A Simple Method to Enhance Gain and Isolation of MIMO Antennas Simultaneously Based on Metamaterial Structures for Millimeter-Wave Applications

2021 ◽  
Author(s):  
Farzad Khajeh-Khalili ◽  
M. Amin Honarvar ◽  
Mohammad Naser-Moghadasi ◽  
Mehdi Dolatshahi
Keyword(s):  
Millimeter Wave ◽  
Simple Method ◽  
Mimo Antennas

Review on 5G Millimeter-Wave Antennas

2020 ◽  
pp. 44-76
Author(s):  
Mohamed Ismail Ahmed ◽  
Hala Mohammed Elsayed Mohammed Marzouk ◽  
Abdelhamid A. Shaalan
Keyword(s):  
Millimeter Wave ◽  
Mobile Communications ◽  
Millimeter Waves ◽  
Multiple Antennas ◽  
Small Space ◽  
Mimo Antennas ◽  
Data Rates ◽  
5G Mobile Communications ◽  
Mobile Handset ◽  
Millimeter Wave Antennas

Millimeter-wave antennas are the trend nowadays because of the necessity of higher data rates. Designing a supplementary efficient antenna capable of dealing with dual bands has several challenges. This chapter reports the problematic approaches introduced in the field of a millimeter wave design. Prevailing investigations in millimeter-waves and MIMO antennas have a tendency to emphasize discovering how to increase the data rate without the need of increasing the bandwidth and what type of antenna preferred in the 5G band. However, there is a little indication that researchers have come close to the issue of antenna integration in the mobile handset with the intent of adding multiple antennas with multi-band capability in a small space. Accordingly, the target of this chapter is to offer a summary of how the small-dimensional MIMO antennas with band duality for 5G mobile communications can be intended, designed, sustained and fabricated.

The Millimeter Wave Spectrum of DCNO: An Example of Current Measurements in the Frequency Range from 60 to 350 GHz

1974 ◽  
Vol 29 (4) ◽  
pp. 633-641 ◽  
Author(s):  
Manfred Winnewisser ◽  
Brenda P. Winnewisser
Keyword(s):  
Excited State ◽  
Millimeter Wave ◽  
Ground State ◽  
Preliminary Data ◽  
Wave Spectrum ◽  
Frequency Range ◽  
Simple Method ◽  
Efficient System ◽  
First Excited State ◽  
Bending Modes

An efficient system for preliminary data reduction is described which completes a recently developed data acquisition and reduction system for the measurement of millimeter wave absorption lines with the help of a dedicated computer. A simple method of automatically determining the absorption line centers is given. Rotational transitions of DCNO, measured with the above system, are reported for the ground state and the first excited state of each of the two bending modes ν4 and ν5. The rotational and rotation-vibration constants obtained for these states are B0 = 10,292.48340 (31) MHz, D0 = 3.5418 (10) kHz,Bν4 = 10,306.00780 (45) MHz, Dν4 = 3.6409 (22) kHz,Bν5 = 10,338.65942 (32) MHz, Dν5 = 3.6208 (16) kHz.The l-type doubling constants q.t0) and qt(1) agree with the values obtained previously from direct l-type doubling transitions.

Simple method for the determination of refractive indices and loss parameters for liquid-crystal materials in the millimeter-wave region

2005 ◽  
Vol 44 (7) ◽  
pp. 1150 ◽  
Author(s):  
Toshiaki Nose ◽  
Michinori Honma ◽  
Tatsuo Nozokido ◽  
Koji Mizuno
Keyword(s):  
Liquid Crystal ◽  
Millimeter Wave ◽  
Refractive Indices ◽  
Simple Method ◽  
Wave Region ◽  
Liquid Crystal Materials

Millimeter Wave MIMO Antennas

2021 ◽  
pp. 93-108
Author(s):  
Shiban Kishen Koul ◽  
Zamir Wani
Keyword(s):  
Millimeter Wave ◽  
Mimo Antennas

A Simple Method of Millimeter Wave Radar Installation Correction

2020 ◽  
Author(s):  
Xinli Xiong ◽  
Kuan Wang ◽  
Jianbin Chen ◽  
Zhoubing Xiong ◽  
Fenghua Liang ◽  
...  
Keyword(s):  
Millimeter Wave ◽  
Simple Method ◽  
Millimeter Wave Radar ◽  
Wave Radar

A simple way for producing holographic filters suitable for image improvement

1978 ◽  
Vol 36 (1) ◽  
pp. 226-227
Author(s):  
K.-H. Herrmann ◽  
E. Reuber ◽  
P. Schiske
Keyword(s):  
Transfer Functions ◽  
Diffraction Order ◽  
Lateral Position ◽  
Simple Method ◽  
Spatial Frequencies ◽  
Resolution Electron ◽  
Wiener Filters ◽  
Image Improvement ◽  
Optical Reconstruction ◽  
Set Up

Aposteriori deblurring of high resolution electron micrographs of weak phase objects can be performed by holographic filters [1,2] which are arranged in the Fourier domain of a light-optical reconstruction set-up. According to the diffraction efficiency and the lateral position of the grating structure, the filters permit adjustment of the amplitudes and phases of the spatial frequencies in the image which is obtained in the first diffraction order.In the case of bright field imaging with axial illumination, the Contrast Transfer Functions (CTF) are oscillating, but real. For different imageforming conditions and several signal-to-noise ratios an extensive set of Wiener-filters should be available. A simple method of producing such filters by only photographic and mechanical means will be described here.A transparent master grating with 6.25 lines/mm and 160 mm diameter was produced by a high precision computer plotter. It is photographed through a rotating mask, plotted by a standard plotter.

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