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

Nurhayati Nurhayati, Fitri Yuli Zulkifli, Eko Setijadi, Bagus Edy Sukoco, Mohd Najib Mohd Yasin, Alexandre Manicoba De Oliveira

Research output: Contribution to journalArticlepeer-review


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 S11 of the CVA-SS antenna is less than -15 dB with minimum S11 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.

Original languageEnglish
Pages (from-to)16926-16938
Number of pages13
JournalIEEE Access
Publication statusPublished - 2024


  • Bandwidth
  • gain
  • notch-band
  • super wide band
  • Vivaldi antenna


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