MCX, MMCX与SMP接头的区别详解
2017-04-18 01:26阅读：
MCX, MMCX, AND SMP WHICH ONE SHOULD I USE?
These three push-on connectors are similar and we will discuss the
advantages and disadvantages. All of them are 50 Ohm and can mount
to both semi rigid and flexible coaxial cables. The size of the
connector vary from manufacturer to manufacture; we include typical
sizes.
MCX
This is the largest of the three connectors with the right angle
male measuring typically 0.340 inches (8.63 mm) from the top to the
bottom.
It comes in right angle male cable mount, PCB mount
male and female plus circuit card edge, straight male, straight
female, and straight female bulkhead. Ther
e is a true 75-Ohm version, which is not compatible with the 50-Ohm
version discussed here.
ADVANTAGES
Cost- tends to be the least expensive of the three
connectors.
Locking mechanism-It is good, and for most manufacturers will
“snap” when positioned. In addition much of the connector body is
inserted into the mate giving more robust mechanical attachment.
This connector does not decouple easily.
Large center contact- 0.020in (0.508mm) typically. This
helps with multiple connects and disconnects. It is 77% larger area
than the other center contacts. It is hard to bend a MCX center
contact.
Frequency response- limited the connector will perform well to 6
GHz.
Cable choices- can be attached to most small and intermediate
cables 0.047 (1.20mm) to 0.2 (5.08mm) OD, which includes the
popular RG-316, RG-174, RG-400, RG-142, RG-223, 0.047 and 0.085
semi rigid.
DISADVANTAGES
Size- with a larger size the connector, it takes up more
space.
Limited Frequency- 6 GHz max.
Locking mechanism is manufacturer specific. Connectors from one
manufacturer don’t always mate well with other manufacturers. Some
manufactures have as little as 1.0 Lbs (0.45Kg) disengagement
force. The typical disengagement force is 2 Lbs (0.9kg).
MMCX
This connector measuring 0.275 in (7mm) from the top of the
connector to the mating surface. The center contact pin is
typically 0.016in (4mm) OD.
The MMCX is designed for the smaller cables. 0.047, 0.085 (2.1mm)
semi rigid and RG-316, RG-174 (0.10 OD in). The cutoff
frequency for the MMCX is usually about 6 GHz.
ADVANTAGES
Size -is the big factor, it is smaller in every aspect to
MCX.
Cost- is reasonable 20% more than the MMCX.
DISADVANTAGES
Locking mechanism- is not as robust as the MMCX or GPO. The
connector will snap in, but it tends to snap out just as easily.
The MMCX is better for lab environment. Some manufactures have a
minimum disengagement force of 1.4lbs. With that said the MMCX
mating surface does not go into the receptacle very deep (unlike
the MCX) so it is easy to snap out.
Frequency- limited to 6 GHz.
Cable Choices: Limited to 0.047 to .085 for the semi rigid and 0.1
in OD for the flex cables RG-316, RG-174.
SMP
The SMP was designed for the military missile market, where high
vibration and high frequency are important. The size is small
0.240in from top of connector to the bottom of the contact. The
center contact is 0.015in OD. The frequency range is typically
18GHz with some manufacturers going to 40GHz. Many different
flavors of this connector exist, from bulkheads to board
mount.
ADVANTAGES
Locking Mechanism: The SMP comes in three flavors: full detent that
means it takes about 15 pounds to disengage, partial detent 10
pounds, and smooth bore 2 pounds for disengagement. Good for high
vibration environment. The full detent is very difficult to
disengage it will not just snap out.
High frequency- performance good to 18-40 GHz depending on
manufacturer.
Size- Smallest in size
Military sales guide this connector. Even the commercial connectors
are of very high quality since most of the manufacturers sell to
the military.
DISADVANTAGES
Cost: The SMP can cost three times the MCX.
Cable choices: Limited to 0.047 to .085 for the semi rigid and 0.1
OD for the flex cables RG-316, RG-174.
Center pin- is small so frequent disconnects will damage and bend
pins.
WHO MAKES THE BEST CONNECTORS?
The answer is simple-- they all do. What I mean to say is, if you
want low cost there is a group of suppliers, if you want
performance there is another group. There is no free lunch, one
supplier does not offer low cost and high quality. You get what you
paid for. One manufacturer uses much thicker gold plating tighter
tolerances and their performance is better. Another has wide
tolerances and their cost is very low. Select based on your system
performance vs. the cost the connector.
原文链接
http://onlinecables-com.blogspot.com/2011/10/mcx-mmcx-and-smp-which-one-should-i-use.html
