An ultra‐wideband planar fractal monopole antenna with dual‐notch characteristics is presented in this article. The microstrip fed antenna consists of nested trapezoidal rings and defected ground plane. Measured results show that the proposed antenna operates with a 10 dB return loss bandwidth from 2.2 to 10.8 GHz with notch bands at (2500‐2690) MHz and (3300‐4200) MHz covering LTE 2500, WiMAX and part of C‐band.
A UWB planar monopole antenna with dual‐band notch characteristics is presented in this paper. Measured results show that the proposed antenna operates with a 2.76 to 11 GHz 10 dB return loss bandwidth with notch bands covering 3.45 to 4.81 and 5.24 to 6.21 GHz. The notch bands are suitably placed to eliminate interferences from WiMAX band (IEEE802.16), C‐band, INSAT band, and WLAN bands (IEEE802.11a/h/j/n). The lower notch band has been achieved by using 4 circular patch‐loaded stubs on the radiating structure, whereas 2 complementary split ring resonators have been used on ground plane to achieve the upper notch band. Necessary formulae for the design of the antenna have been provided. Measured |S11|, radiation patterns, gain, and group delay of the proposed antenna are presented. The results show that the proposed antenna is suitable for short‐range, high‐speed data communication using short pulses.
A multiband planar symmetrical plus‐shaped fractal monopole antenna with stepped ground plane is presented in this study. Measured results show that the proposed antenna operates with 10 dB return loss bandwidths from 1.630 to 1.88 GHz and from 4.5 to 8.5 GHz covering The Global System for Mobile Communications (GSM) 1800 MHz 2G spectrum band, 4400 to 4900 MHz 5G spectrum band adopted by Japan and China for future 5G communication in sub‐6 GHz band, 5.15 to 5.925 GHz LTE band 46, WLAN IEEE 802.11 y/a/h/j/n/P bands, and 5.8 to 7.707 GHz military band. The antenna gain varies between 1.73 and 1.97 dB in lower band and 3.6 to 5.05 dBi in upper band with radiation efficiencies more than 90% in lower band and more than 80% in upper band. The antenna has more than 64 and 28 dB isolations between the copolar and cross‐polar radiation patterns in the lower and upper bands, respectively.
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