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Research subject: Determination of Structural Equation for Normal Mode Helical Antenna having
Dielectric or Magnetic Material inside
Presented by : Nguyen Thanh Tuan (First Semester of Master Degree)
Supervisor : Prof. Dr. Yoshihide Yamada
Co-Supervisor : Dr. A.K.M Muzahidul Islam Assoc. Prof. Dr. Sabariah Bt. Baharun
27th March 2015
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Outline of this presentation
1. What is Antenna ?
2. What is Normal Mode Helical Antenna (NMHA) ?
3. Structural Determination Method
4. Study Subject
5. Research Schedule
6. Present Situation
7. Conclusion
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1. What is Antenna ?
Fig 1.Mobile Communication Fig 2.Satellite Communication
• Applications of Antennas:
• Main roles: Transmit and receive radio wave• Important characteristics: Antenna gain, Radiation pattern,
Impedance matching to radio equipments.
AntennaAntenna
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1. What is Antenna ?
Long distance Communication
Short distance Communication
Parabolic Reflectors
Array Antennas
Patch Antennas
Helical Antennas
• Categorization of Antennas:
High Gain Low gain, Small Size
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Tag Antenna
Antennas for Radio Frequency Identification (RFID)
Antennas for Tire Pressure Monitoring System (TPMS)
• Application of Small Antenna:
Normal-Mode Helical Antenna (NMHA)
1. What is Antenna ?
Reader Antenna
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2. What is NMHA ?
Categorization of Helical Antennas
Axial Mode
Normal Mode Radiation Pattern
• Main radiation is in the antenna axis direction
• Circumference (C) is one wavelength (λ)
• Applications: Satellite ant, Circular polarization ant.
• Main radiation is in the normal direction of the antenna axis
• Height of antenna is less than 1/100 wavelength (λ)
• Applications: RFID tag, TPMS
H
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~HA
DA
~
RD - jXDRL + jXL
N
2. What is NMHA ?
• Operational Explaination of NMHA
N
Small Dipole
Small LoopsH << λ
• Electrical Working Condition:Resonant Structure: XC = XL
XC: CapacitanceXL: Inductance
Treatment: Antenna current is divided into 2 parts: the straight part (small dipole) and circular parts (small loops)
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3. Structural Determination Method
0.005 0.010 0.015 0.020 0.025 0.0300.005
0.010
0.015
0.020
0.025
0.030
0 2 4 6 8 10
DA/
HA/
N = 5
N = 7
N = 11
f0 = 315 MHzλ = 0.95 md = 0.55 mm
Self-Resonant Structure
• Equation for self-resonant structures (in Free Space ε0 =1)
AA
A
AA
A
HD
DN
DHN
H
209
)(7.19600
)92.0(
279 2
2
XC=XL
• Equation for Input impedance)( CLlrLrDin XXjRRRZ
In self resonant-structure, XL = XC so Zin = Rin = RrD + RrL + Rl
Here, RrD, RrL are the radiation resistance of the small dipole, small loops and Rl is the ohmic resistance of the antenna wire, respectively.
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4. Study Subject
Actual NMHA
• Study about resonance structures in dielectric or magnetic (by Electromagnetic simulations)
• Electric field and Magnetic field distributions in dielectric or magnetic
• From resonance curves, we derive resonance equation.
• Determination of Structural Equation for Normal Mode Helical Antenna having Dielectric or Magnetic Material inside (ε1, µ1)
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5. Research Schedule
Study of NMHA
Fablication and
measurement of NMHA
Learning of FEKO (EM
Simulation)
Calculate resonant
structures at ε=εi µ=µi
(not Free Space)
Summarizesimulated results
Find out structural equation
March, April, May 2015
June, July, Aug, Sept
2015
Oct, Nov, Dec2015
Jan, Feb2016
March, April, May 2016
• Research Steps:
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6. Present Situation
Caculation of Self-resonant Structure
Rin
Rl
Caculation of Input Resistance
Calculation of self-resonant structures and input resistance (in Free Space ε0)
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7. Conclusion
• Now, fundamentals of NMHA are studying
• Next subject is to learn an electromagnetic simulator
• Obtain resonant structural data of NMHA in dielectric and
magnetic materials.
Thank you for your attention