Engineering, Technology & Applied Science Research Vol. 10, No. 1, 2020, 5270-5275 5270 www.etasr.com Ghnimi et al.: Study of a New Design of the Planar Inverted-F Antenna for Mobile Phone Handset … Study of a New Design of the Planar Inverted-F Antenna for Mobile Phone Handset Applications Said Ghnimi Faculty of Sciences of Tunis University of Tunis El Manar Tunis, Tunisia said.ghnimi@fst.rnu.tn Abdelkhalek Nasri Faculty of Sciences of Tunis University of Tunis El Manar Tunis, Tunisia abdelkhaleknasri@yahoo.fr Ali Gharsallah Faculty of Sciences of Tunis University of Tunis El Manar Tunis, Tunisia ali.gharsallah@fst.utm.tn Abstract—This paper suggests a new design of the PIFA antenna for mobile phone handset applications. In this context, we are interested in the development of new techniques based on the creation of slot matching for the improvement and miniaturization of a dual-band PIFA antenna operating at 900MHz and 1800MHz. Analysis of antenna parameters such as return loss (S11), radiation pattern, Voltage Standing Wave Ratio (VSWR), current distributions, gain, and the relation between them are performed in CST software. There is a good agreement between the results of simulation by CST and HFSS and those of measurement for the proposed antenna. Keywords-PIFA antenna; dual-band antenna; slots radiating element; CST microwave studio I. INTRODUCTION Wireless communication technologies have become an essential part of everyday life. Antennas are basic components of any telecommunication system and are connecting links between the transmitter or receiver and free space. The PIFA antenna is a good candidate for these applications because it meets certain technical requirements. Several researches have been focused on the diverse applications of the PIFA antenna [1-7]. This antenna can be printed on dielectric blocks, so the dielectric properties of the block can be used to miniaturize or to improve the performance at the lower band edge [8]. In [9, 10], diversity MIMO PIFA antennas, for multi-mode satellite navigation applications, have been modeled and realized. In [11-12], the authors proposed compact PIFAs operating at 2.45GHz for body communications and multi-input MIMO applications [13]. However, these techniques provide important information for the design of mobile antennas in the presence of the human body such as the reflection coefficient, the radiation pattern, the antenna impedance and the specific absorption rate. Currently, several research groups around the world have undertaken the assessment of technical requirements to verify the conformity of antenna design for mobile communication. The resonance characteristics of implanted PIFA antennas and their radiation signature inside and outside the body must be evaluated by numerical analysis and measurements. Among them, the PIFA [14] using a conductive plate, and carried out on a flexible dielectric substrate FlexPIFA to operate at 2.45GHz [15]. Other techniques have been proposed in [16]. In that case, the slot is not printed on the ground plane but integrated on PIFA geometry. This technique creates an additional mode which improves the bandwidth to the upper band covering of GSM900-1800 for original design at GSM900 and1800 for the design of the integrated slot. The multiband objectives of PIFA antennas can be found in [17]. In [18-19], authors present other solutions employing a monopole antenna, based on a low- profile multi-band handset designed only with slot antennas. The slots are not only useful for PIFA antenna design, but also for damping unwanted modes for EMC purposes. A major interest area is the study of the effects of radiation on the organs of the human body. Therefore, it is important to realize a new PIFA antenna for mobile phones with the highest quality performance, with reduced electromagnetic exposure. In this context, a new compact PIFA antenna operating at different operational frequencies (900MHz and 1800MHz) is proposed. A parametric study was conducted on the antenna in order to ensure the required electrical and radiation performance. After the design and parameter defining and optimization, the simulation phase by using suitable software is a compulsory optimization step in order to save time and cost. It is also possible to take into account the dielectric parameters of the chosen low-cost materials. The chosen CST and HFSS electromagnetic simulation tools study and simulate complex structures for mobile terminals. The motivation for choosing a PIFA structure is that thus a larger band operation is achieved in the presence of a ground plane. In addition, antennas on a ground plane will be less affected by the presence of the human body. The antenna structures without a ground plane exhibit serious changes in the resonance frequency, depending on the distance of the body. Thus, the PIFA antenna is an attractive choice for many integration devices due to its low cost, simplicity of design and low profile. II. ANTENNA DESIGN AND PARAMETRIC STUDY In this part, we are interested in the simulation of a two- band rectangular PIFA antenna. We have added slots to the antenna at the top and bottom of the substrate to achieve the functioning for these bands for mobile phones. The proposed antenna elements were manufactured on the substrate FR4_Epoxy of relative permittivity Ԑr=4.4, tanδ=0.0013, thickness h=1.6mm, and the ground plane was made of FR4 (Ԑr=4.4, tanδ=0.03). The shorting pins and the feeding pin were Corresponding author: Said Ghnimi