Design method for a broadband inverted F antenna by parallel resonance mode

Abstract

SUMMARYThis paper presents a broadband inverted F antenna realized by adding a wire element and describes a method for its design based on the operating principle. This inverted F antenna has a configuration with a wire element attached at the middle of the wire element already connected at the feed point. Broadband operation is made possible by a new method in which a parallel resonance antenna is combined with the wire inverted F antenna, which is a series resonance antenna. A design method is proposed in which matching at each resonant frequency is independently adjusted by means of these two different resonances. Its effectiveness is demonstrated by experiments and by a simulation by NEC2.

Folded planar inverted‐F antenna (PIFA) with two via holes for bandwidth enhancement

“…Many different methods of exciting a CP DRA have been studied, such as using quadrate feed [1], special geometries of DRAs [2], parasitic patches [3], and so on. However, quadrate feed increases the size and complexity of the feed network; special geometries of DRAs are limited by the availability in commercial markets; parasitic patches increase the metallic loss and reduce the radiation efficiency.…”

“…2. P. Gamand, A. Deswarte, M. Wolny, L.-C. Meunier, and P. achieve smaller size and wider bandwidths: adding a resonant stub [1], patterning the ground plane [2], meandering the radiating element to achieve multiple resonances [3], and capacitive feeding and loading [4] and folded a radiating element [5] are a few examples. However, in general, the bandwidth and size of an antenna are considered as mutually conflicting properties.…”

A simple multi-band wire inverted-F antenna for cellular application inside handset terminals

“…Possessing a simple but effective structure, the well-known inverted-F antenna (IFA) has attracted much attention from handset antenna designers over the past few decades [1,2,3,4,5,6,7]. There are a large number of studies proposing a variety of handset antenna models with high antenna performance based on the fundamental "inverted-F" structure of an IFA.…”

“…There are a large number of studies proposing a variety of handset antenna models with high antenna performance based on the fundamental "inverted-F" structure of an IFA. In these studies [1,2,3,4,5], multiband improvement techniques for IFA has been particularly focused on and investigated. However, these proposed multi-band techniques have not utilized exhaustively the possibility of using only one shorting strip to achieve good impedance matching at multiple frequencies.…”

Development of Wideband Planar Inverted-F Antennas for Wireless Application

“…Various methods have been proposed for bandwidth enhancement of antennas, including utilization of additive stubs (Ammann and Doyle, 2001;Olmos et al, 2002;Sekine et al, 2004), patterning the ground plane (Wang et al, 2004;Abedin and Ali, 2003),investigating the material proprieties (Ismail et al,2010), meandering the radiating element to achieve multiple resonance frequencies for bandwidth enhancement (Sim and Choi, 2006), slots to achieve wideband impedance matching (Park et al, 2006), using the back side of the substrate (Chen, 2000;Dou and Chia, 2000), changing the feed plate silhouette (Feick et al, 2007), meandering the shorting strip (Chan et al, 2008), adding a radiating element (Il-Young et al, 2010), or by using antenna array (Islam et al, 2007) The aim of this study is to enhance the bandwidth of the planar inverted-F antenna, for this reason and to get a wideband antenna. Firstly we performed a parametric study of PIFA antenna where we have varied the shorting plate width, the feed plate width, the distance between the shorting plate and the feed plate, we studied afterwards the effects of these three parameters of the PIFA on its resonant frequency's impedance bandwidth and radiation pattern.…”