Antenna Miniaturization Using Flexible PBG Materials

2003 ◽  
Author(s):  
Pekka Salonen ◽  
Lauri Syda¨nheimo ◽  
Mikko Keskilammi
Keyword(s):  
Stop Band ◽  
Microstrip Antennas ◽  
Major Effect ◽  
Radiation Efficiency ◽  
Performance Parameters ◽  
Market Place ◽  
Integrated Antennas ◽  
Improved Performance ◽  
Flexible Antenna ◽  
High Dielectric

Antennas play a paramount role today’s communication centered market place. Recently the demands for miniaturization of electronic devices have increased rapidly in which a miniaturization of integrated antennas has confronted the same development. However, antennas and especially the performance parameters of antennas obey physical laws in which the electrical dimensions of an antenna have a major effect on these parameters such as voltage standing wave ratio (SWR) and radiation efficiency. Recently, a new, multidisciplinary field of study called “Electromagnetic BandGap” (EBG) structures have been developed. An EBG structure forms a lattice whose period determines its resonant frequency i.e. the range of frequencies where the stop band exists for transmission of microwave signals. Antennas physical dimensions can be made noticeably smaller applying EBG materials. These advantages of EBG structures allow us to design smaller antennas with high radiation efficiency on high-dielectric substrates such as ceramics. This paper presents how conventional microstrip antennas can be miniaturized using EBG materials with improved performance parameters. In addition, a novel flexible antenna is presented which can be rolled up during e.g. transportation.

scholarly journals Prediction of Slot Shape and Slot Size for Improving the Performance of Microstrip Antennas Using Knowledge-Based Neural Networks

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Taimoor Khan ◽  
Asok De
Keyword(s):  
Neural Networks ◽  
Artificial Neural Networks ◽  
Prior Knowledge ◽  
Neural Model ◽  
Microstrip Antennas ◽  
Performance Parameters ◽  
Dual Frequency ◽  
Knowledge Based ◽  
Slot Size ◽  
Good Agreement

In the last decade, artificial neural networks have become very popular techniques for computing different performance parameters of microstrip antennas. The proposed work illustrates a knowledge-based neural networks model for predicting the appropriate shape and accurate size of the slot introduced on the radiating patch for achieving desired level of resonance, gain, directivity, antenna efficiency, and radiation efficiency for dual-frequency operation. By incorporating prior knowledge in neural model, the number of required training patterns is drastically reduced. Further, the neural model incorporated with prior knowledge can be used for predicting response in extrapolation region beyond the training patterns region. For validation, a prototype is also fabricated and its performance parameters are measured. A very good agreement is attained between measured, simulated, and predicted results.

Time difference amplifier design with improved performance parameters

2012 ◽  
Vol 48 (10) ◽  
pp. 562 ◽  
Author(s):  
A.N.M. Alahmadi ◽  
G. Russell ◽  
A. Yakovlev
Keyword(s):  
Time Difference ◽  
Performance Parameters ◽  
Amplifier Design ◽  
Improved Performance

scholarly journals Transformational Leadership: Implications for Organizational Competitive Advantage

2014 ◽  
Vol 4 (1) ◽  
pp. 276
Author(s):  
Kelechi John Ekuma
Keyword(s):  
Transformational Leadership ◽  
Competitive Advantage ◽  
Leadership Style ◽  
Global Market ◽  
Organisational Performance ◽  
Market Place ◽  
Leadership Theories ◽  
Organisational Effectiveness ◽  
Improved Performance ◽  
And Performance

There is a growing consensus among scholars and practitioners alike that maximising the potentials of human resources is central to organisational effectiveness and improved performance in the 21st century global market place of intense competition. It has also been suggested that the ways in which organisational leaders manage people can remarkably influence company performances and competitiveness. Despite this realisation however, scholars, managers and practitioners alike disagree on the most appropriate approach to organisational leadership. Indeed, there is an on-going debate about the leadership style that yields the best results for organisations in contemporary times. And whilst the debates rage, an increasingly dominant discourse is that transformational leadership is central to organisational effectiveness and gaining of competitive advantage. This notwithstanding, the most fundamental issue remains how to understand how transformational leadership practices impact on performance in practical terms. Consequently, producing an unequivocal response to the question ‘what does transformational leadership really contribute to organisational performance?’ has remained elusive. It is against this backdrop, that this article critically evaluates the concept of Transformational Leadership (henceforth TL), with a view of highlighting its contributions to organisational effectiveness and performance. Synthesising organisational and leadership theories and integrating literatures in organisational development and HR, the paper argues that there are evidences to suggest that there are clear linkages between TL, organisational effectiveness and improved performance. The paper further contends that emotional intelligence is key to the operationalization of TL and concludes that the greatest challenge remains how to quantify the contributions of TL in practical terms.

scholarly journals Broadband microstrip patch antenna at 28 GHz for 5G wireless applications

2021 ◽  
Vol 11 (3) ◽  
pp. 2238
Author(s):  
Kinde Anlay Fante ◽  
Mulugeta Tegegn Gemeda
Keyword(s):  
Patch Antenna ◽  
Return Loss ◽  
Substrate Material ◽  
Microstrip Patch Antenna ◽  
Radiation Efficiency ◽  
Center Frequency ◽  
Sidelobe Level ◽  
Wireless Applications ◽  
Microstrip Patch ◽  
Improved Performance

In this paper, a 28 GHz broadband microstrip patch antenna (MSPA) for 5G wireless applications is presented. The Rogers RT/Duroid5880 substrate material, with a dielectric constant of 2.2, the thickness of 0.3451 mm, and loss tangent of 0.0009, is used for the studied antenna to operate at 28 GHz center frequency. The proposed design of antenna is simulated by using CST studio suite. The simulation results highlight that the studied antenna has a return loss of -54.49 dB, a bandwidth of 1.062 GHz, a gain of 7.554 dBi. Besides, radiation efficiency and the sidelobe level of the proposed MSPA are 98% and 18.4 dB, respectively. As compared to previous MSPA designs reported in the recent scientific literature, the proposed rectangular MSPA has achieved significantly improved performance in terms of the bandwidth, beam-gain, return loss, sidelobe level, and radiation efficiency. Hence, it is a potential contender antenna type for emerging 5G wireless communication applications.

Research on Anti-Collision Algorithm of Short Distance Data Communication Based on Binary-Tree Disassembly

2014 ◽  
Vol 686 ◽  
pp. 354-358
Author(s):  
Zhong Yue Hu
Keyword(s):  
Binary Tree ◽  
Search Algorithm ◽  
Data Communication ◽  
Search Process ◽  
Performance Parameters ◽  
Slot Allocation ◽  
Tree Algorithm ◽  
Distance Data ◽  
Simulation Results ◽  
Improved Performance

This paper puts forward adaptive anti collision algorithm based on two fork tree decomposition. New search algorithm built on the basis of binary-tree algorithm, using the uniqueness of the label EPC, to estimate the distribution of label by slot allocation, the huge and complicated two fork tree is decomposed into several simple binary-tree by search the collision slots for binary-tree, so, it can simplifies the search process. The algorithm fully considers4 important performance parameters of the reader paging times, transmission delay, energy consumption and throughput label, the simulation results show that, the improved anti-collision algorithm is obviously improved performance than other two fork tree algorithm, it is more suitable for RFID anti-collision protocols.

Power dependence of radiation efficiency of circularly polarized YBa2Cu3O7 microstrip antennas

1997 ◽  
Vol 282-287 ◽  
pp. 2513-2514
Author(s):  
M.H. Zhu ◽  
B.S. Cao ◽  
X.X. Zhang ◽  
N. Li ◽  
Y.J. Wang ◽  
...  
Keyword(s):  
Microstrip Antennas ◽  
Radiation Efficiency ◽  
Power Dependence ◽  
Circularly Polarized
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