RK-WI.232FHSS-25-FCC-R datasheet(33/67 Pages) RADIOMETRIX

33 / 67 page

WI.232FHSS-25-R/ WI.232FHSS-250-R DATASHEET

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RF IN (dBm)

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High IIP3

Figure 14: Typical Analog RSSI response (Wi.232FHSS-25-R)

3.7. Antenna

The module is designed to work with any 50-ohm antenna, including PCB trace antennas.

We are often asked to recommend the best antenna to use with our modules. As a rule, either a ¼ wave

whip or ½ wave dipole antenna paired with a good, solid ground plane are good choices (Radiotronix part

numbers ANT 915-03A/ANT-915-02A for ¼ wave whip, SMA and RP-SMA, respectively and ANT-915-

09A/ANT-915-06A for ½ wave dipole, SMA and RP-SMA, respectively). If the application has a small

ground plane, the ½ wave dipole is a better choice. However, many embedded applications cannot

support an externally mounted antenna. If this is the case, a PCB antenna must be used. The designer

can either use an off-the-shelf PCB antenna, such as the Fractus FR05-S1-R-0-105, or design a trace

antenna.

Note: Antenna design is difficult and can severely impair the module’s performance if done incorrectly. As

such, we strongly encourage all of our customers to use off-the-shelf antennas whenever possible.

Alternatively, Radiotronix offers design services and can assist with your PCB layout.

3.8. Link Budget, Transmit Power, and Range Performance

A link budget is the best figure of merit for comparing wireless solutions and determining how they will

perform in the field.

In general, the solution with the best link budget will deliver the best line-of-sight range performance.

Improving the link budget by increasing the receiver sensitivity will result in lower power consumption while

improving the link budget by increasing the transmit power will result in more robust performance in the

presence of an on-channel interferer or multi-path interference.

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