Compact Microstrip Antennas With Enhanced Bandwidth for the Implanted and External Subsystems of a Wireless Retinal Prosthesi
| Autor: | Gholamhosein Moloudian, Seyyed Reza Miri-Rostami, Toni Bjorninen, Siroos Bahrami |
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| Rok vydání: | 2021 |
| Předmět: |
Physics
business.industry Frequency band Bandwidth (signal processing) Specific absorption rate 020206 networking & telecommunications 02 engineering and technology Microstrip Imaging phantom Microstrip antenna Planar Optics 0202 electrical engineering electronic engineering information engineering Wireless Electrical and Electronic Engineering business |
| Zdroj: | IEEE Transactions on Antennas and Propagation. 69:2969-2974 |
| ISSN: | 1558-2221 0018-926X |
| Popis: | In this communication, two pairs of compact microstrip antennas were introduced for a dual-unit retinal prosthesis operating at two frequencies of 1.45 and 2.45 GHz. For the 2.45 GHz frequency band, a triangular microstrip antenna with shorting pin and 7 mm $\times6.93$ mm $\times0.63$ mm dimensions is explored to enhance the intraocular element bandwidth. Also, a modified rectangular patch (26 mm $\times24$ mm $\times1.43$ mm) with parasitic radiators is employed for the extraocular element. In the 1.45 GHz frequency band, another triangular microstrip intraocular element (6.25 mm $\times6$ mm $\times0.63$ mm) is proposed by etching a series of slots, which results in lower resonance frequency. For the extraocular element at 1.45 GHz, a planar inverted-f antenna (PIFA) (28 mm $\times24$ mm $\times1.43$ mm) with parasitic radiators is introduced. The effectiveness of intraocular and extraocular antennas was evaluated through simulation and further examined by fabricating to characterize the performance in a wireless system inside eye phantom. Specific absorption rate (SAR) analysis of the proposed antennas, results of the simulation, and experimental coupling measurements are presented. Compared with others’ work in this problem, with this proposed structure, we could enhance the impedance bandwidth up to 36% without compromising the coupling, which is advantageous for high-resolution retinal prosthesis. |
| Databáze: | OpenAIRE |
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