KR20240014417A - Cavity Filter with Small Structure - Google Patents

Abstract

The disclosed embodiment includes a cavity and a resonator formed to extend from one of the side edges of the cavity toward the inside of the cavity, so that the resonator is formed on the side of the cavity so that the size of the cavity is minimized while satisfying the length required for a resonator formed inside the cavity. A cavity filter that can be miniaturized by extending from a direction edge to another side or edge is provided.

Description

Cavity Filter with Small Structure}

The disclosed embodiments relate to a cavity filter, and to a cavity filter having a miniaturized structure.

With the development of mobile communications, the demand for RF equipment such as filters, duplexers, and multiplexers is rapidly increasing. RF equipment is used to filter, separate, and transmit signals in places such as base stations in mobile communication systems.

An RF filter is a device for passing signals in a specific frequency band, and a cavity filter with a cavity structure is mainly used in devices that require high power, such as base stations in mobile communication systems. A cavity filter is a filter that forms at least one cavity inside the filter, has a structure in which a resonator is placed inside each cavity, and performs filtering through resonance in each cavity. In the cavity filter, a specific frequency signal is filtered using resonance caused by a combination of inductance and capacitance, and the band pass characteristics are determined by the connection type of the inductance and capacitance. To this end, the cavity filter is designed to have the desired band-pass characteristics by appropriately setting the cavity size, number of cavities, and resonator structure.

Figure 1 shows an example of an existing cavity filter.

In Figure 1, (a) shows a projection perspective view of an existing cavity filter, and (b) shows a cross-sectional view on the xz plane based on the central axis of the resonator.

Referring to FIG. 1, an existing cavity filter includes a cavity 11 and a resonator 12 provided inside the cavity 11. And the resonator 12 includes a body 13 that has a cylindrical shape and has a cylindrical groove or hole formed therein, and a head 14 formed in the form of a disk with a diameter larger than the diameter of the body 13 at the top of the body 13. It can be composed of:

In the existing cavity filter, the resonator 12 is arranged in a form extending from the center of the lower surface of the cavity 11 in the upper surface direction (here, z-axis direction), as shown in FIG. 1, and at this time, the resonator 12 The top, that is, the top of the head 14, must be spaced apart from the upper surface of the cavity 11, as shown in (b) of FIG. 1.

In the cavity filter having the structure as shown in Figure 1, the length of the body 13, the distance between the top of the head 14 and the upper surface of the cavity 11, and the upper surface of the head 14 and the upper surface of the cavity 11 face each other. By adjusting the area of the region, etc., the cavity filter can have the desired band-pass characteristics.

Therefore, in the cavity filter of FIG. 1, when the required band pass characteristics are specified, the size and shape of the resonator 12 are determined, and the size of the cavity 11 is also determined according to the set size and shape of the resonator 12. In particular, as shown in FIG. 1, the size of the cavity 11 is mainly determined by the length of the body 13 and the area of the head 14.

Meanwhile, current mobile communication systems require more highly sensitive transmission and reception performance and at the same time require smaller equipment. In particular, as the number of miniaturized base stations that control communications for small cells increases, the demand for miniaturization of equipment included in the base station is also increasing. Therefore, there is a continuous demand for miniaturization of cavity filters. However, there is a problem that existing cavity filters with the structure shown in Figure 1 have limitations in miniaturization.

Korea Registered Patent No. 10-2408255 (registered on 2022.06.08)

The disclosed embodiments aim to provide a cavity filter that can be manufactured in a miniaturized structure.

A cavity filter according to an embodiment includes a cavity; and a resonator formed to extend from one of the side edges of the cavity toward the inside of the cavity.

The resonator includes a body extending from a side edge of the cavity toward another inner edge or surface; And it may include a head formed in the direction of two or more inner surfaces of the cavity at one end in the direction in which the body extends.

The body may extend parallel to the lower surface of the cavity.

The body may extend from one lateral edge of the cavity toward a diagonal edge.

The body may be formed in either a cylindrical or polygonal shape.

The head may have two or more sides that are coupled to each other in parallel with two or more adjacent sides inside the cavity.

The head is formed in a fan-shaped cross-section centered on one end of the body, and the fan-shaped shape may be formed with an arc extending to a position adjacent to two or more adjacent sides within the cavity.

The cavity may be formed in the shape of an arc such that an inner edge at a position corresponding to the fan-shaped shape of the head forms a plane parallel to the fan-shaped shape.

The head has upper and lower surfaces formed parallel to the upper and lower surfaces of the cavity, so that coupling can be achieved.

A cavity filter according to an embodiment is disposed in a housing, a plurality of cavities divided by at least one partition formed in the housing, and each of the plurality of cavities, and a side edge of each cavity formed by the housing and the at least one partition. It includes a plurality of resonators formed to extend from one of the resonators toward the inside of the cavity.

Accordingly, the cavity filter according to the embodiment miniaturizes the cavity filter by allowing the resonator to extend from the lateral edge of the cavity toward another side or edge so as to minimize the size of the cavity while satisfying the length required for the resonator formed inside the cavity. can do.

Figure 1 shows an example of an existing cavity filter.
2 and 3 show cavity filters according to one embodiment.
Figure 4 shows an example of a head shape modification of a cavity filter according to an embodiment.
5 and 6 show cavity filters according to another embodiment.
Figure 7 shows a cavity filter according to another embodiment.
Figures 8 and 9 show modified examples of the cavity filters of Figures 5 to 7.
10 and 11 show a cavity filter according to another embodiment.

Hereinafter, specific embodiments of one embodiment will be described with reference to the drawings. The detailed description below is provided to provide a comprehensive understanding of the methods, devices and/or systems described herein. However, this is only an example and the present invention is not limited thereto.

In describing one embodiment, if it is determined that a detailed description of the known technology related to the present invention may unnecessarily obscure the gist of an embodiment, the detailed description will be omitted. In addition, the terms described below are terms defined in consideration of functions in the present invention, and may vary depending on the intention or custom of the user or operator. Therefore, the definition should be made based on the contents throughout this specification. The terminology used in the detailed description is intended to describe only one embodiment and should in no way be limiting. Unless explicitly stated otherwise, singular forms include plural meanings. In this description, expressions such as “comprising” or “comprising” are intended to indicate certain features, numbers, steps, operations, elements, parts or combinations thereof, and one or more than those described. It should not be construed to exclude the existence or possibility of any other characteristic, number, step, operation, element, or part or combination thereof. In addition, terms such as "... unit", "... unit", "module", and "block" used in the specification refer to a unit that processes at least one function or operation, which is hardware, software, or hardware. and software.

2 and 3 show cavity filters according to one embodiment.

In Figures 2 and 3, (a) shows a perspective view of the cavity filter, and (b) shows a cross-sectional view. Here, unlike Figure 1, Figures 2 and 3 (b) show cross-sectional views on the xy plane. That is, Figure 1 shows a cross-sectional view on the xz plane as a longitudinal cross-sectional view, while Figures 2 and 3 show a cross-sectional view on the xy plane as a horizontal cross-sectional view.

2 and 3, the cavity filter according to the embodiment also includes cavities 21 and 31 and resonators 22 and 32 provided inside the cavities 21 and 31. The cavities 21 and 32 may be formed in the shape of a polygonal pillar with an empty interior. 2 and 3, as an example, the cavities 21 and 32 are shown as being formed in a rectangular parallelepiped shape based on a square pillar shape, but the cavities 21 and 32 can be formed in various shapes such as pentagonal pillars or octagonal pillars. You can. And the cavities 21 and 31 may be implemented as metal bodies.

Meanwhile, in this embodiment, the resonators 22 and 32, unlike the resonator 12 of FIG. 1, which is formed in a form extending from the lower surface of the cavity 11 toward the upper surface, are formed on the sides of the cavities 21 and 31. 21, 31) may be formed in a form extending in the inner direction. At this time, the resonators 22 and 32 may be formed to extend parallel to the upper or lower surfaces of the cavities 21 and 31. In particular, in the embodiment, the resonators 22 and 32 are formed in the cavity 21 formed in a polygonal shape. , 31) is formed to extend in the inner direction of the cavities 21 and 31. At this time, the resonators (22, 32) are formed to extend in the direction of other corners or other surfaces inside the cavities (21, 31), and in particular, in the cavities (21, 31), the ends of the resonators (22, 32) are formed as diagonally as possible from the corners where one end is formed. It may be formed to extend in one direction.

This is to ensure that the resonators (22, 32) can secure the required sufficient length even in small-sized cavities (21, 31).

When the resonator 12 is formed to extend from the lower surface of the cavity 11 toward the upper surface as shown in FIG. 1, the size, especially the height, of the cavity 11 must be larger than the length of the resonator 12, which is the size of the cavity filter. This becomes a factor that makes miniaturization difficult. To solve this problem, in the embodiment, the resonators 22 and 32 extend diagonally from the corners rather than specific faces of the cavities 21 and 32, thereby providing a cavity filter with the same performance required even with a smaller-sized cavity. Make it possible to manufacture. In other words, it allows the cavity filter to be miniaturized.

At this time, if the cavities (21, 31) are implemented in the form of an empty square pillar, hexagonal pillar, or octagonal pillar, the resonators (22, 32) are formed in the cavity (21, 31) so that they can be formed at the longest length. It may be formed to extend diagonally from one lateral edge of . However, if the cavities 21 and 31 are implemented in a form that does not have corners in opposing directions, such as hollow 5-sided or 7-sided pillars, the resonators 22 and 32 are located on the sides located in opposite directions. It may be formed to extend toward the nearest edge. Additionally, in some cases, it may be formed to extend toward the side in the opposite direction.

Meanwhile, the resonators 22 and 32 may be divided into bodies 23 and 33 and heads 24 and 34. The bodies 23 and 33 may have one end formed at one of the side corners of the cavities 21 and 31, and the other end may be formed in the form of an empty tube extending diagonally. The bodies 23 and 33 may be formed in a polygonal or cylindrical tube shape as shown in FIG. 2, or may be formed in a square tube shape as shown in FIG. 3.

The heads 24 and 34 are formed at the other end of the bodies 23 and 33 in the direction in which the bodies 23 and 33 extend, and as shown in Figures 2 and 3 (b), the cross section in the xy plane The cavities 21 and 31 may be formed with two or more inner surfaces adjacent to each other. In particular, in the embodiment, the heads 24 and 34 are formed to facilitate capacitive coupling with the inner surface located in the cavity 21 and 31 in the opposite direction to the direction in which the bodies 23 and 33 are connected. You can.

In general, it is known that in the resonators 22 and 32 of a cavity filter, the bodies 23 and 33 mainly affect the inductance of the cavity filter, while the heads 24 and 34 mainly affect the capacitance. Therefore, in the cavity filter, not only the inductance according to the length of the bodies 23 and 33 of the resonators 22 and 23, but also the capacitance of the heads 24 and 34 must be able to satisfy the required characteristics. That is, even if the bodies 23 and 33 of the resonators 22 and 23 are formed to extend in the diagonal direction of the cavities 21 and 31, if sufficient capacitance is not secured due to the size or shape of the heads 24 and 34, the required Since these characteristics cannot be obtained, the size of the cavities 21 and 31 must be increased.

Accordingly, unlike the cavity filter of FIG. 1 in which the head 14 is coupled to a single surface inside the cavity 11, the cavity filter of the embodiment has a body ( Considering the shapes of the cavities 23 and 33, the heads 24 and 34 are formed to be coupled to at least two sides of the cavities 21 and 31. That is, as shown in FIGS. 2 and 3, in the embodiment, the heads 24 and 34 of the resonators 22 and 32 are located in the cavities 21 and 31 located in the diagonal direction in which the bodies 23 and 33 extend. It is formed to have two or more side surfaces and parallel surfaces. This is to allow the heads 24 and 34 to be coupled to two or more sides of the cavities 21 and 31 in a large area, so that the capacitance can be greatly increased even in small-sized cavities 21 and 31.

In particular, in the embodiment, the upper and lower surfaces of the heads 24 and 34 are formed parallel to the upper and lower surfaces of the cavity, so that the heads 24 and 34 are formed not only on the inner surfaces of the cavities 21 and 31 but also on the upper surfaces. And capacitive coupling can be achieved with the lower surface.

At this time, the cross-sectional shape of the heads 24 and 34 in the xy plane can be adjusted in various ways. As an example, the head 24 of FIG. 2 has a relatively large cross-sectional area compared to the head 34 of FIG. 3, so that the upper and lower surfaces of the cavity as well as the two or more sides of the cavity 21 and 31 are capacitive. Since the coupling is strong, the capacitance of the cavity filter increases, while the length of the body 23 is shortened and the inductance becomes small. On the other hand, since the head 34 of FIG. 3 has a smaller cross-sectional area than the head 24 of FIG. 2, the capacitance is reduced, while the inductance can be increased by the relatively long length of the body 23. That is, the shape of the head and the length of the body can be adjusted in various ways depending on the required capacitance and inductance. Additionally, if it is desired to increase both inductance and capacitance, the head can be made to have a small cross-sectional area, but the number of inner surfaces of the cavity to which the head can be coupled can also be increased. For example, in FIG. 3, the head 34 may have surfaces adjacent to four inner surfaces of the cavity rather than the two inner surfaces, allowing the cavity filter to have a larger capacitance.

Here, the resonators 22 and 32 may also be implemented as metal bodies.

Figure 4 shows an example of a head shape modification of a cavity filter according to an embodiment.

In FIG. 4 , the cavities 41 to 81 are shown assuming that the inside is formed in the shape of an empty rectangular parallelepiped, and the bodies 43 to 83 of the resonators 42 to 82 are one side of the cavities 41 to 81. It is formed to extend diagonally from one of the corners (here, the lower right corner as an example) (here, the upper left corner).

As shown in (a) of FIG. 4, the cross section of the head 44 of the resonator 42 may be manufactured into a square shape or various other shapes. That is, the head 44 can be formed in various shapes that can achieve a required level of capacitive coupling with two or more sides, the upper surface, and the lower surface of the cavity 41.

In some cases, as shown in (b) and (c), the heads 54 and 64 may have a sector-shaped cross-section in the xy plane, such as a semicircle or circular arc, rather than a polygonal shape. Even when the heads 54 and 64 are formed in a fan shape, they can be coupled to two or more sides of the cavities 51 and 61, and can also be coupled to the upper and lower surfaces. However, when the heads 54 and 64 are formed in a fan-shaped shape, the head 54 having a fan-shaped cross-section as in (b) may be coupled with different strengths depending on the positional distance from the side of the cavity 51. You can. Accordingly, as shown in (c), the inner edge of the cavity 51 is formed in an arc shape to form a parallel plane according to the arc shape of the head 54 having a fan-shaped cross section, so that coupling of uniform strength as a whole can be achieved. there is. That is, the shape of the inner side of the cavity may also be modified depending on the various shapes of the head.

As a result, the cavity filter according to the embodiment can increase the body length of the resonator and the coupling area of the head even in a small-sized cavity, and can maintain the required characteristics even when manufactured in a very small size compared to the existing cavity filter shown in FIG. 1. can satisfy.

5 and 6 show cavity filters according to another embodiment.

2 to 4 show a cavity filter having a single cavity (21, 31). However, cavity filters used as RF filters are mostly composed of a multi-stage filter configuration to satisfy insertion loss characteristics and skirt characteristics. As such, a cavity filter having a multi-stage configuration is typically composed of a plurality of filters separated from each other by a plurality of partition walls formed within a housing constituting the external shape of the cavity filter.

5 and 6 , as an example, there are four partitions 75 to 78 and 85 to 88 formed in directions perpendicular to each other in a rectangular housing, and the cross-sectional shape is defined by cavities each having a rectangular parallelepiped shape. A cavity filter including filters 71 to 74 and 81 to 84 is shown. However, the shape of the housing can be changed in various ways, and the number and arrangement of partition walls can also be changed in various ways. That is, the number and shape of filters provided by the cavity filter can be adjusted in various ways depending on the shape of the housing and the number and arrangement of partitions. Here, the housing and the partition walls 75 to 78 and 85 to 88 may be formed of metal or may be formed by metal plating. And the partition walls (75 to 78, 85 to 88) that separate the multiple filters (71 to 74, 81 to 84) within the housing do not completely separate and isolate the adjacent filters (71 to 74, 81 to 84). A portion may be formed in an open form. For example, the partition walls 75 to 78 and 85 to 88 are formed so that the top and bottom are spaced apart from the upper and lower surfaces of the housing at a certain distance, or an open window area is formed, so that the signal is filtered through resonance between adjacent filters. can be delivered easily.

Each of the four filters 71 to 74 and 81 to 84 is oriented inward from the side edge of the cavity whose shape is defined by the housing and partition walls 75 to 78 and 85 to 88, similar to the cavity filters of FIGS. 2 to 4. It is provided with a resonator formed in a shape that extends. The resonator of each filter (71 to 74, 81 to 84) may be formed to extend toward another corner or side of the interior. Each resonator may be composed of a body and a head, and the body may be formed to extend parallel to the upper or lower surface of the housing in a diagonal direction from the side edge. Additionally, the head may be formed to have surfaces adjacent to two or more inner surfaces of a cavity formed by a housing or a partition.

A cavity filter having this configuration may have different characteristics depending on the direction in which the head of the resonator is formed. First, as shown in FIG. 5, the cavity filter may be formed in a pattern in which the body of each resonator in the plurality of filters 71 to 74 extends from adjacent corners and the head radiates outward. Conversely, as shown in FIG. 6, the cavity filter may be formed in a pattern in which the body of each resonator in the plurality of filters 71 to 74 extends inward from the outer edge and the head is concentrated inward.

In the case of FIG. 5, in the plurality of filters 71 to 74 arranged adjacent to each other, the bodies of the resonators are arranged close to each other, while the heads are arranged far apart. In this case, a signal can be transmitted between adjacent filters by creating resonance mainly based on inductance coupling. On the other hand, in the case of FIG. 6, the heads of the resonators in the plurality of filters 81 to 84 are arranged close to each other, while the bodies are arranged far apart. Signals can be transmitted between adjacent filters by creating resonance mainly based on capacitance coupling.

Additionally, the cavity filter further includes an input port (not shown) to which a signal is applied and an output port (not shown) to which a filtered signal is output. At this time, the filter through which the input port and output port are formed are not limited, but considering the characteristics of the cavity filter, the input port and output port are formed so that the signal input to the input port passes through all filters provided and is output through the output port. A filter must be determined.

For example, in a cavity filter having the structure shown in FIGS. 5 and 6, the input port may be formed in the first filters 71 and 81, and the output port may be formed in the fourth filters 74 and 84. At this time, the input port and output port may be formed on the side of the housing of the first filters 71 and 81 and the fourth filters 74 and 84, or may be formed on the lower or upper surface.

When the input port and the output port are formed in the first filters 71 and 81 and the fourth filters 74 and 84, respectively, the signal applied through the input port is connected to the first to fourth filters 71 to 74 and 81 to 84. ) can be sequentially passed to the output port, and cross-coupling can be performed between the first filters 71 and 81 and the fourth filters 74 and 84. At this time, inductance-based cross-coupling may be performed in the cavity filter of FIG. 5, while capacitance-based cross-coupling may be performed in the cavity filter of FIG. 6.

Here, a cavity filter with four filters is shown as an example, but the number, size, and shape of the filters can be adjusted in various ways.

Additionally, the cavity filter may further include supports 79 and 89 that extend from the lower surface of the housing to the upper surface and are formed in a direction in which the two or more partition walls 75 to 78 and 85 to 88 intersect each other. A ground voltage may be applied to the supports 79 and 89 together with the housing and partition walls 75 to 78 and 85 to 88.

Figure 7 shows a cavity filter according to another embodiment.

FIG. 7 shows a cavity filter having a multi-stage structure including three filters (91 to 93) separated by three partitions (94 to 96). In the cavity filter of FIG. 7, each filter (91 to 93) is formed in the shape of a hexagonal pillar, and is implemented in an overall honeycomb shape. In a cavity filter having this structure, the resonator provided in each filter may also be formed to extend inward from the side edge of the cavity whose shape is defined by the housing and the partition walls 94 to 96, and the body of the resonator is It may be formed to extend parallel to the upper or lower surface of the housing in a diagonal direction from the side edge, and the head may be formed to have surfaces adjacent to two or more inner surfaces of a cavity formed by a housing or a partition. In particular, it can be seen in Figure 7 that the head has a shape with surfaces adjacent to the four inner surfaces of the cavity. In FIG. 7, the head of the resonator has surfaces adjacent to the four sides of the cavity and the upper and lower surfaces, so that very large capacitive coupling can be achieved. In addition, since the cross-section of the cavity is hexagonal, the length of the body can also be relatively long. In Figure 7, the cavity filter is formed in a pattern in which the body of each resonator in the plurality of filters 91 to 93 extends from adjacent corners and the head radiates outward. However, similar to the cavity filter in Figure 6, the cavity filter has a plurality of filters. In the filters 91 to 93, the body of each resonator may extend inward from the outer edge to form a pattern in which the head is concentrated inward.

Also, in the cavity filter of FIG. 7, it can be seen that the support 97 is formed in the direction where two or more partition walls 94 to 96 intersect.

Figures 8 and 9 show modified examples of the cavity filters of Figures 5 to 7.

The cavity filter shown in (a) to (c) of FIGS. 8 has basically the same structure as the cavity filter shown in FIGS. 5 to 7. However, in the cavity filter of FIG. 8, protrusions 108, 118, 126 protrude from the body side of the resonator of the adjacent filters (101, 104, (111, 114), (121, 123)) in the direction of the adjacent cavity. was further formed. These protrusions 108 and 118 are provided to form a stronger coupling between two adjacent filters. Here, protrusions 108, 118, and 126 are formed for cross coupling, and in some cases, as shown in FIG. 8, two filters adjacent to each other among the plurality of filters 101 to 104, 111 to 114, and 121 to 123 It may also have a structure in which the partition between them is removed.

The cavity filter shown in (a) to (c) of FIGS. 9 also has basically the same structure as the cavity filter shown in FIGS. 5 to 7. However, in the case of the cavity filters shown in FIGS. 5 to 7, the resonator heads of each filter (71 to 74, 81 to 84, and 91 to 93) intersect the partition walls (75 to 78, 85 to 88, and 94 to 96). It was formed in an outward direction radiating from the center, or formed in a central direction where it was all concentrated. However, as shown in FIG. 9, in the cavity filter of the embodiment, the resonator head directions of each filter (131 to 134, 141 to 144, and 151 to 153) can be formed completely independently of each other. For example, only the head direction of one filter 134 is set differently as shown in (a) and (c) of Figures 9, or the head directions of adjacent filters 141 to 144 are different as shown in (b). It may be set as follows. In addition, in the cavity filter of the embodiment, the head direction of each filter may be set in another direction not shown in FIG. 9.

10 and 11 show a cavity filter according to another embodiment.

FIG. 10 shows a cavity filter including a plurality of filters having a cavity with a pentagonal structure where the housing is formed in an arbitrary shape and a plurality of partition walls divide the interior of the housing. As shown in FIG. 10, in the cavity filter of the embodiment, the cross-sectional shape of the housing or the cross-sectional shape of the cavity divided by the partition can be changed in various ways, and the position or shape where the body and head of the resonator are formed can also be adjusted in various ways. It can be. In the cavity filter of FIG. 10, the input port and output port can be formed in two filters that can allow the applied signal to be transmitted through all filters among a plurality of filters. In some cases, it is necessary to clearly specify the path through which the signal is transmitted, and therefore, as shown in Figure 11, in addition to the partition wall, the housing itself may be formed with walls spaced apart from each other on the inside. As shown in FIG. 11, even when the cross-sectional shape of each filter is determined according to the shape structure of the housing itself rather than the partition wall, the resonator of the cavity filter can be used in the same way.

Although the present invention has been described in detail through representative embodiments above, those skilled in the art will understand that various modifications and other equivalent embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the attached claims.

Claims (20)

cavity; and
A cavity filter including a resonator formed to extend from one of the side edges of the cavity toward the inside of the cavity. The method of claim 1, wherein the resonator is
a body extending from a side edge of the cavity toward another inner edge or surface; and
A cavity filter including a head formed in the direction of two or more inner surfaces of the cavity at one end in the direction in which the body extends. The method of claim 2, wherein the body is
A cavity filter extending parallel to the lower surface of the cavity. The method of claim 2, wherein the body is
A cavity filter extending from one lateral edge of the cavity toward a diagonal edge. The method of claim 2, wherein the body is
Cavity filters formed in either a cylindrical or polygonal form. The method of claim 2, wherein the head
A cavity filter having two or more sides that are parallel to and coupled to each of two or more adjacent sides inside the cavity. The method of claim 2, wherein the head
A cavity filter whose cross-section is formed in a fan shape centered on one end of the body, and wherein an arc in the fan shape extends to a position adjacent to two or more adjacent sides within the cavity. The method of claim 7, wherein the cavity is
A cavity filter in which an inner edge at a position corresponding to the fan-shaped shape of the head is formed in an arc shape to form a plane parallel to the fan-shaped shape. The method of claim 2, wherein the head
A cavity filter in which the upper and lower surfaces are formed parallel to the upper and lower surfaces of the cavity, thereby achieving coupling. housing;
a plurality of cavities separated by at least one partition formed within the housing; and
A cavity filter comprising a plurality of resonators disposed in each of the plurality of cavities and extending in the inner direction of the cavity from one of the side edges of each cavity formed by the housing and the at least one partition. The method of claim 10, wherein the resonator is
a body extending from a side edge of the cavity toward another edge or surface of the cavity; and
A cavity filter including a head formed in the direction of two or more inner surfaces of the cavity at one end in the direction in which the body extends. 12. The method of claim 11, wherein at least one of the plurality of resonators is
A cavity filter in which the body extends from the edge most adjacent to the edge where the body of the resonator is formed in an adjacent cavity, and the head is formed in a direction away from the head of the adjacent resonator. 12. The method of claim 11, wherein at least one of the plurality of resonators is
A cavity filter in which the head is formed in the direction of the edge of the position closest to the head of the resonator formed in the adjacent cavity. 12. The method of claim 11, wherein at least one of the plurality of resonators is
A cavity filter whose head is formed in the direction of the edge closest to the edge where the body of the resonator formed in the adjacent cavity is formed. The cavity filter of claim 11, wherein each of the plurality of resonators disposed in adjacent cavities further has a protrusion protruding from a side of the body in the direction of the adjacent cavity. The method of claim 15, wherein the cavity filter
A cavity filter in which the partition wall is not formed between adjacent cavities in the direction in which the protrusion is formed. The method of claim 11, wherein the head
A cavity filter having two or more sides that are parallel to and coupled to each of two or more adjacent sides inside the cavity. The method of claim 11, wherein the head
A cavity filter whose cross-section is formed in a fan shape centered on one end of the body, and wherein an arc in the fan shape extends to a position adjacent to two or more adjacent sides within the cavity. The method of claim 11, wherein the head
A cavity filter in which the upper and lower surfaces are formed parallel to the upper and lower surfaces of the cavity, thereby achieving coupling. The method of claim 10, wherein the resonator is
The cavity filter is formed in a direction where two or more partition walls intersect each other, penetrating from the lower surface of the housing to the upper surface, and further includes a support to which a ground voltage is applied.