What is OMT for outdoor (ODU) in microwave hardware installation?

The orthogonal mode transducer (OMT) is the short name for the polarized hybrid coupler. The OMT is used when two ODUs with different polarization directions need to be installed on the same antenna.

What is hybrid coupler for outdoor (ODU) in microwave hardware?

What are ODU (Outdoor Unit) functions in Digital Microwave Link?

Interfaces of the OMT

Functions and Features

The OMT separates V polarization from H polarization for RF signals.

• In the transmit direction, the OMT combines two ODU RF signals into one RF signal which is then transmitted to the antenna.
• In the receive direction, the OMT divides the RF signal received from the antenna into two RF signals which are then transmitted to the ODUs.

Working Principle

The OMT performs conversion between a rectangular waveguide cavity and a round waveguide cavity for dual-polarized waves, and combines/separates V-polarized waves and H-polarized waves with/from each other.

• In the transmit direction, the OMT performs conversion between a rectangular waveguide cavity and a round waveguide cavity, so that V/H-polarized waves separately from two rectangular waveguide cavities can be transmitted in the round waveguide cavity and then sent to free space by means of an antenna with a round waveguide interface.
• In the receive direction, the OMT receives V/H-polarized waves from the round waveguide interface of an antenna, separates V-polarized waves from H-polarized waves, and transmits the separated waves to appropriate rectangular waveguide cavities.

Interfaces

The OMT has three types of interfaces: antenna interface, V-polarized ODU interface, and Hpolarized ODU interface.

• The antenna interface of the OMT is a round recessed waveguide interface.
• The ODU interface of the OMT is a rectangular protruding waveguide interface.