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Antennas and Cables
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working When you can design and create an antenna for a very specific frequency range, and especially for a range as high as 24 or 58 GHz, you can take advantage of the shorter wavelength, which affects not only the dipole antenna size but also the length, spacing, and number of directing elements, to create a lot of signal gain in a very small mechanical package
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Figure 45 The basic form and radiation pattern of a Yagi-type antenna
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As with omnidirectional antennas designed to provide signal gain by forcing the radiation pattern into a narrower shape, Yagi or beam antennas do the same thing plus add the advantage of concentrating the signal radiation into a specific direction The simple rule is more gain less pattern area but stronger signal in the direction of the pattern (see Figures 46 through 48)
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Figure 46 A top view of the typical radiation pattern from a relatively short vertically polarized Yagi antenna The dots represent the individual vertical elements of the antenna
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Figure 47 The narrower radiation pattern of a larger Yagi antenna
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Figure 48 A picture of a commercially manufactured ring Yagi antenna (Photo courtesy of Hypertechlinkcom)
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One of the simplest and most impressive antennas you can use with wireless networking can be built with about $10 worth of parts from your local hardware store and two easy to find electronic pieces The project is known affectionately and specifically as the Pringles Can Yagi yes, the Pringles potato chips in the tall red can available at grocers nearly everywhere! See Figure 49
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Figure 49 A photo of a homemade Pringles can ring Yagi antenna
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Antennas and Cables
First created by Rob Flickenger and documented at http://wwworeillynetcom/cs/weblog/view/wlg/448/, the Pringles can antenna is a wireless tinkerer s pet project Because the main structural material is merely cardboard, and the electrical characteristics of this implementation are not ideal for 24 GHz, the can-tenna offers an opportunity to play with antenna construction and toy with the magic of RF, but it is not suitable for long-term or reliable commercial use In antenna terms, the can-tenna is really a ring Yagi, imitating the antennas many precable TV services installed on home rooftops to receive broadcasts of select movie content, and those initially deployed by WavePath, a wireless Internet service provider in the San Francisco area, before being acquired and replaced by Sprint Broadband wireless services The feed element is a 1/4 wavelength wire The RF signal applied to the wire is induced into the elements of the antenna The wire also picks up RF signal induced upon it from the elements This antenna, as constructed, does not stand up to the laws of physics and accepted antenna design because the elements the hardware store washers are too small (less than 1/4 wavelength) for use in the 24 GHz 80211b band, but it does provide positive results What does this criticism mean At the very least, a properly designed ring Yagi for 24 GHz would have circular elements approximately 1-1/4 inches in diameter, rather than smaller 1-inch washers Using smaller than appropriate washers means the signal pickup and radiation are inefficient at best, and may have a negative influence on the transmitted or received signal at worst Specifically, if the antenna elements are not the proper size for the frequency used, it will not be resonant When an RF signal is applied a nonresonant antenna, some of the power that is applied reflects back to the source (in the case of transmitting) or is lost to the atmosphere (in the case of receiving) Reflecting power back to a transmitter can damage the radio s internal circuits they are designed to put out power, not absorb it, and as a result, excessive heating and high electrical currents can break the transmitting circuits Broken transmitting circuits can often cause excessive power to get into the receiving circuits and desensitize or damage them as well
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