Project Title : Design and implementation of Log-Periodic antenna
Name of the students :
PES’s Modern College of Engineering, Shivajinagar, pune-5.
Department of Electronics and Telecommunication
1. Shruti Nadkarni 2. Sneha Vyawahare 3. Gargi .R. Mohokar
Sponsored by : University of Pune
Project Guide: Mrs.D.P Adhyapak
Features
directivity is more robust
self-similar relation between the lengths, separations and widths of the elements
potential for improvement of both directivity and operational bandwidth over classical Yagi–Uda designs
PES’s Modern College of Engineering, Shivajinagar, pune-5.
Department of Electronics and Telecommunication
Block diagram and Specifications
PES’s Modern College of Engineering, Shivajinagar, pune-5.
Department of Electronics and Telecommunication
specifications
Properties ValuesNo of log-periodic antennas
4
Frequency range 350 to 1500 MHzBandwidth 1150MHzGain 7 to 8 dBiNo of elements 20Height 543mmWidth 500mmRF switch 4:1
PES’s Modern College of Engineering, Shivajinagar, pune-5.
Department of Electronics and Telecommunication
Methodology used
Finite element method Numerical technique for finding approximate solutions to
boundary value problems. In CST, any conducting surface is divided into small areas
called cells, collectively known as mesh. Then it calculates electric field density for each cell
independently. Further , it calculates the electric field density for the
complete mesh, and thus gives the final result.
PES’s Modern College of Engineering, Shivajinagar, pune-5.
Department of Electronics and Telecommunication
Implementation
CST microwave studio
Finite element method
Material used: aluminium
Two square booms of 6*6mm
20 elements of 3mm diameter
PES’s Modern College of Engineering, Shivajinagar, pune-5.
Department of Electronics and Telecommunication
Contd….
Radiation pattern at 1150Mhz S parameter results
PES’s Modern College of Engineering, Shivajinagar, pune-5.
Department of Electronics and Telecommunication
Radiation pattern at 550Mhz
Radiation pattern at 925Mhz
PES’s Modern College of Engineering, Shivajinagar, pune-5.
Department of Electronics and Telecommunication
Project outcomes and its contribution to communication society
For direction finding to identify sources of disruptive signals.
To monitor local radio frequency interference for critical applications.
To identify man-made interference to sensitive radio-astronomy instruments like the Giant Metre-wave Radio Telescope (GMRT).
PES’s Modern College of Engineering, Shivajinagar, pune-5.
Department of Electronics and Telecommunication
IEEE Communication Project Competition
For building early warning systems for coastal surveillance.
To detect local sources which are saturating or interfering with our signals of interest.
PES’s Modern College of Engineering, Shivajinagar, pune-5.
Department of Electronics and Telecommunication
Conclusion
highly directional antennas with high gain.
identify the source of disruptive signals.
The radio frequency interference is also needed to be known to prevent the original signal from getting disrupted.
All these requirements are accomplished using log periodic antenna which we have designed for a frequency range of 350MHz to 1500MHz using CST.
PES’s Modern College of Engineering, Shivajinagar, pune-5.
Department of Electronics and Telecommunication
IEEE Communication Project Competition
References
A. O. Benz .E C. Monstein. H. Meyer. P. K. Manoharan. R. Ramesh. A. Altyntsev. A Lara. J. Paez. K.-S. Cho, “A World-Wide Net of Solar Radio Spectrometers: e-CALLISTO”, 10 April 2008.
C Balanis, “Antenna Theory Analysis and design” Wiley, 2005
J. D. Kraus, “Antennas”, Mc Graw Hill. http://www.radio-electronics.com NOWATZKY, D.: Logarithmisch periodische Antennen.
Technische Mitteilungen des RFZ, Jahrg. 7/Heft 2, June 1963, pp. 77-80, and Jahrg. 7/Heft 3, Sept. 1963, pp. 127-133.
PES’s Modern College of Engineering, Shivajinagar, pune-5.
Department of Electronics and Telecommunication
IEEE Communication Project Competition
SEVERNS, R., BEEZLEY, B., HARE, E.: Log Periodic Arrays. In The ARRL Antenna Book [CD-ROM]. The American Radio Relay League, Inc. Newington, CT 06111-1494.
BANIC, B., HAJACH, P.: Design and Simulation of Properties of Log-Periodic Dipole Antenna. In Radioelektronika 2000, Bratislava, 12-16. Sept. 2000, pp. P_108-P_109.
C. A. Chen and D. K. Cheng, “Optimum Element Lengths for Yagi-Uda Arrays. ”
IEEE Trans. Antennas propag., Vol. AP-23, pp. 8-15, January 1975.
PES’s Modern College of Engineering, Shivajinagar, pune-5.
Department of Electronics and Telecommunication
Thank You
PES’s Modern College of Engineering, Shivajinagar, pune-5.
Department of Electronics and Telecommunication