Measured variation in performance of handheld antennas for a large number of test persons

Pedersen, Gert Frølund; Nielsen, Jesper Ødum; Olesen, Kim; Kovács, István Z.

doi:10.1109/vetec.1998.686625

Cited by 52 publications

(29 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In [13], impedance mismatch loss with different phone grips was evaluated and in [14] a rigorous investigation on mobile-phone grip styles over a sample population of 100 subjects was proposed. Moreover, [15] shows the impact of the human body which can be seen from the shadow effect in the far-field pattern of the antenna in the direction of the person and [16] investigates how much the body anatomy affects the Mean Effective Gain, resulting in a variation of more than 10 dB among people with different characteristics. Furthermore, recent studies [17] focus on the user effects on the performance of the mobile antenna at 28 GHz, since this is one of the candidate bands for the upcoming 5G communication systems.…”

Section: B Free-spacementioning

confidence: 99%

OTA Evaluation of Mobile Phone Antenna Performance for VoLTE [Measurements Corner]

Paola

Karstensen

Fan

2018

IEEE Antennas Propag. Mag.

View full text Add to dashboard Cite

Abstract-This paper compares Over-The-Air (OTA) performance of traditional voice service and Voice over LTE (VoLTE). The results of the OTA measurements of the antenna performance of 22 mobile phones commonly used over the last two years are presented. VoLTE is a feature included into LTE which allows voice service to be delivered as data flows. Traditional investigations for LTE only include data service and therefore OTA for data services which is measured with the phone held in browsing position by the hand only, whereas the VoLTE uses the same data channel but in a position next to the head held by a hand. Traditional investigations of voice service only include voice service and OTA in voice service. The Figures of Merit (FoMs) taken into account for the ranking of the devices are the Total Radiated Power (TRP) and the Total Isotropic Sensitivity (TIS), related respectively to the transmitter and receiver antennas performance. The investigation includes results for talk mode using left and right hand phantoms next to head to calculate the maximum power radiated by the transmitter. To evaluate the sensitivity of the receiver, performances in talk mode using right hand phantom next to head as well as in data mode using only the hand phantom were considered. The results show a variation in TRP from 9 dB to 17 dB and approximately 9 dB spread in TIS among the phone models in the European LTE bands analyzed. Up to 8 dB difference in TRP between right and left hand usage were found for the worst performing phones, whereas their performances in free space are the same as the best performing phones. Key parameters of our analysis are accuracy, repeatability and testing time, since the equipment and the measurement procedure follow the CTIA Specification.

show abstract

Section: B Free-spacementioning

confidence: 99%

OTA Evaluation of Mobile Phone Antenna Performance for VoLTE [Measurements Corner]

Paola

Karstensen

Fan

2018

IEEE Antennas Propag. Mag.

View full text Add to dashboard Cite

show abstract

“…With this method it is relatively easy to include live persons in the measurements and study the influence of the human operator on the handset performance [3], [4]. Adding conductive cables to a handset may be a problem, since this will change the radiation properties of the handset.…”

Section: Introductionmentioning

confidence: 99%

Mobile handset performance evaluation using radiation pattern measurements

Nielsen

Pedersen

2006

IEEE Trans. Antennas Propagat.

Self Cite

View full text Add to dashboard Cite

Abstract-The mean effective gain is an attractive performance measure of mobile handsets, since it incorporates both directional and polarization properties of the handset and environment. In this work the mean effective gain is computed from measured spherical radiation patterns of five different mobile handsets, both in free space and including a human head & shoulder phantom. Different models of the environment allow a comparison of the mean effective gain obtained for realistic models based on measurements with the total radiated power and the total isotropic sensitivity. All the comparisons are based on the mean effective gain values obtained for different orientations of the handsets in the environments. For practical measurements it is important to minimize the measurement time. The paper includes a study of the variation in mean effective gain when the number of samples in the spherical radiation pattern is reduced. Furthermore, the frequency dependence of the mean effective gain is investigated, and a method is proposed for reducing the required number of measurements on different frequencies.Index Terms-Frequency dependence, mean effective gain (MEG), mobile handset performance, sampling density, spherical radiation pattern, total isotropic sensitivity (TIS), total radiated power (TRP).

show abstract

“…The expression in (3) shows that in general the capacity depends on both the eigenvalues and the SNR. However, it is well known that capacity is strongly dependent on the SNR with a weaker dependence on the eigenvalues [35].…”

Section: Free Space Capacitymentioning

confidence: 99%

User Influence on MIMO Channel Capacity for Handsets in Data Mode Operation

Nielsen

Yanakiev²,

Bonev

et al. 2012

IEEE Trans. Antennas Propagat.

View full text Add to dashboard Cite

Abstract-The current paper concerns realistic evaluation of the capacity of the MIMO channel between a BS and handheld device, such as a PDA or smartphone, held in front of the user's body (data mode). The work is based on measurements of the MIMO channel between two widely separated BSs in a microcellular setup, and six handsets located in an indoor environment. The measurements are done simultaneously in both the 773.5-778.5 MHz and 2250-2350 MHz bands, and from the two BSs. The handsets are realistic types and were measured both in free space and with twelve different users, using both one and two hands. The random capacities of the channels are evaluated in terms of outage capacity. For an SNR of 10 dB, median capacities in free space of about 4.4-4.7 bit/s/Hz for the low band and about 3.3-3.8 bit/s/Hz for the high band were found. The mean decrease in outage capacity due to the user was found to be up to about 2.2 bit/s/Hz, depending on the band and handset. More results are presented in the paper.

show abstract

Measured variation in performance of handheld antennas for a large number of test persons

Cited by 52 publications

References 6 publications

OTA Evaluation of Mobile Phone Antenna Performance for VoLTE [Measurements Corner]

OTA Evaluation of Mobile Phone Antenna Performance for VoLTE [Measurements Corner]

Mobile handset performance evaluation using radiation pattern measurements

User Influence on MIMO Channel Capacity for Handsets in Data Mode Operation

Contact Info

Product

Resources

About