CN201163654Y

CN201163654Y - Compact waveguide filter

Info

Publication number: CN201163654Y
Application number: CNU2008200616386U
Authority: CN
Inventors: 王清源; 张先荣
Original assignee: Chengdu Sinoscite Technology Co Ltd
Current assignee: Chengdu Sinoscite Technology Co Ltd
Priority date: 2008-01-04
Filing date: 2008-01-04
Publication date: 2008-12-10
Anticipated expiration: 2018-01-04

Abstract

The utility model discloses a compact waveguide filter, comprising a flange plate (1), a wave guide (2) and a tuning screw (3). The compact waveguide filter is characterized by also comprising at least one metal post (4). The axial direction of the metal post (4) is perpendicular to that of the wave guide, only one end of the metal post is connected with the inner wall of the waveguide, and the position and the length of the metal post in the wave guide is fixed and can not change from the outside of the wave guide. The aim of the compact waveguide filter is fulfilled by the following mode: because the position of the metal post (4) in the wave guide is fixed, the processing error of the filter is adjusted by another tuning screw; compared with the prior evanescent mode waveguide filter, the compact waveguide filter brings great convenience to the adjustment of the filter, improves the antivibration ability of the filter and ensures that the insertion loss of the filter is reduced. The compact waveguide filter has important applications in various electric systems such as communication, radar and electronic countermeasure.

Description

A kind of compact waveguide filter

Technical field

The utility model relates to a kind of microwave filter, specifically, relates to a kind of compact waveguide filter.

Background technology

Withered mode filter (Evanescent mode filter) is made up of the tuning plug in waveguide, the waveguide.This filter has the little advantage of volume.The tuning plug needs that are used for the resonance purpose extend into waveguide deeply outside waveguide.This tuning plug extend in the waveguide the degree of depth and with respect to waveguide axis to perpendicularity cooperate by the screw thread of tuning screw rod upper end, the screw in the waveguide and the nut that is positioned at the waveguide outside and finish.In order to guarantee that tuning plug inserts the degree of depth in the waveguide and constant with respect to the direction of waveguide, must make the screw long enough in the waveguide and realize closely cooperating with the screw thread of tuning plug upper end.This makes that the adjusting of this filter is very difficult.This filter also has the shortcoming of shock resistance difference.Because mismachining tolerance, the threaded portion of tuning screw rod upper end also usually extend in the waveguide, causes the Insertion Loss of this filter to raise.

The utility model content

The purpose of this utility model is to overcome above-mentioned deficiency of the prior art, and a kind of compact waveguide filter easy, that shock resistance is strong, Insertion Loss is littler of regulating is provided.

For achieving the above object, a kind of compact waveguide filter that the utility model is announced comprises ring flange, and waveguide and tuning screw is characterized in that, also comprise at least one metal column.Described metal column axially with waveguide axis to vertical, only at one end is connected with the waveguide inwall, its position and length in waveguide is fixed, and can not be from the change of waveguide outside.

Described metal column can play the effect of the tuning plug in the common withered mould waveguide filter, but its position is fixed in waveguide.Mismachining tolerance is then finished by the other tuning screw in the waveguide.The length that these tuning screws extend in the waveguide is very short, less than waveguide half in the screw axial size, thereby to its with waveguide on screwed hole between the tightness degree that cooperates require to reduce greatly.

The purpose of this utility model is achieved in that the tuning screw rod of each root place at common withered mould waveguide filter, replaces tuning plug with fixing metal column.And mismachining tolerance is then finished by the other tuning screw that extend into by waveguide in the waveguide.

As improvement, described metal column and waveguide can be used as integral body and process, thereby further increase the shock resistance of filter.

As further improvement, the cross section of described metal column is a rectangle, is beneficial to cut down finished cost.

In addition, in order to improve the coupling of compact waveguide filter of the present utility model and other external waveguide device, the shape of cross section of described waveguide can also be along waveguide axis to ladder or smooth mode gradual change.

Description of drawings

Fig. 1 is a kind of compact waveguide filter structural representation of the present utility model.

Compact waveguide filter structural representation when Fig. 2 is the utility model employing rectangular metal post.

Embodiment

Below in conjunction with accompanying drawing, the utility model preferred embodiment is described.What need point out is that although similar parts appear in the different accompanying drawings, they are endowed similar reference numerals.In addition, in the following description, when perhaps the detailed description of known function that adopts and design can desalinate subject content of the present utility model, these were described in here and will be left in the basket.

Fig. 1 is a kind of compact waveguide filter structural representation of the present utility model.Among the figure, compact waveguide filter of the present utility model comprises the ring flange that is positioned at two ends, waveguide and 7 tuning screws, and 4 cross sections are the metal column of arbitrary shape.Described metal column axially with waveguide axis to vertical, only at one end is connected, and its position and length in waveguide fixes, and can not be from the change of waveguide outside with the waveguide inwall.

Embodiment 1

Fig. 2 is the schematic diagram of a kind of embodiment of compact waveguide filter of the present utility model.As shown in Figure 2, in the present embodiment, waveguide is a straight wave guide, and wherein two ends adopt cross sectional dimensions along the hierarchic structure that waveguide vertically outwards increases, and is used for filter and closes on coupling between the waveguide.The shape of cross section of 4 metal columns is a rectangle.Wherein except that the upper end of second metal column with the waveguide upper inner surface links to each other, all the other 3 metal columns all link to each other with the following inner surface of waveguide.Be provided with 7 tuning screws altogether, wherein 4 tuning screws are positioned on the wave guide wall and relative with the disjunct end of wave guide wall with 4 metal columns, the resonance frequency that is used to regulate resonance structure.Other 3 tuning screws are regulated the coupling between the resonance structure between metal column.Add man-hour, filter can divide two parts processing up and down.Wherein second metal column from left to right and waveguide upper cover part are as one milling processing, and its excess-three root metal column is processed as the one milling bottom waveguide.

Advantage of the present utility model is, employing is fixed on the tuning plug that the metal column on the wave guide wall replaces the employing screw thread in the common withered mould waveguide filter to fix, improved filter shock resistance, made things convenient for the tuning process of filter, and the insertion loss of filter is reduced.

The utility model can be used as filter and uses separately, also can constitute duplexer, multiplexer, and mixers etc. are widely used in the military and civilian system of electronic system, particularly radar, missile guidance, the communication etc. of each microwave band.

Although above the illustrative embodiment of the utility model is described, so that those skilled in the art understand the utility model.But should be understood that the utility model is not limited to the scope of embodiment, to those skilled in the art, as long as various variations appended claim limit and the spirit and scope determined in, these variations are conspicuous.All innovation and creation that utilize the utility model design are all at the row of protection.

Claims

1, a kind of compact waveguide filter comprises ring flange, and waveguide and tuning screw is characterized in that, also comprises at least one metal column,

Described metal column axially with waveguide axis to vertical;

Described metal column only at one end is connected with the waveguide inwall;

Position and the length of described metal column in waveguide is fixed, and can not change from waveguide is outside.

2, compact waveguide filter according to claim 1 is characterized in that, the shape of cross section of described metal column is a rectangle.

3, compact waveguide filter according to claim 2 is characterized in that, described tuning screw extend into length in the waveguide less than waveguide half in the screw axial size.

4, compact waveguide filter according to claim 3 is characterized in that, the cross section size of described waveguide along waveguide axis to diminishing gradually with ladder or smooth form from the waveguide two ends to the centre.