A Comb Shape Slot UWB Antenna with Controllable Triple Band Rejection Features for Wimax/Wlan/5G/Satellite Applications Md Mohiuddin Soliman Electronic and Telecommunication Engineering International Islamic University Chittagong Bangladesh mohiuddinmohin86@gmail.com Ifran Ahmed Rafi Computer Science and Engineering Qatar University Doha, Qatar ifranrafi99@gmail.com Mahdi Alkaeed Computer Science and Engineering Qatar University Doha, Qatar ma1805365@qu.edu.qa M. M. Hasan Mahfuz Electrical and Computer Engineering International Islamic University Malaysia Selangor, Malaysia mahfuz216@gmail.com Md. Jahedul Alam Pervez Electrical and Electronic Engineering Ahsanullah University of Science and Technology Dhaka, Bangladesh bdpervez12@gmail.com Ahmed Musa Electronic and Telecommunication Engineering International Islamic University Chittagong, Bangladesh ahmad0musa1@gmail.com Abstract— Advent of Ultra-wideband (UWB) technology has been flourished the uses of UWB spectrum (3.1-10.6) GHz accredited by the Federal Communication Commission (FCC) for the diversity of short-range applications. The vital challenge is to design a proficient UWB antenna, which will alleviate the Electro-magnetic interference of the UWB spectrum with the coexisting narrowband utilizing band notch appearances. In this research work, a comb slot shape competent UWB antenna proposed with controllable triple- band rejection characteristic for Wimax/WLan/5G/Satellite applications. The antenna has primarily obtained UWB characteristics by defecting the ground structure in a staircase form and triple-band notch features achieved by inserting a comb shape slot on a radiating patch. The comb shape consists of three slots and the deviation of slot length in an exponential order. Moreover, the band notch at 3-3.85 GHz for WiMAX attained by etching topper slot and band notch at 4.5-5.8 GHz, 7-8 GHz achieved via the inclusion of middle slot and bottom slot respectively. Above and beyond, each band notch can be controlled over a range of frequency by customizing the slot dimension. The proposed antenna occupied compact size 35x35x1.6 mm3 and almost 95% average radiation efficiency obtained over the bandpass frequency, while the lowest 20% efficiency attained over the band notch. Furthermore, the proposed antenna has achieved return loss -58 dB as the minimum value and close to -2 dB as maximum value over the UWB as well as band notch frequency respectively. In conclusion, it is noteworthy that the proposed antenna covered the existing research challenge and will perfect antenna tools for upcoming UWB technology. Keywords— UWB, Band-notch feature, 5G lower band, EMI I. INTRODUCTION In wireless communication applications, UWB technology have grown plentiful attention in both academic society and industrial zones due to its larger data rate, ease of fabrication, low spectral power density, high exactness ranging capability. Consistent with the Federal communication commission (FCC) declaration in 2002, UWB spectrum is considered a frequency spectrum ranging from 3.1 to 10.6 GHz and fairly large bandwidth of 7.5 GHz managed [1]. On account of the superior unlicensed spectrum as a bandwidth, UWB technology compromises higher data rates in short-range communication such as IOT, RFID technology, biomedical applications and Wireless Body Area Networks (WBANs) [2-7]. Although the UWB technology occupied huge applications in wireless communication, the major shortcoming which is electro-magnetic interfering with the established narrowband over the UWB spectrum such as IEEE 802.16 WiMAX at 3.5GHz (3.3–3.7GHz), IEEE 802.11a WLAN at 5.2/5.8GHz (5.15–5.82GHz), and X band satellite downlink frequency band at 7.5 GHz (7.1-7.9) GHz [8-10]. Additionally, ongoing 5G technology is considered spectrum for fixed satellite service at C band (3.3-4.2) GHz, for 5G cellular communication at (3.3-3.8) GHz and lower frequency band for 5G application at 4.5 –5.5 GHz [11-12]. The EMI with the existing narrowband over UWB can be resolved by numerous antenna designs such as etching extra resonator, putting parasitic patch and adding PIN diode with radiating element [13-15]. Nevertheless, indicated antenna design procedures can be rejected by the narrow band, which may upsurge the dimension and complication of the antenna geometry. To compensate the size of the antenna, inserting different slots on the radiating patch can be a marvelous way out. Even if the cutting slot on the radiating patch can get hold of band rejection at desired narrowband to exist over the UWB, there are still research problems that are facing such as inefficient radiation efficiency, larger space, reckless notch operation and complex antenna geometry. Research gaps will be clear in a brief literature review, which is given below. In the research paper [16], a single ring SRR loading UWB antenna with triple notch characteristics is presented. Although the planned antenna notch covered band rejection at Wimax/Wlan/X band satellite applications, the antenna consumed larger 50x60x1.6mm3, which did not gratify the compact size policy. Furthermore, it is noteworthy that the proposed antenna obtained a very less efficient return loss value and VSWR value over the band notch and UWB. In conclusion, as stated by the measured result, the antenna return loss value did not perfectly match with the simulation result. In a research article [17], a Triple Band Notched UWB Antenna Design Using Electromagnetic Band Gap (EBG) Structures is recommended. Circular shape radiating patch etched on the FR-4 substrate and triple-band notch 978-1-7281-9317-5/20/$31.00 ©2020 IEEE 2020 IEEE Student Conference on Research and Development (SCOReD) 27-28 September 2020, Johor, Malaysia 362 Authorized licensed use limited to: International Islamic University Malaysia. Downloaded on November 20,2020 at 10:51:54 UTC from IEEE Xplore. Restrictions apply.