| 11. |
- Prasad, Sathyaveer, 1978-, et al.
(author)
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EVALUATION OF THE TELIA SCATTERED FIELD MEASUREMENT METHOD FOR ESTIMATION OF IN-NETWORK PERFORMANCE OF MOBILE TERMINAL ANTENNAS
- 2007
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In: 29th Annual Symposium of the Antenna Measurement Techniques Association (AMTA 2007). - St.Louis,USA : AMTA 2007.
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Conference paper (other academic/artistic)abstract
- In this paper we present and evaluate a method for estimation of in-network performance of mobile terminal antennas developed by the Swedish telecom operator Telia. The Telia Scattered Field Measurement (TSFM) Method is intended to give a better estimate of the performance of the mobile terminal antenna as in an in-network fading scenario. The parameter measured from the TSFM method is referred to as the Scattered Field Measurement Gain, SFMG, i.e. the Mean Effective Gain, MEG, measured relative to a half wave dipole antenna. MEG includes the radiation pattern of the mobile terminal antenna as well as an estimate of polarization and directional losses that occur due to the propagation environment. In this study it is found that the TSFM method provides a good measure of the in-network performance of the mobile terminal antenna. Furthermore, it is shown that the SFMG measured with this method is found to be well correlated with the Total Radiated Power Gain, TRPG, or radiation efficiency. This suggests that the Total Radiated Power, TRP, may be a good measure of the in-network performance of mobile terminal antennas if measured with proper adjustment to the antenna and propagation channel mismatch.
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| 12. |
- Ramachandran, Prasadh, 1982-, et al.
(author)
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Adaptive Matching Circuitry for Compensation of Finger Effect on Handset Antennas
- 2009
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In: EuCAP 2009. - Berlin. ; , s. 801-804
-
Conference paper (peer-reviewed)abstract
- In this paper we present and evaluate the effect of hand on terminal antenna and discuss a method to compensate for the mismatch. A dual band PIFA was used in this study. The presence of the hand was observed to cause 2-6dB loss in efficiency in low-band and 2-4dB loss in highband.In this study we propose a dynamic antenna matching (DAM) technique to improve matching level that can improve the total efficiency of the antenna by 2 – 4dB compared to the mismatched case.
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| 13. |
- Ramachandran, Prasadh, 1982-, et al.
(author)
-
Impedance determination of terminal power amplifiers for optimal antenna matching using load-pull method
- 2009
-
In: 2009 IEEE INTERNATIONAL WORKSHOP ON ANTENNA TECHNOLOGY. - Santa Monica, California : IEEE. - 9781424443963 - 9781424443956 ; , s. 1-4
-
Conference paper (peer-reviewed)abstract
- In this paper we present a single tuner based load-pull method for characterization of optimal antenna load impedance in mobile terminals. In the proposed load-pull set-up the mobile terminal itself is used as a source. The presented method can provide valuable data for antenna design since it determines the optimal impedance at the antenna connector/pad taken into account the full output circuitry of the mobile terminal. It reveals the modification of the power amplifier, PA, output impedance caused by the presence of saw filter, antenna switch, and transmission line possibly present between the PA and the antenna. With the presented method it is not only possible to characterize the optimum antenna impedance to present to the terminal in different bands and channels but also to reveal the impedance miss-match sensitivity for each channel.
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| 14. |
- Smith, Gregory, et al.
(author)
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Shared Networks : More than making wireless communication affordable
- 2005
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In: Vehicular Technology Conference, 2005. ; , s. 2984-2988
-
Conference paper (peer-reviewed)abstract
- In the wake of the substantial financial commitments incurred by European and other UMTS network operators in the form of license fees, licensees have turned to network sharing as a means of reducing the capital requirements needed to bring 3G services to market. The reception from European regulators has been mixed, due to concerns that this inhibits competition, slow build-out, or otherwise result in reduced consumer benefits. The authors believe that the generic product life-cycle model provides insights that indicate that network sharing, within an appropriately constructed regulatory framework, is not a threat to vigorous competition in the 3G industry, and in fact, is one of the keys to stimulating the development of advanced, ubiquitous, affordable services.
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| 15. |
- Zhao, Hai, et al.
(author)
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Design of a Coupling Element Based Penta-band Mobile Phone Antenna
- 2009
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In: Antennas & Propagation Conference, 2009. LAPC 2009. Loughborough. - 9781424427208 ; , s. 209-212
-
Conference paper (peer-reviewed)abstract
- Based on the work by Vilanen et al., a small, low profile and efficientcoupling element based antenna with penta-band operations for the use inmobile telephones has been studied. The antenna was designed using the HighFrequency Structure Simulator, HFSS, from Ansoft. Two prototypes withdifferent antenna profile heights have been built, verified and tested. Thebandwidth of the antenna is extended compared to the original design. Alumped element based network is used to optimize the matching. Theresulting antenna operates (|S11|≤-5 dB) from 824 to 1300MHz and from1710 to 2170MHz, covering in total five cellular bands with an efficiencybetter than -3dB and a total volume of less than 4cm3.
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