ISM 2.45 GHZ MICROSTRIP IMPLANT ANTENNA DESIGN AND IN-TISSUE MEASUREMENTS

Year 2020, Volume: 8 Issue: 2, 541 - 551, 25.06.2020

Fatih Alper Özlem Coşkun

https://doi.org/10.21923/jesd.688326

Abstract

In this study, a micro-strip implant antenna that can be used in-tissue applications was proposed. Antenna size was designed as 30mm * 28mm * 1.59mm. In the design, a FR4 substrate material was used whose permittivity is 4.3, loss tangent is 0.025 and height is 1.52 mm. The analysis of the implant antenna was simulated in the CST Microwave Studio program. After obtaining the desired performance, a tissue model was created and an implant antenna was placed in the skin tissue. Return loss and SAR value of the designed antenna were measured in the 2.45 GHz ISM band. As a result, return losses were observed as -18 dB and -33 dB and SAR was 153 W / kg inside and outside the tissue respectively. Then, the antenna was manufactured with PCB and a phantom liquid was created that provides the electromagnetic properties of the skin tissue and the antenna was placed in this liquid. Finally, the simulation and experiment results of the designed antenna were evaluated and compared with literature studies. It has been observed that the measurement results in the skin tissue are well aligned with the simulation results.

Keywords

Implant Antenna, In-Tissue Application, Biotelemetry, Microstrip Antennas

ISM 2.45 GHz MİKROŞERİT İMPLANT ANTEN TASARIMI VE DOKU İÇİ ÖLÇÜMLERİ

Abstract

Bu çalışmada doku içi uygulamalar için kullanılabilecek özgün bir mikroşerit implant anten tasarımı önerilmiştir. Anten boyutu 30 mm*28 mm*1.59 mm olarak tasarlanmıştır. Tasarımında dielektrik sabiti 4.3, kayıp tanjantı 0.025 ve yüksekliği 1.52 mm olan FR4 taban malzemesi kullanılmıştır. İmplant antenin analizi CST Microwave Studio programında gerçeklenmiştir. İstenilen değerler elde edildikten sonra ise doku modeli oluşturularak deri doku içerisine implant anten yerleştirilmiştir. Tasarlanan mikroşerit implant antenin ISM bandında 2.45 GHz’de geri dönüş kaybı ve SAR değeri ölçülmüştür. Yapılan ölçümler sonucunda doku içi ve doku dışı sırasıyla geri dönüş kaybı -18 dB ve -33 dB, SAR değeri ise 153 W/kg olarak gözlemlenmiştir. Daha sonra antenin baskı-devre teknolojisi ile gerçeklenmesi yapılıp, deri dokusunun özelliklerini gösteren bir fantom sıvı oluşturulmuş ve anten bu sıvı içine yerleştirilmiştir. Son olarak da tasarımı yapılan antenin simülasyon ve deney sonuçları değerlendirilerek literatürdeki diğer çalışmalarla karşılaştırılması yapılmıştır. Deri dokusu içerisindeki ölçüm sonuçlarının da benzetim sonuçları ile oldukça uyumlu olduğu gözlemlenmiştir.

Keywords

İmplant Anten, Doku İçi Uygulamalar, Biyotelemetri, Mikroşerit Anten

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