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Active and Passive Electronic Components
Volume 2008, Article ID 742050, 6 pages
http://dx.doi.org/10.1155/2008/742050
Research Article

High Efficiency and Broadband Microstrip Leaky-Wave Antenna

Department of Innovation Engineering, University of Lecce, Via per Monteroni, 73100 Lecce, Italy

Received 1 December 2007; Accepted 8 May 2008

Academic Editor: T. Kalkur

Copyright © 2008 Onofrio Losito. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A novel layout of leaky-wave antennas based on tapered design has been proposed and investigated. The new tapered leaky-wave antenna (LWA) was designed running a simple procedure which uses an FDTD code, and using a suitable metal walls down the centerline along the length of the antenna connecting the conductor strip and the ground plane, which allows to use only half of the structure, the adoption of a simple feeding, and the reduction of sidelobes. The good performance of this new tapered microstrip LWA, with reference to conventional uniform microstrip LWAs, is mainly the wider band of 33% for VSWR , higher gain (12 dBi), and higher efficiency (up to 85%). Furthermore, from the theoretical analysis we can see that, decreasing the relative dielectric constant of the substrate, the bandwidth of the leaky-wave antenna becomes much wider, improving its performance.