White Paper: Test & Measurement

Measuring Multi-Antenna Isolation Using a Multiport VNA

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The proliferation of wireless technology is leading to higher densities of Radio Frequency (RF) transmitter and receiver antennas on many platforms. A single platform – such as an automobile, police car, airplane, or military platform – can have numerous antennas that are located in relatively close proximity to one another.

In this application note, antenna-to-antenna isolation using a Rohde and Schwarz multiport Vector Network Analyzer (VNA) is analyzed. These antenna-to-antenna isolation measurements are presented in generalized real-world deployments that are applicable to Internet of Things (wireless refrigerators, stoves, etc.), automobiles, aircraft, tanks, submarines, boats and ships, etc. Knowing the actual antenna-to-antenna isolation allows engineers to assess the filtering requirements in wireless receivers, in addition to mitigating Cosite Interference issues at the Platform Level and in System Integration.

While it is possible to analyze electrical lengths and errors and speculate on the outcome, the best way to evaluate an outcome is by conducting an actual test. Engineers and technicians are encouraged to evaluate their situation and come to their own conclusion by performing evaluations with VNA demonstration units. The best way to evaluate if a high-performance Rohde and Schwarz ZNBT VNA can help reduce product failure rates and test times is by performing an in-house evaluation.

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