Abstract
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 35×45 mm2, which is suitable for most of the mobile devices.
Highlights
The current upsurge in wireless communication systems has forced antenna engineering to face new challenges, which include the need for wide bandwidth, small-size, highperformance, robustness, ease of mounting on a host surface and low-cost antennas
Different shapes of uniplanar electromagnetic band-gap (EBG) ground plane, split ring resonator shape, ring shape, spiral shape, and mushroom shape are applied as a ground plane; all cells have the same dimensions and periodicity
Spiral, ring, and split ring resonator give a good performance, respectively, with a good antenna matching. These results could be explained as a spiral shape creates band gap at a lower frequency from 1.5 to 2.5 GHz and band gap opened from 4 GHz to 8 GHz, while ring EBG shape ground plane creates a broad band gap from 2.5 to 4 GHz and another band
Summary
The current upsurge in wireless communication systems has forced antenna engineering to face new challenges, which include the need for wide bandwidth, small-size, highperformance, robustness, ease of mounting on a host surface and low-cost antennas. Printed IFAs suffer from a number of disadvantages as compared to conventional nonprinted antennas Some of their major drawbacks are the narrow bandwidth, λ/4 length, low gain, and surface wave excitation that reduce radiation efficiency. 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. Different shapes of mushroom-like high impedance surface (HIS) EBG structures are used to improve the antenna parameters such as broaden bandwidth and efficiency and reduce the electrical size. All simulations are carried out using the EM commercial simulator, HFSS version 13.0
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