Non-foster matching of an RFID antenna - New Jersey Institute of ...
Non-foster matching of an RFID antenna - New Jersey Institute of ...
Non-foster matching of an RFID antenna - New Jersey Institute of ...
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12<br />
• Polarization <strong>of</strong> the reader <strong>an</strong>tenna<br />
• Type <strong>of</strong> application<br />
• Movement type/speed <strong>of</strong> the tagged object<br />
• Specific operating/environmental condition(s)<br />
• Reader <strong>an</strong>tenna polarization<br />
• Tag's readability<br />
A mis-tuned <strong>an</strong>tenna makes the tag perform<strong>an</strong>ce worse; therefore <strong>an</strong>tenna's<br />
frequency response should be very carefully considered.<br />
1.5 Imped<strong>an</strong>ce Matching Techniques<br />
The basic idea <strong>of</strong> imped<strong>an</strong>ce <strong>matching</strong> is to match output chip imped<strong>an</strong>ce to the input<br />
imped<strong>an</strong>ce <strong>of</strong> the <strong>an</strong>tenna to achieve maximum power tr<strong>an</strong>sfer. Imped<strong>an</strong>ce <strong>matching</strong> is<br />
import<strong>an</strong>t for the following reasons [7]:<br />
• Maximum power is delivered when the load is matched to the line (assuming the<br />
generator is matched), <strong>an</strong>d power loss in the feed line is minimized.<br />
• Imped<strong>an</strong>ce <strong>matching</strong> <strong>of</strong> sensitive receiver components (<strong>an</strong>tenna, low-noise<br />
amplifier, etc.) improves the signal-to-noise ratio <strong>of</strong> the system.<br />
• Imped<strong>an</strong>ce <strong>matching</strong> in a power distribution network (such as <strong>an</strong> <strong>an</strong>tenna array<br />
feed network) will reduce amplitude <strong>an</strong>d phase errors.<br />
1.5.1 BALUN<br />
Although imped<strong>an</strong>ce <strong>matching</strong> circuits [7] are used in <strong>matching</strong> source <strong>an</strong>d load<br />
imped<strong>an</strong>ces, due to size constrains we will only concentrate on baluns only.
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