A new model for transmission line modelling (TLM) method to investigate frequency-dependent bioelectromagnetic interactions

Abstract

In this article, a new transmission line model is presented for frequency-dependent analysis of bioelectromagnetic interactions. For the frequency-dependent analysis, the transmission line is modelled with dependent voltage sources in PSpice, allowing the transmission line lumped parameters to be defined as functions of frequency. This approach enables frequency-dependent analysis with a single simulation. As an example, the frequency-dependent electric field distribution in a multilayer human tissue model for the frequency range of 1 GHz and 100 GHz is investigated. The multilayer tissue model consists of skin, fat, and muscle layers. A finite element method (FEM)-based analysis of the electric field distribution in the multilayer tissue model is also conducted at the resonant frequency of the model, determined in this study to be 10.44 GHz. The TLM and FEM-based results are in good accordance. Additionally, the skin depth of the multilayer tissue model is calculated. The results from both the electric field distribution analysis and the skin depth calculation confirm the accuracy of the proposed frequency-dependent transmission line model. Finally, the study examines the frequency-dependent electromagnetic energy absorption in the multilayer tissue model across the 1 GHz to 100 GHz frequency range.

Keywords

• TLM
• skin depth
• SAR

İletim hattı modelleme (İHM) yöntemi ile frekansa bağlı biyoelektromanyetik etkileşim için yeni bir model tasarımı

Abstract

Bu makalede biyoelektromanyetik etkileşimlerin frekansa bağlı analizi için yeni bir iletim hattı modeli sunulmaktadır. Frekansa bağlı analiz için iletim hattı, PSpice programında bağımlı voltaj kaynaklarıyla modellenerek iletim hattı toplu parametrelerinin frekansa bağlı fonksiyonlar olarak tanımlanmıştır. Bu yaklaşım ile tek bir simülasyonla frekansa bağlı analiz gerçekleştirilebilir. Örnek olarak çok katmanlı bir insan doku modelinde 1 GHz ile 100 GHz frekans aralığı için frekansa bağlı elektrik alan dağılımı incelenmiştir. Çok katmanlı doku modeli deri, yağ ve kas katmanlarından oluşmaktadır. Yapılan analizde modelin rezonans frekansı 10,44 GHz olarak belirlenmiştir. Bu frekans için sonlu elemanlar yöntemi ile analiz gerçekleştirilmiştir. İletim hattı modelleme ve sonlu eleman yöntemleri ile elde edilen sonuçlar oldukça uyumlu olduğu gözlemlenmiştir. Ayrıca çok katmanlı doku modelinde deri kalınlığı hesaplanmıştır. Simülasyondan ve hesaplamadan elde edilen deri kalınlığı değerleri birbiriyle uyumlu olduğu gözlemlenmiştir. Bu da önerilen iletim hattı modelinin başarımını göstermektedir. Son olarak çalışma, 1 GHz ila 100 GHz frekans aralığında çok katmanlı doku modelinde frekansa bağlı elektromanyetik enerji emilimini incelenmiştir.

Keywords

• İHM
• deri kalınlığı
• ÖSO

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