Double-frequency substrate-integrated waveguide band-pass filter with double-layer structure

Abstract

The invention discloses a double-frequency substrate-integrated waveguide band-pass filter with a double-layer structure. The double-frequency substrate-integrated waveguide band-pass filter comprises a lower-layer structure and an upper-layer structure, wherein a substrate-integrated waveguide is formed by the lower-layer structure and the upper-layer structure, and the lower-layer structure comprises a first metal sheet, a first dielectric base plate, a second metal sheet and a plurality of lower-layer metal through holes; the second metal sheet is encircled into a first resonator and a second resonator through the lower-layer metal through holes, a first passing hole is loaded in the first resonator, a first gap is etched, a second passing hole is loaded in the second resonator, and a second gap is etched; a third metal sheet is encircled into a third resonator and a fourth resonator through upper-layer metal through holes, a third passing hole is loaded in the third resonator, and a fourth passing hole is loaded in the fourth resonator; the first resonator is coupled to the third resonator through the first gap, and the second resonator is coupled to the fourth resonator through the second gap. The filter disclosed by the invention has the advantages of high quality factor, small size, simple design and good performance.

Description

technical field [0001] The invention relates to a substrate-integrated waveguide bandpass filter, in particular to a dual-frequency substrate-integrated waveguide bandpass filter with a double-layer structure, 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. Dual-band band-pass filter (DB-BPF) has received great attention due to its wide application in modern wireless communication systems. The earlier DB-BPF directly cascaded two single-frequency BPFs. This method has more degrees of freedom for design, but the filter size is too large. Another method is to introduce a band-stop filter (BSP) in the middle of the wideband BPF to divide the passband into two parts to achieve dual frequency, which inevitably requires additional d...

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Problems solved by technology

Although the performance of the filter designed by this method is excellent, the production cost is expensive because the LTCC technology has not yet been popularized.

[0006] 3) In 2005, Mahbubeh Esmaeili and others published a paper titled "Substrate integrated waveguide triple-passband dual-stopband filter using six cascaded singlets" on IEEE Microwave and Wireless Components Letters, proposing to use six cascaded singlets on the substrate integrated waveguide A three-pass bandpass filter is designed with a single cavity, but the size of this structure is too large

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