A Balanced-Unbalanced Coupler with Arbitrary Power Split Ratio

Abstract

The invention discloses a balanced-unbalanced coupler with an arbitrary power division ratio. The specific scheme includes: a balanced differential signal input port A, a balanced differential signal isolation port B, an unbalanced terminal signal coupling output port C, and an unbalanced terminal The signal passes directly through the output port D, six branch lines, four quarter wavelength impedance converters and phase compensation lines. In order to make the performance of the microstrip circuit system not be affected by the width of the high-impedance line, and to achieve a wide range of power distribution ratios, the balanced-unbalanced coupler with any power division ratio maintains good common-mode rejection characteristics, ideal input and output In the case of port impedance matching, a differential signal input is realized, which is divided into two unbalanced signal split output functions; and by changing the electrical length, any power division ratio can be realized and the circuit structure layout is more flexible.

Description

technical field [0001] The invention relates to a coupler, in particular to a balanced-unbalanced coupler with any power division ratio. Background technique [0002] Signal separation and combination are often required in antenna feed networks, balanced power amplifiers, and balanced mixers. Compared with the Wilkinson power divider and Gysel power divider, the branch line coupler overcomes the problem that the power capacity of the device is limited by the resistance because it does not introduce resistance. [0003] With the continuous development of modern wireless communication systems, the requirements for electromagnetic communication are getting higher and higher, especially in high-sensitivity networks, the impact of noise interference on the overall system performance cannot be ignored. Balanced differential circuits and devices can not only reduce common-mode signals, but also have strong anti-interference ability to noise, and have become an important part of co...

AI Technical Summary

Problems solved by technology

And for a system with both balanced ports and unbalanced ports, it is necessary to use a balanced-unbalanced coupler as a connecting element, but the power division ratio of the traditional coupler is realized by controlling the characteristic impedance of the microstrip line , when the power division is relatively large, there is a high-impedance microstrip line, and its physical realization is limited by processing, and the achievable power division ratio is limited

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