Analysis of a GSM base station antenna near conductive object: far field pattern distortion

Šarolić, Antonio; Modlic, Borivoj; Poljak, Dragan

doi:10.1109/icecom.2003.1290996

Cited by 2 publications

(4 citation statements)

References 2 publications

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“…Despite typically these kind of low visual impact products are claimed to be RF-transparent, from the simulation an average back radiation increase of 1.27 dB in azimuth and 3.47 dB in elevation was found. This result is in line with the findings in [6] which predicted a FBR reduction of 2.43 dB for a circular radome of 650 mm of diameter.…”

Section: Resultssupporting

confidence: 92%

“…Table IV provides a detailed summary of the distortion caused by each of the different elements on the front and back radiation lobes. These results combined with previous observations confirm that, in general, mounting structures and nearby obstacles have a small impact on the radiation pattern in agreement with [5], [6] and [7]. By considering the full rooftop scenario with radome plus rooftop and nearby chimney, the minimum azimuth FBR is reduced in 4.78 dB compared to the original reference of 20 dB.…”

Section: Resultssupporting

confidence: 87%

“…This work found insignificant variations in the azimuth plane and up to 4-5 dB ripples in the elevation back lobe. Other studies [5,6] estimated the effect of different antenna masts, reflectors and mounting structures by applying array-theory and method-of-moments (MoM) techniques. The first study found a 1.5-3 dB variation in the antenna boresight direction due to presence of the masts.…”

Section: Introductionmentioning

confidence: 99%

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Base Station Antenna Pattern Distortion in Practical Urban Deployment Scenarios

Rodríguez

Nguyen

Sørensen

et al. 2014

2014 IEEE 80th Vehicular Technology Conference (VTC2014-Fall)

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In real urban deployments, base station antennas are typically not placed in free space conditions. Therefore, the radiation pattern can be affected by mounting structures and nearby obstacles located in the proximity of the antenna (near-field), which are often not taken into consideration. Also the intrinsic propagation mechanisms of the urban environment (far-field) can contribute to the distortion of the radiation pattern observed in a practical deployment scenario, especially when comparing it to the antenna pattern provided by the manufacturer and typically measured in free space. This paper presents a combination of near-field and far-field simulations aimed to provide an overview of the distortion experienced by the base station antenna pattern in two different urban deployment scenarios: rooftop and telecommunications tower. The study illustrates how, in comparison with the near-field effects, the urban propagation becomes the main contributor to the total distortion experienced. For the considered scenarios, the simulation results show a front-to-back-ratio reduction of approximately 10-15 dB in the effective antenna pattern compared to the free space reference. The near-field distortion has been evaluated by means of finite integration technique (FIT) simulations, while the far-field effects have been analyzed through intelligent ray tracing (IRT).

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Section: Resultssupporting

confidence: 92%

Section: Resultssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

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Base Station Antenna Pattern Distortion in Practical Urban Deployment Scenarios

Rodríguez

Nguyen

Sørensen

et al. 2014

2014 IEEE 80th Vehicular Technology Conference (VTC2014-Fall)

View full text Add to dashboard Cite

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“…The conductive objects in the vicinity of the antenna distort the radiation pattern [1][2][3][4][5][6][7]. To our knowledge, this problem is not addressed in references on electromagnetic field calculation around base stations.…”

Section: Introductionmentioning

confidence: 99%

Installation Uncertainty of Field Level Calculation around a Base Station Antenna

Šarolić

Modlic

2007

JCOMSS

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In the near field, the antenna pattern provided by the antenna manufacturer is generally not applicable, or shouldbe considered with caution, even for the single antenna in free space. In the real life, antenna is often surrounded by other conductive objects in the immediate vicinity. These objects tend to distort the antenna radiation pattern. Since the electromagnetic field calculation for the coverage or radiation hazard analysis depends on the three-dimensional antenna gain, this effect should be taken into account. This paper suggests the use of "installation uncertainty" that should be added to the field calculation. The amount of this quantity depends on the installation geometry and can be calculated numerically for a specific situation. This paper shows the results of numerical calculations for some typical antenna installation geometries.

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Analysis of a GSM base station antenna near conductive object: far field pattern distortion

Cited by 2 publications

References 2 publications

Base Station Antenna Pattern Distortion in Practical Urban Deployment Scenarios

Base Station Antenna Pattern Distortion in Practical Urban Deployment Scenarios

Installation Uncertainty of Field Level Calculation around a Base Station Antenna

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