Questions & Answers on Coupler

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What is a Directional Coupler?

Aug 14, 2018

A directional coupler is a 4-port device that is used to sample a small amount of input signal power for measurement purposes. As seen in the diagram below, Port 1 is the input port, port 2 is the out...read more

What is Directivity in a Coupler?

Couplers

Editorial Team

Aug 1, 2018

The Directivity in a coupler is the ratio between the input signal at the coupled port and the unwanted reflected signal at the coupled port. It is a measure of how well the coupler isolates two ...read more

What is a Dual Directional Coupler?

Couplers

Editorial Team

Feb 20, 2017

A regular directional coupler is a 4 port network, similar to what is seen in the diagram below. Port 1 is the input port, port 2 is the output port, port 3 is the coupled port and port 4 is the isola...read more

What is Coupling Factor or Coupling Ratio?

Couplers

Editorial Team

Aug 29, 2018

The Coupling factor/Coupling Ratio is the ratio of incident power to the coupled power, measured in dB.So when we say a coupler has a coupling value of 3 dB, it means that 50% of the power is coupled ...read more

What is a Rat-Race Coupler?

Couplers

Editorial Team

May 22, 2019

A Rat-Race Coupler is a type of RF coupler that is manufactured using microstrips in the shape of a ring/circle. It is a four-port coupler, with each port placed at a distance of one-quarter wavelengt...read more

What is a Bi-Directional Coupler?

Couplers

Editorial Team

Mar 17, 2017

A bi-directional coupler is a type of RF coupler where the input and output ports are interchangeable. When port 1 is the input port, it works like a regular directional coupler. Port 1 is the input p...read more

What are Quadrature Hybrids?

Couplers

Editorial Team

Feb 21, 2019

Quadrature Hybrid is another name for a 90° Hybrid Coupler. They are four port devices that split an input signal equally between two output ports with a 90 degree phase difference between them. A...read more

What is the Difference between a 3-Port Coupler and 4-Port Coupler?

Couplers

Editorial Team

Jan 10, 2019

A directional coupler is usually a 4-port device with an Input Power, Coupled Port, Output Port and Isolated Port. In a 3-Port Coupler, the isolated port is terminated internally. The performance (dir...read more

What is a Branchline Coupler?

Couplers

Editorial Team

Jan 12, 2024

A Branchline Coupler is a four-port passive directional coupler that splits an input signal in to two parts by amplitude while providing a phase shift of 90˚ between the two output ports. ...read more

Lange Couplers and Their Use in RF/Microwave System Design

Couplers

Semigen

The Lange Coupler was developed by Dr. Julius Lange of Texas Instruments in 1969, while his group was engineering microwave amplifiers on thin film ceramic substrates. The team employed a Bell Labs ap...read more

Apr 24, 2023

Maximum Coupling Loss (MCL) is a term used in wireless communication to measure the maximum loss of signal power between two antennas that can still establish a reliable connection. It is defined as t...read more

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