scholarly journals A base station antenna element with simple structure but excellent performance

2018 ◽  
Author(s):  
Haihan Sun ◽  
Can Ding ◽  
Trevor S. Bird ◽  
Y. Jay Guo
Keyword(s):  
Simple Structure ◽  
Base Station ◽  
Antenna Element ◽  
Excellent Performance

LTCC slot array antenna for 5G application

2019 ◽  
Vol 2019 (1) ◽  
pp. 000238-000242
Author(s):  
Hiroyuki Takahashi ◽  
Satoshi Hirano ◽  
Daisuke Yamashita
Keyword(s):  
Mobile Device ◽  
Beam Steering ◽  
Base Station ◽  
Small Cell ◽  
Array Antenna ◽  
Antenna Element ◽  
Beam Angle ◽  
Antenna Size ◽  
Antenna Module ◽  
Cell Base

Abstract We develop the antenna module substrate which is broadband and large gain using an LTCC technology in a 28GHz band in this study. We used LTCC materials (dielectric constant 5.8, Dielectric loss 0.002@28GHz) which we developed for materials originally. First of all, we confirmed ability of slot array antenna made by LTCC for 5G application to get broadband property. The structure of designed array antenna became 40mm × 3.2mm × t1.6mm. We confirmed that this antenna has wider bandwidth (2.2GHz) and higher gain (6dBi). But this antenna size is too large for applying mobile device. Therefore we redesigned to reduce antenna size without specification degradation. The structure of redesigned antenna element becomes basically 4.8mm × 6.7mm × t1.0mm. This antenna has wider bandwidth (2.7GHz). The gains are more than 5dBi for the characteristic of this element in a band. Assume this antenna a fabric; 2 × 2 (4 elements: for mobile device) and 4 × 4 (16 elements: for small cell base station) we make an array antenna for Small cell base station and for mobile device. We will evaluate a beam steering examination with emission properties (gain, beam angle).

Wideband slot-loaded dipole for base station antenna element

2014 ◽  
Vol 56 (12) ◽  
pp. 2933-2937 ◽  
Author(s):  
Wenxia Yang ◽  
Hang Wong
Keyword(s):  
Base Station ◽  
Antenna Element

scholarly journals Boom motion trajectory generation approach for load sway rejection in rotary cranes considering double-pendulum effect

2020 ◽  
pp. 002029402094496
Author(s):  
Huimin Ouyang ◽  
Xiang Xu ◽  
Guangming Zhang
Keyword(s):  
Simple Structure ◽  
Double Pendulum ◽  
Motion Trajectory ◽  
Robust Performance ◽  
Excellent Performance ◽  
Simulation Data ◽  
Barbalat’S Lemma ◽  
Rotary Crane ◽  
Control Research ◽  
Invariance Theorem

In the control research on the rotary crane systems with double-pendulum effect, a motion trajectory with both simple structure and excellent robust performance is proposed to achieve the positioning of the boom and the suppression of the load sway. The presented trajectory consists of an anti-swing component and a boom positioning component, where the first part is used to achieve the sway angle elimination without affecting boom positioning; the second one is used to move the boom to the desired location precisely. The Lyapunov technique, LaSalle’s invariance theorem, and Barbalat’s lemma are used to prove the excellent performance of the method. Eventually, the effectiveness of the proposed method was verified through a large amount of simulation data analysis.

Half-Band Filter Design Based on MATLAB and FPGA

2011 ◽  
Vol 130-134 ◽  
pp. 2027-2030
Author(s):  
Jun Wu ◽  
Chao Fan Zhang
Keyword(s):  
Signal Processing ◽  
Simple Structure ◽  
Filter Design ◽  
Digital Signal ◽  
Fir Filter ◽  
Linear Phase ◽  
Excellent Performance ◽  
Rate System ◽  
Simulation Process ◽  
Band Filter

Half-band filter is a linear phase FIR filter, which is symmetric-even and odd .Because the coefficient of half-band filter is symmetrical and nearly half of the coefficient are zero, it make the filters reduce the number of multiplication operations by almost 3 / 4, and the number of addition operations by nearly half . The memory used to store filter coefficients are also reduced by half, so it make the implementation of efficient real-time digital signal processing more conducive. The half-band filter has many characteristics: for instance, simple structure, easy to implement and excellent performance, it is widely used in multi-rate system. This paper first describes the principle of half-band FIR filter, the character and method for implementation, then puts forward the design and simulation process which is based on MATLAB and Xilinx's half-band filter, and at last analyses the result.

A New Cooling Nitrogen Gas Generator and Experiments of High Speed Milling of Ti Alloy

2004 ◽  
Vol 471-472 ◽  
pp. 140-143 ◽  
Author(s):  
Ning He ◽  
Liang Li ◽  
X.L. Li
Keyword(s):  
High Speed ◽  
Simple Structure ◽  
Low Cost ◽  
Ti Alloy ◽  
Gas Generator ◽  
Excellent Performance ◽  
Nitrogen Gas ◽  
High Speed Milling ◽  
And Performance ◽  
Important Branch

Gas cooled cutting is an important branch of green machining technology with its excellent cooling performance and is used more and more widely in field of machining. A new method of developing cooling gas generator using semiconductor refrigeration is presented in this paper. Then the main principle, structure and performance of the generator are introduced. In addition, the experiments of high speed milling of Ti Alloy using cooled nitrogen gas were conducted and satisfactory results were achieved. These researches show that the new cooling gas generator has a series of merits such as simple structure, excellent performance, handy operation, low cost and significant spreading value etc.

scholarly journals Dual Band and Dual Diversity Four-Element MIMO Dipole for 5G Handsets

Sensors ◽  
2021 ◽  
Vol 21 (3) ◽  
pp. 767
Author(s):  
Muhammad Ali Jamshed ◽  
Masood Ur-Rehman ◽  
Jaroslav Frnda ◽  
Ayman A. Althuwayb ◽  
Ali Nauman ◽  
...  
Keyword(s):  
Multiple Input Multiple Output ◽  
Human Head ◽  
Dipole Antenna ◽  
Base Station ◽  
Dual Band ◽  
Head Model ◽  
Antenna Element ◽  
Total Efficiency ◽  
Large Space ◽  
Mobile Handset

The increasing popularity of using wireless devices to handle routine tasks has increased the demand for incorporating multiple-input-multiple-output (MIMO) technology to utilize limited bandwidth efficiently. The presence of comparatively large space at the base station (BS) makes it straightforward to exploit the MIMO technology’s useful properties. From a mobile handset point of view, and limited space at the mobile handset, complex procedures are required to increase the number of active antenna elements. In this paper, to address such type of issues, a four-element MIMO dual band, dual diversity, dipole antenna has been proposed for 5G-enabled handsets. The proposed antenna design relies on space diversity as well as pattern diversity to provide an acceptable MIMO performance. The proposed dipole antenna simultaneously operates at 3.6 and 4.7 sub-6 GHz bands. The usefulness of the proposed 4×4 MIMO dipole antenna has been verified by comparing the simulated and measured results using a fabricated version of the proposed antenna. A specific absorption rate (SAR) analysis has been carried out using CST Voxel (a heterogeneous biological human head) model, which shows maximum SAR value for 10 g of head tissue is well below the permitted value of 2.0 W/kg. The total efficiency of each antenna element in this structure is −2.88, −3.12, −1.92 and −2.45 dB at 3.6 GHz, while at 4.7 GHz are −1.61, −2.19, −1.72 and −1.18 dB respectively. The isolation, envelope correlation coefficient (ECC) between the adjacent ports and the loss in capacity is below the standard margin, making the structure appropriate for MIMO applications. The effect of handgrip and the housing box on the total antenna efficiency is analyzed, and only 5% variation is observed, which results from careful placement of antenna elements.

A simple and effective broadband decoupling structure for UWB-MIMO antenna

2021 ◽  
pp. 1-6
Author(s):  
Huiqing Zhai ◽  
Kunming Zhang ◽  
Yu Huo ◽  
Chaozong Guo
Keyword(s):  
Common Ground ◽  
Impedance Matching ◽  
Antenna Element ◽  
Portable Devices ◽  
Excellent Performance ◽  
Mimo Antenna ◽  
Measurement Results ◽  
New Type ◽  
Better Than ◽  
Microstrip Feed

Abstract A new type of closed square ring decoupling structure is proposed in this letter, which can effectively reduce the coupling of antennas. The designed antenna is composed of two elliptical monopoles and a common ground loaded with a broadband parasitic decoupling structure. Considering the impedance matching, each antenna element is changed from the original rectangular microstrip feed to a tapered microstrip feed and etched a circular slot on the elliptical monopole patch. By comparison with the original antenna without any decoupling structure, through loading the broadband decoupling structure on the ground, the antenna isolation is improved by 10 dB in most frequency bands. Comparing simulation and measurement results, the antenna achieves better than 25 dB isolation over the whole operating band (3.3–12 GHz). By manufacturing and testing the antenna designed in this article, the excellent performance parameters obtained also prove that the antenna can be used in portable devices.

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