Table of Contents
Advertisement
25.
Antenna Considerations
CC
1020
ca
n be used together with variou
types of antenn
as. Th
antennas for short-range communication
a
re monop
ole
, helical and loo
Monopole
antennas
antennas with a length corresponding to
one quarter of the electrical wavelength
(λ
/4). The
y are v
ery ea
ca
n be im
pleme
nted simp
wi
re" or ev
en integrated onto the PCB.
No
n-reson
ant m
onopole a
than λ/4 can also be used, but at the
expense of range. In size and cost critical
a
pplications such an antenna may very
well be integrated onto the PCB.
Helical antennas can be thou
co
mbinatio
n of a monopole an
an
tenna. T
hey ar
e a goo
size
critical
applications
a
ntennas
ten
d to be mo
optimize than the simple monopole.
Loop
anten
nas a
re easy to integrate i
the PCB, but a
re less
26.
Configuration Registers
The co
nfiguration of
programming
the
registers. The configuration data based on
selected system parameters are most
easily found by using the SmartRF
software. Complete descriptions of the
registers are given in the following tables.
After a RESET is programmed, all the
registers have default values. The TEST
registers also get default values after a
s
e most
com
mo
n
p a
nte
nnas.
are
resonant
sy to d
es
ign an
d
ly as a "piece
of
ntenna shorte
s
r
ght of
as a
d
a loo
p
d comp mise i
ro
n
.
Bu
t
helic
al
re difficult t
o
nto
effective due t
o
CC1020
is done by
8-bit
configuration
®
Studio
SWRS046B
difficult impedance
matching because of
their very low radiation re
wer applications the λ/4-
For low po
monopole antenna is recommended due
to its simplicity as well as providing the
best range.
λ
The length of the /4-monop
given by:
L = 7125 / f
where f is in MHz, giving the length in cm.
An antenna for 868 MHz should be 8.2
cm, and 16.4 cm for 433 MHz.
The antenna should be connected
close a
s possible to the IC. If the antenna
is located away from the input pin the
antenna should be matched to the feeding
transmission line (50 Ω).
For a more thorough background
antennas, please refer to Application No
AN003 SRD Antennas available from the
TI web site.
RESET, and should not be altered by the
user.
TI recommends using the register settings
found
using
the
software. These are the register settings
that TI can guarantee across temperature,
voltage and process. Please check the TI
web site for regularly updates to the
®
SmartRF
Studio software.
CC1020
sistance.
ole antenna is
as
on
te
®
SmartRF
Studio
Page 65 of 91
Advertisement
Table of Contents
