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Geometry of the stretchable unbalanced loop antenna: , , , , , , , , , , , , , , and .
Photographs of the stretchable unbalanced loop antenna: (a) nonstretched antenna, (b) stretched antenna with 40% -axis elongation, (c) stretched antenna with 40% -axis elongation, (d) stretched antenna with biaxial elongation, (e) folded antenna, and (f) twisted antenna.
Simulated and measured of the stretchable unbalanced loop antenna within 2.0–2.8 GHz: (a) simulated (blue solid) and measured (red dashed) of the nonstretched antenna; (b) measured of the stretched antenna with 20% -axis (blue solid), 40% -axis (red dashed) and 20% -axis (black dotted), 40% -axis (violet dashdot) elongation. The at 2.4 GHz is marked by a cross on each curve.
Simulated and measured radiation patterns of the nonstretched (a) and stretched (b) antenna at 2.4 GHz. The corresponding coordinate system is depicted in Fig. 1. The antenna gain along and orientations is defined as and , respectively.
Measured radiation efficiency at 2.4 GHz and resonance frequencies of the stretched and nonstretched antenna.
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