Design of Microstrip Log Periodic Antenna for Wireless Applications

Abstract

The Microstrip Antenna (MSA) that we have designed can work on an ultra-wide band. A MSA has many attractive features like low profile, light weight, small volume and low production cost. In addition, integrating the Microstrip line feed structure with the radiating elements on the same substrate attains the benefit of a compact, low lost feed network. So to enhance the narrow bandwidth, log periodic concept is being used. Log periodic antenna is important with their ability to show nearly frequency independent characteristics over wide band of frequencies although they have relatively simple geometries. The MLPA contains 8 pairs of parallel elements on both sides of the microstrip feed line runs along the centre of the antenna. The range of MLPA is from 2.824 GHz to 5.253 GHZ (with a Band width of 29.921%). Test results shows that the antenna can operate at S/C bands with voltage standing wave ratio (VSWR) less than 2 and high directional radiation patterns. This antenna can be used for satellite communication, amateur radio broadcasting, providing Wi-fi channels etc.