A bidirectionally adjustable cross-coupling structure

Abstract

A bidirectionally adjustable cross-coupling structure. The present invention couples with a resonator through a coupling metal column and a metal sleeve sleeved on the upper part thereof. By adjusting the length of the side wall of the metal sleeve and the diameter distance between the metal sleeve and the coupling metal column, the low-end frequency range or the high-end frequency range of the coupling passband can be adjusted, which can play a role of bidirectional adjustment. The coupling structure provided by the present invention solves the shortcomings of the prior art, such as the small coupling area and the small coupling strength adjustment range, in a simple way, and can greatly increase the coupling area between the coupling component and the resonant rod and the adjustable range of the coupling strength. At the same time, the coupling structure of the present invention has a simple structure and low implementation cost, and can be widely used in communication front-end equipment components such as duplexers, combiners, filters, etc., and has a high value of promotion and application.

Description

Technical Field

[0001] The invention relates to the field of microwave devices, and in particular to a bidirectionally adjustable cross-coupling structure. Background Art

[0002] Duplexers, combiners, filters, etc. are widely used in front-end devices in the communication field, and the parameter indicators of these communication front-end devices will directly affect the communication quality of the entire communication system. In order to meet some technical specifications such as capacitive cross-coupling, tap coupling, volume, weight, technical indicators, etc., the coupling components will be used to perform non-contact or contact coupling with the resonant rod main rod in the product components during the design process of the product components.

[0003] The capacitive cross-coupling structure usually uses a rod-shaped resonant rod, and sets a metal coupling component (usually a dumbbell-shaped or L-shaped metal sheet) on the side of the resonant rod to couple with the resonant rod; the inductive cross-coupling structure usually uses a rod-shaped resonant rod and a metal sheet connected to it. Both of the above coupling methods have their limitations. The above coupling method requires a variety of components to achieve its performance. In addition, the above coupling method has a small adjustable range. For some high-requirement products, the above coupling method cannot meet the actual required accuracy, resulting in product indicators that cannot be met and poor performance.

[0004] In addition, in the above coupling methods, capacitive coupling can basically only suppress the low end of the passband, and inductive coupling can basically only suppress the high end of the passband. The existing coupling methods cannot achieve bidirectional coupling. Summary of the invention

[0005] The present invention aims at the deficiencies of the prior art and provides a device capable of adjusting the low-end frequency range or the high-end frequency range of a coupling passband, and realizing bidirectional coupling through the same device structure.

[0006] Firstly, to achieve the above-mentioned purpose, a bidirectionally adjustable cross-coupling structure is proposed for use in front-end equipment devices in the communication field, comprising: a coupling metal column, arranged on the side of a resonator in the device and parallel to the resonator; a metal sleeve, sleeved on the upper part of the coupling metal column, comprising a side wall and a top cover surrounding the upper part of the coupling metal column; the length of the side wall of the metal sleeve and / or the diameter distance between the metal sleeve and the coupling metal column are adjusted according to the low-end frequency range required for the coupling passband or the high-end frequency range required for the coupling passband.

[0007] Optionally, in the above-mentioned bidirectionally adjustable cross-coupling structure, the coupling metal column is a solid or hollow cylinder, elliptical column, square column or triangular column; the cross-section of the metal sleeve perpendicular to the axial direction of the resonator is circular, elliptical, square or triangular; the metal sleeve and the coupling metal column are arranged to be concentric or eccentric.

[0008] Optionally, in the above-mentioned bidirectionally adjustable cross-coupling structure, the resonator is a hollow structure, including at least two, the coupling metal column is arranged between the two resonators, the two resonators are parallel to the coupling metal column, and the two resonators are also connected by a transverse rib structure; the coupling metal column is arranged on the side of the transverse rib structure, and there is no direct electrical contact between the coupling metal column and the transverse rib structure.

[0009] Optionally, in the above-mentioned bidirectionally adjustable cross-coupling structure, the resonator, coupling metal column, metal sleeve, and cross-rib structure are all enclosed by a metal cavity, and tap couplings are respectively provided at both ends of the metal cavity, and the tap couplings are used to feed signals into the metal cavity or output signals.

[0010] Optionally, in the above-mentioned bidirectionally adjustable cross-coupling structure, the number of the resonators is 3, and the 3 resonators are connected into a closed ring by the transverse rib structure, wherein the first and second resonators are respectively arranged at coupling end faces close to two tap couplings at both ends of the metal cavity, and the third resonator is arranged to deviate from the tap coupling; the coupling metal column is arranged close to the outer side wall of the transverse rib structure connecting the first and second resonators; and the lower end of the side wall of the metal sleeve has no direct electrical contact with the transverse rib structure.

[0011] Optionally, in the above-mentioned bidirectionally adjustable cross-coupling structure, the transverse rib structure connecting the resonators extends upward from the lower bottom of the metal cavity, and the minimum extension height is 0. The upward height of the transverse rib structure is determined according to the required coupling amount between the resonator and the coupling metal column.

[0012] Optionally, in the above-mentioned bidirectionally adjustable cross-coupling structure, an adjusting screw is further provided between the resonators, and the adjusting screw is parallel to the resonator and is used to adjust the coupling amount with the resonator, or to adjust the signal within the coupling passband.

[0013] Optionally, in the above-mentioned bidirectionally adjustable cross-coupling structure, the adjusting screw is fixed to the upper wall of the metal cavity by a nut; the adjusting screw extends from the upper wall of the metal cavity into the metal cavity, close to the side wall of the resonator; and the adjusting screw includes at least two.

[0014] Optionally, in the above-mentioned bidirectionally adjustable cross-coupling structure, the metal sleeve and the resonator are parallel to the coupling metal column, and a threaded metal rod is connected to the top cover of the metal sleeve, one end of the threaded metal rod is connected and fixed to the upper wall of the metal cavity, and the other end of the threaded metal rod extends to above the coupling metal column in the metal cavity, so as to adjust the length of the metal sleeve surrounding the upper part of the side wall of the coupling metal column.

[0015] Optionally, in the above-mentioned bidirectional adjustable cross-coupling structure, the front-end equipment device in the communication field includes: a duplexer, or a combiner, or a filter.

[0016] Beneficial Effects

[0017] The present invention couples with the resonator through a coupling metal column and a metal sleeve sleeved on the upper part thereof. By adjusting the length of the side wall of the metal sleeve and the distance in the diameter direction between the metal sleeve and the coupling metal column, the low-end frequency range or the high-end frequency range of the coupling channel can be adjusted, which can play a role of bidirectional adjustment. The coupling structure provided by the present invention solves the shortcomings of the existing technology of small coupling area and small coupling strength adjustment range in a simple way, and can greatly increase the coupling area between the coupling component and the resonant rod and the adjustable range of coupling strength.

[0018] At the same time, the present invention also provides a variety of simple and effective coupling strength adjustment methods. The coupling structure of the present invention has a simple structure and low implementation cost, and can be widely used in communication front-end equipment components such as duplexers, combiners, filters, etc., and has a high promotion and application value.

[0019] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 It is a schematic diagram of the overall structure of a front-end device in the communication field of the present invention;

[0022] Figure 2 yes Figure 1 Schematic diagram of the vertical cross section of the device;

[0023] Figure 3 It is a three-dimensional structural schematic diagram of the bidirectionally adjustable cross-coupling structure of the present invention.

[0024] In the figure, 1 represents a metal cavity; 2 represents a cover plate; 3 represents a screw; 4 represents a resonator; 5 represents a metal sleeve; 6 represents a nut; 7 represents an adjusting screw; 8 represents a tap coupling; 9 represents a joint mounting screw; and 10 represents a connector. DETAILED DESCRIPTION

[0025] In order to make the purpose and technical solution of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as those generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as herein.

[0027] The meaning of "and / or" in the present invention means that both the cases where each exists alone or both exist at the same time are included.

[0028] The meaning of “inside” and “outside” in the present invention refers to the direction pointing to the inside of the device as inside, and the opposite direction as outside, relative to the device itself; it is not a specific limitation on the device equipment of the present invention.

[0029] The meaning of "up" and "down" in the present invention refers to the direction from the metal cavity of the device to the cover plate relative to the device itself, that is, up is the direction, and vice versa is down; it is not a specific limitation on the device equipment of the present invention.

[0030] The term “connection” as used in the present invention may mean a direct connection between components or an indirect connection between components via other components.

[0031] Figure 1 A communication front-end device according to the present invention may be a filter, a duplexer, or a combiner. Figure 2 The above communication front-end device is provided with a bidirectional adjustable cross-coupling structure, which is used for the communication front-end device components, including a coupling metal column, a metal sleeve 5 and a resonator 4:

[0032] The coupling metal column is arranged on the side of the resonator 4 in the device and is parallel to the resonator 4;

[0033] The metal sleeve 5 is sleeved on the upper part of the coupling metal column, and includes a side wall and a top cover surrounding the upper part of the coupling metal column. The coupling metal column is parallel to the side of the resonator. The resonator 4 can be optionally set as a hollow structure.

[0034] The length of the side wall of the metal sleeve 5 and / or the diameter distance between the metal sleeve 5 and the coupling metal column are adjusted according to the low-end frequency range required for the coupling passband or the high-end frequency range required for the coupling passband. A resonant frequency is generated between the metal sleeve 5 and the coupling metal column. Specifically, the longer the length of the side wall of the metal sleeve 5 surrounding the coupling metal column, especially the longer the length of the metal sleeve 5 surrounding the upper part of the side wall of the coupling metal column, the smaller the diameter distance between the metal sleeve 5 and the coupling metal column, or the closer the diameters of the two are, the lower the zero frequency of the suppression signal generated on the coupling passband will be, and the low-end frequency range required for the coupling passband will be adjusted. Conversely, the zero frequency of the suppression signal generated on the coupling passband will be higher, and the high-end frequency range required for the coupling passband will be adjusted. The above adjustment process will also affect the coupling condition between the two, so it is necessary to set specific device parameters according to the working frequency band, such as the length, diameter, and ratio of the coupling metal column and the metal sleeve, or to achieve it by adjusting the coupling amount.

[0035] The resonator 4 may be a hollow tubular structure. The coupling metal column is a solid cylinder, which constitutes an independent resonance unit and can generate a resonance frequency.

[0036] The metal sleeve 5 for adjustment is composed of a hollow cylinder and a metal rod with threads.

[0037] Specifically, the coupling structure includes a metal cylinder for forming a coupling metal column and a metal sleeve arranged above the metal cylinder; the metal sleeve 5 surrounds the metal cylinder, and the size structure of the metal sleeve above the metal cylinder can be set to adjust the direction of coupling, that is, to adjust the high-end frequency range or low-end frequency range required for the coupling passband. The coupling structure also includes a hollow resonator 4 arranged on the side of the metal cylinder. An adjustment screw 7 made of metal material can also be arranged between the metal cylinder and the hollow resonator, and this adjustment screw can be used to adjust the strength of the coupling amount. Specifically, the adjustment screw 7 is arranged to be parallel to the resonator 4, and is used to adjust the coupling amount with the resonator 4, or to adjust the signal within the coupling passband.

[0038] Specifically, the metal sleeve 5 and the resonator 4 are parallel to the coupling metal column. A threaded metal rod is connected to the top cover of the metal sleeve 5. One end of the threaded metal rod is connected and fixed to the upper wall of the metal cavity 1. The other end of the threaded metal rod extends to the top of the coupling metal column in the metal cavity 1, and is used to adjust the length of the metal sleeve 5 surrounding the upper part of the side wall of the coupling metal column.

[0039] In the above structure, the metal cylinder can also be replaced by a solid or hollow round rod, square rod, triangular rod, etc. to reduce the occupied space and make the structure more compact. The cross section of the metal sleeve 5 perpendicular to the axial direction of the resonator 4 can be set to be circular, elliptical, square or triangular; the metal sleeve 5 and the coupling metal column can be set to be concentric or eccentric, symmetrical or asymmetrical.

[0040] refer to Figure 2 or Figure 3 The bidirectional adjustable cross-coupling structure provided by the present invention can be specifically used in front-end devices in the communication field such as duplexers, combiners, or filters. As a communication device, it is further provided with a metal cavity 1 for enclosing the resonator 4, the coupling metal column, the metal sleeve 5, and the cross rib structure in the cover plate on the upper side of the metal cavity 1.

[0041] Tap couplings 8 are respectively provided at two ends of the metal cavity 1 , and the tap couplings 8 are used to feed signals into the metal cavity 1 or output signals.

[0042] Considering the difficulty of component processing and space occupation, the metal sleeve 5 is preferably an adjustment ring with a circular ring structure, which is the most ideal adjustment method with a very long adjustment range referring to the frequency range, while the other adjustment ranges are smaller than the frequency range.

[0043] The coupling strength of the coupling structure in the above structure can be adjusted by a variety of methods:

[0044] For example, the purpose of changing the coupling strength and coupling direction is achieved by adjusting the adjusting collar above the metal cylinder or the adjustable coupling screws on both sides of the metal cylinder.

[0045] In addition, reference Figure 3In the structure shown, the three resonators ABC can also be connected by a transverse rib structure to play a role in connecting the strength of coupling. The height of the transverse rib structure will affect the coupling strength between them. The adjustable coupling screw can be set on both sides of the hollow resonator AC close to the metal cylinder. The coupling metal column is set on the side of the transverse rib structure, and there is no direct electrical contact between the coupling metal column and the transverse rib structure, and between the coupling screw and the transverse rib structure. Setting the above structure to the corresponding size through simulation software can achieve the required frequency and coupling amount.

[0046] In the above structure, the metal cylinder can be machined on the cavity, or screwed from the bottom of the cavity. The collar on the metal cylinder is fixed to the cover plate by threads. The collar and the metal cylinder are isolated by air.

[0047] The number of the resonators 4 can be set to 3 as shown in the figure. The three resonators 4 are connected by the transverse rib structure into a closed ring, wherein the first and second resonators 4 are respectively set to be close to the coupling end faces of the two tap couplings 8 at both ends of the metal cavity 1, and the third resonator 4 is set to deviate from the tap coupling 8; the coupling metal column is set close to the outer wall of the transverse rib structure connecting the first and second resonators 4; the lower end of the side wall of the metal sleeve 5 has no direct electrical contact with the transverse rib structure. The transverse rib structure of each resonator 4 extends upward from the lower bottom of the metal cavity 1, and the minimum extension height is 0. The upward height of the transverse rib structure is determined according to the required coupling amount between the resonator 4 and the coupling metal column.

[0048] The adjusting screws 7 on both sides of the transverse rib structure between the resonators are fixed to the upper wall of the metal cavity 1 through nuts 6, extending from the upper wall of the metal cavity 1 to the inside of the metal cavity 1, close to the side wall of the resonator 4. The adjusting screw 7 is fine-tuned by adjusting its advance or retreat through nuts 6: the deeper the screw is inserted into the cavity, the stronger the suppression of the band outside, and the deeper the screw is, the weaker the suppression of the band outside. Figure 3 In the figure, the two adjusting screws 7 arranged close to the coupling metal column are used to adjust the coupling amount with the two resonators 4 close to the tap coupling 8, while the two adjusting screws 7 arranged near the resonator B can be used to adjust the signal in the passband. Figure 3 As shown, the transverse ribs connecting the resonators AC can be provided with bends according to the coupling requirements to improve the coupling amount. The bends and heights of the transverse ribs can be determined by software simulation according to the coupling amount requirements.

[0049] Those skilled in the art should note that in this embodiment, the metal cylinder cannot be placed between the hollow resonators AB, but can only be placed between the resonators AC.

[0050] In summary, the cross-coupling structure provided by the present invention can be used for communication front-end equipment components such as duplexers, combiners, and filters. The cross-coupling structure is composed of a metal cylinder, a hollow resonant column, and an adjusting screw collar. The metal cylinder and the hollow resonant column are used to generate suppression at the high and low ends of the passband to achieve cross-coupling, overcome the limitations of the prior art, that is, it can suppress both the low end of the passband and the high end of the passband, and can play a role in bidirectional regulation. In addition to being able to adjust the low end of the debugging passband by adjusting downwards through the metal collar, and adjusting the high end of the debugging passband by adjusting upwards through the metal collar, that is, realizing bidirectional regulation, the present invention can also fine-tune the strength of the coupling amount through the screws on both sides of the metal cylinder to achieve compensation for coupling degree deviation under high index requirements. The present invention is simple and does not require assembly, that is, it is simple and clear and saves cost.

[0051] The above is only an embodiment of the present invention, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A bidirectional adjustable cross-coupling structure for front-end devices in the communication field. It is characterized in that include: A coupling metal column, arranged on the side of the resonator (4) in the device and parallel to the resonator (4); A metal sleeve (5) is sleeved on the upper part of the coupling metal column, comprising a side wall and a top cover surrounding the upper part of the coupling metal column; the length of the side wall of the metal sleeve (5) and / or the distance in the diameter direction between the metal sleeve (5) and the coupling metal column are adjusted according to the low-end frequency range required by the coupling passband or the high-end frequency range required by the coupling passband; The coupling metal column is machined on the cavity, or is screwed and fixed from the bottom of the cavity; The resonator (4) is a hollow structure, the coupling metal column is arranged between the two resonators (4), the two resonators (4) are parallel to the coupling metal column, and the two resonators (4) are also connected via a transverse rib structure; There is no direct electrical contact between the coupling metal column and the transverse rib structure; The resonator (4), the coupling metal column, the metal sleeve (5), and the transverse rib structure are all enclosed by a metal cavity (1); two ends of the metal cavity (1) are respectively provided with tap couplings (8); the tap couplings (8) are used to feed signals into the metal cavity (1) or to output signals; The number of the resonators (4) is three, and the three resonators (4) are connected by the transverse rib structure to form a closed ring, wherein the first and second resonators (4) are respectively arranged to be close to the coupling end faces of the two tap couplings (8) at the two ends of the metal cavity (1), and the third resonator (4) is arranged to be away from the tap coupling (8); The coupling metal column is arranged close to the outer side wall of the transverse rib structure connecting the first and second resonators (4); The lower end of the side wall of the metal sleeve (5) has no direct electrical contact with the transverse rib structure.

2. The bidirectionally adjustable cross-coupling structure as claimed in claim 1, It is characterized in that The coupling metal column is a solid or hollow cylinder, elliptical cylinder, square cylinder or triangular cylinder; The cross-section of the metal sleeve (5) perpendicular to the axial direction of the resonator (4) is circular, elliptical, square or triangular; The metal sleeve (5) and the coupling metal column are arranged to be concentric or eccentric.

3. The bidirectionally adjustable cross-coupling structure as claimed in claim 1, It is characterized in that A transverse rib structure connecting the resonators (4) extends upward from the bottom of the lower side of the metal cavity (1), with the lowest extension height being 0, and the upward height of the transverse rib structure being determined according to the required coupling amount between the resonator (4) and the coupling metal column.

4. The bidirectionally adjustable cross-coupling structure according to claim 1, It is characterized in that An adjusting screw (7) is also provided between the resonators (4); the adjusting screw (7) is parallel to the resonator (4) and is used to adjust the coupling amount with the resonator (4) or to adjust the signal within the coupling passband.

5. The bidirectionally adjustable cross-coupling structure as claimed in claim 4, It is characterized in that The adjusting screw (7) is fixed to the upper wall of the metal cavity (1) via a nut (6); the adjusting screw (7) extends from the upper wall of the metal cavity (1) into the metal cavity (1) and is close to the side wall of the resonator (4); the adjusting screw (7) comprises at least two.

6. The bidirectionally adjustable cross-coupling structure according to claim 1, It is characterized in that The metal sleeve (5) and the resonator (4) are both parallel to the coupling metal column; a metal rod with a thread is connected to the top cover of the metal sleeve (5); one end of the metal rod with a thread is connected and fixed to the upper wall of the metal cavity (1); the other end of the metal rod with a thread extends to above the coupling metal column in the metal cavity (1) to adjust the length of the metal sleeve (5) surrounding the upper part of the side wall of the coupling metal column.

7. The bidirectionally adjustable cross-coupling structure according to claim 1, It is characterized in that The front-end equipment devices in the communication field include: a duplexer, or a combiner, or a filter.

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