Hubregt J. Visser, PhD, Holst Centre – IMEC-NL
Antennas, when brought into close proximity with RF reflective objects or lossy human tissue,
will show a degradation in performance. This degradation is visible in the input impedance as a
function of frequency and in the radiation pattern, gain and efficiency. In the presentation we will
show two examples of miniature antennas designed for on-body use that exhibit a negligible
performance degradation when brought near or onto the human body. One of the examples
comprises a miniature, curved microstrip patch antenna for application on the wrist, see Figure 1.
Here, the ground plane of the patch antenna has been used to form a shielding between antenna
and environment. The other example is a CPW printed monopole antenna, embedded in a low-loss
dielectric body to contain the fields and thus minimize reactive tuning, see Figure 2. Furthermore the
short ground plane of this antenna has been modified to suppress coaxial cable current radiation. In
the designs, the human body has been modeled as a curved, layered medium consisting of skin, fat,
muscle, bone and, when appropriate, dura, cerebrospinal fluid and brain tissue. The CSTMWS designs,
the realized prototypes and the measurement results will be presented.
Figure 1: Curved microstrip patch antenna
for use on the wrist.
Figure 2: Printed monopole antenna in
proximity to the human body.
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