Design of compact UWB monopole patch antenna with octagonal shape for C-band, Wi-MAX, and WLAN applications

This study presents a new compact UWB monopole antenna designed for 4G and 5G wireless band communications. The antenna features a partial ground plane and an octagonal radiation patch, which enable two resonances at 2.6 and 5 GHz bands with a bandwidth of S11 < -10 dB ranging from 2 - 6 GHz (4000 MHz). The antenna covers the frequencies of 3.7-4.2 GHz (C-band), 3.2-3.8 GHz (WiMAX band), and 5.15-5.85 GHz (WLAN band), making it suitable for various applications including wireless medical applications. Fabricated on an FR4 substrate with a dielectric constant of epsilon r =4.4, loss tangent (tan delta)= 0.015, and thickness of 1.6 mm, the proposed antenna exhibits bi-directional and omnidirectional radiation patterns in the E and H-planes. Additionally, it offers advantages in terms of wireless baseband transmission at high data rates and in the near-field region. Compared to other UWB antennas in the literature, the presented antenna has very compact size of only 30 x 20 x 1.6 mm(3), making it easily integrable into various wireless medical terminals. The experimental results demonstrate the effectiveness and performance of the proposed antenna design.