Branch-line coupler

Abstract

A branch-line coupler suitable for use in mobile devices includes a first, second, third, and fourth ports, respectively acting as input, transmitted, coupled, and isolated port. A first, second, third, and fourth connection parts are connected to the ports and transmission lines. First and second bent transmission lines are electrically connected between first and second ports. Third and fourth bent transmission lines are electrically connected between third and fourth ports. A first long strip transmission line is electrically connected between the first port and the fourth port. A second long strip transmission line is electrically connected between the second port and the third port. The branch-line coupler occupies a small area and has high performance.

Description

technical field [0001] The invention relates to a coupler, in particular to a 3dB branch line coupler. Background technique [0002] It is well known that in many microwave circuits, directional couplers are often used to solve the related problems caused by distributing power. With the development of mobile communication technology and satellite communication technology, in order to facilitate portability and mobility, the miniaturization of communication equipment is becoming more and more important. [0003] Branch line couplers are widely used in microwave integrated circuits and monolithic integrated circuits. Traditional branch line couplers, such as 3dB branch line couplers, are composed of four quarter-wavelength transmission lines, figure 1 It is a structural schematic diagram of a traditional 3dB branch line coupler, such as figure 1 The traditional drop line coupler shown is 7.4 millimeters (mm) long and 9.14 millimeters (mm) wide. However, conventional 3dB br...

AI Technical Summary

Problems solved by technology

However, traditional 3dB branch line couplers occupy a large circuit board (PCB) area

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