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Phased-Array Antennas and Transmit / Receive Module Test

Application Notes

In applications as diverse as radar, radio astronomy and wireless communications, developers are using antenna arrays to enable beamforming. This technique provides benefits including enhanced spatial selectivity and greater resistance to interference.

To meet today’s most challenging scenarios, the latest designs use active electronically steered arrays (AESA). When characterizing these advanced arrays, it’s important to minimize any phase errors caused by the test system: better cross-channel phase coherence means greater precision in measurements and, ultimately, in beam positioning.

In today’s competitive business environment, it’s also essential to reduce overall test times. With high channel-count systems, there are two options: sequential measurements with a few test channels plus external switching, or simultaneous testing with many parallel measurement channels. For years, it has been possible to implement simultaneous testing using several large, benchtop vector network analyzers (VNAs). More recently, solutions based on modular AXIe and PXIe hardware are making it possible to implement time-saving parallel testing in less space—without sacrificing measurement performance.

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