Mobile Terminal Antenna Performance With the User's Hand: Effect of Antenna Dimensioning and Location

Ilvonen, Janne; Kivekäs, Outi; Holopainen, Jari; Valkonen, Risto; Rasilainen, Kimmo; Vainikainen, P.

doi:10.1109/lawp.2011.2163290

Cited by 63 publications

(38 citation statements)

References 10 publications

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“…In conventional Single-Input Single-Output (SISO) antenna systems, the main parameters affecting the antenna performance at the low-band are the size of the antenna element and chassis [6,16]. In addition, the location of the antenna element has a significant contribution to the antenna performance.…”

Section: Design Considerationsmentioning

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: Design Considerationsmentioning

confidence: 99%

Multiband Frequency Reconfigurable 4g Handset Antenna With Mimo Capability

Ilvonen¹,

Valkonen²,

Holopainen³

et al. 2014

PIER

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“…The middle of a ground is far from the best feeding alignment in terms of bandwidth (BW). In order to achieve the widest bandwidth, the most suitable feeding position is in the corner of a rectangular ground plane [18,19]. In free space conditions, allowing the antenna to extend beyond the ground plane (increasing the antenna ground clearance) further improves the radiation efficiency [20].…”

Section: Antennas and Simulation Setupmentioning

confidence: 99%

Impact of Feeding Location on on-Body Performance of Small on-Ground Antennas

Tuovinen¹,

Berg²,

Whittow³

2015

PIER C

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Abstract-In this paper, three commonly used on-ground antenna types (loop, monopole and planar inverted-F antenna) are compared in the scope of wireless body area networks (WBAN) for on-body communications at 2.45 GHz. The bandwidth of the antennas can be enhanced by placing them towards the edge or the corner of the small ground plane (25× 35 mm 2 ) which has, as a consequence, detrimental effects on radiation characteristics that motivates the examination of the impact of feeding location for on-body propagation in detail. The present study quantifies the trade-off between on-body efficiency, the gain in the direction tangential to the surface, applicability to launch creeping waves and bandwidth potential of the different antenna types with various feeding locations. The simulated channel gain |S 21 | around tissue-equivalent numerical phantoms is compared to an analytical WBAN path loss model.

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“…The effect of the user has long been acknowledged as a major influence on mobile antenna performance [1]- [4]. It both absorbs power as well as detunes the center frequency of the antenna.…”

Section: W Ith the Introduction Of Long Term Evolution (Lte)mentioning

confidence: 99%

User effect on the MIMO performance of a dual antenna LTE handset

Buskgaard

Tatomirescu

Barrio

et al. 2014

The 8th European Conference on Antennas and Propagation (EuCAP 2014)

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Abstract-This study focuses on the user influence on a MIMO antenna system in a smart phone form factor. The antenna system is designed to have a low coupling and correlation between its two antennas. The study is based on time-domain simulations of the antenna system in free space and with a head and hand phantom using a commercially available Finite Element Method solver. The MIMO parameters are evaluated with three different channel models.A static grip only gives one case of the user effect so the hand phantom is modified with a moving finger that is swept across the backplane of the phone. Based on the results of the study it is concluded that the placement of the index finger has a significant effect on the simulated antenna system. For certain finger placements the mismatch loss and absorption loss both change more than 5 dB.Overall the antenna system shows good MIMO performance in free space but suffers under the influence of the user. Especially the diversity antenna is heavily detuned and gives a total efficiency of -19.1 dB worst case compared to -1.9 dB in free space. The branch power ratio is increased by the user while the envelope correlation is decreased by the user.

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Mobile Terminal Antenna Performance With the User's Hand: Effect of Antenna Dimensioning and Location

Cited by 63 publications

References 10 publications

Multiband Frequency Reconfigurable 4g Handset Antenna With Mimo Capability

Multiband Frequency Reconfigurable 4g Handset Antenna With Mimo Capability

Impact of Feeding Location on on-Body Performance of Small on-Ground Antennas

User effect on the MIMO performance of a dual antenna LTE handset

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