Antenna-Pattern Diversity Versus Space Diversity for Use at Handhelds

Mattheijssen, P.; Herben, M.H.A.J.; Dolmans, Guido; Leyten, L.

doi:10.1109/tvt.2004.830156

Cited by 96 publications

(36 citation statements)

References 12 publications

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“…However, we highlight that the generally used approximation, as often used in the literature [19,24] for computing the diversity gain from signals correlation is rough an estimate and becomes inaccurate when the outage probability (α) becomes larger than 0.01 [13]. Furthermore, the equal mean branch power and uniform distributed AoAs in the azimuth plane is considered to drive the diversity gain equations [13,19,24]. The feature of the field simulator model is that the diversity gain for combining techniques can be accurately computed from the cumulative distributed function (CDF) of the simulated signals.…”

Section: Diversity Simulationmentioning

confidence: 99%

“…The validity of the numerical technique is rigorously studied by the statistical analysis of the simulated signals. The numerical approach offers accurate value of diversity gain in Rayleigh fading channels as is expressed analytically at [13]. On the other hand, the numerical method could be extended to simulate the communication performances that cannot be obtained analytically, such as bit-error-rate (BER), frame-error-rate (FER) and etc.…”

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confidence: 99%

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Analysis of Dual-Band Helical Antenna for Diversity on Mobile Phones

Khaleghi

Azoulay

Bolomey

2008

Wireless Pers Commun

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Antenna diversity on a mobile phone is considered using two dual-band, GSM900/1800, helical antennas. The received signals in mobile Rayleigh fading channel are modeled using a new field simulation technique that involves the three-dimensional (3D) radiation pattern of antennas, 3D angle of arrivals (AoAs) and Doppler frequency. Statistical tools prove the validity of the field simulator. The signals correlation coefficient and diversity gain are computed for different mobile propagation environments by considering AoAs. It is shown that the diversity gain is slightly influenced by the environment models. The experimental prototype is developed and measured. Antenna characteristics: return loss, coupling, 3-D radiation patterns and antenna efficiency are obtained by the measurements and simulations. The diversity performance of the array configuration is measured in the rich wave scattering environment of a reverberation chamber (RC). Results including: signals correlation coefficient, average power of diversity branches, apparent/effective diversity gain and antenna efficiency in RC are provided. The influence of the mobile user is measured as well. Diversity gain of the helical array in both operating frequencies is fairly good. The signals correlation with user's head increases in GSM900 and slightly decreases in GSM1800. In the former band, the diversity gain loss due to imbalance branch powers is found more important than in the later.

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Section: Diversity Simulationmentioning

confidence: 99%

mentioning

confidence: 99%

Analysis of Dual-Band Helical Antenna for Diversity on Mobile Phones

Khaleghi

Azoulay

Bolomey

2008

Wireless Pers Commun

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“…It is important to point out that in compact antenna diversity arrangement, if a significant mutual coupling exists the phasepattern information is essential for diversity performance evaluation. The idea is effective and simplifies the design of antenna patterndiversity systems, where low correlation coefficient is subjected to small overlapped radiation patterns and the phase-pattern diversity effect is being neglected [21][22][23]. To illustrate this term, the embedded element pattern of the dipole diversity configuration for two different separations (d = 0.1λ and d = 0.2λ) are shown in Fig.…”

Section: Correlation Coefficient and Pattern Analysismentioning

confidence: 99%

“…It is important to note that, the measured diversity gain of the present phase-pattern diversity system is the same as the space diversity system [22], if an equivalent correlation coefficient is considered.…”

Section: Diversity Gainmentioning

confidence: 99%

Diversity Techniques With Parallel Dipole Antennas: Radiation Pattern Analysis

Khaleghi¹

2006

PIER

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Abstract-Two parallel dipoles are assessed for antenna diversity. The three-dimensional radiation pattern is considered for signals correlation coefficient. The pattern analysis reveals that, depending on dipole spacing, three types of diversity techniques are generated: space, amplitude-pattern and phase-pattern diversity. The weighting of each technique in signals correlation coefficient mitigation is investigated. The results show that for closely spaced dipoles, the generated phasepattern diversity is the most dominant factor which greatly reduces the signals correlation coefficient.The diversity configuration is measured in a rich scattering environment. Results include signals correlation coefficient, diversity gain for selection combining and maximum ratio combining, effective diversity gain and antenna radiation efficiency can be demonstrated. We show that in rich multipath channel the minimum spatial distance, for effective diversity gain performance, is reduced from 0.5λ for uncoupled dipoles to 0.15λ for coupled dipoles.

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“…MIMO antennas or diversity antennas possibly form uncoupled parallel channels which increase the capacity of wireless links. The combination of the wideband and diversity technology enable the high data rate and good resolution in applications [10][11][12]. Then, a prototype of the diversity antenna is fabricated and measured to validate the design.…”

Section: Introductionmentioning

confidence: 99%

Wideband Quasi-Yagi Antenna Design and Its Usage in Mimo/Diversity Applications

Li¹,

Zhao²,

Cai³

et al. 2017

PIER C

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Abstract-In this paper, a novel wideband quasi-Yagi antenna is proposed and investigated for multiple-input multiple-output (MIMO)/diversity antennas applications. An aperture-coupled balun is adopted with a curved Yagi radiator for the antenna to realize wideband property. The proposed quasi-Yagi antenna has high radiation efficiency and stable end-fire radiation patterns, operating in a wide bandwidth from 7 to 13.8 GHz. Then a pattern diversity antenna is developed using two elements, which are overlapped partly and placed in opposite orientations. The measured 10-dB bandwidth of the MIMO antenna is from 6.3 to 13.6 GHz. Meanwhile, isolation between the two ports is better than −26 dB. The radiation patterns and envelope correlation coefficients are also presented. The proposed pattern diversity antenna is validated to perform stable behaviours over a wide bandwidth, and it will find applications in wireless communications and radars systems.

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Antenna-Pattern Diversity Versus Space Diversity for Use at Handhelds

Cited by 96 publications

References 12 publications

Analysis of Dual-Band Helical Antenna for Diversity on Mobile Phones

Analysis of Dual-Band Helical Antenna for Diversity on Mobile Phones

Diversity Techniques With Parallel Dipole Antennas: Radiation Pattern Analysis

Wideband Quasi-Yagi Antenna Design and Its Usage in Mimo/Diversity Applications

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