| Nowdays, the information network has penetrated into every part of society, and is going deep into the space and the human body. Recently, the wearable devices,such as wearable glasses and smart brackets, are emerging into our daily life.Moreover, the researches of wearable antenna, which is a key part of the wearable device, has also made great progress,including the invert-F antenna, button antenna,slot antenna, half-mode substrate-integrated cavity antenna, and microstrip patch antenna etc. The focuses of most reseaches on the performance change because of washing, bending, stretching, and crumpling in the practical situation. However, this paper focuses on suddenly broken situation because of the aging or be cut etc. And this is modeled by slicing the patch or ground into independent strips along the current direction. The studies of major innovative structure are as follows.(1) The strip-patch microstrip antenna. There are two methods to slice the patch along its current direction into 5 independent pieces with the same dimensions, and then investigate the performance of antenna by adjusting the gaps. One keeps the total area of strips to be the same as the original solid patch, while just chang the positons of the strips by the gaps; the other doesn't change change the position of original patch but slice the gaps in the patch. The results show that, if the electrical length of one gap is less than 2%, the antenna performance is affected little; whereas, if it is extended to be 4%, the corresponding resonance, pattern and realized gain are changed obviously(2) The slice-patch textile antenna using sparse flexible textile as substrate. It is different from the conventional design of textile antenna using the thick dense material as substrate, the substrate of this desin has the thin sparse flexible material,and its double-layered thickness is just 0.008 ?0. In addition to studying the performace of flat antenna, the conformal performances are also studied, the insight of performance change is analyzed by comparing the simulations with the corresponding measured results. It shows that the performance is affected easily by the textile but the antennas have good radiation characteristics.(3) The strip-ground rectangular microtrip patch antenna. Firstly, the original solid ground is sliced along the current direction into 5 pieces with the same widths,while the middle strip remains the same but changing the other strips by adjusting the gaps. The effect of coaxial cable is studied in detail for this situation. The corresponding results indicate the sliced antenna won't have dual-band characteristic if the gap ratio of the gap to the solid ground is less than 1:4. Secondly, the ground with 3 strips is studied as well, where the middle strip is constant but changing the other two strips according to the gaps. The antenna can still work when the gap ratio up to 3:4 if the gaps are widened as possible as it can.(4) The strip-ground and strip-patch microstrip patch antenna. Here both the ground and the patch are sliced into 5 strips according to the previous methods,respectively. From the comparisons, the results show that the effect of coaxial cable to the antenna doesn't have a periodicity and the back radiation is not affected by the slicing. |
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