Electric Field and Dispersion Characteristic Calculations of Glass Tube Waveguides Filled with Biological Substances

Electronics

Juozas Bučinskas¹  Šarūnas Paulikas²  Darius Plonis³  Liudmila Nickelson³  Andrius Katkevičius³  Darius Miniotas³  Raimondas Pomarnacki³  Romanas Martavičius³ 

[1] Chemical Physics Institute, Vilnius University, Sauletekio str. 9, 10222 Vilnius, Lithuania;Department of Computer Science and Communications Technologies, Vilnius Gediminas Technical University, Naugarduko str. 41, 03227 Vilnius, Lithuania;Department of Electronic Systems, Vilnius Gediminas Technical University, Naugarduko str. 41, 03227 Vilnius, Lithuania;

关键词: microwaves;    blood plasma;    red blood cells;    propagation constant;    electric fields;    waveguides;   

DOI  :  10.3390/electronics8030301

来源: DOAJ

【 摘 要 】

This study presents calculation of dispersion characteristics in the frequency range 1–100 GHz as well as electric field distributions in an open cylindrical waveguide with a central channel. The waveguide is made of glass material. The channel can be either empty or filled with blood plasma or blood cells. We investigated two kinds of electromagnetic (ЕМ) waves, the “tube” and “core” modes, each having a different structure of their electric fields. In the current study, the analysis focused on the fundamental and the first higher hybrid magnetic and electric “tube” modes. The fundamental “tube” mode that propagates in the waveguide filled with blood plasma is characterized by a very small loss at frequencies above 65 GHz. Meanwhile, the first higher mode suffers from strong attenuation in the same frequency range. This calls for finding ways to improve the waveguide’s broad-bandwidth. Our approach involves determining the dependence of this parameter on the inner radius of the waveguide. Extremes of the waveguide’s broad-bandwidth are observed at certain values of its inner radius. When the waveguide is filled with blood plasma or blood cells, the electric fields of the magnetic “tube” mode concentrate around the channel, and the electric field intensity decreases with the propagation of this mode along the waveguide, i.e., with increase of coordinate z. If the channel is filled with blood cells, the electric field of the hybrid magnetic “core” mode is concentrated in the center of the waveguide. This mode is characterized by a large attenuation h”, which reaches 500 m−1 at 30 GHz.

【 授权许可】

Unknown