CN205583105U - A ridge waveguide litter mode filter - Google Patents

Abstract

The utility model discloses a ridge waveguide mode filter that withers and falls. It includes the cavity and sets up the ridge who runs through the cavity in the cavity, and cavity both ends inner space forms two ridge waveguides respectively, and cavity middle part space forms narrow waveguide, the last interval of ridge is equipped with first resonance unit, second resonance unit and third resonance unit, inside second resonance unit was located narrow waveguide, first resonance unit and third resonance unit were located respectively inside the ridge waveguide at narrow waveguide both ends. The utility model discloses the ridge waveguide cooperatees with narrow waveguide, arranges the partial resonance unit in the ridge waveguide, and direct chambeies (first resonance unit, third resonance unit position) from beginning to end shifts out outside the narrow waveguide promptly to strengthen the excitation of its port, provide the excitation of sufficient port with the relative bandwidth by being increased to 26% within 5%, realized that the leap -type of bandwidth increases.

Description

A ridge waveguide litter mode filter

technical field

The utility model belongs to the technical field of communication, in particular to a ridge waveguide litter mode filter.

Background technique

The relative bandwidth of the waveguide filter within 11G is about 3%, and the same design is required to be compatible with different waveguide sub-bands. These are often the coverage of different frequency bands from 1 to 2G, and the corresponding remote suppression design can also meet Different debugging needs, so that the corresponding relative bandwidth needs to be as high as 15% to meet the requirements, and the input and output ends of the existing litter mode filters are ordinary standard waveguides, and multi-stage impedance transformation is used in the middle. The size of the 11G range is relatively large, and only about 5% of the relative bandwidth can be realized, which seriously restricts its application in the 11G range.

Contents of the invention

The purpose of this utility model is to provide a ridge waveguide litter mode filter with simple structure and relatively high bandwidth in order to solve the shortcomings of the above-mentioned background technology.

The technical scheme adopted by the utility model is: a ridge waveguide litter mode filter, including a cavity and a ridge strip arranged in the cavity and passing through the cavity, two ridge waveguides are formed in the inner space at both ends of the cavity, and the space in the middle of the cavity is A narrow waveguide is formed, and a first resonant unit, a second resonant unit and a third resonant unit are arranged at intervals on the ridge, the second resonant unit is located inside the narrow waveguide, and the first resonant unit and the third resonant unit are respectively located in the narrow waveguide. inside the waveguide with ridges at both ends of the waveguide.

Further, the width and height of the narrow waveguide are smaller than the width and height of the ridge waveguide.

Further, the width of both ends of the ridge is smaller than the width of the middle of the ridge, and both sides of the middle of the ridge are attached to the side walls of the middle of the cavity.

Further, the first resonance unit, the second resonance unit and the third resonance unit are distributed symmetrically along the center of the narrow waveguide.

Further, the first resonant unit, the second resonant unit and the third resonant unit are all rectangular resonant columns.

Furthermore, the thickness of the second resonance unit is greater than the thickness of the first resonance unit and the third resonance unit.

The ridge waveguide of the utility model cooperates with the narrow waveguide, arranges part of the resonant units in the ridge waveguide, that is, directly moves the head and tail cavities (where the first resonant unit and the third resonant unit are located) out of the narrow waveguide to enhance the excitation of its ports , increasing the relative bandwidth from within 5% to 26% provides enough port incentives to achieve a leapfrog increase in bandwidth. At the same time, when the head and tail cavities are gradually moved out of the narrow waveguide, they are placed at the alternating place of wide and narrow waveguides to excite various modes due to the discontinuity of the structure. The combination of these different waveguide modes gives the filter enough port excitation, thus achieving a large bandwidth. promote.

Description of drawings

Fig. 1 is a schematic plan view of the utility model (for convenience of displaying the internal structure, one side of the cavity is transparent in the figure).

Fig. 2 is a sectional view of A-A in Fig. 1 .

In the figure: 1-cavity; 2-ridge strip; 3-ridge waveguide; 4-narrow waveguide; 5-first resonant unit; 6-second resonant unit; 7-third resonant unit.

detailed description

The utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments to facilitate a clear understanding of the utility model, but they do not limit the utility model.

As shown in Figure 1-2, the utility model includes a cavity 1 and a ridge 2 that is arranged in the cavity 1 and runs through the cavity. The inner space of 1.1 at both ends of the cavity 1 forms two ridge waveguides 3 respectively. The cavity 1 The space in the middle part 1.2 forms a narrow waveguide 4, and the first resonant unit 5, the second resonant unit 6 and the third resonant unit 7 are arranged at intervals on the ridge 2, and the second resonant unit 6 is located inside the narrow waveguide 4, The first resonant unit 5 and the third resonant unit 7 are respectively located inside the ridge waveguide 3 at both ends of the narrow waveguide 4 .

The ridge waveguide 3 of the utility model cooperates with the narrow waveguide 4, arranges part of the resonant units in the ridge waveguide, that is, directly moves the head and tail cavities (where the first resonant unit and the third resonant unit are located) out of the narrow waveguide to strengthen its ports Encouragement to increase the relative bandwidth from within 5% to 26% provides enough port incentives to achieve a leapfrog increase in bandwidth. At the same time, when the head and tail cavities are gradually moved out of the narrow waveguide, they are placed at the alternating place of wide and narrow waveguides to excite various modes due to the discontinuity of the structure. The combination of these different waveguide modes gives the filter enough port excitation, thus achieving a large bandwidth. promote.

And compared with the traditional waveguide filter, the input and output are common standard waveguides, and its size is larger within the range of 11G. In addition to the multi-stage 1/4 impedance converter, the structure size of the entire functional module is large. The utility model The ridge wave export and entrance greatly compress the overall size, and the size of the entire functional module is only half of the original solution, but realizes several times the original relative bandwidth. It can be successfully applied in the tool.

As shown in Figure 2, the dimensions of the rectangular opening of the ridge waveguide 3 are wa and wb respectively, the width of 2.1 at both ends of the ridge strip 2 is w1, and the height is h1. These four parameters together determine the cut-off frequency of the ridge waveguide, thereby allowing the waveguide The duplexer signal is normally circulated, and this parameter should be adjusted according to the needs of specific equipment. Both the width a and the height b of the narrow waveguide 4 are smaller than the width wa and height wb of the ridge waveguide 3 .

In the above solution, the width of both ends 2.1 of the ridge 2 is smaller than the width of the middle 2.2 of the ridge, and the two sides of the middle 2.2 of the ridge 2 are attached to the side walls of the middle 1.2 of the cavity 1 .

In the above solution, the first resonant unit 5 , the second resonant unit 6 and the third resonant unit 7 are all rectangular resonant columns. The distance between the first resonant unit 5 and the second resonant unit 6 and the distance between the second resonant unit 6 and the third resonant unit 7 are l1, that is, the first resonant unit 5, the second resonant unit 6 and the third resonant unit 7 are along the The center of the narrow waveguide 4 is distributed symmetrically, and the coupling bandwidth of the entire filter can be adjusted by adjusting the distance between different resonant units. l2 is the distance between the first resonant unit 5 and the third resonant unit 7 and the end face of the narrow waveguide 4. By adjusting l2, the port excitation size of the filter can be adjusted to match the tap excitation needs of different bandwidths.

The height of the first resonant unit 5, the second resonant unit 6 and the third resonant unit 7 is h2, wrs1 is the thickness of the first resonant unit 5 and the third resonant unit 7, wrs2 is the thickness of the second resonant unit 6, by By adjusting wrs1 and h2, the frequencies of the first resonant unit 5 and the third resonant unit 7 can be adjusted; by adjusting wrs2 and h2, the frequency of the second resonant unit 6 can be adjusted. The thickness wrs2 of the second resonance unit 6 is greater than the thickness wrs1 of the first resonance unit 5 and the third resonance unit 7 .

Obviously, those skilled in the art can make various changes and modifications to this document without departing from the spirit and scope of this document. In this way, if these modifications and variations herein fall within the scope of the claims herein and their equivalent technologies, then these modifications and variations are also intended to be included herein. The content not described in detail in this specification belongs to the prior art known to those skilled in the art.

Claims (6)

1. a ridge waveguide evanescent mode wave filter, it is characterized in that: the vallum (2) of through cavities in including cavity (1) and being arranged at cavity, cavity (1) inner space, two ends forms two ridge waveguides (3) respectively, cavity (1) central space forms narrow waveguide (4), the first resonant element (5) it is interval with on described vallum (2), second resonant element (6) and the 3rd resonant element (7), it is internal that described second resonant element (6) is positioned at narrow waveguide (4), the ridge waveguide (3) that first resonant element (5) and the 3rd resonant element (7) lay respectively at narrow waveguide two ends is internal.

A kind of ridge waveguide evanescent mode wave filter the most according to claim 1, it is characterised in that: the width of described narrow waveguide (4) and height are respectively less than width and the height of ridge waveguide (3).

A kind of ridge waveguide evanescent mode wave filter the most according to claim 1, it is characterised in that: described vallum two ends width is less than width in the middle part of vallum, sidewall in the middle part of both sides laminating cavity in the middle part of described vallum.

A kind of ridge waveguide evanescent mode wave filter the most according to claim 1, it is characterised in that: described first resonant element (5), the second resonant element (6) and the 3rd resonant element (7) are symmetrical along narrow waveguide core.

A kind of ridge waveguide evanescent mode wave filter the most according to claim 1, it is characterised in that: described first resonant element (5), the second resonant element (6) and the 3rd resonant element (7) are the resonant column of rectangle.

A kind of ridge waveguide evanescent mode wave filter the most according to claim 1, it is characterised in that: the thickness of described second resonant element (6) is more than the first resonant element (5) and the thickness of the 3rd resonant element (7).