Antenna Radiation Pattern Measurement in a Nonanechoic Chamber

Froes, Saulo M.; Corral, Pablo; Novo, Marcela Silva; Aljaro, Miguel; Lima, Carla Caroline Valença de

doi:10.1109/lawp.2019.2891972

Cited by 15 publications

(9 citation statements)

References 13 publications

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“…Two recent alternate approaches for antenna calibration in non-ideal test conditions propose the incorporation of design and analysis of experiments (DAE) principles [15]. These approaches are described in [11,16]…”

Section: Dae-1 and Dae-2mentioning

confidence: 99%

Improving antenna gain estimations in non-ideal test sites with auto-tunable filters

et al. 2020

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Estimating the gain of an antenna prototype is an important step during both design and validation phases. Nevertheless, many small technology companies and universities are not provided with adequate infrastructure to run this type of test. In this paper, we propose a computational tool to deal with undesirable contributions coming from non-ideal test conditions over electromagnetic measurements. It is based on auto-tunable filters and therefore it allows a lab technician to run the test without a major knowledge on signal processing. After a series of evaluations based on lab measurements, the proposed tool gives results as good as those provided by two other approaches but with a reduction of the total number of experimental runs. Furthermore, it is more efficient than the traditional time gating approach for low signal-to-noise ratio environments. Finally, a validation with different antennas and test sites confirmes its robustness.

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Section: Dae-1 and Dae-2mentioning

confidence: 99%

Improving antenna gain estimations in non-ideal test sites with auto-tunable filters

et al. 2020

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“…An alternative approach involves the representation of transmission responses using Chebyshev polynomials [16]. The second class of post-processing techniques include an approach that involves reconstruction of the AUT response based on a set of measurements performed in different locations of the non-anechoic test site [21]. The structure characteristics are then extracted based on a set of weighted averages of the performed measurements.…”

Section: Introductionmentioning

confidence: 99%

A Low-Cost System for Far-Field Non-Anechoic Measurements of Antenna Performance Figures

et al. 2023

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Prototype measurements are the key step in the development of antenna structures. Typically, their far-field characteristics are validated in expensive, dedicated facilities such as open range sites, or anechoic chambers. Despite being necessary for obtaining high-precision data (e.g., for device qualification), the use of costly infrastructure might not be fully justified when the main goal of measurements includes demonstration of the methodology behind determination of the performance figures of interest (e.g., for the purpose of teaching), or rough validation of the EM simulation model correctness. From this perspective, systems for far-field measurements in non-anechoic environments represent an interesting alternative to the utilization of the state-of-the-art equipment and facilities. Despite their proven usefulness, the mentioned systems are normally constructed around the expensive, laboratory-grade equipment, which contradicts the whole concept of low-cost measurements. This paper discusses a costefficient, mobile system for experimental validation of antennas. Its main components include the in-house developed rotary heads, an open-hardware-based vector network analyzer, and the measurements postprocessing software. The cost of the system amounts to only around 3630 USD. The capabilities of the device have been demonstrated through measurements of two antenna structures. The considered performance figures include radiation pattern and single-direction gain vs. frequency. Comparisons against the measurements performed in benchmark conditions (anechoic chamber), as well as using professional network analyzer have also been provided. Furthermore, the documentation that facilitates the construction of the system components is shared in an online repository.INDEX TERMS Antenna measurements, compact radiators, gain, internet things, non-anechoic measurements, time-gating method, radiation patterns.

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“…The second class of methods is oriented towards extracting the effects of the propagation environment on the RA-AUT transmission. This is predominantly realized based on a series of independent measurements performed in the laboratory [12,20,24]. Practical approaches to the problem involve analysis of the AUT in multiple locations within the test-site [24], extraction of the noise floor in the environment [12], or estimation of the equivalent currents on a hull that encloses the radiator [28].…”

Section: Introductionmentioning

confidence: 99%

“…ACs, or semi-ACs with installed reflected surfaces) [15][16][17][18][19][20]32]. Furthermore, in the literature, the postprocessing parameters are fine-tuned to the given test conditions, which hinders transferring the setup between test sites [18,20,24]. From this perspective, the problem pertinent to correcting antenna measurements performed in non-anechoic environments remains open.…”

Section: Introductionmentioning

confidence: 99%

Multi-taper-based automatic correction of non-anechoic antenna measurements

Dzwonkowski,

Waladi,

Bekasiewicz

2023

Metrologia

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Prototype measurements belong to the key steps in the development of antenna structures. Although accurate validation of their far-field performance can be realized in dedicated facilities, such as anechoic chambers, the high cost of their construction and maintenance might not be justified if the main goal of measurements is to support teaching or low-budget research. Instead, they can be performed in non-anechoic conditions and then refined using appropriate correction algorithms. Unfortunately, the existing post-processing methods suffer from multiple challenges that include manual setup of parameters as well as validation of performance in idealized conditions. In this communication, a multi-taper-based framework for correction of antenna characteristics obtained in non-anechoic environments has been proposed. The algorithm augments one-shot measurements of the structure under test in order to extract the line-of-sight responses while attenuating the interferences pertinent to multi-path propagation and noise from external sources of radiation. The performance of the proposed correction routine has been demonstrated in two test sites using a geometrically small Vivaldi radiator and validated against state-of-the-art techniques from the literature. The uncertainty budget for the measurements performed using the approach amounts to 0.26 dB, which is low given challenging propagation conditions considered for experiments.

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Antenna Radiation Pattern Measurement in a Nonanechoic Chamber

Cited by 15 publications

References 13 publications

Improving antenna gain estimations in non-ideal test sites with auto-tunable filters

Improving antenna gain estimations in non-ideal test sites with auto-tunable filters

A Low-Cost System for Far-Field Non-Anechoic Measurements of Antenna Performance Figures

Multi-taper-based automatic correction of non-anechoic antenna measurements

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