Ultra-Wideband Technology for Military Applications

Author(s):  
Dong-Seong Kim ◽  
Hoa Tran-Dang
Author(s):  
Sanjeev Kumar ◽  
Ravi Kumar ◽  
Durgesh Nandan

Background & Objective: The circular slotted monopole microstrip antenna with Coplanar Waveguide (CPW) feed for unified GSM and Ultra-Wideband (UWB) applications have been presented in this article. Circular shaped slots have been embedded in the radiating patch. Less surface area has been found due to slots etching and the overall antenna size is reduced by 45%. Result: The proposed antenna demonstrates a double band operation wrapping 883.6-1206 MHz (GSM band) and 2.75-18.30 GHz (UWB, X, and Ku) frequency band with VSWR of less than 2 and fractional B. W. of 30.8 % and 147% respectively. The pattern of radiation presented by the antenna is nearly omnidirectional in H-plane and directional in E-plane within the GSM and UWB band. Conclusion: There is a variety of applications nowadays using these UWB antennas such as modern civil and military applications, wireless and radar communications, etc. Measured results are presented to validate the proposed antenna structure, which shows that the proposed designed antenna structure has a stable radiation pattern both at the GSM and UWB band ranges.


2021 ◽  
Author(s):  
P. Mercy ◽  
K. S. Joseph Wilson

Abstract This article takes a research on a novel design of a multiband slotted microstrip patch antenna. It depicts a multi ultra wideband compressed and developed antenna with double F- slots, four rectangular slots, and side corner cuttings on the patch using partial Ground. The proposed multiband microstrip patch antenna can resonate at six unique frequencies between 8 GHz and 19 GHz in X and ku bands and execute the reflected power of − 23.8351 dB, − 32.9380 dB, − 14.6726 dB, − 22.2810 dB, − 19.0592 dB, and − 18.8137 dB at 8.6181 GHz, 12.3116 GHz, 14.1960 GHz, 15.6281 GHz, 18.1910 GHz, and 18.9447 GHz, respectively. The gained voltage standing wave ratio (VSWR) is less than 1(0.3918). A maximum directivity and gain of 6.9104 dB and 6.3769 dB is achieved at the resonating bands. Moreover, the effectiveness of the proposed multi-band patch antenna has been verified through the radiation pattern and radiation efficiency of measured results. The low size, weight, and cost of the geometry of this antenna make it entice for Radar engineering, police radars for measuring the speed of the vehicles, for military applications, for navigation intentions, and in finding out the weather forecast and Satellite broadcast communication, space-crafts, wireless computer networks, etc.


Author(s):  
John R. Devaney

Occasionally in history, an event may occur which has a profound influence on a technology. Such an event occurred when the scanning electron microscope became commercially available to industry in the mid 60's. Semiconductors were being increasingly used in high-reliability space and military applications both because of their small volume but, also, because of their inherent reliability. However, they did fail, both early in life and sometimes in middle or old age. Why they failed and how to prevent failure or prolong “useful life” was a worry which resulted in a blossoming of sophisticated failure analysis laboratories across the country. By 1966, the ability to build small structure integrated circuits was forging well ahead of techniques available to dissect and analyze these same failures. The arrival of the scanning electron microscope gave these analysts a new insight into failure mechanisms.


Author(s):  
Nadia Ghariani ◽  
Mohamed Salah Karoui ◽  
Mondher Chaoui ◽  
Mongi Lahiani ◽  
Hamadi Ghariani

2009 ◽  
Vol E92-B (1) ◽  
pp. 143-149
Author(s):  
Sen-Hung WANG ◽  
Chih-Peng LI ◽  
Chao-Tang YU ◽  
Jian-Ming HUANG ◽  
Chua-Chin WANG

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