Dual Band Waveguide Filters

Abstract

The invention discloses a dual-band waveguide filter, comprising: an input port P1 of a rectangular waveguide, an output port P2, an upper cavity 1, a lower cavity 2, and a dielectric substrate between the upper cavity 1 and the lower cavity 2 3. The front of the dielectric substrate 3 includes two symmetrical C-shaped resonators 31 and two symmetrical middle folded resonators 32; the back of the dielectric substrate 3 includes two metal strips 33; the dielectric substrate 3 has two A row of metallized through-holes 34 are respectively provided on the sides, and the dielectric substrate 3 is inserted into the upper cavity 1 and the lower cavity 2 through the metallized through-holes 34 . The dual-band waveguide filter disclosed by the present invention has a small size and is easy to produce in batches.

Description

Technical field [0001] The present invention relates to the technical field of millimeter wave waveguide filters, in particular to dual-band waveguide filters. Background technique [0002] Waveguide filters are widely used in communication systems such as microwave and millimeter wave communications, satellite communications, and radar due to their advantages of low loss and large power capacity. However, the traditional cavity waveguide filter is at a disadvantage in terms of volume and weight. In order to solve this problem, researchers have proposed an E-plane waveguide filter. Since then, E-plane waveguide filters have been extensively researched and developed. From the traditional cascaded half-wave cavity structure (see Y. Konishi and K. Uenakada, "The Design of a Bandpass Filter with Inductive Strip--Planar Circuit Mounted in Waveguide," Microwave Theory and Techniques, IEEE Transactions on, vol. 22, pp.869-873,1974.) In order to further reduce the size, foreign scholar...

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Problems solved by technology

Most of the studies on dual-band waveguide filters use resonant cavities and dual-mode resonant cavities (see V.Nocella, F.Cacciamani, C.Tomassoni, R.Sorrentino, and L.Pelliccia,"Dual-band filters based on TM dual-mode cavities," in European Microwave Conference (EuMC), 2014 44th, 2014, pp.179-182. and S. Amari and M. Bekheit," A New Class of Dual-Mode Dual-Band Waveguide Filters," Microwave Theory and Techniques , IEEE Transactions on, vol.56, pp.1938-1944, 2008.), this design method will inevitably cause the designed filter to be bulky and heavy, and it is not conducive to mass production

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