DESIGN ANALYSIS AND MODELING OF DIRECTIONAL UWB ANTENNA WITH ELLIPTICAL SLOTTED GROUND STRUCTURE FOR APPLICATIONS IN C- & X-BANDS

Abstract

Abstract-A modified technique to design directional ultra-wideband (UWB) antenna with slotted ground structure approach on the ground plane has been presented for applications in C-and X-bands. Initially, elliptical slot is inserted into ground and thereafter, the axis of ellipse is rotated 45 degrees in direction of the substrate. Minor axis of the ellipse is optimized to locate it symmetrically around the circular patch in order to obtain the full C-and X-band operations and also to enhance directivity. Thereafter, for further improvement in the directivity as well as gain, an elliptical slot in circular patch has also been introduced. The impedance bandwidth approximates about 95% covering the frequency ranging from 4.18-11.50 GHz. The return losses (S 11 ) are −38 dB and −43 dB through simulation, which are −24 dB and −32 dB by measurement at 6.3 GHz, 9.3 GHz resonant frequencies, respectively. Simulated gain and half power beam width (HPBW) are 2.5-8.4 dB and 49-22 degrees in 4.18-11.50 GHz band, respectively. Gain and half power beam width (HPBW) of the proposed antenna improves by 1-2 dB and 5-10 degrees, respectively compared with previously designed antennas. Simulation of the antenna has been carried out on Computer Simulation Technology (CST) software on an FR-4 substrate having dielectric constant 4.3 of thickness 1.6 mm. The measured results show good agreement with equivalent circuit model and CST simulation.

Ultra Wide Band CPW Fed Patch Antenna With Fractal Elements and DGS for Wireless Applications

“…In Figure 12(b), the circuit is shown in simplified form. The impedance model approach [24][25][26] is followed to develop the equivalent circuit. The input port is excited with a 50 Ohm RF source.…”

“…Another well-known and very much useful technique for wide impedance bandwidth or multifrequency response is usage of a defective ground structure (DGS) [17,18,[20][21][22][23][24][25][26]. When a defect in the ground plane is made, the current distribution at that plane gets disturbed.…”

“…Many authors have discussed different approaches to develop equivalent circuit of microstrip patch antenna [24,25]. Nashaat et al described an equivalent circuit of a patch antenna with rectangular DGS where the slot was presented through a simple L-C resonator [26].…”

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“…The proposed antenna exhibited the good gain of 5.5dBi across the frequency span [22]. Further, the authors have presented the antennas which were capable to cover the different wireless communication applications [23].…”

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“…There is an ascendant marketplace percentage for polyester/cotton (P/C) blends in the textile industry of 58.45% share in worldwide marketplace as a result of their cost of aesthetic and affable achievement of the consumer [2]. Nonetheless, when disperse dyes under dyeing conditions' conventional high-temperature polyester, such as 130 o C and pH 4-5, are used in the dyeing of blends, the result is a poor wet fastness such as washing and perspiration.…”