Sprocket gear wheel shaped printed monopole ultra-wideband antenna with band notch characteristics: Design and measurement

A compact ultra-wideband (UWB) printed monopole UWB with dual band-notched characteristics has been designed and investigated in this manuscript. The Wi-MAX and wireless local area network (WLAN) band rejection characteristics have been obtained by employing the circular ring and arc-shaped slot along with rectangular slot in radiating patch. Overall size of proposed UWB antenna is 27 x 27 x 1.6 mm(3), which consists of sprocket gear wheel shaped structure as a core radiating patch element and excited by using 50 omega coplanar waveguide feed. The proposed antenna exhibits the UWB frequency spectrum from 3.1 to 10.6 GHz along with Bluetooth frequency range 2.4-2.48 GHz without disturbing overall dimensions of antenna. Proposed antenna reveals the measured VSWR operating bandwidth of 10.0 GHz in the frequency range from 2.0 to 12.0 GHz along with Wi-MAX and WLAN rejected bands. Moreover, proposed antenna adorns the measured gain of -8.28 and - 9.98 dBi at rejected frequency bands, whereas, at other frequencies, it changes between 1.5 and 5.0 dBi. The radiation efficiency of proposed UWB antenna varies from 84% to 97% except rejected frequency bands. Group delay and radiation pattern have also been analyzed and found appropriate for the current UWB applications. Finally, the optimized structure of antenna with dual band rejection characteristics has been fabricated and tested for the authentication of simulated results. Both the results are compared and are found in good agreement with each other.