Wearable Antenna Jenis Mikrostrip dengan Struktur Electromagnetic Band Gap (EBG) untuk Komunikasi Wireless pada Tubuh
Keywords:
wearable antenna, mikrostrip, electromagnetic band gapAbstract
Wearable antenna jenis mikrostrip merupakan salah satu teknologi komunikasi nirkabel untuk tujuan pemantauan pada manusia yang dapat terintegrasi dengan pakaian serta menjaga kenyamanan pengguna. Akan tetapi, antena mikrostrip memiliki sejumlah kelemahan seperti gain dan efisiensi yang rendah, lebar pita sempit serta adanya gelombang permukaan yang dapat merusak pola radiasi. Selain itu, penggunaan wearable antenna memungkinkan terjadinya efek mutual coupling antara tubuh dengan antena yang dapat mengubah frekuensi kerja, penurunan kinerja antena dan efek radiasi pada tubuh. Berdasarkan permasalahan di atas, diberikan struktur Electromagnetic Band Gap (EBG) dengan unit cell berbentuk Mushroom-like EBG dan via pada bagian tengan EBG. Penggunaan struktur EBG tersebut dapat meningkatkan efisiensi, mengurangi efek mutual coupling, menghasilkan pola radiasi yang lebih baik serta mengurangi efek radiasi pada tubuh. Pengujian dilakukan pada antena tanpa struktur EBG dan dengan struktur EBG pada rentang lebar pita 10-100 MHz untuk frekuensi kerja 3,5 GHz 5G Band (n78 3500 MHz) dan nilai SAR ≤ 1,6 W/Kg. Didapat nilai VSWR <2, return loss ≤-10, lebar pita >30 MHz dan gain >5 dB.
The microstrip wearable antenna is a wireless communication technology for monitoring the human body that can be integrated with clothing and maintain user safety and comfort. However, microstrip antenna have some disadvantages such as low gain and efficiency, narrow bandwidth and surface waves that can destroy the radiation pattern. In addition, the use of a wearable antenna possibly makes a mutual coupling effect between the body and the antenna which can change the resonant frequency, decrease the performance of the antenna and the effect of radiation on the body. Based on these problems, an Electromagnetic Band Gap (EBG) structure was added with a unit cell in the shape of a Mushroom-like EBG and a via in the centre of the EBG the antenna design. The use of the EBG structure can increase efficiency, reduce the effect of mutual coupling, produce a better radiation pattern and reduce the effects of radiation on the body. The study was carried out on antennas without EBG structure and with EBG structure in a bandwidth range of 10-100 MHz for a resonant frequency of 3.5 GHz 5G Band (n78 3500 MHz) and a SAR value less than 1.6 W/Kg. The value of VSWR <2, return loss ≤-10, bandwidth >30 MHz and gain >5 dB.
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References
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