International Journal of Engineering, Management & Sciences (IJEMS) ISSN-2348 –3733, Volume-1, Issue-9, September 2014
Effective UWB Antenna Using H Slot Cut in Ground Plane to Enhance Performance with WLAN Rejection Sachin Singhal, Gajendra Sujediya Abstract— In this paper, a bandwidth enhancing technique is presented using a modified ground plane with H slot cut in ground plane for designing of compact antenna a new type of band-notched novel shaped slot antenna is proposed for UWB applications. By cutting novel H shaped slot on the ground plane, desired notched frequency band is achieved. By properly adjusting the parameters of proposed antenna is analyzed by the Ansoft -HFSS software, which is possible to find desired band width and centre frequency of notched band. The proposed antenna is designed on a substrate Rogers RT/duroid 5880 with thickness of 0.762 mm (30mils) and relative permittivity (∈_r) of 2.2, and loss tangent 0.0004 to operate in UWB frequency band. To reject the frequency band of 5.17– 5.69 GHz, which is limited by IEEE 802.11a, a novel shaped H slot. The size of our proposed antenna is 30×30 mm2, which results in desirable radiation characteristics. Effects of varying the parameters of novel shaped H slot on performance of proposed antenna have been studied. The antenna with optimal parameters obtained from parametric study is fabricated and measured. It is observed that the simulation and experimental results have good agreements with each other. The proposed Antenna achieved given parameter like Bandwidth (2.8-13.1GHz), Frequency Spectrum (10.3GHz), Fraction Bandwidth (129.55%), Positive Gain, Low Cost, Good Impedance matching, with omni-directional Radiation Pattern which is extremely good. Index Terms— Ultra Wide-Band (UWB), Band-Notched Antenna, H Slot, Microstrip Antenna.
interference between UWB system and WLAN system, various UWB antennas with a notch function have been developed for UWB communication systems. II. PARAMETRIC ANALYSIS OF PROPOSED DESIGN WITH SPECIFIED PARAMETERS The new small size slot type UWB antenna[1,10] which is developed in this dissertation which is able to be operating at frequency between 2.8 to13.1GHz, with notch band 5.17 to 5.69 GHz. All the bandwidth enhancement techniques applied to antenna are investigated and analyzed. Thus, the methods to increases the bandwidth is first essential step. At the first stage of work, concentration will be on rectangular UWB antenna where some of calculations are done initially. The antenna is fed with 50Ω Micro-strip line and is printed on the Rogers RT/duroid 5880 substrate (Lsub× Wsub) with the height (h) of 0.762 mm and relative permittivity εr = 2.2 (dielectric constant) with loss tangent tan δ = 0.0004 L & W denote the length & width of the dielectric substrate, respectively.
I. INTRODUCTION The ultra wide-band (UWB) impulse radio technology is one of the promising wireless technology that has capability of high data rate transmission. there has been considerable research effort put into UWB radio technology worldwide. Recently, the Federal Communication Commission (FCC)’s allocation for unlicensed operation in the frequency band 3.1–10.6 GHz for commercial use has sparked attention on ultra wide-band (UWB) antenna technology in the industry and academia. Several antenna configurations have been studied for UWB applications. However, the frequency band of UWB communication systems includes the IEEE802.11a frequency band (5.15–5.825 GHz). Therefore, UWB communication systems may generate interference with IEEE802.11a WLAN System. To overcome electromagnetic Manuscript received September 09, 2014 Sachin Singhal, M.Tech Scholar, Department of Communication., RIET Jaipur Gajendra Sujediya, Asst. Prof., Department of Communication., RIET Jaipur
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Figure 1 FABRICATED ANTEENA GEOMETRY (a) front view (b) back view
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Effective UWB Antenna Using H Slot Cut in Ground Plane to Enhance Performance with WLAN Rejection
III RESULTS& DISCUSSION
The comparison of simulated and measured VSWR is shown in figure 3; these results are almost same in frequency 2.5 to 10.7GHz with notch characteristics. Therefore, these frequency ranges are also used to design a better antenna as per requirement.
Figure 2 Simulated Result of VSWR
Figure 5 COMPARSION OF MEASURED& SIMULATED RETURN LOSS The figure 5 shows that the comparison of simulated and measured returns loss. It is obtained that the value of both is almost same between the frequency range 6 to 10 GHz hence the bandwidth is suitable for designing a better antenna as it require a small value of return loss for best performance. IV. CONCLUSION A novel band-notched ultra wide-band antenna using H slot cut in ground plane with WLAN rejection is proposed in this paper. In order to obtain WLAN band rejection, h slot is cut in ground plane. Band-notched characteristics can be controlled by adjusting h slot parameters. Parametric studies of antenna are presented. The proposed antenna design with optimal dimensions is simulated and fabricated. The results show that VSWR is below 2 within the desired frequency bandwidth from 2.8 GHz to upper 11 GHz, whereas a notched bandwidth of 5.17-5.69 GHz is obtained. . Good agreement has been found by comparing the results from the measured data and those simulated.
Figure 3 Simulated Result of RETURN LOSS
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Figure 4 COMPARISON OF MEASURED& SIMULATED VSWR
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International Journal of Engineering, Management & Sciences (IJEMS) ISSN-2348 –3733, Volume-1, Issue-9, September 2014
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