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MIKE MEYERS COMPTIA RFID+ CERTIFICATION PASSPORT
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perpendicular to the H plane, it has a transmission pattern like a figure 8 These planes are shown on the right side of Figure 2-16 It has nulls, no power radiated, along the north and the south poles
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Remember that a dipole antenna has nulls at its north and south poles Therefore, when a tag antenna pole is pointing in the direction perpendicular to interrogator antenna plane, the tag cannot be interrogated
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When several antenna elements usually single wire dipoles and reflectors are combined, they form an antenna array This provides a particular
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CHAPTER 2 The RF in RFID
radiation pattern and gain in a desired direction or is useful when it is difficult to achieve desired electrical properties with a single antenna Two common antenna arrays are the Yagi-Uda antenna, usually called Yagi, and the patch antenna The Yagi antenna is sometimes called a beam antenna This antenna was common before cable and satellite for television and was mounted on roofs for receiving television transmission Patch antenna consists of a thin square of conducting material, approximately half wavelength on a side that is closely spaced above a larger reflector plane The center point of this active element may be grounded using a vertical conductor A patch antenna can be thought of as a pair of half wavelength slot antennas, spaced by half a wavelength The antenna impedance varies with the location of the feed point for the active element The active elements may be of almost any shape, including round and square A square active element has approximately 047 wavelengths on each side, while a round one is 054 wavelengths in diameter The spacing between the active element and the reflector is > 001 wavelength, and spacing less than this results in reduced efficiency For RFID systems, patch antennas are usually designed to have circular polarization and about 6 dBi to 8 dBi gain Figure 2-17 shows a patch antenna and Figure 2-18 shows a patch antenna array
Other Antenna Types
Tunnel antennas are used at many conveyor systems The antenna wraps around the conveyor and allows the reader s energy field to be uniformly radiated inside the tunnel This allows tags to be read regardless of their orientation or position A tunnel antenna placed over a conveyor with metal rollers creates a challenging situation for the reader to couple with the tags Therefore, during the design of the tunnel an-
FIGURE 217
Patch antenna
MIKE MEYERS COMPTIA RFID+ CERTIFICATION PASSPORT
FIGURE 218
Patch antenna array
tenna, special consideration is necessary to prevent the absorption and distortion of the magnetic and radio field energy Figure 2-19 shows a tunnel antenna
FIGURE 219
Tunnel antenna
CHAPTER 2 The RF in RFID
Loop antenna consists of a conducting coil leading from one conductor of a two-wire transmission line to the other conductor The principal lobe of the radiation pattern is wide and is in the direction perpendicular to the plane of the loop A loop antenna is very directional and its gain is proportional to the loop diameter: the larger the diameter, the higher the gain
Cables and Connectors
Cables connecting the interrogator with antennas are many times called transmission lines Some cables are permanently connected to the antenna at one end, while others have different types of connectors at both the ends Cables come in two different varieties One type of cable is a balanced twin conductor made up of two parallel conductors A second type of cable is a coaxial unbalanced line made of two coaxial conductors In RFID systems, all the cables used to connect antennas with the interrogator are coaxial type The coaxial cable, shown in Figure 2-20, consists of four parts: the inner conductor, which is either a solid or stranded wire; a surrounding dielectric material; the outer conductor made of braided strands or foil; and the outermost insulator jacket The outer conductor provides a shield against RF leakage from and to the cable The effectiveness of the shield depends on the quality and density of the braid At high frequencies, the braid must be tighter Coaxial cables come in various diameters, the higher the diameter, the lower the loss but the higher the cost Thicker cables are difficult to install and have a higher minimum bending radius The following table shows a few cable types and their attenuation per 100 feet cable length
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