Bandwidth, Gain Improvement, and Notched-Band Frequency of SWB Wave Coplanar Vivaldi Antenna Using CSRR

Abstract

Antennas with high gain that can operate in Super Wide Band (SWB) frequencies can be employed for a variety of wireless applications that serve different telecommunications infrastructure and radar applications. However, wide-bandwidth antennas suffer from interference from other wireless technology networks, necessitating the deployment of strategies to block some undesired signal frequencies. A new method for increasing bandwidth by shortening the taper slot length of the Vivaldi antenna and increasing the antenna radiation pattern by using a wavy structure and adding a Square-Complimentary Split Ring Resonator (S-CSRR) structure that can notched-band several frequencies has been investigated on the Coplanar Vivaldi Antenna (CVA). In this study, we investigated seven different types of antennas: Conventional CVA (C-CVA), CVA-Short Slot and Long-Slot (CVA-SS and CVA-LS) with antenna lengths of 10 and 15 cm, wave CVA (WCVA), and WCVA with CSRR. In all frequency bands ranging from 2.3 to more than 30 GHz, the S 11 of the CVA-SS antenna is less than -15 dB with minimum S 11 of-62.21 dB. When compared to the CVA-LS without a corrugated construction, the WCVA-SS antenna has 5.77 dBi improvement of directivity at 15 GHz. By incorporating the S-CSRR structure into WCVA, four notched frequency bands are formed: 3.335 -3.72 GHz (WiMAX spectrum), 4.72 -5.354 GHz (WLAN), 6.07 -6.743 GHz (Wifi 6E usage), and 7.408 -8.293 GHz (X-satellite bands). S-CSRR also potentially result in circular polarization at 4.6 -5.3 GHz with the minimum AR of 0.438 (at 5 GHz), at 7.8 -8.2 GHz with the minimum AR of 0.732 (at 8GHz) and at 27 GHz with AR of 2.1 by constructing a U shape with four SCRRs. There was also good agreement between simulation and measurement results. As a result, the WCVA-SS antenna with a Square-CSRR structure may be recommended for the usage of SWB antennas, where a single antenna can serve numerous telecommunications and radar system applications.INDEX TERMS Bandwidth, Gain, Notch-band, Super Wide Band, and Vivaldi Antenna. I. INTRODUCTION U Ltrawideband antennas have become popular for research and use in the wireless industry ever since the FCC allowed it to market communications in the 3.1-10.6 GHz frequency [1] [2] [3]. Ultrawideband antennas offer the benefit of enabling short-range wireless communications with high capacity while employing low-cost and low-energy transceivers. It should be noted that UWB short pulse signals can boost transmission speed, resist multipath fading and frequency selective fading, and provide excellent security and