On Uncertainty Investigation of mmWave Phased Array Element Control with an All-on Method

Huaqiang Gao, Wei Fan*, Weiming Wang, Fengchun Zhang, Zhengpeng Wang, Yongle Wu, Yuanan Liu, Gert Frølund Pedersen

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Abstrakt

Accurate control of complex excitation of array
elements is key to ensure spatial discrimination capability of
millimeter-wave (mmWave) phased array, e.g. beamforming to
target signal directions and nulling towards interference signal
directions. Element excitation uncertainties are typically evaluated
in an “on-off” mode, where the element under test is
enabled with other phased array elements properly terminated.
However, such an “on-off” method might lead to inaccurate
results due to the fact that mmWave phased arrays are typically
designed for an “all-on” mode, where all array elements are
enabled with proper complex excitations. Therefore, there is
a need to accurately determine the array element excitation
uncertainties in its typical operation mode, i.e. “all-on” mode.
In this letter, an “all-on” method is proposed to enable accurate
array element uncertainty investigation in the “all-on” mode.
The proposed algorithm is experimentally validated in a 44
mmWave phased-array experimental platform. The experimental
results have shown that an amplitude deviation up to 0.1 dB
and a phase deviation 1 can be achieved in the “all-on” mode
with the proposed method, compared to those up to 0.8 dB and
9, respectively for the conventional “on-off” method.
OriginalsprogEngelsk
TidsskriftI E E E Antennas and Wireless Propagation Letters
ISSN1536-1225
DOI
StatusUdgivet - apr. 2020

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