Amanaf, Muntaqo Alfin (2026) Pengembangan Antena Printed Monopole Pada Konfigurasi Circular Array Untuk Aplikasi Microwave Breast Imaging. Doctoral thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Microwave imaging merupakan inovasi teknologi yang menawarkan metode deteksi tumor payudara yang lebih aman, akurat, dan fleksibel dibandingkan metode mammografi konvensional. Sistem ini bekerja menggunakan antena untuk mendeteksi perbedaan sifat dielektrik antara jaringan payudara normal dan jaringan tumor melalui transmisi gelombang mikro ke dalam jaringan payudara. Pada implementasinya, sistem microwave imaging memerlukan antena dengan bandwidth yang lebar, gain yang tinggi, serta mutual coupling yang rendah agar mampu menghasilkan kualitas pencitraan yang optimal. Untuk memenuhi kebutuhan bandwidth dan gain tersebut, penelitian ini mengembangkan beberapa metode optimasi antena, yaitu corner etching, partial ground, dan penambahan shorting pin. Hasil penelitian menunjukkan bahwa kombinasi metode tersebut mampu meningkatkan performansi antena dengan bandwidth mencapai 5,72 GHz, gain sebesar 4,84 dBi, serta front-to-back ratio (FBR) sebesar 9,21 dBi. Peningkatan parameter tersebut menunjukkan bahwa antena yang dikembangkan memiliki kemampuan radiasi yang lebih baik untuk aplikasi microwave breast imaging. Penelitian terkait kebutuhan mutual coupling yang rendah pada konfigurasi circular array 1 × 8 antena printed monopole dilakukan dengan penambahan Electromagnetic Band Gap (EBG) berbentuk Z dan kombinasi dengan via dan ZEBG. Pada struktur Printed Monopole Antenna Z-shaped EBG (PMA-ZEBG), nilai mutual coupling berhasil diturunkan hingga −32 dB. Selanjutnya, dengan penambahan kombinasi EBG dan via pada struktur Printed Monopole Antenna Via−loaded Z−shaped EBG (PMA-VZEBG), nilai mutual coupling dapat ditekan lebih rendah hingga mencapai −42,54 dB. Sebagai pembuktian konsep (proof-of-concept), dilakukan eksperimen pencitraan menggunakan phantom payudara dan algoritma Delay-and-Sum (DAS). Hasil eksperimen menunjukkan bahwa pengurangan mutual coupling memberikan dampak positif terhadap performansi pencitraan microwave, dengan localization error sebesar 1,2 mm dan contrast-to-noise ratio (CNR) sebesar 3,85. Hasil tersebut menunjukkan bahwa sistem antena yang dikembangkan mampu meningkatkan akurasi lokalisasi tumor pada aplikasi deteksi tumor payudara berbasis microwave imaging.
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Microwave imaging is an emerging technology that offers a safer, more accurate, and more flexible approach to breast cancer detection compared with conventional mammography. This system operates by using antennas to detect differences in the dielectric properties between healthy breast tissue and cancerous tissue through the transmission of microwave signals into the breast. In practical implementations, microwave imaging systems require antennas with wide bandwidth, high gain, and low mutual coupling to achieve optimal imaging performance. To fulfill the bandwidth and gain requirements, this research developed several antenna optimization techniques, including corner etching, partial ground implementation, and the addition of a shorting pin. The results demonstrate that the combination of these techniques significantly enhances antenna performance, achieving a bandwidth of 5,72 GHz, a gain of 4,84 dBi, and a front-to-back ratio (FBR) of 9,21 dB. These improvements indicate that the proposed antenna exhibits superior radiation characteristics for microwave breast imaging applications. To address the requirement for low mutual coupling in a 1 × 8 circular array configuration of printed monopole antennas, this study further investigates the incorporation of a Z-shaped Electromagnetic Band Gap (EBG) structure and its combination with vias. In the Printed Monopole Antenna with Z-shaped EBG (PMA-ZEBG), the mutual coupling was successfully reduced to −32 dB. Furthermore, by integrating both EBG and via structures in the Printed Monopole Antenna with Via-Loaded Z-shaped EBG (PMA-VZEBG), the mutual coupling was further suppressed to as low as −42,54 dB. As a proof of concept, imaging experiments were conducted using a breast phantom and the Delay-and-Sum (DAS) imaging algorithm. The experimental results demonstrate that reducing mutual coupling has a positive impact on microwave imaging performance, achieving a localization error of 1,2 mm and a contrast-to-noise ratio (CNR) of 3,85. These findings indicate that the proposed antenna system can significantly improve tumor localization accuracy in microwave-based breast cancer detection applications.
| Item Type: | Thesis (Doctoral) |
|---|---|
| Uncontrolled Keywords: | circular array, microwave imaging, mutual coupling, printed monopole |
| Subjects: | Q Science > QR Microbiology > QR 201.T84 Tumors. Cancer T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7871.6 Antennas (Electronics) T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7872 Electromagnetic Devices |
| Divisions: | Faculty of Electrical Technology > Electrical Engineering > 20001-(S3) PhD Thesis |
| Depositing User: | Muntaqo Alfin Amanaf |
| Date Deposited: | 04 Aug 2026 01:09 |
| Last Modified: | 04 Aug 2026 01:09 |
| URI: | http://repository.its.ac.id/id/eprint/142791 |
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