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• W2185507029 abstract "A dual-mode slotted microstrip patch resonator is introduced in this paper for use in wireless communication applications. The slot structure, etched inside the patch resonator, is in the form of the 2nd iteration Koch fractal curve; using the conventional square microstrip patch resonator as the initiator. Modeling and performance evaluation of the proposed fllter design have been carried out using a method of moment based EM simulator, IE3D. Simulation results show that the resulting resonator fllter has good transmission and return loss responses. The modeled resonator has been found to possess a side length of about 0.22 the guided wavelength, which represents a size reduction of about 81% as compared with that based on the conventional square microstrip patch without slot. In addition, slits have been symmetrically etched in the external edges of the patch structure, in an attempt to provide the resonator with tuning facility. Besides the tuning possibility, these slits have been found to ofier further size reduction without worsening the resulting fllter performance; providing the designer with more degrees of freedom. 1. INTRODUCTION Among the earliest predictions of the use of fractals in the design and fabrication of fllters is that of Yordanov etal. (1). Their predictions are based on their investigation of Cantor fractal geometry. Since then, dramatic developments in wireless communication systems have presented new chal- lenges to design and produce high-quality miniaturized components. These challenges stimulate microwave circuits and antennas designers to seek out for solutions by investigating difierent fractal geometries (2{6). Hilbert fractal curve has been used as a defected ground structure in the design of a microstrip lowpass fllter operating at the L-band microwave frequency (2). Sierpinski fractal ge- ometry has been used in the implementation of a complementary split ring resonator (3). Split ring geometry using square Sierpinski fractal curves has been proposed to reduce the resonant frequency of the structure and achieve improved frequency selectivity in the resonator performance. Koch fractal shape is applied to mm-wave microstrip bandpass fllters integrated on a high-resistivity Si substrate. Results showed that the 2nd harmonic of fractal shape fllters can be suppressed as the fractal factor increases, while maintaining the physical size of the resulting fllter design (4). Based on Peano fractal geometry, a miniaturized multi-resonator bandpass fllter with 2nd harmonic re- duction has been reported in (7). Minkowski type fractal geometry has been successfully used in producing high performance miniaturized dual-mode microstrip bandpass fllters (8,9). In this paper, a new dual mode slot microstrip square patch resonator bandpass fllter is pre- sented. The slot has a square structure with its four edges have been modifled by applying Koch pre-fractal curve to each of them. This produces successive miniaturized design structures for the dual-mode microstrip bandpass fllters as compared with those based on the conventional square patch microstrip resonator. The resulting bandpass fllters are supposed to have noticeably miniatur- ized sizes with adequate re∞ection and transmission responses. In addition, the proposed bandpass fllter can be further miniaturized by inserting slits in the resonator outer structure. These slits have the role of tuning besides miniaturization." @default.
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• W2185507029 date "2012-01-01" @default.
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• W2185507029 title "A New Tunable Dual-mode Bandpass Filter Design Based on Fractally Slotted Microstrip Patch Resonator" @default.
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