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Search Results (4)

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Keywords = Spidron fractal

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11 pages, 2122 KiB  
Article
Low-Profile Spidron Fractal Dipole Antenna with a Ferrite-Loaded Artificial Magnetic Conductor for Manpack Applications
by Oh Heon Kwon and Keum Cheol Hwang
Appl. Sci. 2020, 10(24), 8843; https://doi.org/10.3390/app10248843 - 10 Dec 2020
Cited by 7 | Viewed by 3654
Abstract
In this paper, a Spidron fractal dipole antenna with a ferrite-loaded artificial magnetic conductor (AMC) is presented. By applying ferrite composed of nickel–zinc with a high permeability value, a compact AMC that operates in the broadband frequency range within the high-frequency/very-high-frequency/ultra-high-frequency (HF/VHF/UHF) bands [...] Read more.
In this paper, a Spidron fractal dipole antenna with a ferrite-loaded artificial magnetic conductor (AMC) is presented. By applying ferrite composed of nickel–zinc with a high permeability value, a compact AMC that operates in the broadband frequency range within the high-frequency/very-high-frequency/ultra-high-frequency (HF/VHF/UHF) bands was designed. A Spidron fractal-shaped dipole antenna with a quasi-self-complementary structure was designed and combined with a miniaturized ferrite-loaded AMC. This allowed the designed AMC-integrated dipole antenna to operate in a wide frequency band, covering the HF/VHF/UHF bands, with low-profile characteristics. A prototype of the proposed Spidron fractal dipole antenna with the AMC was manufactured and measured and found to meet low VSWR (voltage standing wave radios) specifications of <3.5 within the 20–500 MHz bandwidth range. The simulated and measured results are in good agreement. The size of the Spidron fractal dipole antenna with the AMC is 0.03×0.026×0.001λ3 relative to the wavelength of the lowest operating frequency. The received power of the Spidron fractal dipole antenna with the AMC was also measured when it was applied to relatively small applications, such as a manpack in this case. Full article
(This article belongs to the Special Issue Antenna Design for Microwave and Millimeter Wave Applications: Latest Advances and Prospects)
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10 pages, 674 KiB  
Article
Ferrite-Loaded Spidron Fractal Loop VHF Antenna for UAV Applications
by Won Bin Park, Young-Mi Park and Keum Cheol Hwang
Appl. Sci. 2020, 10(15), 5392; https://doi.org/10.3390/app10155392 - 4 Aug 2020
Cited by 3 | Viewed by 5302
Abstract
In this letter, an electrically small Spidron fractal loop antenna operating in the VHF band is proposed. The ferrite material, which consists of a nickel-zinc combination, is loaded into inside of the loop antenna to increase the gain of the antenna in the [...] Read more.
In this letter, an electrically small Spidron fractal loop antenna operating in the VHF band is proposed. The ferrite material, which consists of a nickel-zinc combination, is loaded into inside of the loop antenna to increase the gain of the antenna in the low frequency band. To minimize the magnetic loss of the ferrite in the high frequency band, the amount and configuration of the ferrite are optimized using a genetic algorithm. Through this optimization step, the amount of the ferrite is decreased to 37.5% and the gain of the antenna in the high frequency band is improved. The size of the proposed antenna is 0.0242 × 0.0242 × 0.0051 λL3 at the lowest operating frequency. The proposed antenna was fabricated to verify the performance, and the simulated and measured results are in good agreement. The measured peak gains varied from −31.6 to −1.9 dBi within the measured frequency band. To examine the performance of the proposed antenna mounted on an unmanned aerial vehicle model (UAV), the antenna on a UAV was also simulated and the results were discussed. The simulated realized peak gains of the antenna on the UAV and on flat ground are similar. Full article
(This article belongs to the Section Electrical, Electronics and Communications Engineering)
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12 pages, 1015 KiB  
Article
High-Gain Waveguide-Fed Circularly Polarized Spidron Fractal Aperture Antenna
by Son Trinh-Van, Thuy Nguyen Thi, Youngoo Yang, Kang-Yoon Lee, Kyung-Young Jung and Keum Cheol Hwang
Appl. Sci. 2019, 9(4), 691; https://doi.org/10.3390/app9040691 - 18 Feb 2019
Cited by 6 | Viewed by 4066
Abstract
A high-gain rectangular waveguide-fed aperture antenna that uses a Spidron fractal structure to produce circular polarization is proposed. The antenna consists of a Spidron fractal aperture etched onto the ground plane of a dielectric substrate that is directly excited by a WR (Waveguide [...] Read more.
A high-gain rectangular waveguide-fed aperture antenna that uses a Spidron fractal structure to produce circular polarization is proposed. The antenna consists of a Spidron fractal aperture etched onto the ground plane of a dielectric substrate that is directly excited by a WR (Waveguide Rectangular)-90 waveguide-to-coax adapter. A superstrate was implemented at an appropriate distance above the antenna to enhance the broadside gain significantly. An antenna prototype was fabricated and tested to validate the design. The measured impedance bandwidth for | S 11 | ≤ −10 dB is 9.89–11.58 GHz (15.74%). The corresponding measured 3 dB axial ratio (AR) bandwidth is 10.68–11.00 GHz (2.95%), and within the measured 3 dB AR bandwidth, a maximum realized gain of 9.59 dBic is achieved. The radiation patterns of the proposed antenna are presented and discussed. Full article
(This article belongs to the Section Electrical, Electronics and Communications Engineering)
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9 pages, 1283 KiB  
Article
3D-Printed Super-Wideband Spidron Fractal Cube Antenna with Laminated Copper
by Oh Heon Kwon, Won Bin Park, Sungwoo Lee, Jong Min Lee, Young Mi Park and Keum Cheol Hwang
Appl. Sci. 2017, 7(10), 979; https://doi.org/10.3390/app7100979 - 22 Sep 2017
Cited by 12 | Viewed by 8324
Abstract
In this paper, a 3D-printed super-wideband (SWB) Spidron fractal cube antenna is proposed. The Spidron fractal configuration is utilized as a self-complementary structure on each face of a 3D frame to attain SWB characteristics. The antenna is excited through a tapered microstrip balun [...] Read more.
In this paper, a 3D-printed super-wideband (SWB) Spidron fractal cube antenna is proposed. The Spidron fractal configuration is utilized as a self-complementary structure on each face of a 3D frame to attain SWB characteristics. The antenna is excited through a tapered microstrip balun for both mode transforming and impedance matching. A prototype of the proposed antenna, including the 3D frame fabricated with the help of a 3D printer and Spidron fractal patches made of copper tape, is experimentally verified. The measured −10 dB reflection ratio bandwidth is 34:1 (0.44–15.38 GHz). The peak gain varies from 3.42 to 9.29 dBi within the operating frequency bandwidth. The measured radiation patterns are nearly omnidirectional at all operating frequency bands. Full article
(This article belongs to the Special Issue 3D Printed Antennas)
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