Balanced dual-mode bandpass filter based on double-layer substrate integrated waveguide

Abstract

The invention discloses a double-layer substrate integrated waveguide-based balanced dual-mode band-pass filter; the balanced dual-mode band-pass filter comprises an upper surface metal layer, a firstdielectric substrate, a middle metal layer, a second dielectric substrate and a lower surface metal layer which are sequentially and coaxially arranged from top to bottom. Two sets of feed ports arearranged in the upper surface metal layer and the lower surface metal layer separately; a plurality of metal through holes and two micro-disturbance metal through holes are formed in the first dielectric substrate and the second dielectric substrate; and a rectangular metal gap is formed in the center of the middle metal layer. According to the filter, the characteristics of the PEC-PMC are utilized, and the rectangular metal gap is etched in the middle metal layer, so that the characteristic of high common mode rejection in a wide frequency band is achieved; and the coupling between the dualmodes in a substrate integrated waveguide rectangular cavity, and a non-resonant node introduced between a source and a load are utilized, so that a controllable transmission zero point and a high-performance balance filter with the high common mode rejection in the wide frequency band are generated on the two sides of a differential mode passband, the selectivity and the common mode rejection performance of the balance filter are effectively improved, and the actual requirements of a differential communication system are met.

Description

technical field [0001] The invention relates to the technical field of balanced filters, in particular to a balanced dual-mode bandpass filter based on a double-layer substrate integrated waveguide. Background technique [0002] With the rapid development of modern communication technology, spectrum resources are increasingly tight. Traditional communication systems are limited by technology and cost, and are widely researched and applied in the frequency spectrum below 6GHz. The microwave high frequency band and the millimeter wave frequency band are more abundant in spectrum resources, which need further research and development. [0003] In communication systems, filter networks are used to transmit and attenuate noise in specific frequency bands, while emerging applications such as wireless communications will place more stringent requirements and challenges on microwave filters—higher performance, smaller size size, lighter weight and lower cost. On the other hand, w...

AI Technical Summary

Problems solved by technology

However, when the operating frequency enters the microwave high frequency band or the millimeter wave band, the above-mentioned balanced filter has high radiation loss, low power handling capability, quality factor Q e Inferior disadvantages, so can not continue to be used

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