Design and simulation of a bandpass filter using metamaterial

مقدم أطروحة جامعية

Hatim, Layth Nayif

مشرف أطروحة جامعية

Rasul, Jamal Muhammad

الجامعة

الجامعة التكنولوجية

الكلية

-

القسم الأكاديمي

قسم الهندسة الكهربائية

دولة الجامعة

العراق

الدرجة العلمية

ماجستير

تاريخ الدرجة العلمية

2013

الملخص الإنجليزي

During recent years many microstrip filter types have been used in radar and mobile systems, this work has been concerned on the microstrip bandpass filter because it is compact size, narrow bandwidth, and sharp stop band related to other microstrip filters such as low pass and high pass filters.

This thesis presents to design microstrip bandpass filter using a Split-Ring Resonators which are widely used to simulate metamaterial elements.

Such elements are arranged uniformly in a periodic configuration and behave as artificial materials with unusual properties, the structure is optimized to satisfy the operating frequency in the C-Band and X-Band.

The proposed bandpass filter consisted of microstrip wire resonator by using copper material with thickness= 0.035mm which designed firstly without metamaterial , the substrate type Rogers RT/duriod 5880 used, with εr=2.2, μr =1, dielectric loss tangent=0.0009, thickness= 0.508mm, and impedance matching 50Ω.

The obtained simulation results are, Center Frequency 11.3GHz, bandwidth˂50MHz, Return loss S11˃-10dB, Insertion loss S21 ˃-3dB.

These results need to improve its parameters, to satisfy the design parameters, the SRRs metamaterial etched must be used on the ground plane and a microstrip line on the top plane of the substrate to obtain a strong electric coupling with the desired polarization waves.

To show the effect of the metamaterial structure on the conventional microstrip bandpass filter, the SRRs metamaterial structure unit cell with different dimensions are used with microstrip BPF, the simulation results of the magnitude and phase of the computed S-parameters which satisfy the operating frequency (8.8)GHz, (7.6)GHz and (5.5)GHz respectively, and improved the reflection coefficient, transmission coefficient and bandwidth, S11˂ -10 dB, S21 at zero dB and bandwidth(from 50 to 100)MHz.

Also shows the dip in phase of transmission coefficient indicates to presence the negative frequency region in the same resonance region.

After obtaining the unit cell structure with the optimized relevant component dimensions, the array of unit cell is designed for the target working frequency in the C-and x- band.

Using the optimized unit cell structure, it is then being duplicated to form 1x3 array.

The unit cell is positioned close together with S= 0.5mm separations between each unit cell to give rise to the periodic structure of the metamaterial.

The simulation results of the magnitude and phase of the computed S-parameters which show the magnitude of reflection coefficient improved S21˂-20dB, -28dB, -18dB and the operating frequency 8.8GHz, 7.2GHz, 5.5GHz respectively.

Also the dip in phase of S21 indicates the presence of a negative index band which satisfy the theory for backward wave material.

Also the bandwidth is optimized to be doubled, and get a dual resonance frequency using metamaterial array.

Finite element method has been carried out to evaluate the performance of the microstrip bandpass filter with metamaterial using Ansoft HFSS.

التخصصات الرئيسية

الهندسة الكهربائية

• APA
• MLA
• AMA

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-418074