CPW-Fed Koch Fractal Slot Antenna for WLAN/WiMAX Applications

Krishna, Deepti Das; Gopikrishna, M.; Anandan, C.; Mohanan, P.; Vasudevan, K.

doi:10.1109/lawp.2008.2000814

Cited by 116 publications

(53 citation statements)

References 12 publications

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“…One method is to use different geometries of slots [9][10][11][12][13][14][15][16], and the other techniques use several tuning stubs to achieve wideband performance [17,18]. Among different slot geometries, those worthwhile mentioning are binomial-curve [9], annular-ring [10], fractal [11], rhombus [12], elliptical and circular [13], rectangle [14], triangle [15], and square [16]. The impedance bandwidths of these antennas are less than 104%.…”

Section: Introductionmentioning

confidence: 99%

A Compact Uwb Antenna Design Using Rounded Inverted L-Shaped Slots and Beveled Asymmetrical Patch

Dastranj¹,

Bahmanzadeh²

2018

PIER C

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Abstract-A compact ultra-wideband (UWB) antenna with simple structure is presented. To achieve UWB performance with a compact size, two open ended rounded inverted L-shaped slots are etched on the square ground plane. Moreover, further bandwidth enhancement is obtained by cutting a bevel on the asymmetrical radiating patch. The antenna is fed by a 50 Ω microstrip line and has a small size of 28 × 28 × 1.6 mm 3 . The simulation time-and frequency-domain results obtained from HFSS simulator package are verified by experimental measurements. Both simulated and measured results show that the antenna can provide a wide impedance bandwidth of more than 129% from 2.7 to 12.55 GHz with −10-dB reflection coefficient. Besides, it is shown that by introducing several antenna designs, the impedance bandwidth can be enhanced from 58% to 129%. The effects of the key design parameters on the antenna impedance bandwidth are also investigated and discussed. Measured results for the reflection coefficient, far-field radiation patterns, radiation efficiency, gain, and group delay of the designed antenna over the UWB spectrum are presented and discussed. Measured data show good concordance with the numerical results. Also, the fidelity factor is calculated in both E-and H-plane by using CST Microwave Studio. The obtained results in both time-and frequency-domain indicate that the antenna is a good option for UWB applications.

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Section: Introductionmentioning

confidence: 99%

A Compact Uwb Antenna Design Using Rounded Inverted L-Shaped Slots and Beveled Asymmetrical Patch

Dastranj¹,

Bahmanzadeh²

2018

PIER C

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show abstract

“…One technique is to use several geometries of slots [10][11][12][13][14][15][16][17][18], and the other methods use different turning stubs to achieve wideband performance [19,20]. Among several slot geometries worthwhile mentioning are square [10], triangle [11], rectangle [12], ellipse and circle [13], rhombus [14], fractal [15], annular-ring [16], and binomial-curve [17]. The impedance bandwidths of these antennas are less than 104%.…”

Section: Introductionmentioning

confidence: 99%

Investigation of a Low-Profile Planar Monolayer Uwb Antenna With an Open Slot for Bandwidth Enhancement

Dastranj¹,

Abbasi-Arand²

2015

PIER C

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Abstract-A low-profile planar monolayer antenna for ultra-wideband (UWB) operation is presented. To achieve a UWB performance along with a compact size, a hybrid square-circular radiator and a rectangular open slotted ground plane with two symmetrical I-shaped tuning stubs are proposed. The antenna is fed by a coplanar waveguide line and has a small size of 44 × 32 × 1.6 mm 3 . The prototype of the proposed antenna was fabricated and tested in an anechoic chamber. The simulated and measured results show good agreement over the entire ultra-wide bandwidth. The measured results indicate that the proposed antenna can provide a wide impedance bandwidth of more than 154% from 1.7 to 13.3 GHz with −10-dB reflection coefficient. In addition, it is demonstrated that by introducing several antenna designs, the impedance bandwidth can be improved from 43% to 154%. Besides several mechanical advantages, such as compact in size, easy fabrication, and monolayer configuration without any back ground plane, the proposed antenna also shows a good performance in its radiation characteristics and time-domain behaviors. The measured results in both frequency and time domains prove that the proposed antenna can be used in a wide range of UWB applications.

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“…For these applications, several promising dual or multiband planar antennas for the WLAN/WiMAX applications have already been proposed in [1][2][3][4][5][6][7][8][9][10][11][12]. In [1][2][3], by employing different shapes of monopole such as T-shaped monopole, double-T monopole or modified inverted-L monopole, the antennas can achieve dual-band operations and are simple in structure, but none of the above designs can achieve a dualband bandwidth so large to cover the whole WLAN/WiMAX bands.…”

Section: Introductionmentioning

confidence: 99%

“…Unfortunately, although the above designs achieve bandwidth enhancement, most of them have a relatively large overall size and occupy too much of the device space. In addition, several other types of compact antennas with multiband have been found in recent literatures, including a quadband antenna with three L-shaped slots and a rectangular slot [8], a koch fractal printed slot antenna [9], an elliptical slot antenna with "T"-and "L"-shaped slots and three quarter-wavelength stubs [10], a rectangular patch with dual U-shaped slot [11] and a dual rectangular ring with open-end [12]. But they are all complicated in configurations to reduce the antenna's application.…”

Section: Introductionmentioning

confidence: 99%

A Compact CPW-Fed Monopole Antenna With Triple Bands for Wlan/Wimax Applications

Dong¹,

Zhang²,

Li³

et al. 2013

PIER Letters

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Abstract-A novel compact coplanar waveguide (CPW)-fed printed antenna with triple bands for WLAN and WiMAX applications is presented. By using a parasitic circular patch, a pair of symmetrical inverted-L strips and a 50-Ω transformer, the antenna can effectively provide a good input impedance matching. The tuning effects of the ground size, the parasitic circular patch and the symmetrical inverted-L strips to the resonance and matching condition are then examined, and the prototype of the proposed antenna is further fabricated and measured. The experimental and numerical results exhibit that the antenna has impedance bandwidth with 10 dB return loss 2.32-2.80 GHz, 3.06-4.13 GHz and 5.03-6.04 GHz, which can cover both the WLAN 2.4/5.2/5.8 GHz bands and the WiMAX 2.5/3.5/5.5 GHz bands. Also, a stable monopole-like radiation pattern and an average antenna gain of 3.06 dBi across the operating bands have been obtained.

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CPW-Fed Koch Fractal Slot Antenna for WLAN/WiMAX Applications

Cited by 116 publications

References 12 publications

A Compact Uwb Antenna Design Using Rounded Inverted L-Shaped Slots and Beveled Asymmetrical Patch

A Compact Uwb Antenna Design Using Rounded Inverted L-Shaped Slots and Beveled Asymmetrical Patch

Investigation of a Low-Profile Planar Monolayer Uwb Antenna With an Open Slot for Bandwidth Enhancement

A Compact CPW-Fed Monopole Antenna With Triple Bands for Wlan/Wimax Applications

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