Dr. Senad Bulja, PhD, FIET, SMIEEE

  • Home
  • Researches
  • Workshops
  • Patents
  • Products
  • Tutorials
  • Solutions
  • Services

Researches

Home » Researches » Finite element analysis of a balanced microstrip line filled with nematic liquid crystal

Finite element analysis of a balanced microstrip line filled with nematic liquid crystal

Dr. Senad Bulja 13/02/2023Download Here

The interest in the millimeter-wave band has been renewed recently, driven by the need for short-range high-speed data communications equipment. There is demand for compact and low-cost components, that are mass producible and have low power consumption. It is desirable for these systems to be reconfigurable in order to ensure continuity in data transmission. Nematic Liquid Crystal (LC) materials possess a birefringence that extends into the microwave range. Low voltages can be used to control this birefringence, making these materials an attractive modulation medium in such systems. 

Very few LC mixtures have been characterized at milli-meter wave frequencies. The conventional optical methods are very often impractical due to the need for large cell thicknesses, which lead to oversimplification resulting in inaccurate characterisation. 

 

We take a comprehensive approach in modeling both the liquid crystal orientation and the microwave fields, using a Finite Element Method (FEM) approach on a balanced microstrip line, i.e. the case when the width of the ground plane is the same the width of the strip line. Simulation tools have been developed to aid in the characterization of liquid crystalline materials at millimetre-wave frequencies. Firstly, the steady-state liquid crystal orientation is calculated, switched by a low frequency voltage waveform applied to the electrodes. Secondly, the resulting permittivity distribution is passed to a modal solver that is used to calculate the small signal wave propagation in the line at millimetre-wave frequencies. The finite element method has been used to solve the equations involved. The frequency dependence of the effective permittivity has been calculated as the voltage applied to electrodes is altered.

Fig. 1. Director field with 1V applied, where the director color represents the tilt angle (left) and Director field with 5V applied, where the director color represents the tilt angle (right)
Fig. 1. Director field with 1V applied, where the director color represents the tilt angle (left) and Director field with 5V applied, where the director color represents the tilt angle (right)

 

You may consider: Finite element method liquid crystals

Chia sẻ98
Tweet
Chia sẻ

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Other Posts

Fig. 1. Equipotential lines and director field with 5 V applied. Directors are represented by cylinders. Inset displays the lower right-hand electrode edge in more detail.

Accurate modelling for the wideband characterisation of nematic liquid crystals for microwave applications

Fig. 1 Perspective view of the structure of measurement LC cell

Characterisation and application of nematic liquid crystals in microwave devices

In-Vessel Resonant Communications

Profile & Bio

Senad Bulja, Ph.D., FIET, SMIEEE 

  1. Dr Bulja’s profile
  2. Email : contact@drbulja.com

PROFESSIONAL Profile

  • Accomplished career of over 19 years demonstrating consistent success as a Researcher, Leader and Mentor in the Wireless industry research environment.
  • Excellent Scientific contributions in the field of RF, EMC and telecommunications with 4 Nature Journal publications and over 70 peer-reviewed articles and conference papers
  • Strong leadership skills demonstrated by leading Ph.D. level educated cross-continental and cross-departmental teams to successful project execution.  
  • Proven Strategic Business Impact – introduced own developed technology into Nokia’s future technology roadmap (RF filters) and business transfer of the smart surface technology. 
  • Creative, internationally awarded and well-driven inventor with over 70 filed patents in the area of hardware for Radio Frequency (RF), Wireless Sensor Networks (WSN), Internet of Things (IoT) and wireless systems architectures. E.g. Nokia patent award entitled: “A top inventor in implementation patent first filings”, 2020.
  • Significant contribution in the identification of high revenue IP assets and leadership on the creation of Nokia’s patent portfolio roadmap. 
 

© Copyright 2023 drbulja.com. All Rights reserved