Comparing Small Form Factor Coaxial RF Connectors - Suntsu Electronics.pdf

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6/20/2021
Comparing Small Form Factor Coaxial RF Connectors - Suntsu Electronics
Comparing Small Form Factor Coaxial RF
Connectors
November 3, 2017
At Suntsu, one of our focus is in wireless communication. We’ve helped our
customers with cables focused on antenna-to-board connectivity. As we
mentioned in our prior articles, all of our customers are going compact and
smaller. U.FL is the established high frequency miniature coaxial
interconnection type. But it is proprietary to Hirose. So many manufacturers
offer 100% U.FL compatible connectors under various names such as IPEX, IPX,
MHF, AMC, UMCC, and MCRF.
Many of our customers have asked: Which small coaxial RF connector should I
use for my antenna cable? Is there a difference in U.FL, IPEX, or MMCX (Micro
miniature coaxial)?
Let’s look at a brief comparison of the connector types.  At rst glance, it appears U.FL/IPEX/IPX may have better performance than
MMCX because U.FL/IPEX/IPX are designed for lower VSWR at < 3GHz frequencies. However, this is just a connector level
comparison.  We need to go deeper than just connectors and consider are performance, robustness, and ease of use across the
connector, cable and end-point (antenna or otherwise).
Type
Standard
U.FL
Hirose proprietary
IPEX/IPX
Designed to be U.FL
Compatible
Many
=<1.30 (Up to 3GHz)
1.30 – 1.50 (3 – 6GHz)
2.5mm Max mating height
3.0mm diameter plug
MMCX
CECC 22220
Manufacturers
VSWR
Hirose
=<1.30 (Up to 3GHz)
1.30 – 1.50 (3 – 6GHz)
2.5mm Max mating height
3.0mm diameter plug
Many
=<1.50 (Up to 6GHz)
Size/footprint
Height varies with
jack/plug combination.
2.4mm diameter plug
 
Orientation
Contact Retention
Right angle only
Good: 0.15N to 4N/
0.03lbs to 0.9lbs
N/A
Right angle only
Good: 2N to 4N/
0.45lbs to 0.9lbs
=< 4N/8.6lbs
Straight or right angle
Strong:  ? 10N/2.3lbs
Engagement Force
 
Disengagement Force
=< 35.6N/8.6lbs
N/A
Initial: =< 5N /1.12lbs
30 cycles: ? 3N/0.67lbs
30 cycles
Yes
6N to 15N/1.4lbs to
3.4lbs
500 cycles
No
Mating cycles
Removal Tool Needed
 
30 cycles
Yes
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Performance
The table considers just the connector alone.  It is more important to compare performance in an entire antenna/cable assembly.
 Different combinations of connectors, cable types, and cable lengths will affect system performance, and designers should focus on
the VSWR specs of the entire assembly.
Examples of VSWR value (lower is better):
1)      IPEX connector: =<1.30
2)      MMCX connector: =<1.50
3)      SMA connector: =<1.50
4)      IPEX to MMCX with 50mm cable: =< 2.00 (whole assembly)
5)      MMCX to SMA with 200mm cable: =< 2.00 (whole assembly)
When looking at the end-to-end signal path of antenna and cable assembly, there likely will be little difference in performance between
connector types, unless the application requires very stringent tolerances. Around 20% of Nexsun’s customers fall into the stringent
category, for which we have done specialized designs.  However, for the other 80%, we consider a different set of decision criteria:
Robustness: 
MMCX is the better choice. MMCX has much higher contact retention than U.FL/IPEX/IPX and requires greater force to disengage, so
will better withstand jostling and vibration. Designed for 500 mating cycles, MMCX will last longer than U.FL/IPEX/IPX, if the
connection needs to be regularly disconnected and re-connected.
Ease of Use
Generally, U.FL/IPEX/IPX is the better choice when space is at a premium in the design, but MMCX will be easier to use from an end
user maintenance point of view.  Here are detailed considerations:
Mating pro le: U.FL/IPEX/IPX will have a smaller pro le than MMCX – the difference being a 2.5mm maximum height when
mated versus 6.0mm minimum height with MMCX.
Deployability:   MMCX offers more con guration options for plug and receptacle, with straight and right angle options, while
U.FL/IPEX/IPX are available only in a straight vertical receptacle and right angle plug.
Serviceability:   When deployed in the eld, U.FL/IPEX/IPX connections require a special tool for extraction, to avoid damage to
the connectors. Servicing MMCX connections does not require any special tools.
Footprint:   U.FL/IPEX/IPX and MMCX all have similar footprints of 3 – 4 square mm.   Beyond the connector, designers should
consider the spacing for the right angle inserted cables and cable management.
 
Suntsu has cultivated a select group of suppliers for RF Connector products:
For common coaxial RF connectors such as BNC, TNC, F-Type, SMA, and SMB, Suntsu offers products from Amtek Technology.
For standard miniature RF connectors and antennas (SMA, RP-SMA, MMCX, IPX), Suntsu offers products from Master Wave
Technology.
For customers who need customized miniature RF connectors and cable assemblies designed for wireless applications, Suntsu
offers Suntsu products.
If you want suggestions for your RF system design, give Suntsu Electronics a call at +1.949.783.7300
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