Patent Publication Number: US-11387564-B2

Title: Cavity filter and antenna module including the same

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
     This application is based on and claims priority under 35 U.S.C. § 119(a) of a Korean patent application number 10-2019-0008412, filed on Jan. 22, 2019, in the Korean Intellectual Property Office, the disclosure of which is incorporated by reference herein in its entirety. 
     BACKGROUND 
     1. Field 
     The disclosure relates to a cavity filter of a surface mount device (SMD) type mountable on a printed circuit board (PCB). 
     2. Description of Related Art 
     To meet the demand for wireless data traffic having increased since deployment of 4G communication systems, efforts have been made to develop an improved 5G or pre-5G communication system. Therefore, the 5G or pre-5G communication system is also called a ‘Beyond 4G Network’ or a ‘Post LTE System’. The 5G communication system is considered to be implemented in higher frequency (mmWave) bands, e.g., 60 GHz bands, so as to accomplish higher data rates. To decrease propagation loss of the radio waves and increase the transmission distance, the beamforming, massive multiple-input multiple-output (MIMO), Full Dimensional MIMO (FD-MIMO), array antenna, an analog beam forming, large scale antenna techniques are discussed in 5G communication systems. In addition, in 5G communication systems, development for system network improvement is under way based on advanced small cells, cloud Radio Access Networks (RANs), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, moving network, cooperative communication, Coordinated Multi-Points (CoMP), reception-end interference cancellation and the like. In the 5G system, Hybrid FSK and QAM Modulation (FQAM) and sliding window superposition coding (SWSC) as an advanced coding modulation (ACM), and filter bank multi carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA) as an advanced access technology have been developed. 
     The Internet, which is a human centered connectivity network where humans generate and consume information, is now evolving to the Internet of Things (IoT) where distributed entities, such as things, exchange and process information without human intervention. The Internet of Everything (IoE), which is a combination of the IoT technology and the Big Data processing technology through connection with a cloud server, has emerged. As technology elements, such as “sensing technology”, “wired/wireless communication and network infrastructure”, “service interface technology”, and “Security technology” have been demanded for IoT implementation, a sensor network, a Machine-to-Machine (M2M) communication, Machine Type Communication (MTC), and so forth have been recently researched. Such an IoT environment may provide intelligent Internet technology services that create a new value to human life by collecting and analyzing data generated among connected things. IoT may be applied to a variety of fields including smart home, smart building, smart city, smart car or connected cars, smart grid, health care, smart appliances and advanced medical services through convergence and combination between existing Information Technology (IT) and various industrial applications. 
     In line with this, various attempts have been made to apply 5G communication systems to IoT networks. For example, technologies such as a sensor network, Machine Type Communication (MTC), and Machine-to-Machine (M2M) communication may be implemented by beamforming, MIMO, and array antennas. Application of a cloud Radio Access Network (RAN) as the above-described Big Data processing technology may also be considered to be as an example of convergence between the 5G technology and the IoT technology. 
     In a 5G mobile communication system, a plurality of cavity filters may be included in one antenna module. That is, the assemblability of cavity filters may affect the performance of an antenna module. 
     The above information is presented as background information only to assist with an understanding of the disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with regard to the disclosure. 
     SUMMARY 
     Aspects of the disclosure are to address at least the above-mentioned problems and/or disadvantages and to provide at least the advantages described below. Accordingly, an aspect of the disclosure is to provide a cavity filter structure that can improve the performance of an antenna module. 
     Additional aspects will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the presented embodiments. 
     In accordance with an aspect of the disclosure, a cavity filter is provided. The cavity filter includes a plate of the cavity filter and including a feeder part for supplying an electrical signal, a housing forming an exterior of the cavity filter and coupled to the plate to form a shielded space inside the cavity filter, and a metal structure having a first end coupled to an inside of the housing and a second end that extends toward the feeder part and resonates to filter frequencies in the shielded space. 
     In accordance with another aspect of the disclosure, a cavity filter is provided. The cavity filter includes a plate of the cavity filter and including a feeder part for supplying an electrical signal, a housing forming an exterior of the cavity filter and coupled to the plate to form a shielded space inside the cavity filter, and a metal structure having a first coupled to an inside of the housing and a second end that extends toward the feeder part, wherein a conductive region is formed on a surface of the plate facing the metal structure to generate a resonance and filter frequencies of a signal. 
     In accordance with yet another aspect of the disclosure, an antenna module including a cavity filter configured to filter frequencies is provided. The cavity filter includes a plate including a feeder part for supplying an electrical signal, a housing forming an exterior of the cavity filter and coupled to the plate to form a shielded space inside the cavity filter, and a metal structure having a first end coupled to an inside of the housing and a second end extends toward the feeder part and resonates to filter the frequencies in the shielded space. 
     In accordance with yet another aspect of the disclosure, an antenna module including a cavity filter configured to filter frequencies is provided. The cavity filter includes a plate including a feeder part for supplying an electrical signal, a housing forming an exterior of the cavity filter and coupled to the plate to form a shielded space inside the cavity filter, and a metal structure having a first end coupled to an inside of the housing and a second end extends toward the feeder part to filter frequencies in the shielded space, wherein a conductive region is formed on a surface of the plate facing the metal structure to generate a resonance and filter frequencies of a signal. 
     According to an embodiment of the disclosure, the ability to assemble and mass produce cavity filters can be improved. In addition, the characteristics of a cavity filter can be easily controlled. 
     Other aspects, advantages, and salient features of the disclosure will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses various embodiments of the disclosure. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other aspects, features and advantages of certain embodiments of the disclosure will be more apparent from the following description, taken in conjunction with the accompanying drawings, in which: 
         FIG. 1  is a view showing a cavity filter structure according to the related art; 
         FIG. 2A  is a side view of a cavity filter according to an embodiment of the disclosure; 
         FIG. 2B  is a top view of the cavity filter according to an embodiment of the disclosure; 
         FIG. 2C  is a bottom view of the cavity filter according to an embodiment of the disclosure; 
         FIG. 3  is a side view of a cavity filter according to an embodiment of the disclosure; 
         FIG. 4A  is a side view of a cavity filter according to an embodiment of the disclosure; 
         FIG. 4B  illustrates a printed circuit board (PCB) used for a cavity filter according to an embodiment of the disclosure; and 
         FIG. 5  is a side view of a cavity filter according to an embodiment of the disclosure. 
     
    
    
     Throughout the drawings, like reference numerals will be understood to refer to like parts, components, and structures. 
     DETAILED DESCRIPTION 
     The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of various embodiments of the disclosure as defined by the claims and their equivalents. It includes various specific details to assist in that understanding but these are to be regarded as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the various embodiments described herein can be made without departing from the scope and spirit of the disclosure. In addition, descriptions of well-known functions and constructions may be omitted for clarity and conciseness. 
     The terms and words used in the following description and claims are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of the disclosure. Accordingly, it should be apparent to those skilled in the art that the following description of various embodiments of the disclosure is provided for illustration purpose only and not for the purpose of limiting the disclosure as defined by the appended claims and their equivalents. 
     It is to be understood that the singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to “a component surface” includes reference to one or more of such surfaces. 
     In the drawings, some elements are exaggerated, omitted, or only outlined in brief, and thus may be not drawn to scale. The same or similar reference symbols are used throughout the drawings to refer to the same or like parts. 
     The aspects, features, and advantages of certain embodiments of the disclosure will be more apparent from the following detailed description taken in conjunction with the accompanying drawings. The description of the various embodiments is to be construed as exemplary only and does not describe every possible instance of the disclosure. It should be apparent to those skilled in the art that the following description of various embodiments of the disclosure is provided for illustrative purposes only and not for the purpose of limiting the disclosure as defined by the appended claims and their equivalents. The same reference symbols are used throughout the description to refer to the same parts. 
     Meanwhile, it is known to those skilled in the art that blocks of a flowchart (or sequence diagram) and a combination of flowcharts may be represented and executed by computer program instructions. These computer program instructions may be loaded on a processor of a general purpose computer, special purpose computer, or programmable data processing equipment. When the loaded program instructions are executed by the processor, the instructions create a means for carrying out functions described in the flowchart. As the computer program instructions may be stored in a computer readable or computer usable memory that is usable in a computer or a programmable data processing equipment to implement functionality in a particular manner, the instructions stored in a computer readable or computer usable memory are also possible to create articles of manufacture containing instruction means that carry out functions described in the flowchart block(s). As the computer program instructions may be loaded on a computer or other programmable data processing equipment, the instructions, that perform a computer or other programmable data processing equipment by creating a computer-implemented process on a computer or other programmable data processing equipment, may carry out operations of functions described in the flowchart block(s). 
     Each block of a flowchart may correspond to a module, a segment or a code containing one or more executable instructions for implementing a specified logical function, or to a part thereof. In some cases, functions described by blocks may be executed in an order different from the listed order. For example, two blocks listed in sequence may be executed at the same time or executed in reverse order. 
     In the description, the word “unit”, “module”, or the like may refer to a software component or hardware component such as a field-programmable gate array (FPGA) or application specific integrated circuit (ASIC) and “unit” or the like is capable of carrying out a function or an operation. However, “unit” or the like is not limited to hardware or software. A unit or the like may be configured so as to reside in an addressable storage medium or to drive one or more processors. Units or the like may refer to software components, object-oriented software components, class components, task components, processes, functions, attributes, procedures, subroutines, program code segments, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, or variables. A function provided by components and units may be a combination of smaller number of components and units, and it may be separated into additional components and units. Components and units may be configured to drive a device or one or more central processing units (CPUs) in a secure multimedia card. In one embodiment, a unit or module may include one or more processors. 
       FIG. 1  is a view showing a cavity filter structure according to the related art. 
     Referring to  FIG. 1 , a cavity filter  100  may include a cover  110  constituting one surface of the cavity filter  100 , and a housing  120  coupled to the cover  110  to form the exterior of the cavity filter  100 . In various embodiments, a closed space may be formed inside the cavity filter  100  by the cover  110  and the housing  120 . 
     In one embodiment, the cavity filter  100  may include at least one metal structure  150 ,  151 ,  152 ,  153 , or  154  to determine filter characteristics. In various embodiments, the characteristics (e.g., capacitance value) of the cavity filter may be determined based on the sizes and locations of the metal structures  150 ,  151 ,  152 ,  153 , and  154 . The at least one metal structure  150 ,  151 ,  152 ,  153 , or  154  may be coupled to the cover  110  through bolts. 
     In one embodiment, the cavity filter  100  may be coupled to one surface of a printed circuit board (PCB)  140 . In various embodiments, a separate auxiliary PCB  130  may be required to surface mount radio frequency (RF) pins  160  and  161  on the PCB  140 . 
     In one embodiment, two holes may be formed in one surface of the housing  120  to accommodate the RF pins  160  and  161 . In various embodiments, the characteristics (e.g., inductance value) of the cavity filter may be determined by electrically connecting and controlling the RF pins  160  and  161  to the at least one metal structure  150 ,  151 ,  152 ,  153 , or  154 . 
     In one embodiment, the holes of the housing  120  through which the RF pins  160  and  161  pass may include an auxiliary material for fixing the RF pins  160  and  161 . In various embodiments, this auxiliary material may be deformed by high temperature heat during the processing of the cavity filter  100 . 
       FIG. 2A  is a side view of a cavity filter according to an embodiment of the disclosure. 
     Referring to  FIG. 2A , in one embodiment, a cavity filter  200  may include a plate  220  constituting one surface of the cavity filter  200 , and a housing  210  that constitutes the exterior of the cavity filter and is coupled to the plate  220  to form a shielded space inside the cavity filter. In various embodiments, the plate  220  may be made of a nonmetallic material. For example, the plate  220  may be a PCB. 
     In one embodiment, at least one metal structure  241  or  242  may be disposed on one surface of the housing  210 . In various embodiments, the at least one metal structure  241  or  242  may be spaced apart by a preset distance from the plate  220 . 
     In one embodiment, a feeder part  230  may be included in the plate  220 . In various embodiments, when an electrical signal is supplied to the feeder part  230 , a capacitance component may be generated between the feeder part  230  and the metal structure  241 . In one embodiment, the capacitance component generated between the feeder part  230  and the metal structure  241  may be determined based on the spacing between the feeder part  230  and the metal structure  241  or the area of an overlapping region between the feeder part  230  and the metal structure  241 . 
     In one embodiment, at least one control bolt  251  or  252  may be disposed in one surface of the housing  210 . In various embodiments, the control bolts  251  and  252  may be arranged to correspond respectively to the metal structures and may control magnetic fields generated through the metal structures by changing the lengths of the corresponding metal structures. For example, the first control bolt  251  corresponding to the first metal structure  241  may control the value of the inductance due to the first metal structure  241 , and the second control bolt  252  corresponding to the second metal structure  242  may control the value of the inductance due to the second metal structure  242 . 
     In one embodiment, the plate  220  may be coupled to one surface of a PCB. For example, the cavity filter  200  may be surface mounted on the PCB through the plate  220 . In various embodiments, a conductive pattern  260  may be formed on the plate  220  to transmit an electrical signal (e.g., RF signal) to the PCB. 
       FIG. 2B  is a top view of the cavity filter according to an embodiment of the disclosure. 
     Referring to  FIG. 2B , the cavity filter may correspond to the case where the cavity filter of  FIG. 2A  is viewed from above. More specifically,  FIG. 2B  shows the cavity filter seen transparently from above. 
     In one embodiment, the first metal structure  241  and the second metal structure  242  may be disposed on one surface of the housing  210  of the cavity filter. In various embodiments, the feeder part  230  may be spaced apart by a preset distance from the bottom surface of the first metal structure  241 . 
     In one embodiment, the first metal structure  241  and the feeder part  230  may have an overlapping region when viewed from above the cavity filter. In various embodiments, the capacitance component of the cavity filter may be determined based on the area of the overlapping region between the first metal structure  241  and the feeder part  230  or the distance between the first metal structure  241  and the feeder part  230 . 
       FIG. 2C  is a bottom view of the cavity filter according to an embodiment of the disclosure. 
     Referring to  FIG. 2C , in one embodiment, the feeder part  230  may be disposed at a side portion of the plate  220 . In various embodiments, the side portion of the plate  220  may be coupled to the PCB. In one embodiment, the feeder part  230  may receive an electrical signal from the PCB coupled with the side portion of the plate  220 . 
     Meanwhile,  FIGS. 2A, 2B, and 2C  illustrate one embodiment of the disclosure. Hence, the scope of the disclosure should not be limited to the structure shown in  FIGS. 2A, 2B, and 2C . 
       FIG. 3  is a side view of a cavity filter according to an embodiment of the disclosure. 
     Referring to  FIG. 3 , in one embodiment, the cavity filter  300  may include a plate  320  constituting one surface of the cavity filter  300 , and a housing  310  that constitutes the exterior of the cavity filter and is coupled to the plate  320  to form a shielded space inside the cavity filter. In various embodiments, the plate  320  may be made of a nonmetallic material. For example, the plate  320  may be a PCB. 
     In one embodiment, at least one metal structure  341  or  342  may be disposed on one surface of the housing  310 . In various embodiments, the at least one metal structure  341  or  342  may be coupled to one surface of the housing  310  through bolts  351  and  352 . For example, the first metal structure  341  may be coupled to the housing  310  through the first bolt  351 , and the second metal structure  342  may be coupled to the housing  310  through the second bolt  352 . In one embodiment, the at least one metal structure  341  or  342  may be spaced apart by a preset distance from the plate  320 . 
     In one embodiment, a feeder part  330  may be included in the plate  320 . In various embodiments, when an electrical signal is supplied to the feeder part  330 , a capacitance component may be generated between the feeder part  330  and the metal structure  341 . In one embodiment, the capacitance component generated between the feeder part  330  and the metal structure  341  may be determined based on the spacing between the feeder part  330  and the metal structure  341  or the area of an overlapping region between the feeder part  330  and the metal structure  341 . 
     In one embodiment, at least one control bolt  361  or  362  may be disposed in one surface of the housing  310 . In various embodiments, the control bolts  361  and  362  may be arranged to correspond respectively to the metal structures and may control magnetic fields generated through the metal structures by changing the lengths of the corresponding metal structures. For example, the first control bolt  361  corresponding to the first metal structure  341  may control the value of the inductance due to the first metal structure  341 , and the second control bolt  362  corresponding to the second metal structure  342  may control the value of the inductance due to the second metal structure  342 . 
     In one embodiment, the plate  320  may be coupled to one surface of a PCB. For example, the cavity filter  300  may be surface mounted on the PCB through the plate  320 . In various embodiments, a conductive pattern  370  may be formed on the plate  320  to transmit an electrical signal (e.g., RF signal) to the PCB. 
       FIG. 4A  is a side view of a cavity filter according to an embodiment of the disclosure. 
     Referring to  FIG. 4A , in one embodiment, the cavity filter  400  may include a plate  420  constituting one surface of the cavity filter  400 , and a housing  410  that constitutes the exterior of the cavity filter and is coupled to the plate  420  to form a shielded space inside the cavity filter. In various embodiments, the plate  420  may be made of a nonmetallic material. For example, the plate  420  may be a PCB. 
     In one embodiment, at least one metal structure  471  or  472  may be disposed on one surface of the housing  410 . In various embodiments the at least one metal structure  471  or  472  may be coupled to a PCB  440  having a function of a resonator. In one embodiment, the PCB  440  may be spaced apart by a preset distance from the plate  420 . 
     In one embodiment, in the PCB  440 , a first metal region  441  may be disposed at a portion corresponding to the first metal structure  471 , and a second metal region  442  may be disposed at a portion corresponding to the second metal structure  472 . The PCB  440  will be described in more detail later with reference to  FIG. 4B . 
     In one embodiment, a feeder part  430  may be included in the plate  420 . In various embodiments, when an electrical signal is supplied to the feeder part  430 , a capacitance component may be generated between the feeder part  430  and the PCB  440 . In one embodiment, the capacitance component generated between the feeder part  430  and the PCB  440  may be determined based on the spacing between the feeder part  430  and the PCB  440  or the area of an overlapping region between the feeder part  430  and the PCB  440 . 
     In one embodiment, at least one control bolt  451  or  452  may be disposed in one surface of the housing  410 . In various embodiments, the control bolts may be arranged to correspond respectively to the metal structures and may control magnetic fields generated through the metal structures by changing the lengths of the corresponding metal structures. For example, the first control bolt  451  corresponding to the first metal structure  471  may control the value of the inductance due to the first metal structure  471 , and the second control bolt  452  corresponding to the second metal structure  472  may control the value of the inductance due to the second metal structure  472 . 
     In one embodiment, the plate  420  may be coupled to one surface of a PCB. For example, the cavity filter  400  may be surface mounted on the PCB through the plate  420 . In various embodiments, a conductive pattern  460  may be formed on the plate  420  to transmit an electrical signal (e.g., RF signal) to the PCB. 
       FIG. 4B  illustrates a PCB used for a cavity filter according to an embodiment of the disclosure. 
     Referring to  FIG. 4B , in one embodiment, in a PCB  440  coupled to the metal structures  471  and  472  formed inside the cavity filter, a first metal region  441  and a second metal region  442  may be formed at positions corresponding to the metal structures. In various embodiments, the first metal structure  471  may be electrically connected to the first metal region  441 , and the second metal structure  472  may be electrically connected to the second metal region  442 . 
     In one embodiment, the PCB  440  including the first metal region  441  and the second metal region  442  may be coupled with the first metal structure  471  and the second metal structure  472  through soldering or the like. In  FIG. 4B , only the case where the first metal region  441  and the second metal region  442  are formed in a circular shape is illustrated, but the scope of the disclosure should not be limited thereto. For example, the first metal region  441  and the metal region  442  may have various shapes such as a rectangle and a triangle. 
       FIG. 5  is a side view of a cavity filter according to an embodiment of the disclosure. 
     Referring to  FIG. 5 , in one embodiment, the cavity filter  500  may include a plate  520  constituting one surface of the cavity filter  500 , and a housing  510  that constitutes the exterior of the cavity filter and is coupled to the plate  520  to form a shielded space inside the cavity filter. The plate  520  may be made of a nonmetallic material. For example, the plate  520  may be a PCB. 
     In one embodiment, at least one metal structure  541  or  542  may be disposed on one surface of the housing  510 . In various embodiments, one surface of each metal structure  541  or  542  may contact one surface of the plate  520 . For example, the first metal structure  541  may be electrically coupled to a first metal region  545  formed on one surface of the plate  520 , and the second metal structure  542  may be electrically coupled to a second metal region  546  formed on the same surface of the plate  520 . 
     In one embodiment, the other surface of the plate  520  (e.g., the rear surface of the surface where the first metal region  545  and the second metal region  546  are disposed) may be coupled to one surface of a PCB. In various embodiments, a conductive pattern  530  may be formed on the other surface of the plate  520  to transmit an electrical signal (e.g., RF signal) to the PCB. 
     In one embodiment, when an electrical signal is supplied to the conductive pattern  530 , capacitance components may be generated between the conductive pattern  530  and the metal regions  545  and  546 . The capacitance components generated between the conductive pattern  530  and the metal regions  545  and  546  may be determined based on the thickness of the plate  520  or the area of the overlapping region between the conductive pattern and the metal regions  545  and  546 . 
     In one embodiment, at least one control bolt  551  or  552  may be disposed in one surface of the housing  510 . In various embodiments, the control bolts may be arranged to correspond respectively to the metal structures and may control magnetic fields generated through the metal structures by changing the lengths of the corresponding metal structures. For example, the first control bolt  551  corresponding to the first metal structure  541  may control the value of the inductance due to the first metal structure  541 , and the second control bolt  552  corresponding to the second metal structure  542  may control the value of the inductance due to the second metal structure  542 . 
     In one embodiment, a cavity filter may include: a plate constituting one surface of the cavity filter and including a feeder part for supplying an electrical signal in one surface; a housing constituting the exterior of the cavity filter and coupled to the plate to form a shielded space inside the cavity filter; and a metal structure whose one end is coupled to the inside of the housing and the other end extends toward the feeder part and resonates to filter frequencies in the shielded space. 
     In one embodiment, the other end of the metal structure may be spaced apart by a preset distance from the feeder part. The resonance frequency of the cavity filter may be determined based on the spacing between the other end of the metal structure and the feeder part and the length of the metal structure. 
     In one embodiment, the other end of the metal structure may be spaced apart by a preset distance from the feeder part. The capacitance component of the cavity filter may be determined based on the area of a region where the other end of the metal structure and the feeder part face each other or the spacing between the other end of the metal structure and the feeder part. The inductance component of the cavity filter may be determined based on the length of the metal structure. 
     In one embodiment, the cavity filter may comprise a layer made of a non-metallic material and may further include a layer coupled to the other end of the metal structure. The other end of the metal structure may be spaced apart by a preset distance from the feeder part. A metal region made of a metallic material may be formed on one surface of the layer facing the plate. 
     In one embodiment, the capacitance component of the cavity filter may be determined based on the area of a region of the feeder part that overlaps the metal region or the spacing between the layer and the feeder part. 
     In one embodiment, the cavity filter may further include a control bolt disposed in one surface of the housing to control the inductance component of the cavity filter. 
     In one embodiment, a metal region made of a metallic material may be formed on one surface of the plate facing the metal structure, and the feeder part may be disposed on the other surface of the plate. 
     In one embodiment, one end of the metal structure may be electrically coupled to the metal region. 
     In one embodiment, the capacitance component of the cavity filter may be determined based on the area of a region of the feeder part that overlaps the metal region or the thickness of the plate. 
     In one embodiment, a cavity filter may include: a plate constituting one surface of the cavity filter and including a feeder part for supplying an electrical signal in one surface; a housing constituting the exterior of the cavity filter and coupled to the plate to form a shielded space inside the cavity filter; and a metal structure whose one end is coupled to the inside of the housing and the other end extends toward the feeder part to filter frequencies in the shielded space, wherein a metal region made of a metallic material may be formed on one surface of the plate facing the metal structure and a resonance may be caused by the metal region formed on one surface of the plate to filter frequencies. 
     In one embodiment, an antenna module may include a cavity filter. The cavity filter may include: a plate constituting one surface of the cavity filter and including a feeder part for supplying an electrical signal in one surface; a housing constituting the exterior of the cavity filter and coupled to the plate to form a shielded space inside the cavity filter; and a metal structure whose one end is coupled to the inside of the housing and the other end extends toward the feeder part and resonates to filter frequencies in the shielded space. 
     In one embodiment, the other end of the metal structure may be spaced apart by a preset distance from the feeder part. The resonance frequency of the cavity filter may be determined based on the spacing between the other end of the metal structure and the feeder part and the length of the metal structure. 
     In one embodiment, the other end of the metal structure may be spaced apart by a preset distance from the feeder part. The capacitance component of the cavity filter may be determined based on the area of a region where the other end of the metal structure and the feeder part face each other or the spacing between the other end of the metal structure and the feeder part. The inductance component of the cavity filter may be determined based on the length of the metal structure. 
     In one embodiment, the cavity filter may comprise a layer made of a non-metallic material and may further include a layer coupled to the other end of the metal structure. The other end of the metal structure may be spaced apart by a preset distance from the feeder part. A metal region made of a metallic material may be formed on one surface of the layer facing the plate. 
     In one embodiment, the capacitance component of the cavity filter may be determined based on the area of a region of the feeder part that overlaps the metal region or the spacing between the layer and the feeder part. 
     In one embodiment, the cavity filter may further include a control bolt disposed in one surface of the housing to control the inductance component of the cavity filter. 
     In one embodiment, a metal region made of a metallic material may be formed on one surface of the plate facing the metal structure, and the feeder part may be disposed on the other surface of the plate. 
     In one embodiment, one end of the metal structure may be electrically coupled to the metal region. 
     In one embodiment, the capacitance component of the cavity filter may be determined based on the area of a region of the feeder part that overlaps the metal region or the thickness of the plate. 
     In one embodiment, an antenna module may include a cavity filter. The cavity filter may include: a plate constituting one surface of the cavity filter and including a feeder part for supplying an electrical signal in one surface; a housing constituting the exterior of the cavity filter and coupled to the plate to form a shielded space inside the cavity filter; and a metal structure whose one end is coupled to the inside of the housing and the other end extends toward the feeder part to filter frequencies in the shielded space, wherein a metal region made of a metallic material may be formed on one surface of the plate facing the metal structure and a resonance may be caused by the metal region formed on one surface of the plate to filter frequencies. 
     While the disclosure has been shown and described with reference to various embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims and their equivalents.