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

Block diagram and Specifications

specifications
Properties Values
No of log-periodic
antennas
4
Frequency range 350 to 1500 MHz
Bandwidth 1150MHz
Gain 7 to 8 dBi
No of elements 20
Height 543mm
Width 500mm
RF switch 4:1

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.

Implementation
 CST microwave studio
 Finite element method
 Material used: aluminium
 Two square booms of
6*6mm
 20 elements of 3mm
diameter

Contd….
Radiation pattern at 1150Mhz
S parameter results

Radiation pattern at 550Mhz Radiation pattern at 925Mhz

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).

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.

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.

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.

 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.

Thank You

Design and Implementation of Log-Periodic Antenna

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