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Radio people from CBers to ham radio operators to commercial radio engineers know that power reflected back to a transmitter, reflected power, measured in relative dB, watts of power, or standing wave ratio (VSWR) is a bad thing Those of us who work with radio signals strive to make our connections and tune our antennas for minimal power reflected back into transmitting devices In most cases, we have test equipment to measure either the forward transmitted and reverse/reflected power, the standing wave ratio, or both to help us assess our antenna systems Unfortunately, such equipment is too expensive for one-time use in setting up a wireless network system, and the transmit power levels for wireless networking are so low (30 to 250 mW) that accurate measurement is difficult at best anyway Simply, a mismatched antenna, or any mismatched connection at an RF transmitting device, can harm your radio in this case, your access point, add-on power amplifier, or PC card Thus, long-term use of a less than optimal antenna like the Pringles can project is not recommended Receivers generally do not care too much if they are connected to a nonresonant antenna, but they will not work as well and may be subject to significant amounts of interference from other signals Any one of several widely available, commercially made antennas specifically designed for wireless networking service is preferred and highly recommended for serious long-term wireless networking use Although premade antennas are seemingly expensive for the small amount of metal involved, a few dollars spent on the correct antenna, and the correct cable to connect to it, can save you a lot more than the cost of having to replace damaged access points and PC cards because you used the wrong antenna or went the budget route on cheap cable and connectors The ring Yagi antenna, as demonstrated with the Pringles can project, is but one of several types of directional antennas that make our desired wireless signal stronger by focusing it in a specific direction The ring Yagi is a variation on the dipole and more conventional wire element Yagi as you see in TV antennas, on the roofs of ham radio operators, or in commercial service on some buildings and radio towers Experimentation and engineering have produced flat panel-style antennas that provide signal gain and directivity, as well as a strange variation on the Yagi called a helical antenna
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A helical antenna is no more or less than a precisely wound coil of wire tuned to the RF of interest The radiation pattern is very focused and, as may be anticipated, radiates out in the direction of the helical turns, rather than essentially flat in either the horizontal or vertical plane Signal gain is determined by the number of turns, again in proportion to a number of 1/4 wavelengths Physically, this antenna resembles the commercially made Yagi shown in Figure 48 Other types of directional antennas include the parabolic or dish antenna, as you might see used for satellite television reception or with a grid reflector, as shown in Figure 410
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Figure 410 A commercially made parabolic dish antenna with wire grid reflector (Photo courtesy of Hypertechlinkcom)
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Parabolic or dish antennas provide much higher signal gain, typically 24 dB, within a reasonably compact size, compared to using extremely long Yagi antennas They have little or no signal radiated to or picked up from the back side of the antenna Flat panel antennas offer high directional gain and little or no signal presence to the rear of the antenna and have a visually less obtrusive appearance suitable for melding into building architectures, made into decorative ornamentation, and attaching easily to walls, rather than being mounted on gnarly bits of piping and brackets (see Figure 411)
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Figure 411 The author s flat panel antenna mounted on a tall mast This antenna is used for Sprint Broadband wireless Internet access, affectionately known as a pizza box
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