iCLASS SE Reader Module Hardware Developer’s Guide, SE3200-902, Rev. C.1
February 2014 Page 28 of 52
Realize a simple tuning network by using two capacitors, one serial and one parallel.
Figure 9: Basic Antenna Tuning Network
Za Antenna impedance
Cs Serial Capacitor
Cp Parallel Capacitor
Rp Parallel damping resistor for Q-factor control
Ra Serial antenna resistance
La Antenna inductance
For the capacitors C0G or NP0, dielectrics with a voltage rating larger than 50 VDC
are recommended.
In practice, Cs and Cp may consist of several parallel capacitors to get better
granularity.
Be aware that HID is offering further documents, support and services in terms of
antenna design and support. These might require special or service level agreements.
Contact your sales manager for details about this offering.
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