scholarly journals Design of Compact Dual-Polarized Antennas for MIMO Handsets

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Wenhua Chen ◽  
Xin Wang ◽  
Zhenghe Feng
Keyword(s):  
Design Method ◽  
Coplanar Waveguide ◽  
Slot Antenna ◽  
Operation Mechanism ◽  
Relative Bandwidth ◽  
Multiple Input ◽  
Feeding Structure ◽  
Printed Monopole ◽  
Dual Polarized ◽  
Better Than

A design method of compact dual-polarized antennas has been proposed for multiple input and multiple output (MIMO) handset application. For the sake of high isolation in dual polarizations, a printed monopole and a hybrid slot antenna are combined using a coplanar waveguide (CPW) and microstrip hybrid feeding structure. The proposed topology will result in orthogonal current distribution modes for the different polarizations, which effectively reduces the mutual coupling of the two modes. The operation mechanism of the feeding structure is analyzed in principle and verified by simulation. Simulated and measured results show this compact dual-polarized antenna achieves isolation between the two ports of better than 25 dB, and the relative bandwidth is wider than 23.5%.

scholarly journals A Wideband Dual-Polarized Antenna Using Planar Quasi-Open-Sleeve Dipoles for Base Station Applications

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Guan-xi Zhang ◽  
Li Sun ◽  
Bao-hua Sun
Keyword(s):  
Return Loss ◽  
Ground Plane ◽  
Base Station ◽  
Cross Polarization ◽  
High Frequencies ◽  
Feeding Structure ◽  
Polarization Characteristics ◽  
Dual Polarized ◽  
Dual Polarized Antenna ◽  
Better Than

A wideband dual-polarized antenna for WLAN, WiMAX, and LTE base station applications is presented in this paper. The proposed antenna consists of two pairs of orthogonal planar quasi-open-sleeve dipoles along the centerlines, a balanced feeding structure and a square ground plane. The planar quasi-open-sleeve dipole comprises a pair of bowtie-shaped planar dipoles with two parallel curve parasitic elements. The introduced parallel curve parasitic elements change the path of the current of the original bowtie-shaped planar dipoles at high frequencies and hence wideband characteristic is achieved. Two pairs of the planar quasi-open-sleeve dipoles placed orthogonally further broaden the bandwidth of the antenna with dual-polarization characteristics. The proposed antenna achieves a 10-dB return loss bandwidth from 2.32 to 4.03 GHz (53.9% bandwidth) using the planar quasi-open-sleeve dipole structures. The isolation between the two ports remains more than 32 dB in the whole bandwidth. Measured results show that the proposed antenna keeps the cross-polarization under −33 dB and the front-to-back ratio better than 15 dB in the operating band. The antenna has an area of 0.3λ  × 0.3λat 2.32 GHz making it easy to be extended to an array element.

Compact 4-Port UWB-MIMO Slot Antenna with Dual Polarization and Low Correlation for Spatial Diversity Application

Frequenz ◽  
2018 ◽  
Vol 72 (11-12) ◽  
pp. 503-509
Author(s):  
Rohit Mathur ◽  
Santanu Dwari
Keyword(s):  
Multiple Input Multiple Output ◽  
Wide Band ◽  
Spatial Diversity ◽  
Slot Antenna ◽  
Dual Polarization ◽  
Low Correlation ◽  
Compact Size ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Better Than

Abstract A compact 4-port ultra-wide band (UWB) multiple-input-multiple-output (MIMO) slot antenna with dual polarization is presented. The key features of antenna are: has directive radiation in two planes and low correlation without use of additional decoupling structure. The antenna contains four microstrip feedlines having circular patches backed by stepped circular slots. Orthogonal arrangement of each slot antenna increases compactness with polarization diversity and good isolation. The antenna has compact size of 36×36×0.8 mm3. It operates in the frequency band of 3.1 to 11.9 GHz and isolation is better than 15 dB. The superior diversity performance is ensured by calculating envelope correlation coefficient (ECC) and diversity gain. In addition to guarantee distortion less transmission in UWB group delay is also measured.

scholarly journals Dual-Polarized Dual-Loop Double-Slot Antipodal Tapered Slot Antenna for Ultra-Wideband Radar Applications

Electronics ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 1377
Author(s):  
Guangyao Yang ◽  
Shengbo Ye ◽  
Feng Zhang ◽  
Yicai Ji ◽  
Xiaojuan Zhang ◽  
...  
Keyword(s):  
Low Frequency ◽  
High Gain ◽  
Ultra Wideband ◽  
Slot Antenna ◽  
Impedance Bandwidth ◽  
Loop Structure ◽  
Cross Polarization ◽  
Dual Polarized ◽  
Wideband Radar ◽  
Better Than

The miniaturized high-gain antenna is required in portable, ultra-wideband radar systems. However, the miniaturization, ultra-wideband and high gain often restrict each other in the antenna design. In this paper, a dual-polarized, double-slot, antipodal tapered slot antenna with a double-layer, dual-loop structure and novel slot edges is presented. The proposed magnetic dual-loop structure has the capacity to reduce the low cut-off frequency of the double-slot tapered slot antenna by weakening the resonance and coupling. In addition, the high gain, low sidelobe level (SLL), and low cross-polarization level are achieved in the boresight direction. A novel gradient slot profile is designed to improve the low-frequency directivity of the tapered slot antenna without affecting the matching. To feed the antenna elements, a kind of wideband, balun-divider structure is designed. The dual-polarized antenna is combined by two orthogonal elements in a cross configuration without galvanic contact or influence to performance. The measured results show that the impedance bandwidth of the proposed antenna is 0.6~4 GHz, and the maximum gain is 11 dBi. The isolation between the two antenna ports is better than 32 dB, and the cross-polarization discrimination (XPD) is better than 20 dB.

scholarly journals Design and Optimization of LTE 1800 MIMO Antenna

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Huey Shin Wong ◽  
Mohammad Tariqul Islam ◽  
Salehin Kibria
Keyword(s):  
Microstrip Antenna ◽  
Coplanar Waveguide ◽  
High Gain ◽  
Monopole Antenna ◽  
The Other ◽  
Mimo Antenna ◽  
Design And Optimization ◽  
Multiple Input ◽  
Wireless Application ◽  
Better Than

A multiple input and multiple output (MIMO) antenna that comprises a printed microstrip antenna and a printed double-L sleeve monopole antenna for LTE 1800 wireless application is presented. The printed double-L sleeve monopole antenna is fed by a 50 ohm coplanar waveguide (CPW). A novel T-shaped microstrip feedline printed on the other side of the PCB is used to excite the waveguide’s outer shell. Isolation characteristics better than −15 dB can be obtained for the proposed MIMO antenna. The proposed antenna can operate in LTE 1800 (1710 MHz–1880 MHz). This antenna exhibits omnidirectional characteristics. The efficiency of the antenna is greater than 70% and has high gain of 2.18 dBi.

scholarly journals A New CPW-Fed Diversity Antenna for MIMO 5G Smartphones

Electronics ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 261 ◽  
Author(s):  
Naser Ojaroudi Parchin ◽  
Haleh Jahanbakhsh Basherlou ◽  
Yasir I. A. Al-Yasir ◽  
Ahmed M. Abdulkhaleq ◽  
Mohammad Patwary ◽  
...  
Keyword(s):  
Coplanar Waveguide ◽  
Multiple Input Multiple Output ◽  
Antenna Design ◽  
Compact Size ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Good Potential ◽  
And Performance ◽  
Diversity Antenna ◽  
Better Than

In this study, a new coplanar waveguide (CPW)-fed diversity antenna design is introduced for multiple-input–multiple-output (MIMO) smartphone applications. The diversity antenna is composed of a double-fed CPW-fed antenna with a pair of modified T-ring radiators. The antenna is designed to cover the frequency spectrum of commercial sub-6 GHz 5G communication (3.4–3.8 and 3.8–4.2 GHz). It also provides high isolation, better than −16 dB, without an additional decoupling structure. It offers good potential to be deployed in future smartphones. Therefore, the characteristics and performance of an 8-port 5G smartphone antenna were investigated using four pairs of the proposed diversity antennas. Due to the compact size and also the placement of the elements, the presented CPW-fed smartphone antenna array design occupies a very small part of the smartphone board. Its operation band spans from 3.4 to 4.4 GHz. The simulated results agree well with measured results, and the performance of the smartphone antenna design in the presence of a user is given in this paper as well. The proposed MIMO design provides not only sufficient radiation coverage supporting different sides of the mainboard but also polarization diversity.

scholarly journals A Compact High-Gain Coplanar Waveguide-Fed Antenna for Military RADAR Applications

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Zaheer Ahmed Dayo ◽  
Qunsheng Cao ◽  
Yi Wang ◽  
Sandeep Pirbhulal ◽  
Ali Hassan Sodhro
Keyword(s):  
High Performance ◽  
Coplanar Waveguide ◽  
High Gain ◽  
Geometrical Complexity ◽  
Proposed Model ◽  
Relative Bandwidth ◽  
Field Radiation ◽  
Radar Applications ◽  
Better Than ◽  
Good Agreement

This paper presents a new design of a compact, high-gain coplanar waveguide-fed antenna and proposes a multielement approach to attain enhanced characteristics. The proposed method overcomes the simulation and geometrical complexity and achieves optimal performance features. The antenna prototype is carefully designed, and simulation results have been analyzed. The proposed antenna was fabricated on a new WangLing TP-2 laminate with dimensions (0.195λ × 0.163λ × 0.0052λ) at the lowest resonance of 9.78 GHz. The results have been tested and experimentally verified. The antenna model achieved excellent performance including a peak realized gain better than 9.0 dBi, optimal radiation efficiency better than 87.6% over the operating band, and a good relative bandwidth of 11.48% at 10 dB return loss. Symmetrical stable far-field radiation pattern in orthogonal planes and strong distribution of current are observed. Moreover, a comparative analysis with state-of-the-artwork is presented. The measured and simulation result shows a good agreement. The high-performance antenna results reveal that the proposed model is a good contender of military airborne, land, and naval radar applications.

scholarly journals Wideband, Low-Profile, Dual-Polarized Slot Antenna with an AMC Surface for Wireless Communications

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Wei Hu ◽  
Rui-Na Lian ◽  
Zhao-Yang Tang ◽  
Ying-Zeng Yin
Keyword(s):  
Wireless Communications ◽  
Return Loss ◽  
Slot Antenna ◽  
Impedance Bandwidth ◽  
Cross Polarization ◽  
Magnetic Conductor ◽  
Low Profile ◽  
Unit Cells ◽  
Dual Polarized ◽  
Better Than

A wideband dual-polarized slot antenna loaded with artificial magnetic conductor (AMC) is proposed for WLAN/WIMAX and LTE applications. The slot antenna mainly consists of two pairs of arrow-shaped slots along the diagonals of the square patch. Stepped microstrip feedlines are placed orthogonally to excite the horizontal and vertical polarizations of the antenna. To realize unidirectional radiation and low profile, an AMC surface composed of 7 × 7 unit cells is designed underneath a distance of 0.09λ0 (λ0 being the wavelength in free space at 2.25 GHz) from the slot antenna. Both the dual-polarized slot antenna and the AMC surface are fabricated and measured. Experimental results demonstrate that the proposed antenna achieves for both polarizations a wide impedance bandwidth (return loss 10 dB) of 36.7%, operating from 1.96 to 2.84 GHz. The isolation between the two input ports keeps higher than 29 dB whereas the cross-polarization levels basically maintain lower than −30 dB across the entire frequency band. High front-to-back ratios better than 22 dB and a stable gain higher than 8 dBi are obtained over the whole band.

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