GS-BT2416C2 datasheet(9/32 Pages) STMICROELECTRONICS

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GS-BT2416C2.AT1

Application information

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5.1

Antenna reference

RF output pin must be connected to an antenna which could be:

●

Antenna directly printed on the pcb (Figure 3)

●

Integrated antenna as, for example, Antenova 30-30-A5839-01 , Murata

ANCV12G44SAA127, Pulse W3008 , Yageo CAN4311153002451K. (Figure 4)

●

External antenna connected by means a SMA connector (Figure 5)

●

Despite of the type of antenna chosen, the connection between the RF out pin and the

antenna must be executed in such a way that the connection trace must be matched to

have characteristic impedance (Z0) of 50 ohm to get the maximum power transfer

●

Matching for 50ohm is depending on the various factors , elements to be taken into

consideration are:

–

Type of material, i.e. FR4

–

The electrical characteristics of the material ,i.e. the

εr , electric constant at

2.4GHz

–

Mechanical dimensions of the pcb and traces ,i.e. pcb thickness , trace/ reference

ground thickness, trace width , trace thickness

–

Just to give an example , using a 1mm thick FR4 board , with an

εr = 4.3 at

2.4GHz , with Cu thickness of 41

µm, the resulted width of 50ohm strip-line is 1.9

mm ( Microstrip type calculation).

Figure 6.

Parameters for trace matching

Tools for calculating the characteristic impedance, based on the physical and mechanical

characteristics of the pcb , can be easily found on the web.

Figure 3.

Antenna on PCB

Figure 4.

Antenna examples

Figure 5.

SMA connector for

external antenna

εr (Dielectric constant)

PCB

thickness

Trace width

Reference ground

Trace thickness

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