Certain investigations on fractal Antennas for broadband public Protection and disaster relief ppdr Communications

Abstract

In modern era, managing a consistent and nationwide public safety wireless communication system is the major concern. Public Protection and Disaster Relief (PPDR) communications are the wireless technology to protect and rescue people from nature and man-made disaster. They are also referred as emergency communications or Public safety communications. An antenna is one of the indispensable components in the wireless communication. During the disaster, the transmission and reception of the data from the wireless devices in the disaster area to the central control system are performed by an antenna. The antenna should have the ability to operate in the broadband PPDR communications band from 4940 MHz - 4990 MHz that are assigned by the International Telecommunication Union Radiocommunication Sector (ITU-R). Besides, the compact size is the key factor for enabling easy integration to the wireless devices. newlineMany techniques such as bending, folding, meandering, helical and spiral shaping, fractal have been implemented for achieving the compact size in antennas. This thesis presents novel antennas based on the fractal geometries and meta-surface (MS) that can obtain low-profile antenna with better performance. In this brief presentation, four different antennas namely Sierpinski Knopp Fractal (SKF) antenna, Complementary Sierpinski Knopp Fractal (CSKF) antenna, Meta-fractal (MF) antenna and Koch Fractal (KF) antenna with incorporation of Complementary Split Ring Resonator (CSRR) in the ground plane are proposed for PPDR communications. All proposed antennas have been analyzed by using 3D electromagnetic simulator Ansys High Frequency Structure Simulator v 17.2 (HFSS). newline