What is it about?
Originally, antennas were designed and characterised in free space. It is now recognised that the performance can be significantly changed by the operating environment. For on-body communications, the body introduces frequency detuning and impedance mismatch; hence, antennas must be characterised in situ on the body. This article reviews the historical development of on-body antenna measurements, then describes a study into the effect of using standard measurement equipment (such as coaxial cables and a vector network analyser) on the observed performance, compared to measurements taken using an embedded system representing the end-use device.
Why is it important?
This paper demonstrates that the use of standard measurement techniques can introduce a bias in the results, such that differences in performance will be experienced in a real device. Whilst not suggesting that traditional methods be replaced, it is believed that embedded system measurements offer a complementary characterisation option for device performance optimisation and final design verification. The results in the paper are indicative of the potential differences that can occur.
The following have contributed to this page: Dr Robert N Foster