SAR Study of Different MIMO Antenna Designs for LTE Application in Smart Mobile Handsets

Zhao, Kun; Zhang, Shuai; Ying, Zhinong; Bolin, Thomas; He, Sailing

doi:10.1109/tap.2013.2250239

Cited by 66 publications

(43 citation statements)

References 10 publications

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“…Elem1 and Elem2 refers to antenna elements 1 and 2, respectively. are placed at the bottom part of the device in order to fulfill the SAR requirements when the handset is used in a talking position [22][23], as shown in Figure 8(a). The phantom hand is based on the CTIA OTA test plan, revision 3.0.…”

Section: User Effectmentioning

confidence: 99%

Multiband Frequency Reconfigurable 4g Handset Antenna With Mimo Capability

Ilvonen¹,

Valkonen²,

Holopainen³

et al. 2014

PIER

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Abstract-A novel frequency reconfigurable 4G Multiple-Input Multiple-Output (MIMO) handset antenna is presented and verified with experimental results. Frequency tuning is used to minimize the antenna volume and to compensate for the losses related to user-originated impedance detuning. Both antenna elements are independently frequency reconfigurable and can cover most of the LTE-A bands. The study compares the losses of CMOS-and MEMS-based digitally tunable capacitors (DTC). In addition, two prototypes with total antenna volumes of 1170 and 3900 mm 3 have been studied. The results show that the larger antenna structure operates with an efficiency better than 49% across the frequencies of 698-960 MHz and better than 56% across the frequencies of 1430-2690 MHz, when a MEMS-based DTC is used. In addition, a new method is introduced to estimate the suitability of the antenna geometry for frequency tunable antennas.

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Section: User Effectmentioning

confidence: 99%

Multiband Frequency Reconfigurable 4g Handset Antenna With Mimo Capability

Ilvonen¹,

Valkonen²,

Holopainen³

et al. 2014

PIER

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“…Different types of these antennas have been presented by Kin Lu Wong et al for wireless and cell phone applications [5,6]. PIFA antennas are attractive because of their economical benefits as well as for the following features: multiband operation, high efficiency, low profile, lightweight, approximate omnidirectional radiation characteristics, circular polarisation or diversity of polarisation, and low specific absorption rate (SAR) [7,8]. Many techniques have been reported to design multiband PIFA antennas including shorted patch, stacked shorted patch, shorted patch antenna with Lprobe feed, shorted U-slot patch, and folded shorted patch.…”

Section: Introductionmentioning

confidence: 99%

Low SAR PIFA Antenna for Wideband Applications

Naser‐Moghadasi

Mansouri

Sharma

et al. 2016

IETE Journal of Research

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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).

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“…Thus, antenna design plays an important role even for stand-alone SAR. So far, studies on SAR performance for multi-antennas are quite limited [8][9][10]. A technique to optimize SAR in multi-antenna systems was proposed in [9] using beamforming.…”

Section: Introductionmentioning

confidence: 99%

“…A technique to optimize SAR in multi-antenna systems was proposed in [9] using beamforming. In [10], SAR levels for ground free, on ground and co-located multiantennas were investigated. The metrics of SPLSR (SAR to peak location spacing ratio) was used in evaluating and comparing simultaneous SAR for different antenna setups.…”

Section: Introductionmentioning

confidence: 99%