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This brings us to the four different ways of specifying antenna gain, shown with their meaning here:
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dBil dBdl
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Relative to isotropic antenna with linear polarization Relative to dipole antenna with linear polarization
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dBic Relative to isotropic antenna with circular polarization dBdc Relative to dipole antenna with circular polarization
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Remember that antennas with different polarization do not communicate and also do not interfere with each other
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Antenna Performance
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Antenna efficiency is the ratio of power actually radiated from the antenna to the power provided to the antenna terminals Radiation in an antenna is caused by radiation resistance, which can be measured only as a part of the total resistance, including the loss resistance The loss resistance usually results in heat generation rather than radiation, and therefore reduces efficiency Impedance of an antenna can be easily measured with specialized equipment Measuring the radiation pattern requires a sophisticated setup, including an anechoic chamber (to exclude radiation noise) designed for antenna measurements, precise placement of measuring equipment, and specialized equipment that rotates the antenna during the measurements All of the antenna parameters are expressed in terms of a transmission antenna but are identically applicable to a receiving antenna due to reciprocity The measurement of impedance at the load, where the power is consumed, is most critical For a transmitting antenna, the load is the antenna itself, while for a receiving antenna, the load is the receiver rather than the antenna The reading range of an RFID antenna depends on many variables: the antenna size, the tag size, the tag s orientation with respect to the transmitting antenna, the antenna location with respect to other materials, and the ambient electrical and magnetic noise within the band of interest The impedance of an antenna should match that of its connecting transmission line The polarization of an antenna should match with the tag orientation Antennas used for transmission have a maximum specified power rating, beyond which heating, arcing, or sparking may occur in the components, which
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CHAPTER 2 The RF in RFID
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may cause them to be damaged or destroyed This, of course, is a concern only for transmitting antennas; the power received by an antenna rarely exceeds the microwatt range
Types of Antennas
Following are brief descriptions of a few common antenna types found in many RFID systems
Isotropic Antenna
The isotropic radiator is a purely theoretical antenna that radiates equally in all directions It is considered to be a point in space with no dimensions and no mass This antenna cannot physically exist, but is useful as a theoretical model for comparison with all other antennas Most antennas gains are measured with reference to an isotropic radiator and are rated in dBi (decibels with respect to an isotropic radiator) An isotropic antenna s radiation pattern is spherical
Dipole and Monopole Antennas
The dipole antenna is simply two thin conductors (wires) pointed in opposite directions, arranged either horizontally or vertically, with one end of each conductor connected to the feed line and the other end hanging free in space Both the conductors usually have the same lengths, and their combined length determine the antenna s wavelength The two conductors are driven by a voltage applied to the feed line in the middle The ideal length for a dipole antenna tuned to 915 MHz is about 16 cm (65 inches) It is has a modest gain of 215 dBi Since this is the simplest practical antenna, it is also used as a reference model for other antennas When a dipole is used as a reference to calculate gain of an antenna, the gain of that antenna is expressed as dBd Variations of the dipole include folded dipole, half-wave antenna, and monopole Monopole is half the dipole Monopole antennas are vertical antennas erected on the ground, where the ground, being a conductive material, acts as a reflector, providing an image of the monopole and effectively creating the dipole Monopole antennas are used for radio transmission, but they are generally less efficient than equivalent dipole antennas Figure 2-15 shows dipole and monopole antennas Generally, the dipole has a toroidal (donut-shaped) radiation pattern, where the axis of the toroid is aligned with the axis of the dipole This pattern is shown on the left side of Figure 2-16 Most of the power transmitted by a dipole is in horizontal (H) plane with an omnidirectional pattern In the other two planes,
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