CN217334367U

CN217334367U - Miniaturized two-frequency-band filter

Info

Publication number: CN217334367U
Application number: CN202221232228.XU
Authority: CN
Inventors: 刘金慈; 卜哲峰; 齐绍光
Original assignee: Hebei Junzhou Communication Technology Co ltd
Current assignee: Hebei Bangxing Special Equipment Co ltd
Priority date: 2022-05-19
Filing date: 2022-05-19
Publication date: 2022-08-30
Anticipated expiration: 2032-05-19

Abstract

The utility model relates to a wave filter technical field just discloses a miniaturized two frequency channel wave filter, including first interface, second interface, coupling line and two syntonizers, first interface links to each other with the coupling line, the coupling line forms the coupled relation with first fluting syntonizer, the opposite side of coupling line forms the coupled relation through interdigital structure and second fluting syntonizer, at the opposite side of this syntonizer, links to each other with the second interface through the coupling line. The utility model can independently control the center frequency of two resonance modes; an interdigital structure is introduced between the two resonators to generate a new transmission zero point, so that the selectivity of the passband is improved. The filter can realize good work of two frequency bands in 4G and 5G communication systems, and the physical size of the filter can be determined by adjusting the coupling coefficient and the external quality factor of the filter, so that the structure is miniaturized.

Description

Miniaturized two-frequency-band filter

Technical Field

The utility model relates to a wave filter technical field specifically is a miniaturized two frequency channel wave filters.

Background

In the conventional dual-band communication system, to implement dual-band communication, two communication systems operating independently in different frequency bands need to be designed and implemented in combination, so that the size, complexity and power consumption of the whole dual-band communication system are greatly increased, and the reliability and stability of the whole communication system are reduced, which is contrary to the development direction of the modern communication system towards small size, low power consumption and high stability. Therefore, the microwave device capable of simultaneously working in two frequency bands is designed to solve the problems, and the microwave device is beneficial to realizing the high performance requirements of further miniaturization, low power consumption, high stability and the like of a related communication system.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art, the utility model provides a miniaturized two frequency channel wave filters has solved the problem of proposing in the above-mentioned background art.

The utility model provides a following technical scheme: a miniaturized two-frequency band filter comprises a first interface, a second interface, a coupling line and two resonators, wherein the first interface is connected with the coupling line, the coupling line and a first slotted resonator form a coupling relation, the other side of the coupling line and a second slotted resonator form a coupling relation through an interdigital structure, and the other side of the resonator is connected with the second interface through the coupling line.

Preferably, the resonator is a single-ended short 1/4 wavelength uniform impedance resonator, and has a length of L1, a width of W1, a grounded bottom, and a rectangular slot longitudinally opened at the other end opening end, the slot having a width of W2 and a depth of L2, the widths of the dielectric plates at two sides of the slot being W3 and W4, respectively, (W3/W4 equals 2).

Preferably, an interdigital capacitor with the length of L3 is introduced between the two resonators.

Compared with the prior art, the utility model discloses possess following beneficial effect:

the utility model can independently control the center frequency of two resonance modes; an interdigital structure is introduced between the two resonators to generate a new transmission zero point, so that the selectivity of the passband is improved. The filter can realize the good work performance of two frequency bands in 4G and 5G communication systems, and the physical size of the filter can be determined by adjusting the coupling coefficient and the external quality factor of the filter, thereby realizing the miniaturization of the structure.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:

fig. 1 is a schematic structural view of the present invention;

fig. 2 is the improved schematic diagram of the uniform impedance resonator of the present invention.

In the figure: 1. a first interface; 2. a second interface; 3. a coupling line; 4. a resonator is provided.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The accompanying drawings are only for illustrative purposes and are only schematic drawings rather than actual drawings, which are not intended to limit the present disclosure, and in order to better illustrate the embodiments of the present disclosure, some components of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product.

In the description of the present invention, it should be further noted that, unless explicitly stated or limited otherwise, the terms "disposed" and "connected" should be interpreted broadly, and may be, for example, fixedly connected, movably connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediate medium, or connected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

Referring to fig. 1-2, a miniaturized two-band filter includes a first interface 1, a second interface 2, a coupling line 3 and two resonators 4, where the first interface 1 is connected to the coupling line 3, the coupling line 3 is coupled to the first slotted resonator 4, the other side of the coupling line 3 is coupled to the second slotted resonator 4 through an interdigital structure, the other side of the resonator 4 is connected to the second interface 2 through the coupling line 3, the resonator 4 is a single-ended short-circuited 1/4 wavelength uniform impedance resonator, has a length of L1, a width of W1, a bottom ground, a rectangular slot longitudinally opened at the other end open end, a width of W2 and a depth of L2, dielectric plates on both sides of the slot have widths of W3 and W4, W3/W4 is 2, an interdigital structure capacitor with a length of L3 is introduced between the two resonators 4, as shown in fig. 1, a single-ended short-circuited 1/4 wavelength uniform impedance resonator 4, the length of the slot is L1, the width of the slot is W1, the bottom of the slot is grounded, a rectangular slot is longitudinally formed in the other end opening end, the width of the slot is W2, the depth of the slot is L2, the width of the dielectric plates on two sides of the slot is W3 and W4 respectively, (W3/W4 is 2), and two resonant frequencies are generated.

The first resonance frequency of the modified resonator 4 is determined by the electrical length corresponding to the total length L1 of the resonator, the second resonance frequency is determined by the electrical length corresponding to the slot depth length L2 of the resonator 4 and the electrical length corresponding to the width W1 of the resonator 4, and the two resonance frequencies can be independently controlled by changing different parameters (see fig. 2, coupling coefficient, determined by the higher resonance frequency and the lower resonance frequency of the resonator 4, the interval S3 between the two resonators 4, the distance S6 from the interdigital structure to the bottom end of the resonator 4, the interdigital structure length S5, the dielectric constant of a dielectric plate and the like), so that the dual-band filter is designed.

Between two improved resonators 4, an interdigital capacitor with the length of L3 is introduced, and by adjusting the external quality factor of the filter (the external quality factor is determined by the lengths of coupling wires S1 and S2 and the interval S4 between the feed line and the resonator 4), the coupling characteristic between the resonators 4 can be improved, and a frequency-controllable dual-channel filter can be formed without increasing extra size. The filter can generate two additional transmission zeros, so that the selectivity of the filter can be improved.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A miniaturized two-band filter comprises a first interface (1), a second interface (2), a coupling line (3) and two resonators (4), and is characterized in that: the first interface (1) is connected with a coupling line (3), the coupling line (3) and a first slotted resonator (4) form a coupling relation, the other side of the coupling line (3) and a second slotted resonator (4) form a coupling relation through an interdigital structure, and the other side of the resonator (4) is connected with a second interface (2) through the coupling line (3).

2. A miniaturized two-band filter according to claim 1, characterized in that: the resonator (4) is a single-end short-circuit 1/4 wavelength uniform impedance resonator, the length is L1, the width is W1, the bottom is grounded, a rectangular groove is longitudinally formed in the opening end of the other end, the width of the groove is W2, the depth is L2, the widths of dielectric plates on two sides of the groove are W3 and W4 respectively, and W3/W4 is 2.

3. A miniaturized two-band filter according to claim 1, characterized in that: an interdigital capacitor with the length of L3 is introduced between the two resonators (4).