Design Simulation and Prototype Development of High Power Wideband Log Periodic Directional Antenna

Log Periodic Directional Antennas (LPDAs) are generally used to attain high gains using only one antenna and are operated over a large range of frequencies. The log-periodic directional is an antenna that is linearly polarized, independent of frequency and have a moderately gain. By frequency indepe

Project Title

Design Simulation and Prototype Development of High Power Wideband Log Periodic Directional Antenna

Project Area of Specialization

Electrical/Electronic Engineering

Project Summary

Log Periodic Directional Antennas (LPDAs) are generally used to attain high gains using only one antenna and are operated over a large range of frequencies. The log-periodic directional is an antenna that is linearly polarized, independent of frequency and have a moderately gain. By frequency independent, we mean that the antenna’s observable characteristics, such as input impedance and pattern, vary insignificantly over a band of frequencies staying inside of the antenna’s design limits. Electronic Surveillance System (ESS) nowadays require a number of antennas that are both large as well as roisterous. LPDA is a passive, small and adaptive antenna that offers exceptional wide-band performance. This compact size log periodic dipole antenna system is ideal for transmission, reception, monitoring, surveillance and signal intelligence. Computer Simulation Technology (CST) software will be used for simulation.

Project Objectives

The objective is to design LPDA that will operate in a range of 0.8GHz to 3GHz. LPDA, that will be operating in L-Band and S-Band will also possess excellent directional characteristics and up to mark gain of greater than 8dBi. The feed power handling will be 300 CW with a nominal input impedence of 50 Ohms. 

Project Implementation Method

The key design aspects of the LPDA are sigma and tau. The antenna’s radiation pattern is unidirectional, with the primary lobe running parallel to the boom’s axis, off the end with the shortest elements. All elements in the antenna have a resonant wavelength that is roughly double their length. The antenna’s bandwidth, or it’s operating frequency at which it has the greatest gain, is roughly equal to the resonant frequencies of the shortest and longest elements. The optimum values for ? and ? can be determined using the insertion points obtained from Carrel’s graph. The Log Periodic Directional Antenna consists of linear dipoles arranged side by side in a plane. The parameters i.e. ?, ? , calculation of number dipoles N, band width B and length of dipoles will make up a prototype Log Periodic Directional Antenna. This will all be done on FR4 substrate, where FR stands for Flame Redundant and 4 indicates gass reinforced epoxy resin. The algorithm that will be used for optimization is TRF. The CST Studio Suite is a high-performance 3D electromagnetic (EM) analysis software suite for developing, evaluating, and optimising EM components such as antennas and other systems. The performance and efficiency of antennas and filters, electromagnetic compatibility and interference (EMC/EMI), human exposure to EM fields, electro-mechanical effects in motors and generators, and thermal effects in high-power devices are all common issues of EM study.

Benefits of the Project

UHF earthbound television can be received with the log periodic antenna. LPDA provides its user with a unique advantage of its adjustable Gain according to the situation. Thus making it applicable in ground based stations. By changing ? and ? in perfect ratio we can enhance the Gain of LPDA which other antennas are not capable of. This antenna provides its customers with consistent qualities over a specified frequency range. For applications where high gain and wide frequency ranges are required LPD is best suited. For Electro-Magnetic Capability measurements (while testing for radiated emissions) LPDA is a type of antenna that may offer a flat response over a wide range of frequencies.

Technical Details of Final Deliverable

Operating range 0.8 to 3GHz 
Feeding Power Handling 300CW 
VSWR less than 2 : 1

Gain  greater than 8 dBi 

Nominal Input Impedence 50 Ohms

 
 

Final Deliverable of the Project

Hardware System

Core Industry

Telecommunication

Other Industries

Core Technology

Others

Other Technologies

Sustainable Development Goals

Good Health and Well-Being for People

Required Resources

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