%0 Journal Article
%T Compact Multiband Printed IFA on Electromagnetic Band-Gap Structures Ground Plane for Wireless Applications
%A Dalia Elsheakh
%A Esmat Abdallah
%J International Journal of Microwave Science and Technology
%D 2013
%I Hindawi Publishing Corporation
%R 10.1155/2013/248501
%X The fourth mobile generation requires of multistandard operating handsets of small physical size as well as has an increasing demand for higher data rates. Compact multiband printed inverted-F antennas (IFAs) for available wireless communications are proposed in this paper. A new design of a printed IFA based on a uniplanar compact EBG concept is proposed. An L-loaded printed IFA shaped over an artificial ground plane is designed as the main antenna to cover the GSM, LTE, UMTS, bluetooth, and WLAN. The multi-band is created by means of an electromagnetic band-gap (EBG) structure that is used as a ground plane. Different shapes of uniplanar EBG as ring, split ring resonator, and a spiral rather than mushroom-like structure are investigated. The proposed antenna is built on the uniplanar EBG ground plane with a size of £żmm2, which is suitable for most of the mobile devices. 1. Introduction The current upsurge in wireless communication systems has forced antenna engineering to face new challenges, which include the need for wide bandwidth, small-size, high-performance, robustness, ease of mounting on a host surface and low-cost antennas. To have compatible uses for a wide range of applications by fulfilling mobility requirement and holding up the performance as well as the capability of obtaining dual and triple frequency operations are challenges [1]. Printed IFAs offer an attractive solution to a compact and ease-low-cost design of modern wireless communication systems due to having the above advantages. Printed inverted-F antenna is a simple and compact radiator; however, it cannot radiate efficiently near a perfect electric conductor (PEC) ground plane due to the reverse image currents. Also, printed IFAs suffer from a number of disadvantages as compared to conventional nonprinted antennas. Some of their major drawbacks are the narrow bandwidth, length, low gain, and surface wave excitation that reduce radiation efficiency. To solve the problem of their narrow bandwidth, several techniques can be used [2¨C4]. A thicker substrate with a low dielectric constant or a ferrite composition provides a wider bandwidth but this approach leads to no low-profile designs and an increase in size. Noncontacting feeding methods such as proximity/aperture coupled can be used to improve the impedance bandwidth, but this is difficult to fabricate. Another possibility is multiresonator stack configuration with the inconvenience of resulting a large thickness prototype [5, 6]. To overcome the problem of large size, the basic antenna miniaturization techniques can be
%U http://www.hindawi.com/journals/ijmst/2013/248501/