Substrate integrated waveguide high-pass filter

Abstract

The invention discloses a substrate integrated waveguide high-pass filter. The filter comprises a narrow-band substrate integrated waveguide band rejection filter, a traditional substrate integrated waveguide high-pass filter and a substrate integrated waveguide step transition section between the narrow-band substrate integrated waveguide band rejection filter and the traditional substrate integrated waveguide high-pass filter. A whole substrate integrated waveguide part comprises a metal paster, a medium substrate and metal through holes. The metal paster is arranged on the surface of the medium substrate. The two ends of the metal paster are transformed into microstrip lines with the impedance of 50 ohm through trapezoid microstrip gradual change lines in a transition mode. The microstrip lines are connected with the input end and the output end of the whole filter. The narrow-band substrate integrated waveguide band rejection filter is composed of stub line resonators. The output end of the band rejection filter is connected with the substrate integrated waveguide step transition section, and the step transition section is of a two-order waveguide step gradual change structure. The waveguide step transition section is directly connected with the traditional high-pass filter. The upper sideband of the band rejection filter is the cut-off frequency of the traditional substrate integrated waveguide high-pass filter. According to the filter, good out-of-band rejection is guaranteed, and the passband-in return loss is small.

Description

technical field [0001] The invention relates to the technical field of microwave filters, in particular to a substrate-integrated waveguide high-pass filter. Background technique [0002] Transmission lines are generally divided into planar transmission lines and non-planar transmission lines. Planar transmission lines include microstrip lines and coplanar waveguides, which are easy to integrate with other devices such as semiconductors; non-planar transmission lines mainly include rectangular waveguides, circular waveguides, coaxial lines, etc., which are not easy to integrate and cost high. Substrate Integrated Waveguide (SIW) contains the advantages of the above two transmission lines and is a combination of the two transmission lines. [0003] The substrate-integrated waveguide filter is a filter implemented on a dielectric substrate. Its performance is similar to that of a rectangular waveguide filter, so it has the advantage of a high quality factor. On the other han...

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Problems solved by technology

[0004] The substrate integrated waveguide itself has high-pass characteristics, but the passband characteristics are not easy to control and adjust

In order to reduce the size of the device, the concept of the half-mode substrate integrated waveguide was proposed. Although the size is reduced by half, the energy leakage is much larger than that of the full-mode substrate integrated waveguide, and the half-mode substrate integrated waveguide high-pass filter also exists. Disadvantages of not being able to trade off out-of-band rejection and in-band return loss

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