Balanced type frequency tripler of substrate integrated waveguide (SIW)

Abstract

The invention provides a balanced type frequency tripler structure of a substrate integrated waveguide (SIW). An SIW bridge is used at the output end of a balanced type frequency tripler, and a proper SIW width is selected to stop a base band and a secondary harmonic, thereby ensuring that the energies of the basic wave and the secondary harmonic can be reflected back to a field effective tube for reusing without adding any harmonic reflection unexpected difficulties; the guided wave length of the SIW bridge is properly adjusted, so that the base band and the secondary harmonic can be inhibited to reach a requirement, and the harmonic inhibiting index can be met without the addition of a harmonic inhibiting filter at the output end. The balanced type frequency tripler based on the design thought has the advantages of high efficiency of frequency multiplication, simple structure, low technological requirement and is applicable to high-frequency section.

Description

technical field [0001] The invention belongs to the technical field of microwave communication, and relates to a balanced frequency tripler structure of a substrate integrated waveguide (SIW). Background technique [0002] The frequency multiplier is a device used to multiply the fundamental frequency to the required harmonic frequency so that it can output the required harmonic power. [0003] figure 1 is the topology of a traditional single-terminal frequency multiplier, which includes active devices, matching and reflection branches. The design of field effect transistor (FET) frequency multiplier is mainly focused on three aspects: first, the extraction of the nonlinear model of the active frequency doubler device; second, the state of the device itself. That is to find a suitable harmonic generation state to make the active device generate the maximum required harmonics; the third is the design of the circuit network. That is to design a suitable input and output net...

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Problems solved by technology

But the traditional balanced tripler also has its inherent disadvantages, namely; (1) a bridge with a bandwidth of three octaves is extremely difficult to realize, so the theory mentioned in the previous paragraph is extremely difficult to realize

It is generally necessary to apply other methods to suppress the fundamental and second harmonics; (2) The commonly used parallel open-circuit microstrip lines (fundamental and second harmonic reflection stubs) increase circuit complexity and affect the tube Its own matching characteristics; (3) In addition, it is necessary to add a band-pass filter or a high-pass filter at the output end to suppress the fundamental frequency and the second harmonic to ensure that the output harmonic suppression and fundamental wave suppression meet the requirements

This undoubtedly increases the complexity of the circuit and the difficulty of implementation, and reduces the gain and output power

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