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Antenna Layout Considerations
Most compact wireless designs require a small antenna. Loop antennas are often used as they can be designed into small spaces. The design of
loop antennas is a fairly lengthy and detailed discussion which is beyond the scope of this datasheet. The object here is to provide a “ rule of thumb ”
approach to achieve an appropriate starting point. Empirical data will provide the best path to take.
The circumference of the antenna should be less than λ /4 so that the antenna appears inductive. For this, a series matching capacitor is used to
tune out the inductance of the antenna, since the antenna appears inductive. The capacitor may be located at the feed point of the antenna or at the
“ grounded ” end. The capacitor may be a variable type or several fixed values may be attempted until an optimal match is reached. The use of a
good network analyzer is essential for proper matching and maximum power transfer. For additional information on antenna design see the
Application Notes section of our website: http://www.rfm.com/corp/apnotes.htm .
Typical Test Circuit
www.RFM.com Email: info@rfm.com
?RF Monolithics, Inc.
Page 10 of 11
TXC100 - 08/18/10
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