Miniaturized four-port UWB MIMO antennas with triple-band rejection using single EBG structures

Abstract

This research paper introduces a ultra-wideband (UWB) multiple input multiple output (MIMO)/diversity antenna with three rejected bands using one compact electromagnetic band gap (EBG) structure. The suggested EBG structure rejects three bands at WiMAX, WLAN, and the X-band within the passband of the UWB antenna. To achieve compactness in the conventional EBG structure, two via and square slots are introduced. This structure contributes to better impedance matching by using tapered feedline and slots in the radiating patch. To improve the isolation among all four compact UWB monopoles, decoupling strips are extended from the ground plane. Furthermore, the |S21| is below 17 dB in between the antenna elements and the envelope correlation coefficient is below 0.5, which are tolerable values within the UWB range. Furthermore, different MIMO/diversity characteristics are also discussed. An FR-4 substrate with dimensions of 38 × 45 × 1.6 mm3 is used for the fabrication of the suggested structure.

Multi-band Notched Circular Polarized MIMO Antenna for Ultra-wideband Applications

“…In Figure 14, the isolation between the two patches is less than 15 dB for the whole frequency range. ECC, DG, and TARC have been used to calculate MIMO performance as specified in [7,19,20]. Using [19], a method can be used to find ECC in an isotropic environment using scattering parameters as given below.…”

“…The four structural components of the TVC-EBG are via, ground surface, dielectric, and copper patch surface. The design formulae in (1) and ( 2) are described in the sections underlined in [8,[17][18][19][20].…”

A monopole polarisation diversity antenna for high density packaging MIMO applications

“…Many techniques have been used in the literature for improving isolation. The techniques can be categorised into four broad approaches, namely, polarisation diversity (Taki and Abou-Rjeily, 2022; Adamiuk et al , 2009; Aboufoul et al , 2012; Osman et al , 2016; Peristerianos et al , 2016; Kaur et al , 2021; Sghaier and Latrach, 2021; Kim-Thi and Tran, 2021), quasi-self-complementary approach (Zhu et al , 2016; Khattak et al , 2021), pattern diversity (Tao and Feng, 2016; Divya et al , 2021; Dahl et al , 2017; Reddy et al , 2015; Sohi and Kaur, 2020) and usage of additional decoupling structures (Chacko et al , 2013; Xie et al , 2013; Chattha et al , 2013; Mao and Chu, 2014; MoradiKordalivand et al , 2014; Kang et al , 2015; Ramachandran et al , 2016; Chao-Ming et al , 2015; Bannered et al , 2017; Rajkumar et al , 2015; Deng et al , 2016; Li et al , 2013; Masoodi et al , 2020; Thakur et al , 2021; Abed et al , 2021; Singh et al , 2021; Kaboutari and Hosseini, 2021). We now provide a comprehensive review of some of these works.…”

“…Compact WLAN band-notched antenna uses the vertical stub and H-slot split ring resonator to reduce mutual coupling and achieves notch characteristics and improved isolation in Masoodi et al (2020). Miniaturized band-rejected antenna has modified EBG to provide three band notch characteristics and also a C-shaped slot is used to improve S 11 and S 21 performance (Thakur et al , 2021). In Abed et al (2021), multiple single element antennas are analysed for 5G applications and the paper carefully points the weakness of such designs and the necessity to adopt multiple antenna technology.…”