An inverted FL antenna for dual-frequency operation

Abstract

Abstract-An inverted FL antenna (InvFLA) is analyzed to obtain dual-frequency operation at 2.45 and 5.2 GHz (wireless LAN system frequencies). The InvFLA is composed of inverted FL elements, a parasitic element, and a ground plate, where these lie in the same plane, i.e., the structure is a card-type structure having a co-planar ground plate. The antenna height above the ground plate is very small: 5 5 mm = 0 045 wavelength at 2.45 GHz.The analysis shows that the InvFLA has a 4.1% bandwidth around 2.45 GHz and a 31.8% bandwidth around 5.2 GHz, both for a VSWR = 2 criterion. The gain is calculated to be 0.9 dBi at 2.45 GHz and 1.7 dBi at 5.2 GHz, with a small gain variation in each of the VSWR bands.

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.…”

Design of a planar inverted F-L antenna (PIFLA) for lower-band UWB applications

“…However, the conventional PIFA has bandwidth constraints; typically 4-12% impedance bandwidth is achievable in an unmodified design. Modified PIFA designs include T-slot geometries [3], the introduction of parasitic elements, such as the inverted L [4,5], modified ground planes [6,7] and modifications to the feeding and shorting plates [8,9]. The design adopted here is a miniaturized 'FL' antenna, or PIFLA [10].…”

A Wideband Low-Profile Antenna Composed of a Conducting Body of Revolution and a Shorted Parasitic Ring

“…Numerous multiband and wideband antennas have been developed [1]- [14] in response to the recent demand for wireless communication systems; for instance, the antenna in [10] is for dual-band operation around 2.4 and 5.2 GHz, while the antenna in [13] is for wideband operation ranging from 2.1-10.6 GHz (frequency band for UWB systems). These antennas are made of a thin-film and can be installed inside IT mobile devices, such as laptop computers and portable telephones.…”