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Journal ArticleDOI

Design of inside cut von koch fractal UWB MIMO antenna

01 Nov 2017-Vol. 263, Iss: 5, pp 052043
About: The article was published on 2017-11-01 and is currently open access. It has received 1 citations till now. The article focuses on the topics: Koch snowflake.
Citations
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Journal ArticleDOI
TL;DR: The obtained simulated and measured results confirms suitable good matching acceptable Envelope Correlation Coefficient (ECC), efficiency, group delay, and radiation patterns, and a promising performance for the proposed MIMO antenna.
Abstract: A novel compact Ultra Wide Band (UWB) Multiple Input Multiple Output (MIMO) antenna with dual filtering property is proposed. Two monopole antennas with W-shaped and n-shaped slots on their radiating patch are arranged vertically to form the MIMO antenna topology. Each monopole is composed of a slotted radiating patch and a simple ground plane which yield band stop feature in Worldwide Interoperability for Microwave Access (WiMAX) and Wireless Local-Area Network (WLAN) frequency band. In the sequel, to enhance the isolation, a parasitic structure has been wiely embedded between two monopole antennas. Applying the aforementioned decoupling structure improves the isolation level from -17dB to -22dB. The proposed two-element MIMO antenna with vertical arrangement, covers UWB frequency range from 3.1 to 10.6 GHz with notches at WiMAX (3.3–3.8 GHz) and WLAN (5–6 GHz) bands. The inter element isolation is less than -22 dB and in most cases even is less than -25 dB over the entire operating frequency band. The obtained simulated and measured results confirms suitable good matching acceptable Envelope Correlation Coefficient (ECC), efficiency, group delay, and radiation patterns. All these gurantrees a promising performance for the proposed MIMO antenna.

13 citations

References
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Journal ArticleDOI
TL;DR: Some important properties of fractal arrays are introduced, including the frequency-independent multi-band characteristics, schemes for realizing low-sidelobe designs, systematic approaches to thinning, and the ability to develop rapid beam-forming algorithms by exploiting the recursive nature of fractals.
Abstract: A fractal is a recursively generated object having a fractional dimension. Many objects, including antennas, can be designed using the recursive nature of a fractal. In this article, we provide a comprehensive overview of recent developments in the field of fractal antenna engineering, with particular emphasis placed on the theory and design of fractal arrays. We introduce some important properties of fractal arrays, including the frequency-independent multi-band characteristics, schemes for realizing low-sidelobe designs, systematic approaches to thinning, and the ability to develop rapid beam-forming algorithms by exploiting the recursive nature of fractals. These arrays have fractional dimensions that are found from the generating subarray used to recursively create the fractal array. Our research is in its infancy, but the results so far are intriguing, and may have future practical applications.

441 citations

Journal ArticleDOI
TL;DR: In this paper, a tree-like structure on the ground plane is proposed for UWB MIMO/diversity antenna with a size of 35 × 40 mm2 operating at a frequency range of 3.110 GHz.
Abstract: A compact printed ultrawideband (UWB) multiple-input multiple-output (MIMO)/diversity antenna system (of two elements) with a size of 35 × 40 mm2 operating at a frequency range of 3.110.6 GHz is proposed. The wideband isolation can be achieved through a tree-like structure on the ground plane. The effectiveness of the tree-like structure is analyzed. Measured S-parameters show that the isolation is better than -16 dB (-20 dB in most of the band) across the UWB of 3.110.6 GHz. The radiation patterns, gain, and envelope correlation coefficient are also measured. The proposed antenna is suitable for some portable MIMO/diversity applications.

397 citations

Journal ArticleDOI
TL;DR: In this article, a design of circularly polarized antenna based on Koch fractal geometry is presented and experimentally investigated, and the antenna is fabricated on FR4 substrate with a size of $54 \times 54 \times 1.6\,\text{mm}^3$ ( $0.162 \lambda_{0}times 0.0048 \lambda_0}$ at 900MHz) and tested to validate the proposed design.
Abstract: In this study, a novel design of circularly polarized antenna based on Koch fractal geometry is presented and experimentally investigated. Circular polarization and size reduction are achieved by placing two asymmetric Koch fractal geometries on x- and y-planes of the single-probe-feed square radiator. Further, to tune resonant frequency around the 911-MHz, four arrow-shaped slots are inserted in diagonal axes of the square radiator. It is perceived that compact size of the antenna can be achieved by increasing the overall size of the arrow-shaped slots and indentation angles of Koch fractal geometry. The antenna is fabricated on FR4 substrate with a size of $54 \times 54 \times 1.6\,\text{mm}^3$ ( $0.162 \lambda_{0}\times 0.162 \lambda_{0}\times 0.0048 \lambda_{0}$ at 900 MHz) and tested to validate the proposed design. The 3-dB axial-ratio bandwidth and impedance bandwidth of the proposed antenna design are found to be 8 MHz (907.0–915 MHz) and 37.0 MHz (891.0–928.0 MHz), respectively. The measured results confirm that the proposed design covers US radio-frequency identification (RFID) band (902–928 MHz) and can be used for RFID short-range reading applications.

99 citations

Journal ArticleDOI
TL;DR: In this article, the authors proposed a novel technique to reduce the size of microstrip patch antennas by etching the patch edges according to Koch curves as inductive loading and inserting the Sierpinski carpets into the patch as slot loading.
Abstract: A novel technique to reduce the size of microstrip patch antennas is proposed. By etching the patch edges according to Koch curves as inductive loading, and inserting the Sierpinski carpets into the patch as slot loading, it is experimentally found that the resonant frequency of the patch can be greatly lowered, and the higher the iteration order of the fractal shapes, the lower the resonant frequency becomes. And this property can be utilized to reduce the size of the microstrip patch antennas. It is also found that, the radiation patterns of the proposed fractal-shaped antennas maintained because of the self-similarity and centro- symmetry of the fractal shapes. The patches derived from this technique can find applications in integrated low-profile wireless communication systems.

92 citations