A Broadband Substrate Integrated Waveguide Filter Using U-Slot Lines

Abstract

The invention discloses a broadband substrate integrated waveguide filter adopting a U-shaped groove line. The broadband substrate integrated waveguide filter comprises a substrate integration waveguide. The substrate integration waveguide comprises a dielectric substrate, two metal patches, an upper row of metal through holes and a lower row of through holes, wherein the two metal patches are arranged on the front surface and the rear surface of the dielectric substrate respectively and form an upper wall and a lower wall of the substrate integration waveguide, the upper row of metal through holes and the lower row of through holes form a left wall and a right wall of the substrate integration waveguide, and the U-shaped groove line is etched in the metal patch on the front surface of the dielectric substrate to enable the substrate integration waveguide to form a multimode resonator. According to the broadband substrate integrated waveguide filter, the substrate integration waveguide form the multimode resonator by means of the etched U-shaped groove line, complexity caused by etching a periodical EBG structure on the substrate integration waveguide is eliminated, requirements of a miniaturized broadband communication system can be met, the shortcoming of large loss of the traditional micro-strip broadband filter is overcome, the problem of high manufacturing cost caused by utilizing a metallic waveguide is solved, and therefore, the broadband substrate integrated waveguide filter adopting the U-shaped groove line has good application prospect.

Description

technical field [0001] The invention relates to a broadband substrate integrated waveguide filter, in particular to a broadband substrate integrated waveguide filter using U-shaped groove lines, which belongs to the field of wireless communication. Background technique [0002] Wireless communication technology is playing an increasingly important role in real social life. As an important component in the field of wireless communication, the demand for band-pass filters is also increasing. The earlier microstrip bandpass filter was widely used due to its convenience in plan drawing and board making, but this kind of filter has a large loss, especially at high frequencies, it will produce a lot of energy radiation. With the continuous development of communication technology, the requirements for filters are getting higher and higher. Although the millimeter-wave filter using metal waveguide can achieve better technical indicators, it is expensive and cannot be widely used; t...

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Problems solved by technology

[0006] 3) The above two broadband filters are designed on the microstrip line, and the relative bandwidth is very wide, but they have a common defect that the loss is relatively large

Simulation results such as Figure 3c As shown, the relative bandwidth is close to 65%, and the loss is small, but this structure is more complicated and not easy to design and process

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