it-iQ
Facebook Twitter LinkedIn

RF Antennas and Connectors

There is a huge selection of antennas and connectors available. For the antennas, broadly there are two categories; directional and omni-directional.

Directional antennas are used in fixed locations and allow for a concentrated signal between sender and receiver. This is most often used if two locations need to connect to each other and no other locations are part of this connection. For instance a connection between an office and a Telco tower. The directional antenna allows for the signal to concentrate between these two points so that all signal is used to transmit the information. This means that less power is needed or a longer distance can be bridged. This is also often used to build a WiFi bridge between two locations to connect two separate networks together.

Omni Directional antennas are used for mobile installations, often vehicles or vessels.  Mobile phones also have omni-directional antennas. This is convenient when there is good signal and / or more locations that need connecting to.  Like driving on the motorway going from mobile phone cel site to cel site. The phone just keeps being connected to the strongest tower.

Examples of directional antennas are:

Examples of omni-directional antennas are:

Coax Cable

Antennas connect to equipment using Coax cable. This allows for the signal to travel from the equipment to the antenna with little signal loss so that most of the signal is emitted through the antenna to the other side. Generally, the longer the cable run, the better quality the coax needs to be to have the least amount of loss. Also the environment where the coax is used dictates what type of coax can be used. ie, gel filled, low smoke when burned etc.

Typical Coax construction

Connectors:

To connect the Coax cable to the antenna or equipment, Coax connectors are used. There is a large variety of these depending on the frequency used for sending the signal. In the WiFi and mobile broadband frequencies, the most common ones are N-Type

and SMA

TNC,

as well as FME.

For smaller equipment like USB sticks and thelikes, SMA, SSMB, and others are used.

Often little pig tails are used to convert from one type to another. For instance when a cable with an N-Type connector needs to connect to SSMB socket, a small convertor cable is used, also because this is more flexible than the often fatter N-Type cable.

Adaptors:

Adaptors are smaller and used to convert from one type to another or from male to female or the other way around. like this one

that can connect two female cables together. There are converors for nearly every type of connector to every type of connector.

There are lots more:

please do not hesitate to contact us to discuss your requirements.

IT Matters