Edge diffractions impact on the cross polarization performance of active phased array antennas

Salazar, Jorge L.; Aboserwal, Nafati; Diaz, Jose D.; Ortiz, Javier A.; Fulton, Caleb

doi:10.1109/array.2016.7832571

Cited by 16 publications

(10 citation statements)

References 5 publications

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“…In the context of the in-situ calibration, step 1 consists in implementing (26) and (27) immediately after the initial calibration to obtain a factory standard status set of K r n | bef and K t n | bef values, while step 2 repeats the same procedure as step 1, but at the operation location, to obtain a new set of K r n | aft and K t n | aft values. Finally, to cover step 3 and calculate the amplitude and phase deviation from the factory standard use,…”

Section: A Adapted In-situ/self Calibrationmentioning

confidence: 99%

“…However, large phase errors are not expected to arise during operation, unless the active element antenna and/or electronics have been damaged, in which case, it should be neglected from the calibration. Also, expressions (26) and (27) are prone to error propagation, i.e., measurement errors, as noise or repeatability, are present on each K n,m term, and they will accumulate along the ratio path. In other words, the longer the ratio path, the greater the possibility of larger accumulated error.…”

Section: A Adapted In-situ/self Calibrationmentioning

confidence: 99%

“…Yet, the simulations assumed an array with an infinite ground plane, which is not a reality. Consequently, the impact of the discontinuities occasioned by the finite nature of physical arrays is unknown, and it is particularly more relevant for the case of a small 8 × 8 array [26].…”

Section: A Initial Calibrationmentioning

confidence: 99%

“…It is important to note that, instead of referencing to element 1, element 27 is used as the reference because of its central location. Next, the data set with the added perturbations was used to compute a set of K r n | aft and K t n | aft coefficients using (26) and (27), respectively. In a similar manner, to obtain a set of K r n | bef and K t n | bef values required for comparison, the data set collected during the initial calibration, (Section II-B), was used in conjunction with (26) and (27).…”

Section: B In-situ Calibrationmentioning

confidence: 99%

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Validation and Testing of Initial and In-Situ Mutual Coupling-Based Calibration of a Dual-Polarized Active Phased Array Antenna

et al. 2020

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This paper presents experimental results of an initial and in-situ mutual coupling calibration techniques of an active phased array antenna. The antenna is a dual-polarized 64-element C-band subarray panel equipped with an RF beamformer that enables mutual coupling measurements. Both techniques were implemented, tested and validated using a custom anechoic chamber and a radar backend. The implementation of a radar backend enables the in-situ validation of both methods. A conventional near-field calibration procedure, also known as park and probe, was used as a reference, in order to validate the proposed method. To quantify the calibration effectiveness of the mutual coupling-based techniques, the results are translated into phase and amplitude errors. It is found that the amplitude estimation of the tested initial technique is affected by edge effects, resulting in errors larger than 1 dB, whereas the phase estimation is less sensitive, yielding an overall root mean square error (RMSE) of 2.5 •. In contrast, the proposed in-situ technique is not affected by edge effects, and its estimation RMSE is less than 0.12 dB in amplitude and less than 0.75 • in phase. Mutual coupling-based calibration techniques are demonstrated to be very versatile, as they provide calibration methods for environments outside an anechoic chamber, and they also enable immediate feedback on the health of the system. INDEX TERMS Active phased array, calibration, component failure, mutual coupling, park and probe.

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Section: A Adapted In-situ/self Calibrationmentioning

confidence: 99%

Section: A Adapted In-situ/self Calibrationmentioning

confidence: 99%

Section: A Initial Calibrationmentioning

confidence: 99%

Section: B In-situ Calibrationmentioning

confidence: 99%

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Validation and Testing of Initial and In-Situ Mutual Coupling-Based Calibration of a Dual-Polarized Active Phased Array Antenna

et al. 2020

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“…An method, which is the expansion of projection matrix correction method in [3], is presented for the wideband PPAR [15]. In addition, because of the inevitable distortion of radiation pattern mainly resulting from the mutual coupling [16], the correction matrix using the theoretical pattern is not completely effective. To mitigate the effect of non-ideality on the polarization measurement, a pattern reconstruction method is put forward in [17], [18].…”

Section: Introductionmentioning

confidence: 99%

An Adaptive Direction-Dependent Polarization State Configuration Method for High Isolation in Polarimetric Phased Array Radar

Wang¹,

Yin²,

Pang³

et al. 2020

Preprint

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<div>High cross-polarization isolation (CPI) is crucial to the accurate polarization measurement using polarimetric phased array radar (PPAR). In this paper, we propose an adaptive direction-dependent polarization state configuration (AD2PSC) method to improve the polarization isolation. Compared with conventional fixed polarization state of radiated wave whether it is linear, circular or elliptical polarization state, our AD2PSC approach configures the polarization state on basis of beam steering. To achieve the adaptive configuration of magnitude and phase of the dual-polarization antenna, an improved steepest descent algorithm is put forward. To facilitate the uniform representation for the polarization measurement application of PPAR, the universal expressions of intrinsic and measured backscatter matrices are derived for arbitrary polarization state. The dualpolarization dipole array is used to assess the priority of our proposed method. Compared with the conventional approaches,</div><div>our approach could obtain higher CPI while being available for a larger scanning range. The configured CPI meets the specific polarization requirement for PPAR.</div>

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Bias Correction for Polarization Measurement in Phased Array Antenna Via Pattern Reconstruction Method

Wang

Pang

et al. 2019

IEEE Access

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A reconstruction technique of the antenna pattern for correcting the polarization measurement bias is proposed in this paper. In the case of the prior knowledge of patterns at some scanning angles, the pattern at other beam position can be estimated by application of the minimum norm least-square solution. Once the pattern is reconstructed, the corresponding projection matrix could be obtained in the presence of the mutual coupling and edge effects in the polarimetric phased array antenna. Thereby, the correction matrix for the polarization scattering matrix is repaired. A microstrip patch array antenna is designed to demonstrate the validity of the proposed method, and the performance of bias correction is manifested using several polarimetric variables. Specifically, the bias of differential reflectivity (Z b DR), the bias of linear depolarization ratio (L b DR) and the phase difference are less than 0.14 dB, 46.85 dB, 3.31 • in a wide scanning angle range, respectively.

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Edge diffractions impact on the cross polarization performance of active phased array antennas

Cited by 16 publications

References 5 publications

Validation and Testing of Initial and In-Situ Mutual Coupling-Based Calibration of a Dual-Polarized Active Phased Array Antenna

Validation and Testing of Initial and In-Situ Mutual Coupling-Based Calibration of a Dual-Polarized Active Phased Array Antenna

An Adaptive Direction-Dependent Polarization State Configuration Method for High Isolation in Polarimetric Phased Array Radar

Bias Correction for Polarization Measurement in Phased Array Antenna Via Pattern Reconstruction Method

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