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From Remcom (USA)
The release of an extremely wide spectrum of 3.110.6 GHz for commercial applications has greatly spurred the research and development of microwave ultrawideband (UWB) technology for communications, imaging, radar, and localization applications. In accordance, many techniques to broaden the impedance bandwidth of small antennas and to optimize the characteristics of the broadband antennas have been widely investigated. This article reviews the state of the art in broadband antennas for emerging UWB applications and addresses the important issues of the broadband antenna design for UWB applications. First, a variety of planar monopoles with finite ground planes are reviewed. Next, the roll antennas with enhanced radiation performance are outlined. After that, the planar antennas printing on PCBs are described. A directional antipodal Vivaldi antenna is also presented for UWB applications. Last, a UWB antenna for wearable applications is exemplified. Product Announcements
Topics of Interest
Overview
Organic binders have been known to humanity since the highest antiquity. With liana and interlaced ropes, they discovered the basic jointing technique, both for housing and for household...
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8.1 RATCHETS AND RATCHET GEARING
A ratchet is a form of gear in which the teeth are cut for one-way operation or to transmit intermittent motion. The ratchet wheel is used widely in machinery and...
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5.1 Overview
The various proprietary polymer-modified binders used in the UK asphalt industry are based mainly on thermoplastic elastomers or thermoplastic plastomers (Figures 22 and 23), although...
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Flanged End Connections
Flanged valves are perhaps the most widely used. Flanges used to mate valves with adjacent piping and/or equipment must conform to the following:
They must provide sufficient...
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In the impression die forging process, a press or hammer is used to pound or press metal into the desired shape. The hydraulic presses, mechanical presses and hammers used in this process have...
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