Double-layer triangular substrate integrated waveguide filter

Abstract

The invention discloses a double-layer triangular substrate integrated waveguide band-pass filter which comprises three metal layers and two dielectric layers, the whole structure is divided into two complete equilateral triangle resonant cavities which are arranged in a layered and tightly attached mode and an equilateral triangle resonant cavity folded along the center line, and two microstrip lines are connected with the two complete cavities respectively. A rectangular groove is etched in the middle metal layer to enable the two complete cavities to be coupled, and a round hole is etched in the position close to the complete cavities to serve as a direct coupling hole between input and output. The three triangular resonant cavities are coupled pairwise to form the band-pass filter, a transmission zero point is formed at a low-frequency position outside a passband and two transmission zero points are formed at a high-frequency position outside the passband by utilizing direct coupling of input and output and cross coupling inside the triangular resonant cavities, and the defect of poor out-of-band performance is overcome. The filter is simple in design structure, simple in feeding, capable of effectively suppressing out-of-band harmonics, low in processing difficulty and more suitable for being applied to modern millimeter wave circuit integration.

Description

technical field [0001] The invention relates to a double-layer triangular substrate integrated waveguide filter, which belongs to the technical field of millimeter waves. Background technique [0002] As an important part of RF / microwave circuits, modern filters are developing in the direction of low cost, light weight, miniaturization, high power capacity, and high performance. Substrate Integrated Waveguide (SIW: Substrate Integrated Waveguide) has become a research hotspot because of its high quality factor, low loss, small size, and high power capacity. In the past two decades, several high-performance, low-cost substrate-integrated waveguide filters have been proposed. There are many researchers on the traditional substrate-integrated waveguide technology, such as rectangular and circular substrate-integrated waveguides. However, the research on triangular substrate integrated waveguides is still insufficient. [0003] At the same time, with the continuous improvemen...

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Problems solved by technology

However, the research on triangular substrate integrated waveguides is still insufficient

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