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Generating Multiple Phase Coherent Signals–Aligned in Phase and Time

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Application Note

Generating Multiple Phase Coherent Signals Aligned in Phase and Time - RF CafeMay 14, 2019 - Testing multi-antenna systems such as phased array or beamforming antennas requires a test system capable of providing multiple signals with constant phase relationships between them. The coherent test signals must have a specific or definable phase difference (relative phase) and definable amplitude. Some of the challenges for such a test system include compactness, phase control capability and simplicity in handling. In particular, phase stability between the channels is of importance.

This Generating Multiple Phase Coherent Signals–Aligned in Phase and Time application note explains how to generate phase coherent signals. It details what to consider and how to configure the test setup and describes in detail how to best calibrate the relative phases and timing between the individual channels and when to repeat the calibration.

Testing multi-antenna systems such as phased array or beamforming antennas requires a test system capable of providing multiple signals with constant phase relationships between them. The coherent test signals must have a specific or definable phase difference (relative phase) and definable amplitude. Some of the challenges for such a test system include compactness, phase control capability and simplicity in handling. In particular, phase stability between the channels is of importance. Many applications in the A&D direction finding and mobile communications beamforming sectors demand that the phase relationships between channels be constant over time with minimal deviations, for example as little as <1° phase drift. Such high phase stability can only be achieved when using a common synthesizer signal (local oscillator, LO) for all signal generators in a test system.

Rohde & Schwarz signal generators present a compact easy-to-use solution for generating phase coherent signals. The generators' phase coherence option enables LO coupling of multiple instruments by distributing the synthesizer signal of one instrument to the others. Different generator models can be coupled to optimally fit user requirements in terms of number of phase coherent channels and RF frequency range. The Rohde & Schwarz solution is therefore flexible and scalable. Generating Multiple Phase Coherent Signals–Aligned in Phase and Time application note

 

About Rohde & Schwarz

Founded more than 80 years ago, Rohde & Schwarz is one of the world's leading manufacturers of information and communications technology products for professional users. Initially focusing on RF engineering and RF applications in test and measurement, radiocommunications and broadcasting, the company has continually expanded its fields of activity over the past decades . In the meantime Rohde & Schwarz has also become one of Germany's largest manufacturers of IT security products.

 

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Rohde & Schwarz USA, Inc.
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+65 65 13 04 88
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Posted May 16, 2019

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