The basic directional coupler is a four-port junction in microwave systems that cover the reflected microwave power accurately with minimal disturbance to the transmission line. These directional couplers are useful in all the power transmission equipment where there is loss of power, which the coupler controls.

There are various directional couplers depending on their usage requirements. The different types of directional couplers are single directional coupler, dual directional coupler, coaxial air-line directional coupler and custom made directional coupler, classified as per the directional coupler design.

Some important parameters you must consider before you buy directional couplers are

1. The type of application and size of the cable for which you require the directional couplers
2. The frequency and the power being transmitted
3. The type of directional coupler that you require

Action Steps
The best contacts and resources to help you get it done

Evaluate online tutorials on directional couplers

To obtain training on the subject of directional couplers get hold of specified tutorials on directional couplers from various writers on the subject.

I recommend: You can read the hybrid coupler tutorial and basics at RF Café. You can also refer to the RF directional coupler tutorial at Radio-Electronics.Com. You can encourage employees to visit Penton Media for their directional coupler tutorial.

Buy directional couplers from reliable manufacturers

Once you understand your requirements for directional couplers, you can go to a specific manufacturer to buy them.

I recommend: MECA Electronics is a reputable manufacturer that sells directional couplers with a range of directional coupler power from 50 watts to 500 watts. Agilent is another reputable manufacturer that sells directional couplers including a dual directional coupler. You can buy a uni-directional and bi directional coupler from MITEQ, another reputable manufacturer of a range of directional couplers.

Buy directional couplers from distributors

You can compare different directional couplers based on the features and prices at distributors or retailers' websites. You can ask for discount if you are buying in bulk.

I recommend: Check out different types of directional couplers at Tech-Systems Electronics, a reputable distributor of industrial electronic test equipment. If you are looking for a coaxial dual directional coupler and a coaxial directional coupler, you can buy it from TRS-RenTelco, a distributor of a variety of directional couplers from different leading manufacturers including Agilent, Anritsu and Tektronix. ValueTronics International is another distributor that offers different types of refurbished directional couplers.

Tips & Tactics

Helpful advice for making the most of this Guide

• •  You should take proper care while selecting the directional coupler as a bad quality coupler will result in loss of power.
• •  Get the directional couplers checked regularly by experienced service providers.