McCormack, Justine (2010) Non-Radiative Calibration of Active Antenna Arrays. PhD thesis, National University of Ireland Maynooth.
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Abstract
Antenna arrays offer significant benefits for modern wireless communication systems
but they remain difficult and expensive to produce. One of the impediments of utilising
them is to maintain knowledge of the precise amplitude and phase relationships between
the elements of the array, which are sensitive to errors particularly when each element
of the array is connected to its own transceiver. These errors arise from multiple
sources such as manufacturing errors, mutual coupling between the elements, thermal
effects, component aging and element location errors. The calibration problem of
antenna arrays is primarily the identification of the amplitude and phase mismatch, and
then using this information for correction.
This thesis will present a novel measurement-based calibration approach, which uses a
fixed structure allowing each element of the array to be measured. The measurement
structure is based around multiple sensors, which are interleaved with the elements of
the array to provide a scalable structure that provides multiple measurement paths to
almost all of the elements of the array. This structure is utilised by comparison based
calibration algorithms, so that each element of the array can be calibrated while
mitigating the impact of the additional measurement hardware on the calibration
accuracy. The calibration was proven in the investigation of the experimental test-bed,
which represented a typical telecommunications basestation. Calibration accuracies of
±0.5dB and 5o were achieved for all but one amplitude outlier of 0.55dB. The
performance is only limited by the quality of the coupler design. This calibration
approach has also been demonstrated for wideband signal calibration.
Item Type: | Thesis (PhD) |
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Keywords: | Non-Radiative Calibration; Active Antenna Arrays; |
Academic Unit: | Faculty of Science and Engineering > Electronic Engineering |
Item ID: | 2281 |
Depositing User: | IR eTheses |
Date Deposited: | 30 Nov 2010 11:59 |
URI: | https://mu.eprints-hosting.org/id/eprint/2281 |
Use Licence: | This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here |
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