scholarly journals Demonstration of Tunable Shielding Effectiveness in GHz and THz Bands for Flexible Graphene/Ion Gel/Graphene Film

2021 ◽  
Vol 11 (11) ◽  
pp. 5133
Author(s):  
Lixiang Yao ◽  
Yuanlong Liang ◽  
Kui Wen ◽  
Yanlin Xu ◽  
Jibin Liu ◽  
...  
Keyword(s):  
Communication Systems ◽  
Sandwich Structure ◽  
Electronic Devices ◽  
Graphene Film ◽  
Wireless Communication Systems ◽  
Shielding Effectiveness ◽  
Dynamic Tuning ◽  
Low Profile ◽  
Effective Dynamic ◽  
Ion Gel

To satisfy the demands of wireless communication systems for tunable shielding materials, in this work, a graphene/ion gel/graphene sandwich structure is proposed, based on graphene and a solid ionic material ion gel. After modelling, preparing and testing, it was found that the structure could achieve more than 10 dB shielding effectiveness tuning in GHz and THz bands. Meanwhile, the adjusting speed of the structure was also studied, displaying effective dynamic tuning in the second order. Furthermore, the fabricated samples have the advantages of a low profile, easily conformable, and convenient processing, which are of great potential in emerging electronic devices.

scholarly journals A Planar Quasi-Yagi For Next Generation Wireless Communication Systems

2008 ◽  
Author(s):  
Mai Thanh Nga ◽  
Vu Van Yem ◽  
Nguyen Huu Thanh ◽  
Pham Duy Phong
Keyword(s):  
Global Positioning System ◽  
Communication Systems ◽  
Cell Phone ◽  
Wireless Communication Systems ◽  
Optimal Model ◽  
Low Profile ◽  
Yagi Antenna ◽  
Global Positioning ◽  
Universal Mobile Telecommunications System ◽  
Better Than

UMTS (Universal Mobile Telecommunications System) technology is one of the third-generation (3G) cell phone technologies, which is also being developed into a 4G technology. Although UMTS2001 is the most widely-deployed UMTS band, some countries utilize 1900 MHz instead. Besides, the co-existing GPS (Global Positioning System) operates at the frequency of 1575 MHz. Thus, a desirable antenna in UMTS systems needs to cover both of two bands in order to operate in various devices. This paper will propound an antenna covering the range of frequencies from 1.53 GHz to 2.53 GHz that includes 1.575 GHz, 1.8 GHz, 1.9 GHz ,and 2.1 GHz. The developed quasi-Yagi antenna has a simple-low profile and achieves a bandwidth of 48%, a front- to- back ratio of 19 dB, a gain of 6dBi, and an efficiency of better than 78% at 2.1GHz. In this paper, the study on effects of parameters of the antenna is also investigated to achieve optimal model.

scholarly journals A Low-Profile Wideband Monocone Antenna Using Bent Shorting Strips

2019 ◽  
Vol 9 (9) ◽  
pp. 1896 ◽  
Author(s):  
Kyo-Seung Keum ◽  
Young-Mi Park ◽  
Jae-Hoon Choi
Keyword(s):  
Reflection Coefficient ◽  
Wireless Communication ◽  
Communication Systems ◽  
Ground Plane ◽  
Experimental Results ◽  
Wireless Communication Systems ◽  
Impedance Bandwidth ◽  
Wide Bandwidth ◽  
Low Profile ◽  
Radiation Properties

A low-profile wideband monocone antenna with bent shorting strips, and parasitic and circular sleeves is proposed. By loading the bent shorting strips, parasitic sleeves, and circular sleeves, miniaturization of the antenna is achieved. Along with bent shorting strips from the monocone hat to the ground plane, parasitic sleeves, and circular sleeves are mounted to enhance the impedance bandwidth. From the experimental results, the –10 dB reflection coefficient bandwidth of the proposed antenna ranges from 810 MHz to 5340 MHz. In addition to the wide bandwidth characteristics, the proposed antenna has highly desirable omnidirectional radiation properties for wireless communication systems.

scholarly journals Design & Analysis of Multiband Sierpenski Gasket Fractal Antenna using Iteration Method

2019 ◽  
Vol 9 (2) ◽  
pp. 2924-2928
Keyword(s):  
Communication Systems ◽  
Impedance Matching ◽  
Sierpinski Gasket ◽  
Satellite Communications ◽  
Dielectric Substrate ◽  
Wireless Communication Systems ◽  
Fractal Antenna ◽  
Sierpiński Gasket ◽  
High Frequency Structure Simulator ◽  
Low Profile

Wireless communication systems require antennas of multiband support,small design dimensions and higher gain. To provide size reduction and better impedance matching, geometrical interpreted fractal antenna is suitable. This allows the antenna to operate at different frequencies. To rise performances with respect to bandwidth, gain and multiband resonance, an array can fulfil the requirements. This paper shows the design and simulation of the Sierpinski Gasket array for multiband applications (4GHz to 8GHz, 8GHz to 12GHz) up to 4th iteration. The fractal geometry for patch antenna is selected due to low cross polarization radiation and ease of fabrication. Sierpinski gasket is known by the name, Sierpinski triangle having triangular slots using mid-point geometry of the triangle. This array makes use of micro strip feed where FR4 epoxy is used as the dielectric substrate. A low profile dielectric is used to get the radiation in maximum amount. This antenna finds its uses in satellite communications and transmissions,Wi-Fi. The simulation is carried out by using High Frequency Structure Simulator HFSS V13 software for the proposed antenna.

scholarly journals Morphology of Koch Fractal Antenna

2014 ◽  
Vol 13 (2) ◽  
pp. 4157-4163 ◽  
Author(s):  
Vinita Mathur ◽  
Dr. Manisha Gupta
Keyword(s):  
Communication Systems ◽  
First Century ◽  
Wireless Communication Systems ◽  
Fractal Antenna ◽  
Radio Communication ◽  
Space Filling ◽  
Uwb Antennas ◽  
Low Profile ◽  
Low Profile Antennas ◽  
Multiple Frequencies

Antenna is paramount element for the radio communication entity using radio frequency and microwaves.  In twenty-first century wireless communication systems, there is a demand for wider bandwidth, multiband and low profile antennas for both commercial and military purposes. This has initiated antenna analysis in various directions; one of them is using fractal shaped antenna elements. Fractal concepts have emerged and advanced as a unique technique for designing compact UWB antennas, because of the self-similarityand space-filling attributes. In a fractal antenna, the multiple frequencies of operation depend on the total dimensions of the design and the scale factor. There are varied fractal geometries that have been found to be favorable in developing novel and new models for antennas. In this paper we will be discussing one such type of fractal antennas i.e. the Koch structure.  Koch antenna can be designed with a triangle, rectangle and pentagon as its initiator. Their geometry and parameters have been analyzed in this paper. 

scholarly journals Millimeter-Wave Microstrip Antenna Array Design and an Adaptive Algorithm for Future 5G Wireless Communication Systems

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Cheng-Nan Hu ◽  
Dau-Chyrh Chang ◽  
Chung-Hang Yu ◽  
Tsai-Wen Hsaio ◽  
Der-Phone Lin
Keyword(s):  
Antenna Array ◽  
Millimeter Wave ◽  
Antenna Arrays ◽  
Microstrip Antenna ◽  
Communication Systems ◽  
Minimum Mean Square Error ◽  
High Gain ◽  
Wireless Communication Systems ◽  
Low Profile ◽  
Microstrip Antenna Array

This paper presents a high gain millimeter-wave (mmW) low-temperature cofired ceramic (LTCC) microstrip antenna array with a compact, simple, and low-profile structure. Incorporating minimum mean square error (MMSE) adaptive algorithms with the proposed 64-element microstrip antenna array, the numerical investigation reveals substantial improvements in interference reduction. A prototype is presented with a simple design for mass production. As an experiment, HFSS was used to simulate an antenna with a width of 1 mm and a length of 1.23 mm, resonating at 38 GHz. Two identical mmW LTCC microstrip antenna arrays were built for measurement, and the center element was excited. The results demonstrated a return loss better than 15 dB and a peak gain higher than 6.5 dBi at frequencies of interest, which verified the feasibility of the design concept.

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