Miniaturized low insertion loss broadband balun based on ipd

Abstract

The invention discloses a miniaturized low insertion loss broadband balun based on IPD. The unbalanced signal is fed into the first microstrip coupling line through the input port P1, and the radio frequency signal is respectively coupled to the second microstrip coupling line and the third microstrip coupling line through the first microstrip coupling line; since the signal goes from the input to the output port P2 It transmits half a wavelength more than the output port P3, and their output signals have the same amplitude and opposite phase. Therefore, the phase difference of 180° is realized between the output ports, and the unbalanced signal is converted into a balanced signal. On the basis of the traditional Marchand balun, the three-wire coupling of the invention adopts the structure of helical cross-coupling to strengthen the coupling and improve the working bandwidth of the balun. On the other hand, the miniaturization of the microstrip balun is achieved through the IPD process design, and low insertion loss and good balance of the output signal 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, coaxial baluns, etc. Among them, the design of microstrip balun is flexible and easy to integrate with microwave circuits, and has been widely studied. The most typical microstrip balun is the Marchand balun, which uses coupled lines in various forms. At present, microstrip Marchand baluns generally have the following problems: First, with the further miniaturization of circuit design, the requirements for the miniaturization of baluns are getting higher and higher. Marchand baluns are a kind of microstrip baluns, and they have large dimensions. Secondly...

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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