Chapter 7

Tag Antennas

7.1 World to Tag, Tag to World

Tag antennas operate on the same principles as reader antennas, but face some very different practical challenges.

• Cost: the total cost, including IC, substrate, antenna, adhesive, die attach, and testing, must be less than US$1 for most applications, and for high-volume supply-chain applications the long-term goal is to reduce total tag cost to less than US$0.05. In contrast, a moderate-quality patch antenna for a reader application has a purchase price around US$150.

• Size: in supply chain applications tags must fit onto a 4-inch- (100 mm-) wide label. Since the natural resonant size, half a wavelength, is about 16 cm, many tag antennas must reduce their size. In addition, many applications ...

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