Small antenna measurements in spherical nearfield systems

Foged, L. J.; Duchesne, Luc; Durand, L.; Herbiniere, F.; Gross, N.

doi:10.1049/ic.2007.1120

Cited by 9 publications

(4 citation statements)

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“…The measurements were conducted in a Satimo Starlab [9] located in a shielded anechoic chamber. The test equipment consists of a ring with 15 bi-directional and dual polarized test probes, a base-station emulator, CMW500, to establish a phone call and a computer receiving the measured data from the phone under test.…”

Section: B Total Isotropic Sensitivity (Tis)mentioning

confidence: 99%

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

Paola

Karstensen

Fan

2018

IEEE Antennas Propag. Mag.

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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.

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Section: B Total Isotropic Sensitivity (Tis)mentioning

confidence: 99%

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

Paola

Karstensen

Fan

2018

IEEE Antennas Propag. Mag.

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“…Port 2 is terminated by a 50 Ohm load when measuring Port 1 and visa versa for the Port 2 measurement. A Satimo Starlab system [15] was used to measure the total antenna radiation efficiency and the 2-D antenna gain.…”

Section: A Measurementsmentioning

confidence: 99%

Multiple Frequency Band and High Isolation Mobile Device Antennas Using a Capacitive Slot

Rowell

Lam

2012

IEEE Trans. Antennas Propagat.

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The performance characteristics of the capacitive slot, or a slot placed between the feed and ground connections, in a planar inverted-F antenna (PIFA) are comprehensively analyzed. The PIFA capacitive slot behavior is measured inside a two antenna system within a mobile phone where the first antenna is a multiple band PIFA and the second antenna is a higher frequency band PIFA directly overlapping with the first antenna higher frequency band. The dual band PIFA in this paper is designed to be resonant in the quad-band , and the second PIFA is resonant in the 3G/4G frequency bands. The capacitive slot has three types of behaviors: affect the matching of existing frequency resonances, induce another frequency resonance, and improve the isolation between the two antennas. Together with optimal antenna ground and feed placement, the capacitive slot can act as a notched bandstop filter to decrease the mutual coupling between the two antennas by over 20 dB and decrease the envelope correlation by almost one order of magnitude.

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“…The free space, data and talk modes have been considered for the simulations in CST Microwave Studio. Furthermore, the measurements have been conducted in the Satimo Starlab [21] located in a shielded anechoic chamber at Aalborg University. The setup including the right hand phantom for the data mode and the right hand next to head phantom for the talk mode are in accordance with the CTIA test plan [22].…”

Section: Introductionmentioning

confidence: 99%

Investigation of User Effects on Mobile Phased Antenna Array from 5 to 6 GHz

Paola¹,

Syrytsin²,

Zhang³

et al. 2018

12th European Conference on Antennas and Propagation (EuCAP 2018)

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The goal of this paper is to evaluate the impact of the user to the performance of a phased antenna array in the frequency range from 5 to 6 GHz. The design consists of four quarter wavelength dipoles printed on the short edge of an FR4 substrate. Simulations including a 105°phase shifter proved that the antenna array can cover a 120°beamwidth, with a gain of 7 dBi. The analysis of the user effects in terms of total scan pattern (TSP) and coverage efficiency is carried out via simulations both in data mode and in talk mode. The comparison with the performance in free space shows a loss in gain from 2 dB up to 7 dB, due to the user hand and the user hand-head respectively. Simulation results have been confirmed by the measurements of the prototype with a hand and head phantoms.

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Small antenna measurements in spherical nearfield systems

Cited by 9 publications

References 0 publications

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

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

Multiple Frequency Band and High Isolation Mobile Device Antennas Using a Capacitive Slot

Investigation of User Effects on Mobile Phased Antenna Array from 5 to 6 GHz

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