Stacked type three-order substrate integrated waveguide filter

Abstract

The invention discloses a stacked type three-order substrate integrated waveguide filter. The stacked type three-order substrate integrated waveguide filter comprises a top surface metal layer, a first dielectric substrate, a first middle metal layer, a second dielectric substrate, a second middle metal layer, a third dielectric substrate and a bottom surface metal layer which are stacked and distributed in sequence, wherein a first resonant cavity, a second resonant cavity and a third resonant cavity are formed in the first dielectric substrate, the second dielectric substrate and the third dielectric substrate respectively; an input port is formed in the top surface metal layer; an output port is formed in the bottom surface metal layer; the first middle metal layer is used for adjusting the magnetic coupling coefficient between the first resonant cavity and the second resonant cavity to obtain a first transmission zero point; and the second middle metal layer is used for adjusting the magnetic coupling coefficient between the second resonant cavity and the third resonant cavity to obtain a second transmission zero point. The stacked type three-order substrate integrated waveguide filter provided by the invention, by adjusting the electromagnetic coupling strength and obtaining extra transmission zero points, greatly improves frequency selection and harmonic suppression characteristics without changing the existing dimensions.

Description

technical field [0001] The invention relates to the technical field of substrate-integrated waveguide filters, in particular to a stacked third-order substrate-integrated waveguide filter. Background technique [0002] With the rapid development of mobile communication and satellite communication, higher requirements are put forward for microwave integrated circuits. Highly reliable equipment requires microwave integrated circuits to minimize the area occupied by the circuit while meeting the electrical performance indicators. Narrowband bandpass filters with high quality factor (Q value), equal delay, low insertion loss in-band, and high rejection out-of-band have been paid more and more attention by people. Among them, high quality factor and equal delay will not affect the phase of the signal; low in-band insertion loss will not affect the useful spectrum when filtering the signal; high out-of-band suppression characteristics will affect the useless The spectral signal ...

AI Technical Summary

Problems solved by technology

However, it requires a multi-layer process to achieve, the parasitic characteristics of the passband are poor, and the suppression of unwanted signals, namely noise, is not enough

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