43% to 71.05%, while improvements in the X and Ku Bands were less pronounced. Overall, the graphite–Fe coating effectively enhanced electromagnetic wave absorption, with the 14 cm pyramidal absorber demonstrating the best overall performance.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Absorbansi, Absorber Piramida, Electromagnetic Anechoic Chamber, Gelombang Mikro, Grafit-Fe, Absorbance, Pyramidal Absorber, Electromagnetic Anechoic Chamber, Electromagnetic Wave, Grafite-Fe |
| Subjects: | Q Science > QC Physics > QC1 Dielectrics Q Science > QC Physics > QC100.5 Measuring instruments (General) Q Science > QC Physics > QC162 Adsorption and absorption Q Science > QC Physics > QC765 Magnetic materials Q Science > QC Physics > QC766.F3 Ferrites |
| Divisions: | Faculty of Mathematics and Science > Physics > 45201-(S1) Undergraduate Thesis |
| Depositing User: | Amalia Nur Alfiana |
| Date Deposited: | 28 Jul 2026 03:56 |
| Last Modified: | 28 Jul 2026 03:56 |
| URI: | http://repository.its.ac.id/id/eprint/138539 |
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