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RISS 인기검색어
- 검색키워드
- 저자 : Sika Shrestha (검색결과 2 건)
- 무료
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- 유료
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A New Fractal-Based Miniaturized Dual Band Patch Antenna for RF Energy Harvesting
Shrestha, Sika,Lee, Seong Ro,Choi, Dong-You Hindawi Limited 2014 International journal of antennas and propagation Vol.2014 No.-
<P>The growth of wireless communications in recent years has made it necessary to develop compact, lightweight multiband antennas. Compact antennas can achieve the same performance as large antennas do with low price and with greater system integration. Dual-frequency microstrip antennas for transmission and reception represent promising approach for doubling the system capacity. In this work, a miniaturized dual band antenna operable at 2.45 and 5.8 GHz is constructed by modifying the standard microstrip patch antenna geometry into a fractal structure. In addition to miniaturization and dual band nature, the proposed antenna also removes unwanted harmonics without the use of additional filter component. Using a finite-element-method-based high frequency structure simulator (HFSS), the antenna is designed and its performance in terms of return loss, impedance matching, radiation pattern, and voltage standing wave ratio (VSWR) is demonstrated. Simulation results are shown to be in close agreement with performance measurements from an actual antenna fabricated on an FR4 substrate. The proposed antenna can be integrated with a rectifier circuit to develop a compact rectenna that can harvest RF energy in both of these frequency bands at a reduction in size of 25.98% relative to a conventional rectangular patch antenna.</P>
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Miniaturized Fractal Patch Antenna on Various Substrate
Sika Shrestha,Young-Gon Kim,Dong-You Choi 한국정보기술학회 2013 한국정보기술학회논문지 Vol.11 No.8
The conventional geometry of patch antenna is modified in various ways for its size reduction. The proposed method presents the application of fractal geometry in patch antenna for its miniaturization. A simple space filling fractal, Sierpinski carpet is etched on edge-fed rectangular shaped patch antenna and is iterated up to 3rd order. These four antennas are designed in three substrates: FR4 (?<SUB>r</SUB>=4.7; δ=0.019), FR4 (?<SUB>r</SUB>=4.4; δ=0.02), and Teflon (?<SUB>r</SUB>=2.2; δ=0.0009). All designed antennas resonated at 2.45㎓ with satisfying return loss, significant gain and fine impedance matching. A comparative analysis of patch antenna on different substrates on the basis of size reduction, impedance bandwidth and gain is presented. Simulation results of Sierpinski carpet iterations on three substrates and their comparison with the generator shows significant size reduction, without affecting antenna performance such as reflection loss, impedance matching, and antenna gain. It is observed that gain is highest for the substrate with lowest relative permittivity having a trade-off of greater size and low impedance bandwidth.
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