A Miniaturized Wide-Band Sinuous Antenna for Microwave Brain Imaging Systems

Salimitorkamani M., Mehranpour M., ODABAŞI H.

IEEE Transactions on Antennas and Propagation, cilt.72, sa.3, ss.2228-2240, 2024 (SCI-Expanded, Scopus)

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 72 Sayı: 3
  • Basım Tarihi: 2024
  • Doi Numarası: 10.1109/tap.2024.3355232
  • Dergi Adı: IEEE Transactions on Antennas and Propagation
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Applied Science & Technology Source, Business Source Elite, Business Source Premier, Communication Abstracts, Compendex, Computer & Applied Sciences, INSPEC, Metadex, zbMATH, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.2228-2240
  • Anahtar Kelimeler: Brain stroke imaging, cavity-backed antenna, microwave imaging (MWI), sinuous antenna, via holes
  • Eskişehir Osmangazi Üniversitesi Adresli: Evet

Özet

In this paper, a broadband, miniaturized cavity-backed Sinuous antenna is presented to be utilized as an array element for microwave brain imaging systems. The proposed antenna consists of a sinusoidal radiating patch printed on an FR4 substrate, three-strip rings on the back side, and a balun built on a Rogers 4003 substrate. The radiating section of the antenna is immersed inside a medium with a relative permittivity of ϵr= 40 and a conductivity of 0.55 S/m to improve the matching between the antenna and the brain tissues. The broadband characteristic of the antenna is achieved by connecting the radiating patch to the backside strip rings with three pairs of shorting vias. The first pair of via holes creates additional frequency resonances at 2.55 GHz and 3.45 GHz; by plugging the second one of via holes, the lower and higher bands of frequency response in the antenna are improved at 1.95 and 3.7 GHz, respectively. Finally, by combining the previous pair of via holes and the third one of via holes, additional frequency resonances at 1.88, 2.39, 2.8, and 3.41 GHz extend the operational bandwidth of the antenna from 1.75 GHz to 4 GHz. The radiating section of the antenna has a compact diameter of 0.16λ where λ is the minimum frequency of the operating band range of the antenna. Furthermore, the radiation characteristics of the proposed antenna were analyzed and studied near the Hugo head model, ensuring that it meets the necessary criteria for microwave imaging systems. The suitable and well-matched simulated and measured antenna characteristics results show that the proposed antenna can be a good candidate for brain imaging applications.