A Dual-Polarized Square-Ring Slot Antenna for UWB, Imaging, and Radar Applications

A defected ground structure‐based rectangular monopole antenna along with 2 × 2 and 4 × 4 multiple‐input multiple‐output (MIMO) antennas are presented. The proposed monopole antenna consists of a defected ground structure with two slits and a notch placed at optimum positions to increase the impedance bandwidth. Besides, the radiator is loaded with a U‐shape stub to improve the impedance matching of the antenna. The measured impedance bandwidth of the proposed monopole antenna is from 3.18 to 11.5 GHz. Time domain experiment is carried on to investigate the dispersion characteristics of the proposed antenna. Measurement results reveal that the proposed antenna can retain the transmitted pulse shape, ensuring dispersion‐free communication. Far‐field measurements confirm omnidirectional radiation patterns over the operating bandwidth. Moreover, MIMO performance of the proposed 2 × 2 and 4 × 4 antenna arrays are evaluated based on isolation, envelop correlation coefficient, diversity gain, and channel capacity loss. The proposed single monopole and MIMO versions of this antenna can be used in portable UWB communication devices.

Section: Resultsmentioning

confidence: 90%

A DGS monopole antenna loaded with U‐shape stub for UWB MIMO applications

Hasan

Chu

Bashir

2019

“…Table gives the performance comparison for some dual‐polarization antennas. The presented slot antenna possesses the merits of UWB dual‐polarization characteristics and more compact dimensions when compared with other dual‐polarization antennas …”

Section: Simulated and Measured Resultsmentioning

confidence: 99%

A planar miniaturized UWB dual‐polarization multiple‐input‐multiple‐output slot antenna

Tan

Wei

et al. 2019

A planar miniaturized ultra‐wideband (UWB) dual‐polarization multiple‐input‐multiple‐output (MIMO) slot antenna is presented in this article. Two orthogonal microstrip lines are utilized to feed antenna, which can excite both orthogonal modes in two orthogonal‐stepped slots to realize dual‐polarization characteristics. Two orthogonal‐stepped slots are its main radiators. The overall size of the presented antenna is only 32 × 22 × 0.8 mm3. The antenna was built and measured. The measurement of common –10 dB impedance bandwidth reaches 7.56 GHz (110.7%, 3.05‐10.61 GHz). Port isolation is greater than 18 dB over the entire working band. The radiation patterns and gains are stable over the whole working band.

“…In this paper, a novel UWB‐MIMO antenna is proposed using semi‐circular annular slot antenna for UWB coverage. The overall antenna size of the proposed design with spatial diversity is 58 × 27

{m m}^{2}

that is smaller as compared to those with polarization diversity and Ref . So, both advantages of reliable information gathering and compactness come along with the proposed design.…”

Section: Introductionmentioning

confidence: 98%

“…Many UWB‐MIMO antennas have been reported in the literature with better impedance matching over entire UWB, band‐rejection capability and better isolation . In Ref .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An ultra‐wide band diversity antenna with band‐rejection capability for imaging applications

Latif

Tahir

Khan

et al. 2017

In this paper, a 2‐element UWB‐MIMO antenna system is proposed for imaging applications. Each antenna element consists of semi‐circular slot excited by 50 Ω microstrip transmission lines. Two small stubs are used on both sides of the microstrip lines for better impedance matching at higher frequencies. The band‐rejection at WLAN (5.15–5.825 GHz) band is achieved through a U‐shaped slot in the feeding transmission line. The antenna works efficiently from 3.1 to 10.6 GHz, covering the entire standard UWB. Slots in the ground plane are introduced to improve the isolation level between the antenna elements. A minimum isolation of 20 dB is attained in the entire operating band. The proposed antenna has a size of 58 × 27 mm2. Good agreement is obtained between simulated and measured results for reflection coefficient, isolation and consistent radiation patterns over the entire operating band that makes it promising candidate for medical imaging application in UWB.