Error! No text of specified style in document. - System Integration Manual
CDMA-2X-11004-P1
Objective Specification
Design-In
Page 62 of 79
74.2
Antenna guidelines
Antenna characteristics are essential for good functionality of the module. Antenna radiating
performance has direct impact on the reliability of connections over the Air Interface. A bad
termination of ANT can result in poor performance of the module.
The following parameters should be checked:
Item
Recommendations
Impedance
50
Ω
nominal characteristic impedance
Frequency Range
Depends on the Error! No text of specified style in document. module HW version and on
the Mobile Network used.
LISA-C200:
- Cell Band B0: 824..894 MHz
- PCS Band B1 B2: 1850..1990 MHz
Input Power >2
W
peak
V.S.W.R
<2:1 recommended, <3:1 acceptable
Return Loss
S
11
<-10 dB recommended, S
11
<-6 dB acceptable
Gain <3
dBi
Table 18: General recommendation for CDMA antenna
To preserve the original u-blox FCC ID, antenna gain shall remain below
Cell Band 2 dBi, PCS Band 3
dBi
CDMA antennas are typically available as:
Linear monopole: typical for fixed applications. The antenna extends mostly as a linear element
with a dimension comparable to lambda/4 of the lowest frequency of the operating band.
Magnetic base may be available. Cable or direct RF connectors are common options. The
integration normally requires the fulfillment of some minimum guidelines suggested by antenna
manufacturer
Patch-like antenna: better suited for integration in compact designs (e.g. mobile phone). These
are mostly custom designs where the exact definition of the PCB and product mechanical
design is fundamental for tuning of antenna characteristics
For integration observe these recommendations:
Ensure 50
Ω
antenna termination by minimizing the V.S.W.R. or return loss, as this will optimize the
electrical performance of the module. See section 74.2.1
Select antenna with best radiating performance. See section 74.2.2
If a cable is used to connect the antenna radiating element to application board, select a
short cable with minimum insertion loss. The higher the additional insertion loss due to low quality
or long cable, the lower the connectivity
Follow the recommendations of the antenna manufacturer for correct installation and
deployment
Do not include antenna within closed metal case
Do not place antenna in close vicinity to end user since the emitted radiation in human tissue is
limited by S.A.R. regulatory requirements
Do not use directivity antenna since the electromagnetic field radiation intensity is limited in
some countries
Take care of interaction between co-located RF systems since the RF transmitted power may
interact or disturb the performance of companion systems
