KR20220057445A - Ceramic waveguide filter for antenna - Google Patents

Abstract

The present invention relates to a ceramic waveguide filter for antennas. More specifically, the ceramic waveguide filter comprises: a housing including a plurality of resonance blocks made of a dielectric having a predetermined permittivity and partially partitioned by an inner barrier; a plurality of resonators functioning as a single resonator, respectively, by a plurality of resonator posts provided in the plurality of resonator blocks provided in the housing, respectively; an input porthole connected to an input port to input a signal to any one of the plurality of resonators; and an output porthole connected to an output port to output a signal from any one of the plurality of resonators. Any one of the input porthole and the output porthole has a notch structure bar, which extends toward the resonator post skipping the adjacently disposed resonator post among the plurality of resonator posts, integrally formed in the housing, thereby providing an advantage of facilitating a notch design of a passband.

Description

CERAMIC WAVEGUIDE FILTER FOR ANTENNA

The present invention relates to a ceramic waveguide filter for an antenna, and more particularly, to an input porthole to which an input port and an output port are connected or a ceramic waveguide for an antenna provided to enable cross-coupling between an output porthole and a resonator adjacent to it. It's about filters.

Recently, as the types of wireless communication services increase, the frequency environment is becoming more complex. Since a frequency for wireless communication is limited, there is a need to effectively utilize a frequency resource as close as possible to a wireless communication channel.

However, since signal interference occurs in an environment in which various wireless communication services are provided, the antenna includes a band filter for a specific 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 essential to apply a transmission zero (hereinafter, referred to as 'notch'), which is achieved by applying cross coupling between non-adjacent resonant elements. implement

Among RF filters, a ceramic waveguide filter includes a resonator for notch adjustment in a dielectric block surrounded by a conductive film. Resonators are designed to limit specific frequencies by giving resonant characteristics to electromagnetic waves.

At this time, when cross-coupling is performed across an even number of resonators, a symmetrical notch is generated in the passband, and when cross-coupling is performed across an odd number of resonators, one notch is generated on the left or right side depending on the type of coupling. It is common.

The notch implementation of the communication filter needs to be implemented in various ways depending on the performance of the communication system, but the performance is limited in implementing a filter suitable for the characteristics of the communication system.

Accordingly, it is necessary to set the filter differently depending on the communication system so that the notch can be implemented on the left and right sides of a specific passband in the antenna.

However, in the ceramic waveguide filter for an antenna according to the prior art, only the structure for realizing the left and right notch through the coupling between the resonator and the resonator is disclosed, so the design is very complicated. Since it is difficult to insert an additional structure, there is a problem in that it is difficult to design an effective coupling.

Republic of Korea Patent Registration No. 10-0836063 (2008.06.09. Announcement)

The present invention has been devised to solve the above technical problem, and by applying a structure capable of cross-coupling to any one of an input porthole and an output porthole to which an input port and an output port are connected, the characteristic of a specific passband is strengthened for an antenna It is an object to provide a ceramic waveguide filter.

Another object of the present invention is to provide a ceramic waveguide filter for an antenna in which a coupling design desired by a designer is possible without insertion of an additional structure for implementing cross-coupling in the filter.

The problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

The ceramic waveguide filter for an antenna according to an embodiment of the present invention configured as described above includes a housing including a plurality of resonant blocks provided with a dielectric material having a predetermined dielectric constant and partly partitioned by an inner barrier rib; A plurality of resonators each functioning as a single resonator by means of a plurality of resonator posts provided in each of the plurality of resonator blocks provided, an input port hole to which an input port is connected to input a signal to any one of the plurality of resonators, and the plurality of resonators and an output porthole to which an output port is connected so that a signal is output from any one of the plurality of resonator posts, and any one of the input portholes and the output portholes extends toward a resonator post that skips a resonator post disposed adjacently among the plurality of resonator posts A notch structure bar is integrally formed with the housing.

Here, the input porthole or the output porthole may be formed on the other surface opposite to one surface of the housing on which the plurality of resonator posts are formed, and the notch structure bar may extend in a horizontal direction.

In addition, the input porthole or the output porthole is formed on the other surface opposite to one surface of the housing on which the plurality of resonator posts are formed, and the notch structure bar is formed to extend in a horizontal direction, so as to be parallel to the bottom surface of the resonator post. A horizontal extension may be formed.

Also, the notch structure bar may be cut in a groove shape on the other surface opposite to one surface of the housing on which the plurality of resonator posts are formed, and may be machined to be smaller than the depth of the input porthole or the output porthole.

In addition, a notch dividing groove may be further processed and formed deeper than the depth of the input porthole or the output porthole from the front end of the notch structure bar.

In addition, a resonator post (hereinafter referred to as a 'corresponding post') formed on one surface of the housing corresponding to a resonance block corresponding to the input porthole or output porthole in which the notch structure bar is formed and a resonator post adjacent to the corresponding post (hereinafter referred to as a 'corresponding post') , 'adjacent posts') may be partitioned by an outer barrier rib formed on a sidewall of the housing together with the inner barrier rib.

In addition, depending on the depth of the resonator post (hereinafter, referred to as 'corresponding post') formed on one surface of the housing corresponding to the resonance block corresponding to the input porthole or the output porthole, the height of the entire frequency may be supplemented.

In addition, when the depth of the corresponding post is relatively deep based on the depth of the resonator post (hereinafter, referred to as 'adjacent post') adjacent to the corresponding post, the total frequency is equal to the difference in depth between the corresponding post and the adjacent post. It can be supplemented to go down.

In addition, when the depth of the corresponding post becomes relatively shallow based on the depth of the resonator post (hereinafter, referred to as an 'adjacent post') adjacent to the corresponding post, the total depth of the corresponding post and the adjacent post is equal to the depth difference. It can be supplemented to increase the frequency.

In addition, the type of notch implemented on the left or right side of the passband during frequency filtering may be different depending on the presence or absence of the notch dividing groove.

In addition, the notch structure bar and the input port hole or the output port hole may form a coating film coated with a metal material.

In addition, the notch structure bar may be partitioned by an unplated part to prevent an electrical short between the input porthole or the output porthole and a coating film coated on the outer surface of the housing.

In addition, the front end of the notch structure bar and the notch dividing groove is at least provided with a resonator post (hereinafter, referred to as a 'first resonator post') disposed adjacently among the plurality of resonator posts. A resonant block (hereinafter referred to as a 'second resonator block') provided with a resonator post skipping the first resonator post (hereinafter referred to as a 'second resonator post') is mutually partitioned. It may extend further to the side of the second resonator post than the partition wall.

According to the ceramic waveguide filter for an antenna according to the present invention, cross-coupling can be implemented through a notch structure bar and a notch dividing groove extending from either the input porthole or the output porthole, so that the resonance design inside the housing is easy. have

1 is a perspective view showing a ceramic waveguide filter for an antenna according to the present invention;
2 is a perspective view of various embodiments showing the direction of the other surface of the housing in which the notch structure bar or the notch dividing groove is formed in the configuration of FIG. 1;
3 is a perspective view of an upper surface and a lower surface of a ceramic waveguide filter for an antenna according to an embodiment of the present invention;
Figure 4 is a projection plan view showing one surface and the other surface of the housing of Figure 3,
5 is a cross-sectional view showing a notch structure bar in the configuration of FIG. 3,
Figure 6 is a perspective view of Figure 5,
7 is a graph showing the frequency characteristics of a ceramic waveguide filter for an antenna according to an embodiment of the present invention and a circuit configuration diagram thereof;
8 is a perspective view of an upper surface and a lower surface of a ceramic waveguide filter for an antenna according to another embodiment of the present invention;
9 is a projection plan view showing one surface and the other surface of the housing of FIG. 8;
10 is a cross-sectional view showing a notch structure bar in the configuration of FIG.
11 is a perspective view of FIG. 10;
12 is a graph showing frequency characteristics of a ceramic waveguide filter for an antenna according to another embodiment of the present invention and a circuit configuration diagram thereof.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the art to which the present invention pertains It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout.

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

1 is a perspective view showing a ceramic waveguide filter for an antenna according to the present invention, and FIG. 2 is a perspective view of various embodiments showing the direction of the other surface of the housing in which the notch structure bar or the notch dividing groove is formed in the configuration of FIG. 1 .

The communication antenna includes a filter for filtering a signal of a specific passband. A cavity filter, a waveguide filter, etc. may be used as the filter according to characteristics, but in the embodiment of the present invention, the ceramic waveguide filter 100 using a ceramic dielectric among the waveguide filters provided in the antenna will be mainly described.

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

In general, the ceramic waveguide filter 100 includes at least four or more resonance blocks, and for example, 4 to 20 resonance blocks may be provided in the housing 110 constituting one filter. The ceramic waveguide filter 100 for an antenna according to the present invention will be described with reference to FIG. 1 , as an example in which six resonant blocks are provided and each resonator post 121 to 126 is provided one by one in each resonant block.

In the ceramic waveguide filter 100 for an antenna according to the present invention, six resonant blocks are formed in one housing 110 made of a ceramic dielectric, and each resonant block has an inner partition wall 131, a part of which will be described later. Alternatively, it may be divided by the outer partition wall 132 .

The inside of each resonant block is filled with a dielectric material, and ceramic or air may be used as the dielectric material, but other dielectric materials may also be used. In the ceramic waveguide filter 100 for an antenna according to the present invention, the dielectric material will be limited to a ceramic material.

In addition, the outer surface of the one (ie, single) housing 110 may be formed entirely of a coating film coated with a metal material. That is, the ceramic waveguide filter 100 has the entire outer surface of the coating part completely blocked except for the input porthole 141 or the output porthole 142, which will be described later, from the electrical signal transmission to the inside and outside of the housing 110. , the signal passing through the input porthole 141 and the output porthole 142 may be filtered in a state in which the signal from the outside is blocked by the coating part inside the housing 110 .

Each of the plurality of resonant blocks operates as one resonator, and the ceramic waveguide filter 100 composed of six resonators may be formed through the six resonator blocks.

On the other hand, each resonator block may be provided with one resonator post (121 to 126). The resonator posts 121 to 126 may be provided in a form in which a dielectric different from the dielectric constant of the ceramic material forming the resonance block is sandwiched. In general, since air is a type of dielectric having a predetermined dielectric constant, air can also be a material constituting the resonator posts 121 to 126, and when it is assumed that the resonator posts 121 to 126 have the dielectric constant of air Each of the resonator posts 121 to 126 may be formed in the form of an empty space in which a part of each resonator block is removed.

Hereinafter, for convenience of description, each of the resonator posts 121 to 126 will be described on the premise that they are provided in a hollow shape into which a dielectric having a dielectric constant of air is inserted. The case of the inner partition wall 131 and the outer partition wall 132, which will be described later, should be interpreted in the same way.

If each of the resonator posts 121 to 126 is air, it means that the resonator posts 121 to 126 are provided in the form of an empty space in the housing 110 in a cut or deleted form, and each of the resonator posts 121 to 126 has a predetermined dielectric constant. When provided with a dielectric, it means that the shape of each of the resonator posts 121 to 126 is inserted into the housing 110 .

The resonator posts 121 to 126 may be provided on one surface (upper surface) or the other surface (lower surface) of the housing 110 constituting each resonance block. Here, the precise meaning that the resonator posts 121 to 126 are provided on one surface and the other surface of the housing 110 means that the outer surface of each resonator post 121 to 126 is the outer surface (one surface or the other surface) of the housing 110 and It can be defined as being provided inside the housing 110 to match.

Meanwhile, when the first resonator post 121 is installed on one surface (upper surface) of the first resonator block, the other resonator posts 122 to 126 may also be installed on one surface (upper surface) of each resonator block. That is, the outer surfaces of all the resonator posts 121 to 126 may be provided to match one surface (upper surface) of the housing 110 .

When each of the resonator posts 121 to 126 is made of air having a predetermined dielectric constant, it means that they are installed on one surface (upper surface) or the other surface (lower surface) of the housing 110 , meaning that each opening direction is one surface of the housing 110 . It means that it is formed to be opened toward the (upper surface) or the other surface (lower surface).

The first to sixth resonator blocks are coupled to the first to sixth resonator posts 121 to 126 and operate as independent resonators, respectively. Accordingly, six of the first to sixth resonators may be formed in one housing 110 .

An inner barrier rib 131 or an outer barrier rib 132 may be formed between each resonant block, and the size and resonance characteristics of each resonant block may vary depending on the size (width, length) and location of each of the barrier ribs 131 and 132. can

In the ceramic waveguide filter 100 for an antenna according to the present invention, as a wall, as shown in FIGS. 1 and 2 , an inner barrier rib 131 and an outer barrier rib 132 may be included.

The inner partition wall 131 is, for example, assuming that the exterior of the housing 110 is formed in a hexahedral shape having a rectangular cross-section formed long in the longitudinal direction, from the middle part of one end in the longitudinal direction to the middle part of the other end in the longitudinal direction (that is, The other end in the longitudinal direction is cut to be close to the center), and may be formed to have a '+' shape by extending a predetermined length orthogonally to the width direction in at least two places.

The outer partition wall 132 is one side of the housing 110 to mutually partition the resonance block provided with the first resonator post 121 and the second resonator post 122 on which a notch structure bar 141a, which will be described later, is formed. An incision may be formed at a predetermined depth from the end to the inside.

Here, as a resonator post (for example, the first resonator post 121) formed in the resonance block corresponding to the input porthole 141 or the output porthole 142 in which the notch structure bar 141a to be described later is formed, hereinafter referred to as a 'corresponding post' As described above, a portion between the corresponding post 121 and the adjacent resonator post (eg, the second resonator post 122 , hereinafter referred to as an 'adjacent post') is partially formed by the inner partition wall 131 . In addition to being partitioned, it may be partitioned by the outer partition wall 132 formed on the sidewall of the housing 110 .

In more detail, for example, if it is assumed that a total of six resonance blocks are provided, the inner partition wall 131 is a structure entirely involved in physically partitioning each resonance block, whereas the outer partition wall 132 will be described later. It may be a structure that is only involved in partitioning between the resonant blocks that are cross-coupled to implement C-coupling or L-coupling.

3 is a perspective view of the upper and lower surfaces of the ceramic waveguide filter for an antenna according to an embodiment of the present invention, FIG. 4 is a projection plan view showing one surface and the other surface of the housing of FIG. 3 , and FIG. 5 is the configuration of FIG. 6 is a perspective view of FIG. 5, and 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.

As shown in FIGS. 3 to 7 , the ceramic waveguide filter 100a for an antenna according to an embodiment of the present invention is provided with a dielectric material having a predetermined permittivity, and is partially partitioned by an inner partition wall 131 . A plurality of resonators each functioning as a single resonator by a housing 110a including a plurality of resonator blocks, and a plurality of resonator posts 121 to 126 provided in the plurality of resonator blocks provided in the housing 110a, respectively; An input port hole 141 to which an input port (not shown) is connected to input a signal to any one of the plurality of resonators, and an output port hole 142 to which an output port (not shown) is connected to output a signal from any one of the plurality of resonators. ) may be included.

Here, either the input porthole 141 or the output porthole 142 is the most adjacently disposed resonator post among the plurality of resonator posts 121 to 126 (for example, the first resonator post indicated by 121 (corresponding post)) The notch structure bar 141a extending toward the skipped resonator post (eg, the second resonator post (adjacent post) indicated by 122) may be integrally formed with the housing 110a. The ceramic waveguide filter 100a for an antenna according to an embodiment of the present invention will be described by limiting that the notch structure bar 141a is extended from the input porthole 141 .

The notch structure bar 141a is formed to extend from the input porthole 141, and as shown in FIG. 7 at the time of the signal input step, the first resonator post 121 is skipped and the second resonator post 122 is formed with Signal coupling (C-coupling or L-coupling) can be implemented between them.

Here, the input porthole 141 or the output porthole 142 is formed on the other surface of the housing 110a corresponding to one surface and the opposite surface on which the plurality of resonator posts 121 to 126 are formed, and the notch structure bar 141a is , may be formed to extend in a horizontal direction.

In more detail, the notch structure bar 141a, as shown in FIG. 3 , is formed to extend in the horizontal direction, and is horizontally parallel to the bottom surface of the resonator post (ie, the second resonator post (adjacent post) 122). It can be formed by extension.

Here, the notch structure bar 141a is cut in a groove shape on one surface and the opposite surface of the housing 110a in which the plurality of resonator posts 121 to 126 are formed, and the input porthole 141 or the output porthole 142. Incision processing can be formed smaller than the depth of.

In addition, the ceramic waveguide filter 100a for an antenna according to an embodiment of the present invention, as shown in FIGS. 3 to 6 , an input porthole 141 or an output porthole 142 from the front end of the notch structure bar 141a ), the notch dividing groove 141b may be further processed to be deeper than the depth.

The notch dividing groove 141b is formed to be closer to the bottom surface (ie, the bottom surface) of the second resonator post (adjacent post, 122) than the front end of the notch structure bar 141a, and the notch dividing groove 141b is provided. In this case, a C-coupling may be implemented between the input porthole 141 and the second resonator post 122 , and as shown in FIG. 7 , a C-notch is formed at the left end of the passband. can be formed.

Here, the notch dividing groove 141b performs a function of making the depth of the tip of the notch structure bar 141a relatively different, and the depth of the tip of the notch structure bar 141a is shown in FIGS. 3 to 6 As referenced, when formed relatively deep, as the relative separation distance between the notch dividing groove 141b and the second resonator post (adjacent post, 122) is small, the above-described C-notch C-couple is formed. A ring may be implemented.

Conversely, in the case of a ceramic waveguide filter 100b for an antenna according to another embodiment of the present invention described later, which is not provided with a notch dividing groove 141b, the tip of the notch structure bar 141b and the second resonator post ( As the relative spacing between adjacent posts 122 is large, an L-coupling for the formation of an L-notch rather than a C-notch can be implemented.

Here, the ceramic waveguide filter 100a for an antenna according to an embodiment of the present invention is a characteristic element distinguishing it from the ceramic waveguide filter 100b for an antenna according to another embodiment of the present invention to be described later, and a notch structure bar 141a ) may be determined by whether or not the notch dividing groove (141b) is additionally formed.

Whether the notch dividing groove 141b is additionally formed (that is, whether implemented in one embodiment or another embodiment) is determined by the physical separation distance from the input porthole 141 to the second resonator post (adjacent post, 122). By making them different, it becomes an important factor that can determine the length so as to have any one of the electrical properties of inductance or capacitance.

More specifically, in the case of the ceramic waveguide filter 100a for an antenna according to an embodiment of the present invention including the notch dividing groove 141b, the notch division located close to the second resonator post (adjacent post, 122) An electric-field (E-field) is physically formed between the second resonator posts 122 by the groove 141b to implement a C-notch according to capacitive coupling on the left side of the passband.

Conversely, in the case of the ceramic waveguide filter 100b for an antenna according to another embodiment of the present invention in which the notch dividing groove 141b is not provided, the front end of the notch structure bar 141a is relatively spaced apart from the second resonator 122 . Therefore, a magnetic-field (H-field) is physically formed between the second resonator posts 122 to implement an L-notch according to inductive coupling on the right side of the passband.

As such, in embodiments of the present invention, the type of notch implemented on the left or right side of the pass band may be different during frequency filtering depending on the presence or absence of the notch dividing groove 141b.

In order to facilitate the implementation of the cross coupling as described above, at least the front end of the notch structure bar 141a or the notch dividing groove 141b includes a first resonator block having a first resonator post (corresponding post, 121) and a second resonator block. It is preferable to have a length extending to the second resonator post (adjacent post, 122) side than the outer bulkhead 132 formed to separate the second resonator block provided with the second resonator post (adjacent post, 122). When the front end of the notch structure bar 141a or the notch dividing groove 141b is further spaced apart from the second resonator post (adjacent post, 122) than the outer partition wall 132 (that is, the first resonator post (corresponding post, 121) This is because cross-coupling through the window from which the outer barrier rib 132 is removed is not easy in the case where the length extended from the outer barrier rib 132 is not extended.

On the other hand, the notch structure bar 141a and the input porthole 141 or the output porthole 142 may form a coating film coated with a metal material. The coating part here can be understood as the same concept as the coating part formed over the entire outer surface of the housing 110a.

That is, in the notch structure bar 141a and the notch dividing groove 141b, a coating portion may be formed on both inner surfaces of the resonator posts 121 to 126 as if a metal material was plated on the inner surface.

Here, the notch structure bar 141a and the notch dividing groove 141b are formed to prevent an electrical short between the input port hole 141 or the output port hole 142 and the coating film plated on the outer surface of the housing 110a. It may be partitioned by the unplated part 143 . It is sufficient to understand that the unplated portion 143 is a concept that collectively refers to a portion that is not plated, unlike the coating portion.

The notch structure bar 141a and the notch dividing groove 141b and the second resonator post 122 are separated by the unplated part 143, which is separated from the coating part. It is also possible to design.

For example, as in the ceramic waveguide filter 100a for an antenna according to an embodiment of the present invention, a coating portion is formed on the inner surface of the notch structure bar 141a and the notch dividing groove 141b, but the notch structure bar ( The unplated portion 143 may be formed only around the input porthole 141 to which 141a) is connected, and as in the ceramic waveguide filter 100b for an antenna according to another embodiment of the present invention, the input porthole 141 and the notch It is also possible to form the unplated portion 143 to include all of the structure bar (141a).

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

In the ceramic waveguide filter 100b for an antenna according to another embodiment of the present invention, as shown in FIGS. 8 to 12 , the notch dividing groove 141b is not formed at the front end of the notch structure bar 141a. can be defined as

That is, the ceramic waveguide filter 100b for an antenna according to another embodiment of the present invention extends in the horizontal direction from either the input porthole 141 or the output porthole 142, as shown in FIGS. 8 to 11 . The ceramic waveguide filter for an antenna according to an embodiment of the present invention is formed, horizontally extending parallel to the bottom surface of the second resonator post 122, which is an adjacent post, and the above-described notch dividing groove 141b is not formed. A relative separation distance between the front end of the notch structure bar 141a and the second resonator post 122 may be greater than 100a.

Here, as described above, the front end of the notched structure bar 141a has a first resonance block and a second cross-coupling between the front end of the notched structure bar 141a and the second resonator post 122 . It is preferable to extend further toward the second resonator post 122 than the barrier ribs 132 formed to separate the resonator blocks.

On the other hand, as shown in FIGS. 5 and 10 , ceramic waveguide filters 100a and 100b for antennas according to an embodiment (see FIG. 5 ) and another embodiment (see FIG. 10 ) of the present invention have an input porthole ( 141) or the depth of the corresponding post, which is a resonator post formed on one surface of the housing 110 corresponding to the resonance block corresponding to the output porthole 142, may compensate for the height of the entire frequency.

In particular, in the case of the embodiments 100a and 100b of the present invention, as the structure of the notch structure bar 141a and the notch division groove 141b is additionally formed in the housing 110, the originally designed overall frequency increases or decreases. As a result, the changed frequency can be supplemented by adjusting the depth shape of the first resonator post 121, which is the corresponding post.

More specifically, when the depth of the first resonator post 121, which is the corresponding post, is relatively deep based on the depth of the second resonator post 122, which is the adjacent post, it is adjacent to the first resonator post 121, which is the corresponding post. It may be supplemented so that the total frequency is lowered by the depth difference of the post-in second resonator post 122 .

Conversely, if the depth of the first resonator post 121, which is the corresponding post, is relatively shallow based on the depth of the second resonator post 122, which is the adjacent post, the corresponding post, the first resonator post 121, and the adjacent post, the second resonator post 121 It may be supplemented so that the overall frequency increases by the depth difference of the two resonator posts 122 .

On the other hand, when the notch dividing groove 141b is not formed at the front end of the notch structure bar 141a, as shown in FIG. 12 , the L-couple between the input porthole 141 and the second resonator post 122 . According to the implementation of the ring, an L-notch is formed at the right end of the passband, so that the frequency characteristic can be strengthened.

As described above, the embodiments 100a and 100b of the ceramic waveguide filter for an antenna according to the present invention include a notch structure bar 141a or a notch dividing groove 141b extending from the input porthole 141 or the output porthole 142 . ), it is possible to implement different couplings, simplify the structural design of the resonator posts 121 to 126, as well as increase productivity and reliability of the product because there is no need to insert an additional structure into the housing 110 It offers significant improvements.

Even though all components constituting the embodiment of the present invention are described as being combined and operated as one, the present invention is not necessarily limited to this embodiment. Within the scope of the present invention, all components may operate by selectively combining one or more according to embodiments.

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

100,100a,100b: ceramic waveguide filter 110a,110b: housing
121 to 126: resonator post 131: inner partition wall
132: outer bulkhead 141: input porthole
141a: notch structure bar 141b: notch division groove
142: output porthole

Claims (13)

a housing comprising a plurality of resonant blocks provided with a dielectric material having a predetermined dielectric constant and partially partitioned by an inner barrier rib;
a plurality of resonators each functioning as a single resonator by a plurality of resonator posts provided on each of the plurality of resonator blocks provided in the housing; and
an input port hole to which an input port is connected to input a signal to any one of the plurality of resonators and an output port hole to which an output port is connected to output a signal from any one of the plurality of resonators; including,
In any one of the input porthole and the output porthole, a notch structure bar extending toward a resonator post that skips an adjacently disposed resonator post among the plurality of resonator posts is integrally formed with the housing. The method according to claim 1,
The input porthole or the output porthole is formed on the other surface opposite to one surface of the housing on which the plurality of resonator posts are formed,
The notch structure bar is formed to extend in a horizontal direction, a ceramic waveguide filter for an antenna. The method according to claim 1,
The input porthole or the output porthole is formed on the other surface opposite to one surface of the housing on which the plurality of resonator posts are formed,
The notch structure bar is formed to extend in a horizontal direction, the ceramic waveguide filter for an antenna is formed to extend horizontally in parallel with the bottom surface of the resonator post. 4. The method according to claim 2 or 3,
The notch structure bar is cut in a groove shape on the other surface opposite to one surface of the housing on which the plurality of resonator posts are formed, and is formed to be smaller than a depth of the input porthole or the output porthole, ceramic waveguide filter for antenna. 5. The method according to claim 4,
A ceramic waveguide filter for an antenna, wherein a notch dividing groove is further processed to be deeper than the depth of the input porthole or the output porthole from the tip of the notch structure bar. The method according to claim 1,
A resonator post (hereinafter, referred to as a 'corresponding post') formed on one surface of the housing corresponding to a resonance block corresponding to the input porthole or output porthole in which the notch structure bar is formed, and a resonator post adjacent to the corresponding post (hereinafter, ' A ceramic waveguide filter for an antenna, which is partitioned between the adjacent posts (referred to as 'adjacent posts') by an outer partition formed on a side wall of the housing together with the inner partition. 6. The method of claim 5,
Ceramic waveguide filter for antenna, in which the height of the entire frequency is supplemented according to the depth of the resonator post (hereinafter referred to as 'corresponding post') formed on one surface of the housing corresponding to the resonance block corresponding to the input porthole or the output porthole. 8. The method of claim 7,
When the depth of the corresponding post is relatively deep based on the depth of the resonator post (hereinafter, referred to as 'adjacent post') adjacent to the corresponding post, the total frequency decreases by the depth difference between the corresponding post and the adjacent post. Ceramic waveguide filter for antenna 8. The method of claim 7,
When the depth of the corresponding post becomes relatively shallow based on the depth of the resonator post (hereinafter referred to as 'adjacent post') adjacent to the corresponding post, the total frequency increases by the difference in depth between the corresponding post and the adjacent post. Ceramic waveguide filter for antenna 6. The method of claim 5,
A ceramic waveguide filter for an antenna, wherein the type of notch implemented on the left or right side of the passband is different during frequency filtering according to the presence or absence of the notch dividing groove. The method according to claim 1,
The ceramic waveguide filter for an antenna, wherein the notch structure bar and the input porthole or the output porthole form a coating film coated with a metal material. The method according to claim 1,
The notch structure bar is partitioned by an unplated part to prevent an electrical short between the input porthole or the output porthole and a coating part coated on the outer surface of the housing by an unplated part. 6. The method of claim 5,
The front end of the notch structure bar and the notch dividing groove is at least a resonant block (hereinafter, referred to as a 'first resonator post') provided with a resonator post (hereinafter, referred to as a 'first resonator post') disposed adjacently among the plurality of resonator posts. 'block') and a resonator post (hereinafter, referred to as a 'second resonator post') that skips the first resonator post (hereinafter referred to as a 'second resonator post') and a partition wall that mutually partitions the resonant block (hereinafter referred to as a 'second resonator block') A ceramic waveguide filter for an antenna, extending further to the side of the second resonator post.

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