Miniaturized low-insertion-loss broadband balun based on IPD

Abstract

The invention discloses a miniaturized low-insertion-loss broadband balun based on an IPD. An unbalanced signal is fed into the first microstrip coupling line through the input port P1, and a radio frequency signal is coupled to the second microstrip coupling line and the third microstrip coupling line through the first microstrip coupling line. As the signals are transmitted by half wavelength more than the output port P3 from the input to the output port P2, the output signals of the signals are equal in amplitude and opposite in phase. Therefore, a 180-degree phase difference is realized between the output ports, and an unbalanced signal is converted into a balanced signal. According to the invention, on the basis of a traditional Marchand balun, coupling is enhanced by adopting a spiral cross coupling structure, and the working bandwidth of the balun is improved. On the other hand, the micro-strip balun is miniaturized through the IPD process design, and low insertion loss and good balance of output signals are achieved through optimization.

Description

technical field [0001] The invention belongs to the technical field of microwave integrated passive devices, and is an IPD-based miniaturized low insertion loss broadband balun. Background technique [0002] A balun is a microwave device that converts an unbalanced signal into a balanced signal. It is widely used in radio frequency microwave circuits, and there are many types, such as transformer baluns, microstrip baluns, and coaxial baluns. Among them, the microstrip balun is flexible in design and easy to integrate with microwave circuits, and has been extensively studied. The most typical microstrip balun is the Marchand balun, which uses coupled lines in various forms. At present, the microstrip Marchand balun generally has the following problems: First, as the circuit design further tends to be miniaturized, the requirements for the miniaturization of the balun are getting higher and higher. secondly, the frequency band designed by the traditional Marchand balun is n...

AI Technical Summary

Problems solved by technology

At present, the microstrip Marchand balun generally has the following problems: First, as the circuit design further tends to be miniaturized, the requirements for the miniaturization of the balun are getting higher and higher. secondly, the frequency band designed by the traditional Marchand balun is not wide enough to meet some broadband application scenarios

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