CN116802928A - Ceramic waveguide filter for antenna - Google Patents

Abstract

The present invention relates to a ceramic waveguide filter for an antenna, and in particular, includes: a housing formed of a dielectric having a dielectric constant, including a plurality of resonance blocks partially divided by an internal partition; a plurality of resonators each functioning as a single resonator by a plurality of resonator columns provided to a plurality of resonator blocks, the plurality of resonator blocks being provided to the housing; and an input port hole and an output port hole, wherein the input port hole is connected to the input port so as to input a signal to one of the resonators, the output port hole is connected to the output port so as to output a signal to one of the resonators, and a notch structure strip extending toward a resonator column extending beyond a resonator column adjacently arranged among the resonator columns is formed integrally with the housing in one of the input port hole and the output port hole, whereby a notch design of a passband is easily performed.

Description

Ceramic waveguide filter for antenna

Technical Field

The present invention relates to a ceramic waveguide filter for an antenna, and more particularly, to a ceramic waveguide filter for an antenna capable of realizing cross coupling between resonators adjacent to an input port hole or an output port hole connected to an input port and an output port.

Background

Recently, as the variety of wireless communication services increases, the frequency environment becomes complex. The frequencies used for wireless communication are limited and, therefore, there is a need to efficiently utilize frequency resources that are as close as possible to the wireless communication channel.

However, signal interference may occur in an environment where various wireless communication services are provided, and thus, an antenna includes a band filter for a specific frequency band in order to minimize signal interference between adjacent frequency resources.

In general, in order to improve the attenuation characteristics of the band filter, it is necessary to employ a transmission zero (transmission zero, hereinafter referred to as a "notch"), which is achieved by employing cross coupling (cross coupling) between resonance devices that are not adjacent.

In the RF filter, the ceramic waveguide filter includes a resonator for adjusting the notch in a dielectric block covered with a conductor film around. The resonator is designed to limit a specific frequency by imparting resonance characteristics to electromagnetic waves.

In this case, generally, if cross-coupling is performed by an even number of resonators, left-right symmetric notch of the passband is generated, and if cross-coupling is performed by a single number of resonators, 1 notch is generated on the left or right side depending on the kind of coupling.

The notch implementation of such a communication filter should be implemented in various ways depending on the performance of the communication system, but the performance will be limited in terms of implementing a filter suitable for the characteristics of the communication system.

Thus, in the antenna, it is necessary to set filters differently according to the communication system so that notch can be implemented in the left and right of a specific passband.

However, the conventional ceramic waveguide filter for an antenna only discloses a structure for realizing left and right notches by coupling between a resonator and a resonator, and the structure is very complicated, while it is difficult to insert a structure added for realizing cross coupling into the filter, and it is difficult to perform efficient coupling design.

Disclosure of Invention

Technical problem

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a ceramic waveguide filter for an antenna, which has a structure capable of cross-coupling with one of an input port hole and an output port hole, thereby enhancing characteristics of a specific passband, the input port hole and the output port hole being connected to an input port and an output port.

It is still another object of the present invention to provide a ceramic waveguide filter for an antenna, which can design a coupling required by a designer without inserting an additional structure for realizing cross coupling into the filter.

The technical problems of the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned can be clearly understood by those skilled in the art to which the present invention pertains through the following descriptions.

Technical proposal

The ceramic waveguide filter for an antenna according to an embodiment of the present invention as described above includes: a housing formed of a dielectric having a dielectric constant, including a plurality of resonance blocks partially divided by an internal partition; a plurality of resonators each functioning as a single resonator by a plurality of resonator columns provided to a plurality of resonator blocks, the plurality of resonator blocks being provided to the housing; and an input port hole and an output port hole, wherein the input port hole is connected to the input port so as to input a signal to one of the plurality of resonators, the output port hole is connected to the output port so as to output a signal to one of the plurality of resonators, and a notch structure strip extending toward a resonator column extending beyond a resonator column adjacently arranged among the plurality of resonator columns is integrally formed in one of the input port hole and the output port hole in the housing.

The input port hole or the output port hole may be formed in the other surface opposite to the one surface of the housing in which the plurality of resonator columns are formed, and the notch structure bar may extend in a horizontal direction.

The input port hole or the output port hole may be formed on the other surface opposite to the one surface of the housing on which the plurality of resonator columns are formed, and the notch structure strip may be formed to extend in a horizontal direction so as to extend horizontally parallel to the ground surface of the resonator column.

The notch structure bar may be formed by cutting a groove on the other surface of the housing opposite to the one surface on which the plurality of resonator columns are formed, and may be formed to have a depth smaller than the depth of the input port hole or the output port hole.

Further, a notch dividing groove may be formed to have a depth greater than a depth from the front end portion of the notch structural bar to the input port hole or the output port hole.

A space between a resonator column (hereinafter, referred to as a "corresponding column") formed on one surface of the housing corresponding to the input port hole or the resonance block corresponding to the output port hole in which the notch structure bar is formed and a resonator column (hereinafter, referred to as an "adjacent column") adjacent to the corresponding column may be partitioned by the inner partition plate and an outer partition plate formed on a side wall of the housing.

The difference in the overall frequency can be compensated for by the depth of a resonator column (hereinafter referred to as a "corresponding column") formed on one surface of the housing corresponding to the input port hole or the resonance block corresponding to the output port hole.

When the depth of the corresponding column is relatively increased based on the depth of a resonator column (hereinafter, referred to as an "adjacent column") adjacent to the corresponding column, the entire frequency is reduced by an amount corresponding to the difference between the depths of the corresponding column and the adjacent column.

When the depth of the corresponding column becomes relatively shallow based on the depth of a resonator column (hereinafter, referred to as an "adjacent column") adjacent to the corresponding column, the entire frequency is increased to a level corresponding to the difference between the depth of the corresponding column and the depth of the adjacent column.

Also, depending on whether or not the notch dividing slot is present, the types of notches formed on the left or right side of the pass band may be different when the frequencies are filtered.

The notch structure bar, the input port hole or the output port hole can form a film part made of a coated metal material.

The notch structure strip may be divided by an unplated portion in order to prevent a short circuit with the input port hole or the output port hole and the film portion coated on the outer surface of the housing.

The notch structural bar and the tip of the notch dividing groove may extend at least further toward the second resonator column side than a partition plate in which a resonator block (hereinafter, referred to as a "first resonator block") formed by adjacently disposing a plurality of the resonator columns (hereinafter, referred to as a "first resonator column") and a resonator block (hereinafter, referred to as a "second resonator block") formed by crossing the resonator column (hereinafter, referred to as a "second resonator column") of the first resonator column are partitioned from each other.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the ceramic waveguide filter for an antenna of the present invention, the present invention has an effect that cross coupling can be achieved by the notch structure bars and the notch dividing grooves extending from one of the input port hole or the output port hole, and thus, resonance design inside the housing is easy.

Drawings

Fig. 1 is a perspective view showing a ceramic waveguide filter for an antenna according to the present invention.

FIG. 2 is a perspective view of a projection showing various embodiments of the structure of FIG. 1 in another orientation of the housing forming the slot structure bars or slot-dividing slots.

Fig. 3 is a perspective view showing upper and lower faces of a ceramic waveguide filter for an antenna according to an embodiment of the present invention.

Fig. 4 is a plan view showing one side and the other side of the housing of fig. 3.

Fig. 5 is a cross-sectional view showing a notch structural bar in the structure of fig. 3.

Fig. 6 is a perspective view of fig. 5.

Fig. 7 is a graph showing frequency characteristics of a ceramic waveguide filter for an antenna according to an embodiment of the present invention and a circuit configuration diagram thereof.

Fig. 8 is a perspective view showing upper and lower faces of a ceramic waveguide filter for an antenna according to another embodiment of the present invention.

Fig. 9 is a plan view showing one side and the other side of the housing of fig. 8.

Fig. 10 is a cross-sectional view showing a notch structural bar in the structure of fig. 8.

Fig. 11 is a perspective view of fig. 10.

Fig. 12 is a graph and a circuit configuration diagram showing frequency characteristics of a ceramic waveguide filter for an antenna according to another embodiment of the present invention.

Description of the reference numerals

100. 100a, 100b: ceramic waveguide filters 110a, 110b: outer cover

121 to 126: resonator column 131: internal partition

132: outer partition 141: input port hole

141a: notch structural bar 141b: notch dividing groove

142: output port hole

Detailed Description

The advantages, features and methods of accomplishing the same may be more apparent by reference to the embodiments described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be embodied in various forms, and the present embodiment completes the disclosure of the present invention and is not provided to fully inform the scope of the present invention to those ordinarily skilled in the art. The invention is defined by the scope of the claims. Throughout the specification, like reference numerals refer to like structural elements.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 is a perspective view showing a ceramic waveguide filter for an antenna of the present invention, and fig. 2 is a perspective view showing various embodiments of the other surface direction of a housing in which notch structure bars or notch dividing grooves are formed in the structure of fig. 1.

The communication antenna includes a filter for filtering signals of a specific passband. The filter may be a cavity filter, a waveguide filter, or the like, and in the embodiment of the present invention, the description will be centered on the ceramic waveguide filter 100 using a dielectric made of a ceramic material, which is a waveguide filter provided in an antenna.

As shown in fig. 1, the ceramic waveguide filter 100 for an antenna of the present invention includes a plurality of resonance blocks (not shown).

Typically, the ceramic waveguide filter 100 includes at least 4 resonator blocks, and 4 to 20 resonator blocks may be provided in the housing 110 constituting one filter. As shown in fig. 1, the ceramic waveguide filter 100 for an antenna according to the present invention is constituted by 6 resonator blocks, and a single resonator column 121 to 126 is provided in each resonator block.

In the ceramic waveguide filter 100 for an antenna of the present invention, 6 resonator blocks are formed in one housing 110 made of a dielectric material, and a part of each resonator block is divided by an internal partition 131 or an external partition 132 described later.

The dielectric material is filled in each resonator block, and ceramic or air can be used as the dielectric material, or other dielectric materials can be used. In the ceramic waveguide filter 100 for an antenna according to the present invention, the dielectric material is defined as a ceramic material.

Meanwhile, the outer surface of one (i.e., a single) housing 110 may be integrally formed with a thin film portion coated with a metal material. That is, in the ceramic waveguide filter 100, the entire outer surface is completely shielded from the electric signal transmission to the inside or outside of the housing 110 through the thin film portion except for the input port hole 141 or the output port hole 142 described later, and the signals passing through the input port hole 141 and the output port hole 142 can be filtered in a state where the signals are shielded from the outside through the thin film portion inside the housing 110.

The plurality of resonator blocks each operate as one resonator, and the ceramic waveguide filter 100 including 6 resonators can be formed by the 6 resonator blocks.

On the other hand, one resonator column 121 to 126 may be provided at each resonator mass. The resonator columns 121 to 126 may be formed by inserting a dielectric material having a dielectric constant different from that of the ceramic material forming the resonator mass. In general, air is one of dielectrics having a predetermined dielectric constant, and may be a material constituting the resonator columns 121 to 126, and when the dielectric constant of the resonator columns 121 to 126 is assumed to be that of air, the resonator columns 121 to 126 may be formed in a space shape in which a part of each resonator is removed.

Hereinafter, for convenience of explanation, the resonator columns 121 to 126 will be described on the premise that they are formed in a hollow shape in which a dielectric having a dielectric constant of air is interposed. The same explanation will be made for the case of the inner separator 131 and the outer separator 132 described later.

When the resonator columns 121 to 126 are air, the cover 110 is cut or removed in an empty space, and when the resonator columns 121 to 126 are formed of a dielectric having a predetermined dielectric constant, the resonator columns 121 to 126 are inserted into the cover 110.

The resonator columns 121 to 126 may be formed on one surface (upper surface) or the other surface (lower surface) of the housing 110 constituting each resonator mass. The resonator columns 121 to 126 are formed on one surface and the other surface of the housing 110 in such a precise meaning that the outer surfaces of the resonator columns 121 to 126 are formed inside the housing 110 so as to match the outer surfaces (one surface or the other surface) of the housing 110.

On the other hand, in the case where the first resonator column 121 is provided on one surface (upper surface) of the first resonator mass, the other resonator columns 122 to 126 may be provided on one surface (upper surface) of each resonator mass. That is, the outer surfaces of all the resonator columns 121 to 126 may be disposed on one surface (upper surface) of the housing 110 in a matching manner.

When each of the resonator columns 121 to 126 is formed of air having a predetermined dielectric constant, the meaning of being provided on one surface (upper surface) or the other surface (lower surface) of the housing 110 is that each opening direction is formed to be open to one surface (upper surface) or the other surface (lower surface) of the housing 110.

The first to sixth resonator masses are combined with the first to sixth resonator pillars 121 to 126 and operate as independent resonators, respectively. Thus, 6 first to sixth resonators and the like can be formed in one housing 110.

An inner diaphragm 131 or an outer diaphragm 132 may be formed between the respective resonance blocks, and the size and resonance characteristics of the respective resonance blocks may be changed according to the size (width, length) and position of the respective diaphragms 131, 132.

In the ceramic waveguide filter 100 for an antenna of the present invention, as shown in fig. 1 and 2, the partition (wall) may include an inner partition 131 and an outer partition 132.

In the case where the outer cover 110 has a hexahedral shape with a rectangular cross section formed long in the longitudinal direction, the inner partition 131 is cut so as to be close to the intermediate portion of the other end in the longitudinal direction (i.e., the intermediate portion of the other end in the longitudinal direction) from the intermediate portion of one end in the longitudinal direction, and extends a predetermined length orthogonal to the longitudinal direction at least at 2 points to have a "+" shape.

In particular, the outer partition 132 may be formed by cutting a fixed depth from one side end portion of the housing 110 to the inside to divide the resonator mass having the first resonator column 121 and the second resonator column 122 formed with notch structural bars 141a described later from each other.

As described above, the space between the resonator pillar (hereinafter, referred to as "corresponding pillar") of the resonator block corresponding to the input port hole 141 or the output port hole 142 in which the notch structure bar 141a described later is formed and the resonator pillar (hereinafter, referred to as "adjacent pillar") adjacent to the corresponding pillar 121 (hereinafter, referred to as "second resonator pillar 122") may be partially divided by the inner partition plate 131 and at the same time, divided by the outer partition plate 132 formed on the side wall of the housing 110.

More specifically, if the number of resonator blocks is 6, the inner partition 131 is a structure that physically divides each resonator block, and the outer partition 132 is a structure that divides between resonator blocks that are cross-coupled for implementation of C-coupling or L-coupling, which will be described later.

Fig. 3 is a perspective view showing an upper surface and a lower surface of a ceramic waveguide filter for an antenna according to an embodiment of the present invention, fig. 4 is a plan view showing one surface and the other surface of the housing of fig. 3, fig. 5 is a cross-sectional view showing notch structure bars in the structure of fig. 3, fig. 6 is a perspective view of fig. 5, and fig. 7 is a graph showing frequency characteristics of the ceramic waveguide filter for an antenna according to an embodiment of the present invention and a circuit configuration thereof.

As shown in fig. 3 to 7, the ceramic waveguide filter 100a for an antenna according to an embodiment of the present invention may include: a housing 110a formed of an electrolyte having a prescribed dielectric constant, and partially divided by an internal separator 131; a plurality of resonators each functioning as a single resonator by a plurality of resonator columns 121 to 126 formed in a plurality of resonator blocks formed in the housing 110 a; an input port hole 141 connected to an input port (not shown) so as to input a signal to one of the resonators; and an output port hole 142 connected to an output port (not shown) so as to output a signal from one of the resonators.

In one of the input port hole 141 and the output port hole 142, a notch structure bar 141a extending toward a resonator pillar (a second resonator pillar (an adjacent pillar) indicated by 122) extending beyond a resonator pillar (a first resonator pillar (a corresponding pillar) indicated by 121) disposed nearest to the plurality of resonator pillars 121 to 126 is integrally formed in the housing 110a. In the ceramic waveguide filter 100a for an antenna according to an embodiment of the present invention, a notch structure bar 141a is defined to extend from the input port hole 141.

As shown in fig. 7, notch structure bars 141a are formed extending from the input port holes 141, and coupling (C-coupling or L-coupling) can be achieved between the second resonator pillars 122 crossing the first resonator pillars 121 at the input step time point of the signal.

The input port hole 141 or the output port hole 142 is formed in the other surface of the housing 110a, and the other surface of the housing 110a corresponds to the surface opposite to the surface on which the plurality of resonator columns 121 to 126 are formed, and the notch structure bar 141a may extend in the horizontal direction.

In more detail, as shown in fig. 3, the notch structural bars 141a may be extended in a horizontal direction, and the bottom surfaces of the resonator pillars (i.e., the second resonator pillars (adjacent pillars), 122) are extended horizontally in a parallel manner.

Wherein the notch structural bar 141a may be formed by slit-cutting in a groove shape at one surface and the opposite surface of the outer cover 110a where the plurality of resonator columns 121 to 126 are formed, and the depth thereof may be made smaller than the depth of the input port hole 141 or the output port hole 142.

Meanwhile, as shown in fig. 3 to 6, the ceramic waveguide filter 100a for an antenna according to an embodiment of the present invention may further be processed to form notch dividing grooves 141b having a depth greater than a depth from the front end portion of the notch structural bar 141a to the input port hole 141 or the output port hole 142.

The notch dividing groove 141b is closer to the bottom surface (i.e., the ground) of the second resonator column 122 (adjacent column) than the front end of the notch structural bar 141a, and when the notch dividing groove 141b is provided, C coupling (coupling) can be achieved between the input port hole 141 and the second resonator column 122, and as shown in fig. 7, a C notch can be formed at the left side end of the pass band.

Among them, the notch dividing groove 141b may perform a function of making the depths of the front end portions of the notch structural bars 141a relatively different, and as shown in fig. 3 to 6, when the depths of the front end portions of the notch structural bars 141a are relatively deep, C coupling forming the above-described C notch may be achieved as the relative separation distance between the notch dividing groove 141b and the second resonator post 122 (adjacent post) is small.

In contrast, in the case of the ceramic waveguide filter 100b for an antenna of another embodiment of the present invention as described later without forming the notch dividing grooves 141b, L coupling for forming L notches can be achieved instead of C notches as the relative distance of separation between the front ends of the notch structural bars 141b and the second resonator posts 122 (adjacent posts) is relatively large.

The ceramic waveguide filter 100a for an antenna according to an embodiment of the present invention may be defined by whether or not notch dividing grooves 141b are additionally formed in the notch structural bars 141a as a characteristic element to be distinguished from the ceramic waveguide filter 100b for an antenna according to another embodiment of the present invention described later.

Whether or not the notch dividing groove 141b is additionally formed (i.e., whether or not it is implemented in one embodiment) is an element that varies the physical separation distance from the input port hole 141 to the adjacent post of the second resonator post 122, thereby determining the length so as to have one of the inductive (or capacitive) electrical characteristics.

In more detail, in the case of the ceramic waveguide filter 100a for an antenna according to an embodiment of the present invention including the notch dividing grooves 141b, an Electric-field (E-field) is physically formed between the second resonator pillars 122 by the notch dividing grooves 141b formed adjacent to the second resonator pillars 122 (adjacent pillars), so that a C notch based on capacitive coupling can be formed at the left side of the pass band.

In contrast, in the case of the ceramic waveguide filter 100b for an antenna of another embodiment of the present invention in which the notch dividing grooves 141b are not formed, the front ends of the notch structural bars 141a are spaced relatively apart from the second resonator 122, and thus, an electric field (H-field) is magnetically formed between the second resonator pillars 122, so that an L notch based on inductive coupling can be implemented on the right side of the pass band.

As described above, in the various embodiments of the present invention, the kinds of notch formed at the left or right side of the pass band may be different when filtering frequencies according to whether the notch dividing slot 141b described above is present.

In order to easily achieve the above cross coupling, it is preferable that the notch structural bar 141a or the front end of the notch dividing groove 141b is formed with a length extending more toward the second resonator column 122 (adjacent column) side than the external partition 132 formed in such a manner as to divide the first resonator block formed with the first resonator column 121 (corresponding column) and the second resonator block formed with the second resonator column 122 (adjacent column). In the case where the front ends of the notch structural bars 141a or the notch dividing grooves 141b are further spaced apart from the second resonator pillar 122 (adjacent pillar) than the outer partition 132 (i.e., in the case where the length extending from the first resonator pillar 121 (corresponding pillar) does not extend beyond the outer partition 132), it is not easy to achieve cross coupling by removing the window of the outer partition 132. On the other hand, the notch structural bar 141a and the input port hole 141 or the output port hole 142 may form a plating portion plating a metal material. Here, the film portion may be understood as a concept of a film portion formed on the entire outer surface of the outer cover 110a.

That is, the notch structural bar 141a and the notch dividing groove 141b may have thin film portions formed on the inner surfaces, as in the case of plating metal on the inner surfaces on which the resonator columns 121 to 126 are formed.

The notch structure bar 141a and the notch dividing groove 141b may be divided by the unplated portion 143 in order to prevent short-circuiting with the thin film portion plated on the outer surface of the input port hole 141, the output port hole 142, or the housing 110a. Unlike the thin film portion, the unplated portion 143 is understood to be a concept of a portion that is not subjected to plating treatment.

By the unplated portion 143 partitioned from the thin film portion, 2 notch characteristics of short circuit (short) and open coupling can be designed between the notch structure bar 141a and the notch dividing groove 141b and the second resonator column 122.

For example, as in the ceramic waveguide filter 100a for an antenna according to one embodiment of the present invention, a thin film portion may be formed on the inner surfaces of the notch structural bar 141a and the notch dividing groove 141b, and the unplated portion 143 may be formed only on the peripheral portion of the input port hole 141 connected to the notch structural bar 141a, and as in the ceramic waveguide filter 100b for an antenna according to another embodiment of the present invention, the unplated portion 143 may be formed so as to include both the input port hole 141 and the notch structural bar 141 a.

Fig. 8 is a perspective view showing an upper surface and a lower surface of a ceramic waveguide filter for an antenna according to another embodiment of the present invention, fig. 9 is a plan view showing one surface and the other surface of the housing of fig. 8, fig. 10 is a cross-sectional view showing notch structure bars in the structure of fig. 8, fig. 11 is a perspective view of fig. 10, and fig. 12 is a graph showing frequency characteristics of the ceramic waveguide filter for an antenna according to another embodiment of the present invention and a circuit configuration thereof.

As shown in fig. 8 to 12, the ceramic waveguide filter 100b for an antenna according to another embodiment of the present invention may be defined as an embodiment in which the notch dividing grooves 141b are not formed at the front end portions of the notch structural bars 141 a.

That is, in the ceramic waveguide filter 100b for an antenna according to another embodiment of the present invention, as shown in fig. 8 to 11, the notch dividing groove 141b is not formed by extending from one of the input port hole 141 and the output port hole 142 in the horizontal direction so as to extend horizontally parallel to the front face of the second resonator pillar 122 that is the adjacent pillar, and thus the distance between the front end of the notch structural bar 141a and the second resonator pillar 122 is larger than that of the ceramic waveguide filter 100a for an antenna according to the first embodiment of the present invention.

In this case, as described above, the front end of the notch structural bar 141a is preferably extended further toward the second resonator post 122 than the partition 132 formed to distinguish the first resonator block from the second resonator block, so that cross coupling between the front end of the notch structural bar 141a and the second resonator post 122 is easily achieved.

On the other hand, as shown in fig. 5 and 10, in the ceramic waveguide filters 100a and 100b for antennas according to one embodiment (see fig. 5) and the other embodiment (see fig. 10) of the present invention, the difference in the overall frequency can be compensated according to the depth of the corresponding column as the resonator column formed on the one surface of the housing 110 corresponding to the input port hole 141 or the resonance block corresponding to the output port hole 142.

In particular, in the case of the embodiments 100a, 100b of the present invention, as the notch structural bars 141a and the notch dividing grooves 141b are additionally formed in the housing 110, the overall frequency of the initial design is increased or decreased, and the frequency changed as above can be complemented by the depth shape adjustment of the first resonator pillars 121 as the corresponding pillars.

In more detail, when the depth of the first resonator column 121, which is the corresponding column, is relatively deep with reference to the depth of the second resonator column 122, which is the adjacent column, the entire frequency is reduced by a degree corresponding to the difference in depth between the first resonator column 121, which is the corresponding column, and the second resonator column 122, which is the adjacent column, is complemented.

In contrast, when the depth of the first resonator column 121 as the corresponding column is relatively shallower based on the depth of the second resonator column 122 as the adjacent column, the entire frequency is increased to be complementary to the depth difference between the first resonator column 121 as the corresponding column and the second resonator column 122 as the adjacent column.

On the other hand, when the notch dividing groove 141b is not formed at the front end portion of the notch structural bar 141a, as shown in fig. 12, as the L coupling between the input port hole 141 and the second resonator column 122 is achieved, an L notch is formed at the right end of the pass band, whereby the frequency characteristic can be enhanced.

As described above, in the embodiments 100a and 100b of the ceramic waveguide filter for an antenna according to the present invention, the notch structure bars 141a or the notch dividing grooves 141b extending from the input port hole 141 or the output port hole 142 can be coupled differently, and the structural design of the plurality of resonator columns 121 to 126 can be simplified, and it is not necessary to insert additional structures into the housing 110, so that productivity and reliability of the product can be greatly improved.

The description has been made in such a manner that all the constituent elements constituting the embodiment of the present invention are combined into one to operate, but the present invention is not limited to such an embodiment. Within the object of the present invention, according to the embodiment, the structural elements may also be selectively combined into one or more operations.

The above description is merely illustrative of the technical idea of the present invention, and various modifications and variations can be made by those skilled in the art to which the present invention pertains without departing from the essential characteristics of the present invention.

Industrial applicability

The present invention provides a ceramic waveguide filter for an antenna, which is configured to be cross-coupled with one of an input port hole and an output port hole, thereby enhancing characteristics of a specific passband, the input port hole and the output port hole being connected to an input port and an output port.

Claims (13)

1. A ceramic waveguide filter for an antenna is characterized in that,

comprising the following steps:

a housing formed of a dielectric having a dielectric constant, including a plurality of resonance blocks partially divided by an internal partition;

a plurality of resonators each functioning as a single resonator by a plurality of resonator columns provided to a plurality of resonator blocks, the plurality of resonator blocks being provided to the housing; and

an input port hole connected to the input port so as to input a signal to one of the plurality of resonators, and an output port hole connected to the output port so as to output a signal from one of the plurality of resonators,

in one of the input port hole and the output port hole, a notch structure strip extending toward a resonator column extending beyond a resonator column adjacently arranged among the plurality of resonator columns is formed integrally with the housing.

2. The ceramic waveguide filter for an antenna according to claim 1, wherein,

the input port hole or the output port hole is formed in the other surface opposite to the one surface of the housing in which the plurality of resonator columns are formed,

the notch structural strip extends along the horizontal direction.

3. The ceramic waveguide filter for an antenna according to claim 1, wherein,

the input port hole or the output port hole is formed in the other surface opposite to the one surface of the housing in which the plurality of resonator columns are formed,

the notch structure strip is formed to extend in a horizontal direction and to extend horizontally parallel to the ground of the resonator column.

4. The ceramic waveguide filter for an antenna according to claim 2 or 3, wherein the notch structure strip is cut out in a groove shape on the other surface opposite to the one surface of the housing on which the plurality of resonator posts are formed, and is formed to have a depth smaller than that of the input port hole or the output port hole.

5. The ceramic waveguide filter for an antenna according to claim 4, wherein notch dividing grooves are further processed to have a depth larger than a depth from a front end portion of the notch structural bar to the input port hole or the output port hole.

6. The ceramic waveguide filter for an antenna according to claim 1, wherein a space between a corresponding pillar formed on one surface of the housing corresponding to the resonance block corresponding to the input port hole or the output port hole in which the notch structure bar is formed and an adjacent pillar adjacent to the corresponding pillar is divided by the inner partition and an outer partition formed on a side wall of the housing.

7. The ceramic waveguide filter for an antenna according to claim 5, wherein the difference in overall frequency is compensated for in accordance with the depth of a corresponding column formed on one surface of the housing corresponding to the input port hole or the resonance block corresponding to the output port hole.

8. The ceramic waveguide filter for an antenna according to claim 7, wherein when the depth of the corresponding pillar is relatively deep based on the depth of an adjacent pillar adjacent to the corresponding pillar, the entire frequency is reduced by an amount corresponding to a difference between the depths of the corresponding pillar and the adjacent pillar.

9. The ceramic waveguide filter for an antenna according to claim 7, wherein when the depth of the corresponding pillar is relatively shallower based on the depth of an adjacent pillar adjacent to the corresponding pillar, the entire frequency is increased by an amount corresponding to a difference between the depths of the corresponding pillar and the adjacent pillar.

10. The ceramic waveguide filter for an antenna according to claim 5, wherein the types of notch formed on the left or right side of the passband are different when filtering the frequency, depending on whether the notch dividing groove is present.

11. The ceramic waveguide filter for an antenna according to claim 1, wherein the notch structure bar, the input port hole, or the output port hole is formed as a thin film portion made of a plating metal.

12. The ceramic waveguide filter for an antenna according to claim 1, wherein the notch structure bars are divided by an unplated portion in order to prevent a short circuit with a film portion plated on the outer surface of the housing and the input port hole or the output port hole.

13. The ceramic waveguide filter for an antenna according to claim 5, wherein the notch structural bar and the tip end of the notch dividing groove extend at least further toward the second resonator column side than a partition plate that divides a first resonator block formed with a first resonator column adjacent to the plurality of resonator columns and a second resonator block formed with a second resonator column crossing the first resonator column.