Hardware Development Guide of Module Product
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59
MF206A
restricted by the height, a circuit is required between them for transition. During the design of transit
circuits on the mainboard, the natural impedance of the microstrip line or stripline between the RF port of
the module and the RF port on the mainboard connected to the antenna is designed to be 50 ohm, and a
dual-L matching circuit is reserved, as shown in Figure 5-6. Use a zero-ohm resistor on the cascading
position between them.
2. If the RF connector used by the RF cable can be directly connected to the RF terminal on the module,
and the height falls within the limited range, the circuit transition between the RF port on the module and
the antenna interface can be saved, and the RF connected used by the RF cable of the antenna can be
directly connected to the RF terminal of the module.
Figure 5–6 Transition Circuit
Microstrip line or
stripline with a
natural impedance of
50 ohm
Microstrip line or
stripline with a
natural impedance of
50 ohm
Dual-L matching
network
RF coaxial cable of
the antenna
RF interface on the
antenna RF cable
and RF interface on
the mainboard
RF interface on
the module
Antenna
5.3.5
Type of Antenna RF Cable & RF Connector
The antenna RF connection cable usually adopts GBE(TW) and Shenyu (Mainland), or Japanese Somitomo and
Shin Din. The antenna RF cable usually adopts a line width of 1.37mm. The antenna RF connector usually
adopts Japanese IPX, or HRS, while the price of the latter is higher.