|
Server : Apache/2.4.62 System : FreeBSD fbsdweb2.web.rcn.net 14.1-RELEASE FreeBSD 14.1-RELEASE releng/14.1-n267679-10e31f0946d8 GENERIC amd64 User : www ( 80) PHP Version : 8.3.8 Disable Function : NONE Directory : /domains/remotesensing/products/ |
Upload File : |
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<!-- adapted from a Design by: <a href="http://businesswebsitetemplates.blogspot.com"title="free templates">FREE BUSINESS TEMPLATES</a> -->
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<meta name="keywords" content="GPS, GNSS, Software, Hardware, Research and Development, R&D, Navigation, Signal Simulator, Signal Generator, Receiver, Simulator, Emulator, Transceiver, Front End, RF, Impulse, Real Time, SigSim, Data Acquisition, Galileo, Glonass, UTC, Ultra Tightly Coupled, INS, Ionospheric Receiver, Pseudolite, Radar, Software Radar, Radio, Software Radio, HF Diagnostics, Microwave Rain Gauge, Data Logger, EM Sensor, Jammer, Antenna, FPGA, DSP, High Performance Board, Suman Ganguly, Virginia, Fairfax, SBIR, Small Business, Engineering, Electromagnetics, Signal Processing, Space Weather, Instrumentation, Electronics, Analyzers, Surveillance, Computer Systems, Image Processing, Material Science, Microwave, Electrical Engineering, Electronics Engineering, Upconverter, Downconverter, LNA, L1, L2, L5, C/A, P-Code, Encryption, Ionospheric Sounder, Sounder, spoofer, EW, electronic warfare, C3I, Signal Analyzer, Signal Processor, ST Radar, MST Radar, IST Radar, SAR, GPS Receivers, GNSS Receivers, GPS Simulators, GNSS Simulator, Rain Radar, Ultra Wide Band Radar, Ground Penetrating Radar, HF Radar, Ionosonde, HF Diagnostic, OTH Radar, Satellite Simulator, Communication Simulator, Channel Simulator, Radar Simulator, Attitude Determination, Anti-Jam Receiver"/>
<title>CRS | Products & Services | Electromagnetics and Antennas | Broadband Antennas</title>
<link href="style.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div id="wrapper">
<div id="header">
<div id="logo">
<img src="images/crslogo.png" class="floatTL" alt="business" /><br><br><br><br><br>
<div id="nav">
<!-- Css Menu -->
<style>
ul.cssMenu ul{display:none}
ul.cssMenu li:hover>ul{display:block}
ul.cssMenu ul{position: absolute;left:-1px;top:98%;}
ul.cssMenu ul ul{position: absolute;left:98%;top:-2px;}
ul.cssMenu,ul.cssMenu ul {
margin:0px;
list-style:none;
padding:0px 1px 1px 0px;
background-color:#13264d;
background-repeat:repeat;
border-color:#A6A6A6;
border-width:0px;
border-style:solid;
}
ul.cssMenu table {border-collapse:collapse}ul.cssMenu {
display:block;
zoom:1;
float: right;
}
ul.cssMenu ul{
width:197.4px;
}
ul.cssMenu li{
display:block;
margin:1px 0px 0px 1px;
font-size:0px;
}
ul.cssMenu a:active, ul.cssMenu a:focus {
outline-style:none;
}
ul.cssMenu a, ul.cssMenu li.dis a:hover, ul.cssMenu li.sep a:hover {
display:block;
vertical-align:middle;
background-color:#13264d;
border-width:0px;
border-color:#FCEEB0;
border-style:solid;
text-align:left;
text-decoration:none;
padding:5px;
_padding-left:0;
font:12px Arial;
color: #ffffff;
text-decoration:none;
cursor:pointer;
}
ul.cssMenu span{
overflow:hidden;
}
ul.cssMenu li {
float:left;
}
ul.cssMenu ul li {
float:none;
}
ul.cssMenu ul a {
text-align:left;
white-space:nowrap;
}
ul.cssMenu li.sep{
text-align:left;
padding:0px;
line-height:0;
height:100%;
}
ul.cssMenu li.sep span{
float:none; padding-right:0;
width:3;
height:100%;
display:inline-block;
background-color:#A6A6A6; background-image:none;}
ul.cssMenu ul li.sep span{
width:100%;
height:3;
}
ul.cssMenu li:hover{
position:relative;
}
ul.cssMenu li:hover>a{
background-color:#93AEE6;
border-color:#4C99AB;
border-style:solid;
font:12px Arial;
color: #FFFFFF;
text-decoration:none;
}
ul.cssMenu li a:hover{
position:relative;
background-color:#93AEE6;
border-color:#4C99AB;
border-style:solid;
font:12px Arial;
color: #FFFFFF;
text-decoration:none;
}
ul.cssMenu li.dis a {
color: #AAAAAA !important;
}
ul.cssMenu img {border: none;float:left;_float:none;margin-right:5px;width:16px;
height:16px;
}
ul.cssMenu ul img {width:16px;
height:16px;
}
ul.cssMenu img.over{display:none}
ul.cssMenu li.dis a:hover img.over{display:none !important}
ul.cssMenu li.dis a:hover img.def {display:inline !important}
ul.cssMenu li:hover > a img.def {display:none}
ul.cssMenu li:hover > a img.over {display:inline}
ul.cssMenu a:hover img.over,ul.cssMenu a:hover ul img.def,ul.cssMenu a:hover a:hover img.over{display:inline}
ul.cssMenu a:hover img.def,ul.cssMenu a:hover ul img.over,ul.cssMenu a:hover a:hover img.def{display:none}
ul.cssMenu a:hover ul{display:block}
ul.cssMenu span{
display:block;
background-image:url(./images/arrv_blue_2.gif);
background-position:right center;
background-repeat: no-repeat;
padding-right:8px;}
ul.cssMenu li:hover>a>span{ background-image:url(./images/arrv_white_2.gif);
}
ul.cssMenu a:hover span{ _background-image:url(./images/arrv_white_2.gif)}
ul.cssMenu ul span,ul.cssMenu a:hover table span{background-image:url(./images/arr_blue_2.gif)}
ul.cssMenu ul li:hover > a span{ background-image:url(./images/arr_white_2.gif);}
ul.cssMenu table a:hover span{background-image:url(./images/arr_white_2.gif)}
ul.cssMenu li a.cssMenui0{
font:n;
}
ul.cssMenu li a.cssMenui0:hover{
font:o;
}
</style>
<ul class="cssMenu cssMenum">
<li class=" cssMenui0"><a class=" cssMenui0" href="../index.html">Home</a></li>
<li class=" cssMenui0"><a class=" cssMenui0" href="products.html"><span>Products & Services</span><![if gt IE 6]></a><![endif]><!--[if lte IE 6]><table><tr><td><![endif]-->
<ul class=" cssMenum">
<li class=" cssMenui"><a class=" cssMenui" href="gps.html">GPS & Navigation Systems</a></li>
<li class=" cssMenui"><a class=" cssMenui" href="radio.html">Radio and Radar Systems</a></li>
<li class=" cssMenui"><a class=" cssMenui" href="signal.html">Signal Processing & Analyzers</a></li>
<li class=" cssMenui"><a class=" cssMenui" href="antenna.html">E.M. Sensors & Antenna Types</a></li>
<li class=" cssMenui"><a class=" cssMenui" href="space.html">Space Weather Systems</a></li>
<li class=" cssMenui"><a class=" cssMenui" href="instru.html">Instrumentation</a></li>
</ul>
<!--[if lte IE 6]></td></tr></table></a><![endif]--></li>
<li class=" cssMenui0"><a class=" cssMenui0" href="../research/research.html"><span>Research & Development</span><![if gt IE 6]></a><![endif]><!--[if lte IE 6]><table><tr><td><![endif]-->
<ul class=" cssMenum">
<li class=" cssMenui"><a class=" cssMenui" href="../research/navigation.html">Advanced Navigation Systems</a></li>
<li class=" cssMenui"><a class=" cssMenui" href="../research/radio.html">Radio & Radar Engineering</a></li>
<li class=" cssMenui"><a class=" cssMenui" href="../research/em.html">Electromagnetics</a></li>
<li class=" cssMenui"><a class=" cssMenui" href="../research/signal.html">Signal & Image Processing</a></li>
<li class=" cssMenui"><a class=" cssMenui" href="../research/surv.html">Surveillance</a></li>
<li class=" cssMenui"><a class=" cssMenui" href="../research/physics.html">Space Weather & Physics</a></li>
<li class=" cssMenui"><a class=" cssMenui" href="../research/comp.html">Computer Systems & Software</a></li>
<li class=" cssMenui"><a class=" cssMenui" href="../research/ee.html">Electrical Engineering</a></li>
<li class=" cssMenui"><a class=" cssMenui" href="../research/science.html">Microwave/Material Science</a></li>
<li class=" cssMenui"><a class=" cssMenui" href="../research/instru.html">Instrumentation</a></li>
</ul>
<!--[if lte IE 6]></td></tr></table></a><![endif]--></li>
<li class=" cssMenui0"><a class=" cssMenui0" href="../publications/public.html"><span>Publications</span><![if gt IE 6]></a><![endif]><!--[if lte IE 6]><table><tr><td><![endif]-->
<ul class=" cssMenum">
<li class=" cssMenui"><a class=" cssMenui" href="../publications/journals.html">Journals</a></li>
<li class=" cssMenui"><a class=" cssMenui" href="../publications/conf.html">Conference Proceedings</a></li>
<li class=" cssMenui"><a class=" cssMenui" href="../publications/reports.html">Reports & Patents</a></li>
<li class=" cssMenui"><a class=" cssMenui" href="../publications/press.html">Press Releases</a></li>
</ul>
<!--[if lte IE 6]></td></tr></table></a><![endif]--></li>
<li class=" cssMenui0"><a class=" cssMenui0" href="../profile/pro.html"><span>About Us</span><![if gt IE 6]></a><![endif]><!--[if lte IE 6]><table><tr><td><![endif]-->
<ul class=" cssMenum">
<li class=" cssMenui"><a class=" cssMenui" href="../profile/pro.html">Profile</a></li>
<li class=" cssMenui"><a class=" cssMenui" href="../profile/bckgd.html">Background</a></li>
<li class=" cssMenui"><a class=" cssMenui" href="../profile/mission.html">Mission</a></li>
<li class=" cssMenui"><a class=" cssMenui" href="../profile/capabilities.html">Capabilities</a></li>
<li class=" cssMenui"><a class=" cssMenui" href="../profile/personnel.html">Personnel</a></li>
<li class=" cssMenui"><a class=" cssMenui" href="../profile/accom.html">Accomplishments</a></li>
<!--<li class=" cssMenui"><a class=" cssMenui" href="../profile/career.html">Careers</a></li>-->
<li class=" cssMenui"><a class=" cssMenui" href="../profile/contact.html">Contact Us</a></li>
</ul>
<!--[if lte IE 6]></td></tr></table></a><![endif]--></li>
<li class=" cssMenui0"><a class=" cssMenui0" href="brochures.html">Brochures</a></li>
</ul>
<br> </div>
<div id="bg">
</div>
<div id="main">
<div id="leftcolumn">
<div id="logo">
<h1>Electromagnetics and Antennas</h1>
<h2><a href="../pdf/Broadband Direction Finding Antenna.pdf">Broadband Antennas</a></b></h2>
<p>CRS developed a variety of antennas for broadband (1:10) and multiband operation. These antennas have been used for DF applications, for body-worn applications, and for various communication and surveillance application. An example of a broadband antenna is shown here. It has a specialized backing, making it almost conformal with metallic surfaces.</p>
<br><center><img src="images/ElectroSensBroad02.jpg" width="250" alt="business" /><br><br><img src="images/ElectroSensBroad03.jpg" alt="business" /><br><i>UHF microwave antenna<br>L = 20 cm, W = 7.5 cm<br>Simulated return loss</i><br><br><img src="images/ElectroSensBroad05.jpg" alt="business" /><br><i>Measured antenna pattern</i></center><br>
<p>The unique structure shown above has been developed by CRS. It has very desirable characteristics for wideband antenna applications. The geometry of the antenna element and the properties of the back material have been carefully engineered to achieve maximum bandwidth and gain with reduced antenna aperture. The conventional antenna suffers from the ground effect of the mounting structures (aircraft or ship body). The CRS antenna uses multiple matching layers, eliminating the destructive image created by the mounting structures. The antenna can be attached to any platform without degrading the antenna performance.
<br><br>
CRS antenna requires only a � wavelength of the antenna length to cover the low-frequency limit of the antenna bandwidth (normally, a half wavelength is required for dipole type). Single-element achieves 1:40 bandwidth and combination of multiple scaled elements enables one to build any arbitrary bandwidth greater than 1:40. A VSWR plot of a sample antenna is shown above. The antenna maintains VSWR<2.5 over 60MHz to 2GHz range (plot only shows up to 1.2GHz).
</p><br><div class="blockquote">
<div class="box">
<ul><li>
CRS provides a novel set of antennas for extremely broadband DF operation.</li>
<li> Utilize novel multi-element design (patent pending) providing extremely compact elements with uniform patterns over very broad bands.</li>
<li> F1/F2 denotes the frequency coverage in MHz</li>
<li> These antennas provide:</li>
<ul><li> Uniform amplitude and phase patterns over a very large bandwidth</li>
<li> Compact and rigid</li>
<li> Broadband (VSWR < 3), 100 MHz to 5 GHz</li></ul>
</li></ul>
</div></div><br>
</div></div>
<div id="rightcolumn">
<div class="blockquote">
<div class="box">
<h2>E.M. & Antennas</h2>
<ul>
<li> <a href="antennafluxgate.html">Fluxgate Sensors</a></li>
<li> <a href="antennainduction.html">Induction coil-sensors</a></li>
<li> <b>Broadband antennas covering HF to GHz</b></li>
<li> <a href="antennafractal.html">Multiband fractal antennas</a></li>
<li> <a href="antennagpsband.html">GPS and cellular band antennas</a></li>
<li> <a href="antennaem.html">EM modeling tools</a></li>
</ul>
</div></div><br><div class="blockquote">
<div class="box"><center><b><a href="../pdf/Broadband Direction Finding Antenna.pdf">Broadband Direction Finding Antenna</a></b> (brochure)</center></div></div><br>
<center><br><br><br><br><br><br><img src="images/ElectroSensBroad04.jpg" alt="business" /><br><i>30MHz microwave antenna<br>L = 122 cm, W = 12 cm<br>Measured VSWR</i><br>
<br><img src="images/ElectroSensBroad06.jpg" alt="business" />
<br><i>Measured antenna pattern</i><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><img src="images/DFantenna3.jpg" width="250" alt="business" /></center><br>
</div>
</div>
<div id="footer"><p>Copyright © 2010 | <a href="../profile/mission.html">mission</a> | <a href="../profile/contact.html">contact us</a> | <!--<a href="../profile/careers.html">careers</a> | --><a href="../sitemap.html">site map</a> | <a href="../search.html">search</a></p></div>
</div>
</body>
</html>