Round-chamber dual-mode side-wall coupling filter capable of inhibiting parasitic coupling

Abstract

The invention provides a round-chamber dual-mode side-wall coupling filter capable of inhibiting parasitic coupling, which can be used as a part independently so as to play the role of filtering a certain frequency band and also can be combined so as to be used as a multiplexer passage filter, to form a multiplexer network. After the electromagnetic field characteristic in the round-chamber dual-mode side-wall coupling filter is analyzed, the aim of inhibiting the parasitic coupling is realized by placing tuning screws at different positions; furthermore, the filter characteristic of the round-chamber dual-mode side-wall coupling filter is reinforced, so as to enable the transmission characteristic of the filter to be symmetric; the advantages of the top-coupled round-chamber dual-mode filter, such as high Q value, wide single-mode working scope, simplicity in debugging and capable of being applied to narrowband design and the like, can be completely inherited, so as to enable the filter to be feasibly applied to the field of a microwave filter of a communication satellite; the filter comprises an upper half chamber body, a lower half chamber body, a frequency tuning screw, a coupling tuning screw and a fastening screw; and an external temperature compensation device can be arranged on the whole filter, so that the temperature stability of the filter can be ensured.

Description

technical field [0001] The invention relates to a circular cavity double-mode sidewall coupling filter for suppressing parasitic coupling, which belongs to the field of microwave filters and can also be used as a channel filter of a multiplexer. Background technique [0002] In satellite communication systems, cavity filters are indispensable passive components. The sidewall coupling filter is a new type of cavity filter suitable for satellite communications. It is similar to the cavity filters commonly used in the world and at home, such as rectangular waveguide diaphragm filters and circular cavity dual-mode top-coupling filters. Compared with, it has outstanding advantages. Rectangular waveguide diaphragm filters are generally used for broadband filters, and their Q values ​​are relatively low. The latter are often used as channel filters for traditional output multiplexers, but because their coupling holes are located on the top of the circular cavity, the filter resona...

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Problems solved by technology

In this way, on the one hand, it overcomes the shortcomings of the commonly used round-cavity dual-mode top-coupled filter, and on the other hand, it inherits its advantages such as high Q value, wide single-mode working range, simple debugging, and can be applied to narrow-band design. The coupling window of the mode side wall coupling filter is located on the side wall of the circular cavity, which introduces a large filter parasitic coupling, which is enough to seriously damage the electrical performance of the filter, making its transmission characteristics asymmetric and unable to meet the index requirements , and cannot be the channel filter of the multiplexer

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