CN210326069U

CN210326069U - Dielectric waveguide filter

Info

Publication number: CN210326069U
Application number: CN201920620492.2U
Authority: CN
Inventors: 严盛喜; 秦伟; 陈建新; 杨安刚; 王猛; 汪玮玺; 赵俊
Original assignee: Yangzhou Jiangjia Technology Co ltd
Current assignee: Yangzhou Jiangjia Technology Co ltd
Priority date: 2019-05-01
Filing date: 2019-05-01
Publication date: 2020-04-14
Anticipated expiration: 2029-05-01

Abstract

The utility model relates to a dielectric waveguide filter. The dielectric waveguide filter is formed by combining a plurality of dielectric waveguide resonators, and the dielectric waveguide resonators meet the following requirements: the working main modes of all dielectric waveguide resonators are the same or similar, but the harmonic distribution of the dielectric waveguide resonators is greatly different. The utility model discloses dig the dielectric block of different shapes, not unidimensional on dielectric waveguide syntonizer, adjust dielectric waveguide syntonizer's size simultaneously for the work fundamental mode of different dielectric waveguide syntonizers is the same or close, but its harmonic distribution has great difference, and then utilizes these different dielectric waveguide syntonizers to constitute band pass filter. Since the fundamental modes of operation of these dielectric waveguide resonators are the same or similar, the bandpass filter can be designed with the fundamental modes. Meanwhile, the harmonic distribution difference of different dielectric waveguide resonators is large, and the harmonics cannot be coupled and transmitted among the resonators, so that the harmonics of the constructed band-pass filter are effectively suppressed.

Description

Dielectric waveguide filter

Technical Field

The utility model relates to a radio frequency communication filtering technical field especially relates to a dielectric waveguide filter and harmonic suppression method thereof.

Background

With the rapid development of mobile communication technology, the requirements of mobile communication systems for essential band-pass filters of radio frequency front ends thereof are higher and higher, such as miniaturization, light weight, low loss, good temperature drift characteristics, and the like. Compared with the traditional planar transmission line and metal cavity filter, the dielectric waveguide band-pass filter has great advantages in the aspects of the performances. Therefore, dielectric waveguide filters are the mainstream choice for future mobile communication systems. However, the greatest disadvantage of the dielectric waveguide filter is that the resonant mode is complex, and many resonant modes are close to the operating main mode, so that an undesirable parasitic response is close to the passband of the bandpass filter, and the stop band rejection performance of the bandpass filter is seriously affected. Therefore, how to design a dielectric waveguide filter with harmonic suppression performance is a very meaningful study.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to the poor technical problem of dielectric waveguide filter's the harmonic suppression performance that exists among the prior art, provided a dielectric waveguide filter and harmonic suppression method thereof, remedied prior art at this technical field's technical vacancy.

Therefore, the utility model adopts the technical scheme that: a dielectric waveguide filter is formed by combining a plurality of dielectric waveguide resonators, and the dielectric waveguide resonators meet the following requirements: the working main modes of all dielectric waveguide resonators are the same or similar, but the harmonic distribution of the dielectric waveguide resonators is greatly different.

Furthermore, the main modes of the dielectric waveguide resonators meet the requirement that the difference is smaller than the passband bandwidth of the dielectric waveguide filter.

Further, the harmonic distribution of each dielectric waveguide satisfies a difference larger than twice the passband bandwidth of the dielectric waveguide filter.

Further, the method for meeting the requirements of the dielectric waveguide resonator on the distribution of the main mode and the harmonic wave adopts the following steps: and dielectric blocks with different shapes and sizes are dug out on the dielectric waveguide resonator, and the size of the dielectric waveguide resonator is adjusted.

Further, the hollowed-out dielectric block may be cylindrical, rectangular, or a combination thereof.

Further, when the dielectric waveguide resonators are combined into the dielectric waveguide filter: the dielectric waveguide resonator at the forefront end is provided with an input port structure, and the dielectric waveguide resonator at the rearmost end is provided with an output port structure; feed structures are arranged on the dielectric waveguide resonators at the frontmost end and the rearmost end; and signal coupling transmission is formed between adjacent dielectric waveguide resonators through the coupling window.

Furthermore, the dielectric blocks dug out of all the resonators forming the filter can be consistent; one part of the resonators can be hollowed out of a dielectric block in the form of one shape, and the other part of the resonators can be hollowed out of a dielectric block in the form of another shape.

Furthermore, only one type of dielectric block can be dug out of each resonator, and dielectric blocks in different shapes can be dug out.

Furthermore, when the resonators are dug with dielectric blocks in different shapes, the dug dielectric blocks can be communicated, and the dug dielectric blocks can also be in discontinuous structural forms.

Further, circular grooves are respectively etched on the lower bottom surfaces of the foremost resonator and the rearmost resonator to serve as input and output ports of signals; and a cylindrical dielectric block is dug below the frontmost resonator and the rearmost resonator respectively to form a feed structure.

The utility model provides a main part thought of harmonic suppression method is: dielectric blocks with different shapes and sizes are dug on the dielectric waveguide resonators, the sizes of the dielectric waveguide resonators are adjusted simultaneously, so that the working main modes of the different dielectric waveguide resonators are the same or similar, but the harmonic wave distributions of the different dielectric waveguide resonators are different greatly, and the different dielectric waveguide resonators are utilized to construct the band-pass filter. Since the fundamental modes of operation of these dielectric waveguide resonators are the same or similar, the bandpass filter can be designed with the fundamental modes. Meanwhile, the harmonic distribution difference of different dielectric waveguide resonators is large, and the harmonics cannot be coupled and transmitted among the resonators, so that the harmonics of the constructed band-pass filter are effectively suppressed.

Drawings

Fig. 1 and 2 are schematic structural diagrams of the dielectric waveguide resonator of the present invention.

Fig. 3 is a schematic structural diagram of embodiment 1 of the dielectric waveguide filter according to the present invention.

Fig. 4 is a simulation result of embodiment 1 of the dielectric waveguide filter provided by the present invention.

Fig. 5 is a schematic structural diagram of embodiment 2 of the dielectric waveguide filter according to the present invention.

Fig. 6 is a schematic structural diagram of embodiment 3 of the dielectric waveguide filter according to the present invention.

Detailed Description

A dielectric waveguide filter is formed by combining a plurality of dielectric waveguide resonators, and the dielectric waveguide resonators meet the following requirements: the working main modes of all dielectric waveguide resonators are the same or similar, but the harmonic distribution of the dielectric waveguide resonators is greatly different.

Following the utility model discloses make further explanation to better understand the utility model discloses:

the specific filter design is as follows:

firstly, dielectric waveguide resonators with dielectric blocks of different shapes and sizes are designed, such as the dielectric waveguide resonator shown in fig. 1 with a shorter cylindrical dielectric block, and the dielectric waveguide resonator shown in fig. 2 with a longer cylindrical dielectric block. The cylindrical dielectric block cut out here may also be of other shapes. The two dielectric waveguide resonators in fig. 1 are adjusted in size and the dielectric block is cut out so that their main modes are the same or similar, and their harmonic distribution is greatly different.

A four-order dielectric waveguide filter is designed by using two dielectric waveguide resonators in FIG. 1, and as shown in FIG. 3, the four dielectric waveguide filters are composed of four dielectric waveguide resonators, and the outer surfaces of the whole structures of the four dielectric waveguide filters are metalized. In which the resonator 1 and the resonator 4 employ the dielectric waveguide resonator shown in fig. 1, and the resonator 2 and the resonator 3 employ the dielectric waveguide resonator shown in fig. 2. And circular grooves are respectively etched on the lower bottom surfaces of the resonator 1 and the resonator 4 and are used as input and output ports of signals. A cylindrical dielectric block is dug below the resonator 1 and the resonator 4 respectively to form a feeding structure, namely a feeding cylinder 1 and a feeding cylinder 2. The resonator 1 and the resonator 2 form coupling transmission of signals through the coupling window 1, the resonator 2 and the resonator 3 form coupling transmission of signals through the coupling window 2, and the resonator 3 and the resonator 4 form coupling transmission of signals through the coupling window 3.

The working principle of the whole filter is as follows: the signal is input into the resonator 1 through the circular ring-shaped groove 1 and the feed cylinder 1, is coupled to the resonator 2 through the coupling window 1, is coupled to the resonator 3 through the coupling window 2, is coupled to the resonator 4 through the coupling window 3, and is output through the feed cylinder 2 and the circular ring-shaped groove 2.

A fourth-order dielectric waveguide filter shown in fig. 2 is constructed in electromagnetic simulation software, electromagnetic simulation is performed, and simulation S parameters shown in fig. 4 are obtained through optimization. The designed filter has an operating passband from 2.5GHz to 2.7GHz and an upper stopband rejection to 5.5GHz with a rejection level of 40 dB.

As shown in fig. 5, a schematic structural diagram of another embodiment of the dielectric waveguide filter according to the present invention is provided. In this embodiment, the dielectric waveguide filter has substantially the same structure as that of the dielectric waveguide filter shown in fig. 3, except that the dielectric block hollowed out in two of the dielectric resonators is rectangular in this embodiment.

As shown in fig. 6, a schematic structural diagram of another embodiment of the dielectric waveguide filter according to the present invention is shown. In this embodiment, the dielectric waveguide filter has substantially the same structure as that of the dielectric waveguide filter shown in fig. 6, except that the dielectric block hollowed out in all the dielectric resonators is rectangular in this embodiment.

Through simulation, the dielectric waveguide filters shown in fig. 5 and 6 have a good harmonic suppression effect.

The utility model discloses a dielectric block shape except above-mentioned cylindrical, square, still can form the dielectric block of other shape forms, all possesses fine harmonic suppression effect.

Claims

1. A dielectric waveguide filter, characterized in that, the dielectric waveguide filter is composed of a plurality of dielectric waveguide resonators, each dielectric waveguide resonator satisfies the following requirements: the working main modes of all dielectric waveguide resonators are the same or similar, but the harmonic distribution of the dielectric waveguide resonators is greatly different.

2. A dielectric waveguide filter according to claim 1, wherein the fundamental modes of the dielectric waveguide resonators have a difference smaller than the passband bandwidth of the dielectric waveguide filter.

3. A dielectric waveguide filter according to claim 1 or 2, wherein the harmonic distributions of the dielectric waveguides are satisfied to differ by more than twice the passband bandwidth of the dielectric waveguide filter.

4. A dielectric waveguide filter according to claim 1, wherein dielectric blocks of different shapes and sizes are cut out of the dielectric waveguide resonators while adjusting the sizes of the dielectric waveguide resonators.

5. A dielectric waveguide filter according to claim 4 wherein the cut-out dielectric blocks are cylindrical, rectangular or a combination thereof.

6. A dielectric waveguide filter according to claim 1, wherein, in combining the dielectric waveguide resonators into the dielectric waveguide filter: the dielectric waveguide resonator at the forefront end is provided with an input port structure, and the dielectric waveguide resonator at the rearmost end is provided with an output port structure; feed structures are arranged on the dielectric waveguide resonators at the frontmost end and the rearmost end; and signal coupling transmission is formed between adjacent dielectric waveguide resonators through the coupling window.

7. A dielectric waveguide filter according to claim 1, wherein the resonators of the filter are formed by removing dielectric blocks uniformly; one part of the resonators can be hollowed out of a dielectric block in the form of one shape, and the other part of the resonators can be hollowed out of a dielectric block in the form of another shape.

8. A dielectric waveguide filter according to claim 1 wherein the resonators are each hollowed out of dielectric blocks of only one shape or of a plurality of different shapes.

9. A dielectric waveguide filter according to claim 8 wherein the resonators are cut with dielectric blocks of different shapes, each cut dielectric block being connected and each cut dielectric block being disconnected.

10. A dielectric waveguide filter according to claim 6, wherein annular grooves are etched in the lower bottom surfaces of the frontmost resonator and the rearmost resonator, respectively, as input/output ports for signals; and a cylindrical dielectric block is dug below the frontmost resonator and the rearmost resonator respectively to form a feed structure.