A butterfly-like slot UWB antenna with WLAN band-notch characteristics for MIMO applications

Abstract

An ultra-wideband (UWB) antenna with butterfly-like coupling slot for 4-element multiple-input multiple-output (MIMO) applications is introduced in this letter. In the design of the UWB antenna unit, the proposed butterfly-like slot is adopted to improve the impedance matching and achieves the operating bandwidth of 3-12 GHz. At the same time, a symmetrical T-shaped meandering strip etched on the ground and connecting with the patch through via produces a notch at 5.1-5.37 GHz, which suppresses the signal interference in WLAN band simultaneously. The results show that the proposed antenna array consisting of four orthogonal elements realized good isolation of lower than −15 dB without any additional decoupled structures. Also, the proposed 2 × 2 MIMO design exhibited good diversity performance in terms of envelop correction coefficient (ECC<0.015), diversity gain (DG>9.92 dB). The gain reaches a maximum value of 6.8 dBi. Simulated and Measured results are in good accordance. All of this reveals the effectiveness of the proposed antenna in MIMO system and it can be suggested as a suitable candidate for UWB applications.

Design and performance evaluation of SWB MIMO antenna with tri-notch functionality and mutual coupling suppression

“…Likewise, a high radiation efficiency of ≥ 80% is observed for the passband while for the notch band the radiation efficiency decreases up to 20%, as depicted in Fig. 8 the proposed antenna, calculated using the far-field parameter by using the equations provided in [30]. The antenna offers a low ECC , 0.015 in the operational band along with a high diversity gain of ≥ 9.96 dB.…”

“…The antenna has an overall size of 40 mm ×68 mm and simple geometry. In [27,28,30], wideband MIMO antennas have been designed. The setback of these antennas is the large value of mutual coupling between MIMO elements.…”

Dual-Band UWB Monopole Antenna for IoT Applications

“…UWB with band rejection capabilities has been developed to reduce interference in wireless applications. To achieve these band rejection capabilities, several slits can be made in feed, ground, or patch [6]. Using a slot to boost bandwidth, a reduced antenna size was proposed in [7].…”