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The present invention discloses a bottle cap, comprising a main cap 1 and a sub-cap 2, wherein the sub-cap 2 is one or more, and the main cap 1 and the sub-cap 2 are detachably connected or integrally connected, the main cap 1 is provided with an opening piece 3 integral with the main cap 1, the sub-cap 2 is provided with an impact end 4, the opening piece 3 is provided with an impacted end 31, and the upper end or the lower end of the opening piece 3 is provided with a petal-shaped body or a strip-shaped body; the technical solution of the present invention is structurally very suitable for mold making and high-speed product production, the bottle cap is opened simply and labor-savingly, liquid can be used without contacting the liquid flow area of ​​the main cap, the use process is simple and convenient and the cost is low, there is no cost increase compared to the original product, it is more hygienic and convenient, and more suitable for daily use.

The application discloses a high-temperature superconducting ultra-wideband filter and a method for suppressing a parasitic passband thereof, and belongs to the technical field of microwave communication. The filter designed by the method comprises a high-temperature superconducting ultra-wideband filter filter medium substrate and a high-temperature superconducting thin film layer located on the medium substrate, and a filter circuit is constructed on the high-temperature superconducting thin film layer. The filter circuit (2) comprises at least one resonator structure, a rectangular microstrip patch, a microstrip branch structure and input and output feed lines. The method for suppressing the parasitic passband of the high-temperature superconducting ultra-wideband filter adjusts the relative position D parameters of the first rectangular microstrip patch, the first rectangular microstrip patch, the third rectangular microstrip patch and the fourth rectangular microstrip patch to control the spectral position of the mode frequency, and adjusts the RW and RL parameters of the first microstrip branch structure, the second microstrip branch structure and the third microstrip branch structure to realize the suppression of the parasitic passband.