Design of a miniaturized UWB MIMO Vivaldi antenna with dual band-rejected performance

A wideband dual-line polarized antenna with low-profile property is presented in this paper. The dual-polarized antenna consists of two crossed antenna elements over a metal reflector and is excited by RF connectors vertically. Here, the crossed antenna element is based on Vivaldi radiator to obtain wideband performance. By loading resistors on the patches of Vivaldi radiator, not only the impedance matching of the proposed antenna can be improved further but also the profile is reduced greatly. Whatever, the loaded resistors can also depress radiation efficiency of the antenna element to a certain extent, especially in the lower band. For this reason, three periodic slots etched on the Vivaldi radiator are introduced herein to enhance the gain performance. To verify the feasibility of the proposed design, a prototype has been fabricated and measured. The results show good performance of a relative bandwidth of 153% for VSWR ≤ 2 (2-15 GHz) and a low profile of 0.22 λL (in terms of the lowest frequency of the band). Besides, the prototype can achieve an average gain of approximately 5 dBi and a maximum radiation efficiency of 80% within passband.

Section: Introductionmentioning

confidence: 99%

A wideband dual-polarized crossed antenna with low profile and enhanced gain performance

Zhang,

Wu,

Wang

et al. 2024

“…The changes are introduced in the communication system to meet the aforementioned requirements. These manipulations are mainly performed to get high data rate, high throughput, compact, simple, lightweight, low cost, and highly efficient system [3]. Being a key component, these changes directly impact antenna design.…”

Section: Introductionmentioning

confidence: 99%

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

Ullah

Cao

Rahman

et al. 2023

This research focuses on the design of a super wideband (SWB) antenna and its two-port multiple input multiple output (MIMO) configurations. The antenna is designed to cover the wideband spectrum ranging from 1.42 GHz to 40 GHz, with the additional feature of tri-notch band functionality. The respective band spectrums of 3.5 GHz, 5.8 GHz, and 10.5 GHz, which are worldwide assigned for 5th generation (5G), sub-6-GHz applications, Wireless local area network (WLAN), Industrial Science and Medical (ISM) applications and X-band are notched utilizing different shapes of slots. The SWB is achieved by converting a broadband circular monopole into an asymmetric semicircular monopole offering wideband, which is then modified by implementing the tapered line feed techniques. Furthermore, to reduce the mutual coupling among the MIMO elements, a T-shaped open-ended stub is loaded between them and optimized to achieve a low mutual coupling of ≤-20 dB. Along with that, various MIMO performance parameters are studied and their comparison with the measured results is compared. Lastly, a comparison table is produced to indicate the competence of the suggested work in comparison to the state-of-the-art, which strengthens the provided conclusions.

“…Existing decoupling methods are abundant [6]. For instance, in [7,8,9], the MIMO element isolation degree is improved by etching gaps of different shapes on the floor. In [10,11], neutralization line structure is added between antenna elements to reduce mutual coupling.…”

Section: Introductionmentioning

confidence: 99%

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

Wang

Chen

et al. 2022

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.