CC2420Z-RTR1 datasheet(60/92 Pages) TI

60 / 92 page

CC2420

SWRS041B

Page 60 of 89

(

λ/4). They are very easy to design and

can be implemented simply as a “piece of

wire” or even integrated into the PCB.

The length of the

λ/4-monopole antenna is

given by:

L = 7125 / f

where f is in MHz, giving the length in cm.

An antenna for 2450 MHz should be 2.9

cm.

Non-resonant monopole antennas shorter

than

λ/4 can also be used, but at the

expense of range. In size and cost critical

applications such an antenna may very

well be integrated into the PCB.

Enclosing the antenna in high dielectric

constant material reduces the overall size

of the antenna. Many vendors offer such

antennas intended for PCB mounting.

Helical antennas can be thought of as a

combination of a monopole and a loop

antenna. They are a good compromise in

size critical applications. Helical antennas

tend to be more difficult to optimize than

the simple monopole.

Loop antennas are easy to integrate into

the PCB, but are less effective due to

difficult impedance matching because of

their very low radiation resistance.

For low power applications the differential

antenna is recommended giving the best

range and because of its simplicity.

The antenna should be connected as

close as possible to the IC. If the antenna

is located away from the RF pins the

antenna should be matched to the feeding

transmission line (50

Ω).

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