Design and Implementation of Log-Periodic Antenna

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