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Fig. 5 shows the result of measuring the radiation pattern. With the flat antenna, the H-plane (y-z plane) shows an omnidirectional pattern and the maximum gain was -4dBd (Fig. 5a). With the U-bent antenna, the H-plane (y-z plane) maintained the omni-directional characteristic and the E-plane (x-z... 顯示更多 Fig. 5 shows the result of measuring the radiation pattern.
With the flat antenna, the H-plane (y-z plane) shows an omnidirectional
pattern and the maximum gain was -4dBd (Fig. 5a).
With the U-bent antenna, the H-plane (y-z plane) maintained
the omni-directional characteristic and the E-plane (x-z plane)
showed a little gain increase at the 90 deg., but by and large
maintained the characteristic of the flat antenna. The
maximum gain was -5dBd (Fig. 5b). The characteristic of the
antenna bent and worn on the wrist was measured in two
cases: one where the antenna was placed on the side of the
waist (Case I), and the other where the wrist was placed in
front of the stomach (Case II). As a result of the
measurements, in Case I, there appeared a radiation
characteristic that was less affected by the human body. In
Case II, the characteristic obtained was one which the back
lobe was suppressed by the effect of the human body.
However the gain at the 0 deg. was -7.5 dBd in both cases
(Fig. 5c).

This study has proposed a wrist-wearable antenna for the
UHF band RFID system. It was designed as a low-profile
antenna with a ground plane in order to minimize the effect by
the human body and improve its wearability. For impedance
matching, a flat stub antenna was used, which was reduced in
size to 15mm wide, 100mm long, and 0.6mm high. With the
antenna worn on the wrist, there was little change in the
resonant frequency and the maximum gain was -7.5dBd.
Those results confirm that the MLMA suggested by this study
is appropriate for a wrist wearable antenna for the UHF band.
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