Multiband Inverted-F Antenna With Independent Bands for Small and Slim Cellular Mobile Handsets

Abstract

Abstract-The design of a small ultra-thin Printed Inverted-F Antenna (PIFA) with independent control on the resonant frequency bands is proposed. The antenna consists of a slotted radiator supported by shorting walls and a small ground plane. The structure is designed and optimized to operate at 2.09, 3.74 and 5 GHz with achievable bandwidths of 11%, 8.84% and 10%, respectively. These three bands cover the existing wireless communication frequency bands from 1.5 -6.8 GHz. Each of the three bands can be controlled independently without affecting the other two bands. The 2.09 GHz band can be controlled to operate between 1.5 -2.09 GHz (33.33%), the 3.74 GHz band can be controlled over the range of 3.57 -4.18GHz (15.76%) and the 5 GHz band can be controlled to cover the band from 5.00 -6.80 GHz (30.50%). Results of intensive investigations using computer simulations and measurements show that the ground plane and the feed locations of the antenna have marginal effects on the performance of the antenna. The effects of the user's hand and mobile phone housing on the return loss, radiation patterns, gains and efficiency are characterized. The measured peak gains of the prototype antenna at 2.09, 3.74 and 5GHz are 2.05, 2.32 and 3.47 dBi, respectively. The measured radiation efficiencies for the corresponding three bands are 70.12, 60.29 and 66.24 % respectively.

Compact Printed Multiband Antenna With Independent Setting Suitable for Fixed and Reconfigurable Wireless Communication Systems

“…In the design of multiband antennas, it is desirable to have the ability to set the frequency bands independently from each other, but achieving this is very challenging [13]. Very often, when some parameters are adjusted to set a band to a particular frequency, the frequencies of all other bands are affected [32]- [35], and so the antenna has to be re-designed.…”

Inkjet-Printed Wideband Antenna on Resin-Coated Paper Substrate for Curved Wireless Devices

“…Paper is light weight, environmentally friendly (biodegradable) and comes from a renewable source, making it a very attractive option for such designs. Practical antennas for mobile and wireless applications have typically been designed using flat and rigid substrates such as FR4 [4]- [6]. With such rigid substrates, the antennas cannot be conformal.…”

Planar inverted-F antenna with J-shaped slot and parasitic element for ultra-wide band application

“…In this paper, we propose a planar inverted-F antenna (PIFA) that is a successful candidate for most mobile phone application [11][12][13] and laptop computers [14]. So far, the PIFA has generally been considered as a narrow band antenna, but a lot of effort has been made to broaden its bandwidth including the use of parasitic element [15][16][17], adding a slot [18] or using a capacitive feed [19].…”