Main criteria for key antenna design

AN3394

20/29

Doc ID 018754 Rev 5

A user interface allows to enter the antenna parameters which will be used to compute the

antenna coil inductance:

●

The number of turns

●

The number of segments

●

w: the conductor width in millimeters

●

s: the conductor spacing in millimeters

●

the conductor thickness in micrometers)

●

Length in millimeters

●

Width in millimeters

The number of turns is incremented each time a segment is added to a complete turn.

Figure 19 shows the user interface corresponding to the DEMO-CR95HF-A antenna and

Figure 20 the characteristics of the rectangular planar antenna etched on the DEMO-

CR95HF-A PCB.

includes the parasitic capacitance. Without the parasitic capacitance, the measured value of

Figure 19.

User interface for planar rectangular coil inductance calculation