Data Sheet

UBX-18017567 - R07 Appendix Page 37 of 46
C1 - Public
Item Requirements Remarks
Isolation
(in-band)
S
21
> 25 dB recommended
S
21
> 20 dB acceptable
The antenna to antenna isolation is the
S
21
parameter between the two
antennas in the band of operation.
Isolation
(out-of-band)
S
21
> 35 dB recommended
S
21
> 30 dB acceptable
Out-of-band isolation is evaluated in the
band of the aggressor to ensure that
the transmitting signal from the other
radio is sufficiently attenuated by the
receiving antenna to avoid saturation
and intermodulation effect at the
receiver’s port.
Envelope
correlation
Coefficient
(ECC)
ECC < 0.1 recommended
ECC < 0.5 acceptable
The ECC parameter correlates the far
field parameters between antennas in
the same system. A low ECC parameter
is fundamental to improve performance
in MIMO-based systems.
Table 36: Summary of MIMO and Wi-Fi/Bluetooth coexistence requirements. MIMO is not applicable for JODY-W2.
A.1.3 Reference design of RF path
JODY-W2 is certified with a set-up including JODY-W2 module board with it’s RF paths connected to
the carrier board with RF coaxial cables. The antennas are connected to the carrier board through
SMA connectors. Below are the relevant components listed.
 Module board including U.FL connectors with JODY-W2 mounted.
 Carrier board including U.FL connectors to interface the module board and SMA connectors
to connect antennas.
 Coaxial cables with U.FL connectors connecting the module board’s RF traces to the carrier
board’s RF traces.
 Antennas connected to the carrier board’s SMA connectors.
Figure 15. Definition of Module board and Carrier board