A Study on Dual-Polarization Broadband Antenna Array Covered with EM Wave Absorber
Abstract:
The CTIA test plan clearly specifies that up to 16 sets of dual-polarized antennas must be installed in the MIMO OTA EM wave anechoic chamber as an important condition for multi-channel OTA measurement. In this paper the authors use two FRP-4 PCBs each with parallel Vivaldi antennas and assembly crossing at 90° to form a dual-polarized compact broadband antenna with a very small cross-sectional area, allowing it to operate over a wide range from 0.7 to 6.0 GHz. They also use a microstrip power splitter to design the antenna array. The authors are very skillful in using two parallel antennas on each PCB to increase the directional gain of EM wave propagation, which also improves the isolation between vertical and horizontal polarized antennas. In this paper due to the authors' special design method, the isolation between the vertical and horizontal polarized antennas is as high as approximately 40 dB. The authors also use a foam cone EM wave absorber to cover this compact wideband antenna array to prevent multipath reflections and reduce signal interference outside the propagation direction of the antenna array. When the MIMO OTA anechoic chamber is installed with multiple antennas designed by the authors and simultaneously transmits EM wave, stable measurement results can be obtained.
Keywords:
Antenna array, Vivaldi, Dual polarization, Broadband antenna
pages:
119-122
DOI:
10.35745/icice2018v2.030
Year:
2018
Published in:
2nd International Conference on Information, Communication and Engineering (ICICE 2018)
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