GS-BT2416C1.H
Application information
6.1
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.)
Figure 3. Antenna on PCB
Figure 4. Antenna examples Figure 5. SMA connector for
external antenna
uct(s) ● Despite of the type of antenna chosen, the connection between the RF out pin and the
rod antenna must be executed in such a way that the connection trace must be matched to
have characteristic impedance (Z0) of 50 Ω to get the maximum power transfer.
P ● Matching for 50 Ω is depending on the various factors, elements to be taken into
te consideration are:
le – Type of material, i.e. FR4
so – The electrical characteristics of the material, i.e. the εr, electric constant at
b 2.4 GHz
O – Mechanical dimensions of the PCB and traces, i.e. PCB thickness, trace/
- reference ground thickness, trace width, trace thickness.
t(s) – Just to give an example, using a 1 mm thick FR4 board, with an εr = 4.3 at
2.4 GHz, with Cu thickness of 41 µm, the resulted width of 50 Ω strip-line is
c 1.9 mm (Microstrip type calculation).
rodu Figure 6. Parameters for trace matching
te P Trace width
Trace thickness
bsole PCB
O ε thickness
r (Dielectric constant)
Reference ground
Tools for calculating the characteristic impedance, based on the physical and mechanical
characteristics of the PCB, can be easily found on the web.
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