Design of Planar and Compact UWB Microstrip Antenna with Band Rejection Features

Abstract

In today’s world wireless is quickest flourishing zone in the communication region. Wireless Local Area Network (WLAN) and Worldwide Interoperability for Microwave Access (WiMAX) technologies are the maximum swiftly rising areas in the contemporary wireless communication. This truly possesses users the flexibility to travel around within a wide region but at the same time connected with the network. In the present environment, technology needs antennas that can function on various wireless bands and must possess versatile features as low cost, light weight, low profile antennas which are able to support high execution over a vast spectrum of frequencies. In the present atmosphere, technology requires ultra-wideband antennas that can function at a broader range of frequency and at the same time with a minimum level of power. But as there are huge number of narrow wireless frequency bands exists in the same ultra-wide band, these creates interference. Hence, there is a necessity of competent and a superior execution antenna which functions at UWB but at the same time discards the interfering bands. With an aim of having transmission in frequency bands except WLAN, WiMAX etc., it is significant to discard these interfering bands at the UWB range used in a broader range globally. In this thesis report, various techniques for discarding the interfering bands in the UWB antenna are conferred. The aim is partially fulfilled by implanting various slots on patch and ground of UWB antenna. In the first design, two arc shaped slots are etched from the patch to reject WiMAX and ARN band; two symmetrical slits are etched from the CPW ground to reject WLAN; rectangular SRRs are etched from the feed line to reject ITU-8 and two symmetrical circular SRRs are etched from the lower part of the patch to reject amature radio band. Simulations are done on CST Studio 2014. In the second design, a single composite parasitic element is used to reject three bands e.g. fixed satellite mobile except aeronautical mobile, aeronautical radio navigation, earth exploration satellite, maritime satellite. The band notched UWB antennas are then fabricated and tested using FR-4 substrate of thickness 1.6 mm. The antenna is tested using Agilent VNA model no. E5071C. The measured and simulated results are compared. The measured and simulated results obtained are similar to each other with a slight variation.