Mutual Coupling Reduction Using a Protruded Ground Branch Structure in a Compact UWB Owl-Shaped MIMO Antenna

Abstract

A compact ultra-wideband (UWB) multiple input-multiple output (MIMO) antenna with high isolation is designed for UWB applications. The proposed MIMO antenna consists of two identical monopole antenna elements. To enhance the impedance matching, three slots are formed on the ground plane. The arc structure as well as the semicircle with an open-end slot is employed on the radiating elements the fact which helps to extend the impedance bandwidth of the monopole antenna from 3.1 up to 10.6 GHz, which corresponds to the UWB band. A ground branch decoupling structure is introduced between the two elements to reduce the mutual coupling. Simulation and measurement results show a bandwidth range from 3.1 to 11.12 GHz with |S11_|<−15 dB, |S21_|<−20 dB, and ECC < 0.002.

A Review on Different Techniques of Mutual Coupling Reduction Between Elements of Any MIMO Antenna. Part 1: DGSs and Parasitic Structures

“…Along with a slit on the shared circular‐shaped radiator, an inverted Y‐shaped stub has been introduced in the ground plane at an angle of 45° (Srivastava & Kanuijia, 2015) to minimize the MC. Because of instrumental contributions of protruding ground stub structures in reducing MC particularly among wideband and UWB‐MIMO antenna elements many such designs have been introduced, among those some popular designs are folded Y‐shaped (Khan et al., 2015), diagonally integrated strip (Chacko et al., 2013; Gao et al., 2014), extended rectangular stub (Yoon et al., 2011), protruded I‐shaped stub at an angle of 45° (Zhu et al., 2016), an inverted pair of L‐shaped strips (Chandel et al., 2018; Khan et al., 2017a), an inverted L‐shaped strip (Kumar et al., 2019b), tree‐like stub (Zhang et al., 2009) as represented in Figure 14a, arrowhead‐shaped stub at an angle of 45° (Zhu et al., 2016), an inverted L‐shaped and I‐shaped stub (Liu et al., 2013) as represented in Figure 14b, funnel‐shaped stub (Gautam et al., 2018), circular arcs shaped stubs (Mathur & Dwari, 2018b), extended curved stub (Biswal & Das, 2019), partial ground T‐shaped stub (Malviya et al., 2016a), inverted L‐shaped stub integrated with T‐shaped slot (Singh et al., 2013), etching T‐shaped slot on the radiator and extended arrow‐shaped stub (Mao & Chu, 2014), pair of extended I‐shaped (Sharawi et al., 2011), a rectangular slot with one circular end embedded with two inverted‐L‐shaped branches (Shoaib et al., 2014), a cross‐shaped stub (Singh & Tripathi, 2019), F‐shaped stubs (Iqbal et al., 2017), a dual‐inverted‐L‐shaped ground branch with a slot (Zeng et al., 2012), two protruded ground parts (Li et al., 2013), a stepped stub at an angle of 45° (Biswal & Das, 2018a), two inverted L‐shaped and one I‐shaped stub (Hong et al., 2008), a pair of L‐stubs, spiral stubs, and L‐slots (Huang et al., 2015a), narrow metallic and slot stubs (Krishna & Kumar, 2016), grounded stub along with two F‐dual grounded circular ring resonator (Mathur & Dwari, 2019a) as represented in Figure 15a, two F‐shaped stub and rectangular slots (Wani & Vishwakarma, 2016) as described in Figure 15b, a simple I‐shaped stub (Mchbal et al., 2018), a rectangular vertical arm (Saxena et al., 2017), inverted L...…”

Isolation Improvement Using Asymmetric Radiators and Ground Plane Diversity Mechanism in a Six-Element Uwb Mimo Antenna Design

“…The adopted antenna is mounted on the top face of a low cost 26 * 15.5 * 0.8 mm 3 FR-4 substrate with a relative permittivity 4.3 and loss tangent 0.025. Note that the adopted antenna has evolved from an owl-shaped 2 * 2 MIMO antenna in [12], and it is simulated in the well-known 3-D electromagnetic simulator CST MWS. Table 1 illustrates the optimized dimensions of the proposed owl-shaped single antenna element.…”

Mutual Coupling Reduction Using Ground Stub and EBG in a Compact Wideband MIMO-Antenna

“…However, the efficiency and reliability of a UWB system is significantly affected by multi-path fading. To overcome this problem and enhance the UWB system performance, the MIMO technique has been introduced [2]. MIMO is a very efficient and reliable technique for modern wireless communication systems such as WLAN, 4G, and 5G communications.…”