Koch-Like Sided Sierpinski Gasket Multifractal Dipole Antenna

Abstract

Abstract-Koch-like fractal curve and Sierpinski Gasket are syncretized in minor-main way, forming so called Koch-like sided Sierpinski Gasket multifractal dipole (KSSG). Some iterative combinatorial cases of the two monofractals K i S j KSSG have been investigated in free space without feedline for revealing the assumed multifractal property. Then a pragmatical coplanar stripline (CPS) fed K 4 S 1 KSSG multifractal bow-tie dipole with dimension of 61.1 mm × 34.75 mm was designed, fabricated and measured. Six matched bands (S 11 < −10 dB) with moderate gain (2 dBi-6 dBi) and high efficiency (80%-95%) are obtained within band 1.5 GHz-14 GHz, of which f 1 = 2.137 GHz (1.978-2.287 GHz, 309 MHz, 14.46%, PCS1900 + IMT2000 + UMTS), f 2 = 4.103 GHz (3.916-4.2 GHz, 374 MHz, 9.12%, WiMAX), f 3 = 5.596 GHz (5.499-5.679 GHz, 180 MHz, 3.22%, WLAN + WiMAX) are commonly used. Gain patterns of these bands are all almost omnidirectional in Hplane (Phi = 0 • , XOZ) and doughnut-shaped in E-plane (Phi = 90 • , Y OZ), which suggests that K 4 S 1 KSSG operates as a half-wavelength dipole. It behaviors like the main fractal in low frequency and resembles the minor one in high frequency. The consistent results of simulation and measurement have evinced the multifractal antennas' peculiar properties and superiority over its monofractals in impedance uniformity, gain pattern, efficiency and dimension. So it is attractive to PCS, UMTS, WLAN, WiFi, WiMAX and other communication systems.

Multiband Multimode Arched Bow-Shaped Fractal Helix Antenna

“…in Table 1, number of multi-resonance of K i never shows the usual relationship of N = i + 1 [11,21]. Table 1).…”

“…So, it might have better radiation properties than Euclidean counterparts. So far, almost all fractal antennas utilizing fractal geometries that consist of straight segments, such as Koch curve series [10][11][12], Minkowski curve [13], Hilbert/Peano curve [14][15][16][17] or linearly-edged blocks like Sierpinski Carpet series [18][19][20][21][22]. Naturally, we conceive the idea of fabricating a fractal with curved elements, such as circular or elliptical arc with the hope of further enhancing the antenna's performances, like bandwidth, reflection coefficient, directivity, gain, and polarization.…”

A Novel Two-Layer Stacked Microstrip Antenna Array Using Cross Snowflake Fractal Patches

“…The intrinsic properties of fractal geometries are conducive to the miniaturization of antenna size and the realization of multiband or broadband characteristics [14][15][16][17][18][19][20].…”

Design of a Compact Quad-Band Hybrid Antenna for Compass/Wimax/Wlan Applications

“…Many kinds of multi-band antenna have been designed for the wireless local area network (WLAN) application in the 2.4 GHz (2.4-2.484 GHz)/5.2 GHz (5.15-5.35 GHz)/5.8 GHz (5.725-5.825 GHz) operating bands or the worldwide interoperability for microwave access (WiMAX) application in the 2.5 GHz (2.5-2.69 GHz)/3.5 GHz (3.3-3.8 GHz)/5.5 GHz (5. 25-5.85 GHz) operating bands, such as monopole antenna with multiple resonance strips [2,3] or parasitic elements [4,5], slot antenna [6,7], PIFA [8], fractal antenna [9], and dipole antenna [10][11][12], etc.. Although a great variety of studies about multiband antenna meeting the demands of WLAN or WiMAX applications have been reported, the subject about quad-band antenna for Compass B3 (1.256-1.278 GHz) or GPS, WiMAX and WLAN applications is seldom proposed.…”