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A 4×4 dual-band MIMO Fractal-PIFA antenna with high isolation is designed and fabricated. The antenna operates at 2.6 GHz and 5 GHz with large bandwidth of 13.4% and 20.4% resprctivrly for wide-band applications in portable terminals. Based on self affinity and lengthened shorting pin of PIFA structure, the single antenna is miniaturized up to nearly 90% comparing to traditional patch one. Being on...
In this paper, a novel design of a stacked two layer microstrip patch antenna with wideband characteristics is proposed. This paper follows fractal and stacking methodology to improve the characteristics of microstrip antennas. This antenna consists of two circular patches. The upper radiating patch is suspended with Teflon clamps over the lower driving element. The radiating patch is excited through...
In this paper, sierpinski-shaped dipoles are introduced in a printed log-periodic dipole antenna design. A Log Periodic Sierpinski Antenna (LPSA) is developed and the characteristics studied. Antenna size is considerably reduced, still maintaining the overall performance characteristics. The results are compared with that of a standard printed LPDA. A set of shapes of LPSA are studied and the observations...
A reduced size of Log Periodic Fractal Koch Antenna (LPFKA) with C-shaped stub is proposed in this paper mainly for Television White Space Spectrum (TVWS) applications which operate from 0.47 GHz to 0.79 GHz. The proposed antenna has a dimension of 285 mm x 220 mm which planned on FR-4 substrate with dielectric constant of εr = 4.7, loss tangent of tan δ = 0.019 and thickness...
In the present paper, a novel coplanar wiveguide (CPW)-fed printed fractal-shaped slot antenna for bandwidth enhancement is presented. The proposed antenna is composed of a wide fractal-shaped slot and an hexagonal parasitic patch fed by a CPW Feed. The combination of the fractal concept and CPW-fed technique allows to improve the characteristics of the proposed antenna significantly. The simulation...
This paper presents the design of a compact size Sierpinski carpet fractal antenna, operating in C-band with two resonant frequencies of TV satellite system, namely (3.625 – 4.2) GHz, and (5.85 – 6,425) GHz. Antenna is designed on FR4 microwave laminate, with return loss S11<−18 dB. Bandwidth of antenna is BW> 80 MHz, for VSWR<2, at 50 ohm input impedance. To achieve compact size, despite...
This paper discussed about the effect of different substrates on slotted Log Periodic Fractal Koch Antenna (LPFKA). This log periodic antenna is comprised of ten radiating elements with titled slot angles and placed on both sides of the substrate in crisscross arrangement. This LPFKA was designed at frequency between 0.47 GHz and 0.79 GHz which focus on UHF TVWS bands. A comprehensive study between...
A super J-pole antenna with two fractal Koch curve shaped elements is proposed in this paper. In order to increase the bandwidth and to provide the proper phasing of the currents in the antenna elements a duplexer type phasing section is designed. The antenna performances (radiation patterns, VSWR and gain) are simulated and optimized for GSM-1800, UMTS-2100 and Wi-Fi 2,4 GHz bands. Fractal J-pole...
Awideband CPW-fed fractal antenna is developed from the existing design with improved bandwidth, gain and efficiency. It is found that the antenna can offer a wider bandwidth even when the size is 24mm∗25mm. Also the use of fractal geometry increased the perimeter of the radiator and use of similar geometries within the available space enhanced the bandwidth. The return loss at the resonant frequencies...
This paper presents the design of a ultra-wideband monopole antenna based on fractal geometry. The proposed antenna is essentially composed of a hexagonal patch fed by a coplanar waveguide (CPW) Feed. To improve the characteristics of this antenna, trapezoidal shaped elements are added on his sides. This monopole fractal antenna is designed on RO4350B substrate having dielectric constant εr=3.66,...
In this paper, a new microstrip antenna is proposed for wireless applications on S and C bands. A log-periodic fractal Koch structure is selected to research. A new antenna is designed and simulated before optimizing. The results achieve the purpose of increasing the bandwidth and reducing the size of the antenna. The antenna also has high gain and is fabricated on the Duroid RO4700JXR substrate instead...
The paper presents a compact coplanar waveguide (CPW)-fed ultra-wideband (UWB) printed antenna with a dual band rejection. Implemented with developed fractal structures-based Koch shape, the proposed antenna uses a complementary split ring resonator (CSRR) etched into a single layer to obtain the dual band-notched function. Also integrated with a new feeding method, four different antenna designs...
In this paper, two novel star shaped fractal monopole antenna with circular and hexagon slots and semi-elliptical ground are presented for ultra-wideband applications. The designed antennas have a compact dimension of 20 × 21 × 1 mm3. A 50 ohm impedance matched microstrip feed line having width 1.9 mm is used to excite both the antennas. A wide bandwidth of 8.67 GHz is obtained starting from 4.4 GHz...
A fractal tree monopole antenna is presented. The antenna consists of three iterations of a branching cone pattern over an oblate spheroidal ground. This structure was simulated in Ansys HFSS, and simulation results are given, showing broadband operation beginning at 1.2 GHz and extending beyond 20 GHz. Radiation patterns are shown at 5.5 GHz and at 10 GHz, with co-polarization and cross-polarization...
This paper presents the implementation of a fractal based defected ground structure DGS to reduce the interaction between two closely spaced planer monopole patch antennas. The design achieves a −7 dB reduction in mutual coupling level with antennas' edge to edge separation of λo /25 over a bandwidth of 51.8 % (2 – 3.4) GHz in which the reflection coefficient is less than −10 dB and a realized total...
This paper presents a low profile sierpinski fractal antenna for ultra wide band applications. The proposed antenna is designed by incorporating sierpinski fractals inside a circular ring of width 1mm which improves the impedance band width and radiation efficiency of the antenna. The proffered antenna of dimensions 29×28×1.6 mm3 covering the frequency range of 3.7 to 14.3 GHz with radiation efficiency...
In this paper, a modified fractal Sierpinski Antenna is proposed for wireless applications. The antenna under investigation is fed by a 50 ohm microstrip line. The basic shape of the fractal antenna is a triangle which is modified with a hexagon slot and iteration of self similar design. Wide bandwidth of 3.05 GHz and 2.4 GHz is obtained between 2.85–5.9 GHz and 9.5–11.9 GHz respectively. Various...
A miniaturized CPW-fed dodecagram fractal antenna is designed for multiband applications having multiple resonant frequencies. The antenna is designed by a combination of two geometries, do-decagram and a circle within. This is resulted in improved radiation pattern, a good gain and higher efficiency with multiple resonances in useful frequency bands. The use of defected ground structure (DGS) and...
The Fractal geometries have unique properties such as space filling and self similarity. For achieving the desired miniaturization, multi-band and wideband properties the fractal geometries have been exploited in antenna designing. The paper proposes a novel geometry called as modified Sierpinski fractal for better performance as compared to the traditional existing Sierpinski geometry. The proposed...
A novel microstrip fed hexagonal shaped antenna for Ultra Wide Band (UWB) applications with WiMAX band-notch characteristics is proposed in this work. The proposed antenna covers the entire UWB bandwidth of 3.1 to 10.6 GHz with band rejection in the WiMAX frequency of 3.5 GHz. The rejection in WiMAX range reduces interference between UWB and WiMAX band. Band rejection is achieved by etching complimentary...
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