Directional Couplers

8-way .02-3 GHz Ultra-Broadband Ferrite Power Divider TRM

Couplers

TRM Directional Coupler Application Note / Selection Guide

TRM builds three and four port directional couplers and dual directional couplers using lumped element, airline, or stripline technology.

We also offer a complete range of units designed to satisfy the requirements of military and space markets.

Component packages: Pin, Surface Mount, and Connectorized.

ROHS upon request

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603.627.6000 or email
info@trmmicrowave.com

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Couplers

	Frequency Range	Coupling	Download Application Guide
Broadband	.1 - 2000MHz	16dB - 30dB
Dual Directional	.225 - 4 GHz	10dB - 30dB
Flatpack	5 - 1000 MHz	6dB - 20.3dB
Multi-Octave Broadband	5 - 24 GHz	6dB - 20 dB
Octave Broadband	.125 - 18 GHz	6dB - 30dB

Operational Description

A directional coupler is a functional four-port network, although one of the ports may be internally terminated. Directionality is dependent on internal symmetries and matching. For each of the four ports of the coupler, one of the other ports is isolated at another port, energy is coupled from the referenced port and the balance of the energy (after coupling losses) exits the remaining port called the "mainline" or "low-loss" port. A directional coupler, as its name implies, samples signal energy based on the direction of energy flow.

Coupler Parameters

Coupling

The relative signal attentuation between an input port and its corresponding coupled port.

Coupling Loss

The remainder of the input power left after accounting for coupled power and power transmitted to the isolated port.

Main Line Loss

The total insertion loss in the main line as measured in a matched system. The main line loss includes coupling losses, reflection losses and dissipation losses.

Coupling Tolerance

The tolerance of the average value of the coupling in dB over a specified frequency range.

Coupling Variation

The peak-to-peak variation of coupling in dB about the average value over the frequency range.

Directivity

The ratio of the power (in dB) measured at the coupled port when a signal is applied in the forward direction (input to output) verses the reverse direction (output to input).