Antiphase coupling elliptic function spiral wave filter

Abstract

The invention relates to an antiphase coupling elliptic function spiral wave filter which comprises a spiral wave filter cavity, a spiral wave filter cover plate, an SMA joint, a frequency debugging screw, a coupling debugging screw, a block plate, n resonators and m antiphase coupling mechanisms, wherein n is an integer more than or equal to 3, and m is an integer more than or equal to 1; each resonator comprises a polytetrafluoroethylene medium framework and a positive phase spiral coil, wherein the positive phase spiral coil is wound on the polytetrafluoroethylene medium framework; each antiphase coupling mechanism includes two antiphase spiral coils and an antiphase feed cable, wherein the antiphase spiral coils are wound on the polytetrafluoroethylene medium framework along the reverse direction from the earthing position of the positive phase spiral coil, and the winding direction is opposite to the direction of the positive phase spiral coil, so that antiphase current is generated; on the premise of not increasing the volume, the weight and the loss, a pair of or a plurality of attenuation pole points are formed outside a band of the wave filter, so that inhibition outside the band can be greatly improved. The spiral wave filter has the advantages of novel and compact structure, small volume, light weight and large power capacity.

Description

technical field [0001] The invention relates to an anti-phase spiral filter, in particular to a multi-coupling elliptic function spiral filter, which belongs to the technical field of communication. Background technique [0002] There are few reports on elliptic function helical filters, mainly due to the particularity of helical resonators, and there is no practical and effective design software, which makes the design and implementation very difficult. In 2000, Lora Corporation of the United States proposed a half-wavelength dual-mode elliptic function helical filter. Its structural feature is to realize a cavity dual-mode technology on a helical resonator. Although the number of resonators is halved, the half-wavelength resonator is used again The height of the spiral resonator is doubled; in addition, the coupling between the dual-mode resonators depends on the 45-degree tuning screw. When the number of coil turns is large (for example, when it is more than 10), the diam...

AI Technical Summary

Problems solved by technology

But the disadvantage is that the design is complicated, and there are three or four types of coupling. It takes a lot of manpower and material resources to develop such a filter, and it is difficult to engineer. In addition, because it is foldable, the volume becomes large and the practicability is poor.

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