Low SAR PIFA Antenna for Wideband Applications

Abstract

In this article, a novel low specific absorption rate (SAR) printed planar invert-F antenna (PIFA) antenna for wideband application is presented. The prototype antenna was designed to cover the frequency range between 1200 and 3000 MHz. Its radiation pattern is approximately omnidirectional, VSWR < 2, gain in the range 2À4.6 dBi, and efficiency greater than 78%. The prototype antenna exhibits a low SAR of around 1.04 for 1 g at 1800 MHz, which is less than 51% than a conventional PIFA antenna. The antenna's performance was evaluated using finite element method (FEM) and time domain method (TDM) in electromagnetic (EM) simulation tools like HFSS and CST Microwave Studio. These results are compared with measured data. The antenna's wide band covers various wireless standards like GPS/DCS/GSM1800/PCS/WLAN/Bluetooth/WiMAX/LTE. The parametric studies clarified the effect of the stub line and via's on voltage standing wave ratio (VSWR).

Simple Approach to Bandwidth Enhancement Of Compact Pifa For Wireless System Applications

“…Introduction of a slot on the radiator and ground in addition to the use of a shorting wall instead of pins at a well-chosen location broadened the bandwidth of PIFA of size 48.5 ×19 × 6.5 mm 3 to about 200MHz for center frequency 2.92GHz. [11].Improved bandwidth has been achieved by controlling current distribution through the implementation of two vias in a printed PIFA of dimension 100 × 60 × 1.6 that resonated between 1.2 -3.0GHz [12]. A single-wideband 3D PIFA with size 55 × 20 × 3 covering frequency band from around 1.6 GHz to 3.6 GHz in one single band was presented in scientific literature [13].…”

Design of wide band printed monopole antenna for low rate wireless personal area networks

“…In addition to the monopole antennas, loop antennas printed on the top of substrate are another popular type of PCB antennas for tablet and mobile phones . Also, uniplanar PIFA antennas have presented its potential applicability for mobile and tablet devices . The conventional PIFA offers issues related to design complexity, physical space, and strong interbranch coupling.…”

“…[8][9][10][11][12] Also, uniplanar PIFA antennas have presented its potential applicability for mobile and tablet devices. [13][14][15] The conventional PIFA offers issues related to design complexity, physical space, and strong interbranch coupling. Compact antennas are presented in literature for utilization in tablet, laptop, and hand held devices; [16][17][18] however, this type of antenna has limited gain which makes them less functional for target wireless applications.…”

Split ring resonator metamaterial loads for compact Hepta band printed inverted F antenna with circular polarization

“…14 The special shape of the antenna is one of the techniques for designing the PIFA with low SAR such as meandered monopole antenna 15 or sub-ring method. 16 Exactly current controlling by sloth and folded antenna are investigated as the best way of controlling and decreasing of the SAR effect on head [17][18][19][20] and it is important to dispense the current density in a wider area to reduce the E-field and therefore achieve lower SAR value. 16 A novel structure with an unusual characteristic that cannot find conventional in nature, such as negative permittivity and permeability have been suggested by Smith and colleagues.…”

“…16 Exactly current controlling by sloth and folded antenna are investigated as the best way of controlling and decreasing of the SAR effect on head [17][18][19][20] and it is important to dispense the current density in a wider area to reduce the E-field and therefore achieve lower SAR value. 16 A novel structure with an unusual characteristic that cannot find conventional in nature, such as negative permittivity and permeability have been suggested by Smith and colleagues. 21 Various shapes of microstrip metamaterials have been developed to achieve negative permittivity and permeability such as split ring resonator (SRR); moreover, we have gain enhancement and obtaining circular polarization (CP).…”