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Open AccessArticle

A High Channel Consistency Subarray of Plane-Wave Generators for 5G Base Station OTA Testing

School of Electronic and Information Engineering, Beihang University (BUAA), Beijing 100191, China
Author to whom correspondence should be addressed.
Electronics 2019, 8(10), 1148;
Received: 12 September 2019 / Revised: 9 October 2019 / Accepted: 10 October 2019 / Published: 11 October 2019
A high channel consistency subarray of plane-wave generators (PWG) is described for fifth-generation (5G) base station (BS) over-the-air (OTA) testing. Firstly, the variation of the near field radiation characteristics of the subarray based on the feed amplitude and phase errors of the traditional power divider network is analyzed. The recommended amplitude and phase errors between channels are given. After that, a novel subarray which combines four pyramidal horn antennas and a compact 1:4 waveguide power divider is designed. The optimized perfectly symmetrical zigzag waveguide transmission lines are used to realize consistent power allocation among antenna elements. No intermediate pins are employed, which avoids the significant deterioration of channel consistency caused by assembly errors. The size of the subarray is 4.89 λ0 × 4.97 λ0 × 1.23 λ00 is the working wavelength corresponding to the subarray center frequency at 3.5 GHz). The VSWR < 1.5 impedance bandwidth covers 3.4 GHz to 3.6 GHz. The amplitude difference between the four elements of the subarray is less than 0.5 dB, and the phase difference is less than 3°. The simulated and measured results agree well in this design. View Full-Text
Keywords: waveguide power divider; subarray; OTA testing; 5G waveguide power divider; subarray; OTA testing; 5G
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Qiao, Z.; Wang, Z.; Miao, J. A High Channel Consistency Subarray of Plane-Wave Generators for 5G Base Station OTA Testing. Electronics 2019, 8, 1148.

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