Various Base Station (BS) Antennas
Characterize the antenna array elements through measurements and simulations
- Utilized a large non-reflective open antenna range for far-field testing. Due to the large size of the arrays, a sufficiently large distance between the antenna and the receiving horn antenna had to be provisioned. The horn antenna had to be calibrated for that distance.
- Built a heavy-duty remote-controlled rotating antenna stand for high-precision automated antenna pattern measurement process.
- Removed radomes. Identified and isolated the elements of interest.
- Connected coaxial 50Ω pig-tails to the inputs of each element.
- Isolated all ports from the arrays’ backplane signal distribution network
- Utilized a signal generator, a spectrum analyzer and a vector network analyzer (VNA) to capture measurement data.
- Performed radiation pattern measurements over each operating band in horizontal and vertical planes for both orthogonal polarization ports’ co-polarized field by completing a 360-degree azimuth sweep and a 360-degree elevation sweep in 5-degree steps.
- Prepared 2-D pattern plots at each required frequency band.
- Measured input impedance over the same operating bands using a calibrated VNA. Plotted Smith Chart and graph of reflection coefficient (return loss) vs. frequency.
- CAD models were developed to represent each antenna element and its surrounding elements and structures.
- HFSS Simulations were run to calculate the resulting antenna patterns and return loss. Comparisons were made with antenna measurements performed earlier.
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