SMA Coax Low-Loss 50 ohm Antenna Cables
The SMA connector (Sub Miniature Version A) was developed back in the 1960's. Today, it is commonly used in the computer world on wireless access points, connecting them to 50 ohm antennas.

SMA connectors come in a variety of flavors. Here is a brief list:

SMA Male
SMA Female
SMA(RP) Male - Reverse Polarity
SMA(RP) Female - Reverse Polarity
SMA Male - Right Angle

An SMA male connector has a male center pin and a male outer shell. An SMA Male-Reverse Polarity connector, has a FEMALE center pin and a MALE outer shell. It can get a bit confusing when trying to determine exactly which one you need. See the pictures for a better understanding.

SMA Male Connector
SMA-PR (Reverse Polarity) Male Connector
SMA Male Right Angle Connector
SMA Female Connector
SMA-RP (Reverse Polarity) Female Connector

Some manufacturers which use SMA connections on some of their Wireless access point products are:

3com
Belkin
Blitzz
Clarion
Compaq
D-Link
Intel
Linksys
Motorola
Samsung
Siemens
SMC
US. Robotics

TNC Coax Low-Loss 50 ohm Antenna Cables
The TNC Connector (Threaded Neill-Concelman) was developed in the early 1950's. It has been used in a variety of radio and wired applications over the years. Most recently, it too has been used in the computer world on wireless access points, connecting them to 50 ohm antennas.

The most common configurations of TNC connectors are as follows:

TNC Male
TNC Female
TNC (RP) Male - Reverse Polarity
TNC (RP) Female - Reverse Polarity

Much like SMA connectors, TNC reverse polarity connectors have a female center pin inserted into a male outer shell, and a male pin inserted into a female outer shell. Please see pictures below.

TNC Male Connector
TNC-PR (Reverse Polarity) Male Connector
TNC Female Connector
TNC-RP (Reverse Polarity) Female Connector

Some manufacturers which use SMA connections on some of their Wireless access point products are:

Alvarion
Breezecom
Cisco
EnGenius
Linksys
Orinoco
Proxim
SonicWALL
Wi-LAN

BNC Coax Low-Loss 50 ohm Antenna Cables
The BNC connector (Bayonet Mount locking Mechanism) has been used for years in a variety of applications on both video equipment and radio antenna connections. BNC connectors can be used in 75ohm professional video environments as well as 50ohm radio communication environments. RCA connectors are usually substituted for BNC connectors on consumer electronics. The TNC connector seen above is a threaded version of the BNC connector and generally has better performance in microwave frequencies.

BNC Male Connector
BNC Female Connector

N-Type Coax Low-Loss 50 ohm Antenna Cables
The N-Type connector was developed back in the 1940's for carrying microwave frequency signals used in military applications. Some of its current uses are in the cable TV industry as well as in the computer industry as antenna cables.

N-Type Male Connector
N-Type Female Connector

Some manufacturers which use SMA connections on some of their Wireless access point products are:

EnGenius
Wi-LAN