| Titre : | Impact of Antenna Position on the Performance of Microwave Brain Imaging for Medical Diagnosis |
| Auteurs : | AMEUR Fatima Zohra, Auteur ; BRAHIMI Nihad, Auteur ; MANSOURI Boualam, Directeur de thèse |
| Type de document : | texte manuscrit |
| Editeur : | Université de Saïda – Dr. Moulay Tahar – Faculté des Mathématiques, de l’Informatique et des Télécommunications, 2025/2026 |
| Format : | 33 |
| Accompagnement : | CD |
| Note générale : |
This thesis investigated the impact of antenna position on the perfor-
mance of microwave brain imaging for medical diagnosis. The work fo- cused on a compact antipodal Vivaldi antenna because this antenna fam- ily provides wide bandwidth, directional radiation, compact geometry, and good suitability for near-field biomedical imaging. The first chapter presented the physical basis of microwave brain imaging, including propagation in biological tissues, dielectric contrast, scattering, and safety constraints. The second chapter introduced the Vi- valdi antenna and explained its geometry, operating principle, substrate selection, and reflection-coefficient behaviour. The third chapter pre- sented the final simulation results and analysed the effect of antenna- to-head distance and corrugation geometry. The main conclusion is that antenna position strongly influences both electromagnetic performance and biomedical safety. At D = 1 cm, the antenna is strongly coupled to the head but suffers from stronger loading, reverberation, and SAR constraints. At D = 4.5 cm, the antenna is less perturbed but the useful signal is weaker. The intermediate distance D = 2 cm provides the best compromise between coupling, penetration, safety, and reflected-signal clarity. The corrugation optimization confirmed that the parameters a = 0.5 mm and d = 0.5 mm reduce reverberation while preserving wideband behaviour. Future work should include experimental validation with a physical head phantom, realistic heterogeneous head models, multi-antenna array anal- ysis, and advanced image-reconstruction algorithms for anomaly localiza- tion. |
| Langues: | Français |
| Index. décimale : | BUC-M 008578 |
| Catégories : |
Master's Degree in Telecommunications Specialty: Systems of Telecommunications |
| Mots-clés: | imagerie cérébrale par micro-ondes ; antenne Vivaldi ; an- tenne ultra large bande ; positionnement d’antenne ; SAR ; signal réfléchi. microwave brain imaging ; Vivaldi antenna ; ultra-wideband antenna ; antenna positioning ; reflected signal ; biomedical imaging. |
| Résumé : |
L’imagerie cérébrale par micro-ondes est une technique non ionisante
prometteuse pour la détection d’anomalies neurologiques telles que les AVC, les hémorragies et les tumeurs cérébrales. Ce mémoire étudie l’influence de la position de l’antenne sur les performances d’une an- tenne Vivaldi antipodale compacte destinée à l’imagerie cérébrale par micro-ondes. Les résultats montrent que la distance D = 1 cm fournit un couplage fort mais augmente la réverbération et les contraintes de SAR, tandis que D = 4.5 cm affaiblit le signal utile reçu. La distance intermédi- aire D = 2 cm représente le meilleur compromis entre qualité du signal et sécurité. L’optimisation des corrugations latérales avec a = 0.5 mm et d = 0.5 mm réduit également la réverbération tout en conservant le comportement large bande de l’antenne. Medical microwave brain imaging is an emerging non-ionizing technique for detecting neurological abnormalities such as stroke, haemorrhage, and brain tumours. This thesis studies the influence of antenna posi- tion on the performance of a compact antipodal Vivaldi antenna used for microwave brain imaging. Different antenna-to-head distances are anal- ysed using full-wave electromagnetic simulation. The results show that D = 1 cm provides strong coupling but causes higher reverberation and stricter SAR constraints, while D = 4.5 cm weakens the useful received signal. The intermediate distance D = 2 cm provides the best compromise between signal quality and safety. The study also shows that optimized side corrugations with a = 0.5 mm and d = 0.5 mm reduce reverberation while maintaining wideband behaviour. |
Exemplaires
| Code-barres | Cote | Support | Localisation | Section | Disponibilité |
|---|---|---|---|---|---|
| aucun exemplaire |
Documents numériques (1)
BUC-M 008578 Adobe Acrobat PDF |
