Filter for communication equipment

Abstract

A filter for a communication device is provided, which includes a tuning panel having a plurality of tuning bars arranged as a single layer in the thickness direction within a dielectric-filled space. 【Solution means】The filter for a communication device includes a filter body that opens in the thickness direction and forms a part of the dielectric-filled space inside, a filter tuning cover that is coupled in the thickness direction and opens so as to cover the filter body and forms the remaining part of the dielectric-filled space, a resonance substrate that includes a resonance frame in which a plurality of resonators are arranged to form a single layer with respect to the thickness direction within the dielectric-filled space, and a frequency tuning panel that includes a plurality of tuning bars arranged as a single layer with respect to the thickness direction within the dielectric-filled space so as to adjust the separation distance between the plurality of resonators arranged within the dielectric-filled space, and a spacer portion integrally formed with steps on any one of the filter tuning cover and the frequency tuning panel.

Description

Technical Field

[0001] The present invention relates to a filter for a communication device, and more particularly, to a filter for a communication device that can be manufactured to have a slim thickness while achieving weight reduction.

Background Art

[0002] A radio frequency device (including all "communication devices") such as a radio frequency filter is usually composed of a connection structure of a plurality of resonators. Such a resonator is a circuit element that resonates at a specific frequency by a combination of an inductor (L) and a capacitor (C) in terms of an equivalent electronic circuit. Each resonator has a structure in which a dielectric resonance element (DR) or a metal resonance element is provided inside a cavity such as a metallic cylinder or a rectangular parallelepiped surrounded by a conductor. Thereby, each resonator has a structure that enables high-frequency resonance by allowing only the electromagnetic field of the natural frequency according to the processing frequency band to exist in the cavity. Usually, a plurality of cavities are used to form a plurality of resonance stages, and the plurality of resonance stages have a multi-stage structure connected in sequence.

[0003] Examples of radio frequency filters having a plurality of cavity structures include those disclosed in Korean Patent Publication No. 10-2004-0100084 (title: "Radio Frequency Filter", publication date: December 2, 2004) previously filed by the applicant of the present application.

[0004] However, in a conventional radio frequency filter, each resonator extends in the thickness direction inside the cavity, and a part of the filter tuning cover that covers the cavity is deformed by a punching method so as to have a desired band-pass characteristic, and the distance from the resonator is adjusted to tune the frequency. However, there are very restrictive problems in reducing the size of the completed filter in the thickness direction.

[0005] In addition, a conventional radio frequency filter is for enhancing the skirt characteristics between adjacent resonators or between separated resonators within a plurality of cavities, and requires the installation of an additional configuration of a conductor material to realize inductive coupling or capacitive coupling. However, it is also pointed out that there is a problem that the weight of the completed filter increases significantly.

Summary of the Invention

Problems to be Solved by the Invention

[0006] The present invention has been made to solve the above technical problems, and an object thereof is to provide a filter for a communication device including a tuning panel provided with a plurality of tuning bars arranged as a single layer in the thickness direction within a dielectric-filled space.

[0007] At the same time, another object of the present invention is to provide a filter for a communication device capable of performing frequency tuning by adjusting the separation distance between a plurality of resonators of a resonance substrate arranged as a single layer different from the tuning panel in the thickness direction within a dielectric-filled space.

[0008] Furthermore, another object is to provide a filter for a communication device including a notch forming portion formed as a single layer identical to the tuning panel.

[0009] The technical problems of the present invention are not limited to the problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

Means for Solving the Problems

[0010] A filter for a communication device according to an embodiment of the present invention includes a filter body that is open in the thickness direction and forms a part of a dielectric filling space inside, a filter tuning cover that is coupled in the thickness direction and is open so as to cover the filter body and forms the rest of the dielectric filling space, a resonance substrate including a resonance frame in which a plurality of resonators are arranged to form a single layer with respect to the thickness direction inside the dielectric filling space, and a frequency tuning panel including a tuning frame in which a plurality of tuning bars are arranged as a single layer with respect to the thickness direction inside the dielectric filling space so as to adjust a separation distance between the plurality of resonators arranged inside the dielectric filling space, and a spacer portion integrally formed in a stepped manner on any one of the filter tuning cover and the frequency tuning panel.

[0011] Here, the spacer portion may be provided to secure the separation distance between the plurality of resonators and the plurality of tuning bars.

[0012] Further, the spacer portion may be integrally formed on the filter tuning cover and formed as a stepped portion such that an upper surface of an edge portion of the frequency tuning panel is laminated at a position higher than a lower end edge of the filter tuning cover laminated on an upper surface of the resonance substrate.

[0013] Further, the spacer portion may be a different layer between an upper surface and a lower surface of the filter tuning cover and include the stepped portion so as to form a bonding surface to which an upper surface of an edge portion of the frequency tuning panel is bonded.

[0014] Further, an outer end of the bonding surface may be formed at a position corresponding to an edge of the frequency tuning panel.

[0015] Further, a height of the stepped portion may be a separation distance between an upper surface of the frequency tuning panel laminated in the dielectric filling space and an upper surface of the resonance frame of the resonance substrate.

[0016] Further, the upper surface of the edge portion of the tuning frame and the upper surfaces of the plurality of tuning bars may be formed as a single layer having the same horizontal plane.

[0017] Here, the spacer portion may be integrally formed with the frequency tuning panel, and may be formed as a stepped portion such that an edge portion of the frequency tuning panel laminated on the upper edge surface of the resonance substrate is at a lower position than the plurality of tuning bars.

[0018] Further, the stepped portion may be formed in a stepped manner such that the plurality of tuning bars and the tuning frame form different layers.

[0019] Further, an end portion of the filter tuning cover is in the same layer as the plurality of tuning bars and can be laminated and coupled to an upper surface portion of the stepped portion.

[0020] Further, the height of the stepped portion may be an isolation distance between the lower surface of the filter tuning cover and the upper surface of the tuning frame.

[0021] Further, a plurality of coupling adjustment bars integrally formed with the tuning frame of the frequency tuning panel, deformed in shape toward the dielectric filling space side, and configured to change a coupling value between adjacent resonators among the plurality of resonators may be further included.

[0022] Further, the plurality of coupling adjustment bars may be alternately arranged with the plurality of resonators in the thickness direction of the dielectric filling space.

[0023] Further, the plurality of coupling adjustment bars may be formed so as to be alternately arranged with the plurality of tuning bars in the longitudinal direction of the tuning frame.

Advantages of the Invention

[0024] According to the filter for a communication device according to an embodiment of the present invention, the following various effects can be achieved.

[0025] First, since a plurality of resonators of the resonance substrate and a plurality of tuning bars of the frequency tuning panel are respectively arranged as different single layers in the dielectric-filled space, it has the effect of facilitating the slim design of the product.

[0026] Second, since the notch forming portion is provided so as to form the same single layer as the plurality of tuning bars of the frequency tuning panel, no additional parts are required for skirt characteristics, so it has the effect of preventing an increase in the weight of the product and facilitating weight reduction design.

Brief Description of the Drawings

[0027]

Figure 1

Figure 2

Figure 3A

Figure 3B

Figure 4

Figure 5

Figure 6A

Figure 6B

Figure 7

Modes for Carrying Out the Invention

[0028] Hereinafter, a filter for a communication device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[0029] When attaching reference numerals to the components in each drawing, it should be noted that for the same components, as far as possible, the same numerals are used even if they are shown on other drawings. Also, when explaining the embodiments of the present invention, if it is determined that a specific explanation of such known components or functions hinders the understanding of the embodiments of the present invention, the detailed explanation thereof is omitted.

[0030] When explaining the components of the embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc. can be used. Such terms are only for distinguishing the components from other components, and the essence, order, or procedure of the components are not limited by such terms. Also, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those having ordinary knowledge in the technical field to which the present invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or overly formal sense unless clearly defined in the present application.

[0031] The filters 100 and 200 for communication devices according to the embodiments of the present invention include filter bodies 110 and 210, and filter tuning covers 120 and 220 coupled to the filter bodies 110 and 210 so as to form dielectric-filled spaces 110S and 210S between the filter bodies 110 and 210.

[0032] The dielectric-filled spaces 110S and 210S are filled with a dielectric having a predetermined dielectric constant, and in the embodiments of the present invention, air also corresponds to a dielectric material having a predetermined dielectric constant. Therefore, the explanation is made on the premise that the dielectric-filled spaces 110S and 210S are filled with air as the dielectric. Thus, when air is adopted as the dielectric, it would mean that as long as the dielectric-filled spaces 110S and 210S are not in a sealed vacuum state, the dielectric-filled spaces 110S and 210S, which consist of empty spaces, are naturally filled with air as the dielectric without another dielectric filling process.

[0033] Hereinafter, the filters for communication devices according to the present invention will be described in detail for each example in turn.

[0034] FIG. 1 is a bottom perspective view showing a filter for a communication device according to a first embodiment of the present invention, FIG. 2 is a top perspective view showing the filter for a communication device according to the first embodiment of the present invention, FIGS. 3A and 3B are exploded perspective views of FIGS. 1 and 2, respectively, and FIG. 4 is a partial cutaway perspective view taken along line A-A of FIG. 1.

[0035] As shown in FIGS. 1 to 4, a filter 100 for a communication device according to a first embodiment of the present invention may include a filter body 110, a filter tuning cover 120 coupled to form a dielectric filling space 110S between the filter body 110, a resonance substrate 130 including a plurality of resonators 131 arranged to form a single layer in the thickness direction within the dielectric filling space 110S, and a frequency tuning panel 140 including a plurality of tuning bars 141 arranged to form a single layer in the thickness direction within the dielectric filling space 110S.

[0036] As shown in FIGS. 3A and 3B, the filter body 110 may be formed in a slim rectangular parallelepiped shape so as to form a closed dielectric filling space 110S having a thickness t smaller than the sizes in the substantially longitudinal direction l and width direction w.

[0037] Here, a part of the dielectric filling space 110S can be formed by the open side space of the filter body 110, and the rest of the dielectric filling space 110S can be formed by the other side space of the filter tuning cover 120.

[0038] For the formation of such a dielectric filling space 110S, the filter body 110 may be provided in a form in which one side surface to which the filter tuning cover 120 is coupled is recessed by a predetermined depth in a direction (vertical in the drawing) in which the other side surface faces, and the inner surface of the filter tuning cover 120 may also be provided in a form recessed by a predetermined depth in the opposite direction (above in the drawing).

[0039] Although a dielectric having a predetermined dielectric constant can be filled inside the dielectric filling space 110S, as described above, air is also a type of dielectric having a predetermined dielectric constant. Therefore, in the first embodiment of the present invention (the same applies to all the second embodiments described later), the description will be made on the premise that the dielectric filling space 110S is filled with air as the dielectric.

[0040] On the other hand, the filter body 110 can be formed with an input port hole and an output port hole (not shown) through which an input port and an output port (not shown) for inputting a predetermined signal to one side of a resonance substrate 130 described later are fixed so as to communicate with the dielectric filling space 110S.

[0041] Here, the input port and the output port can be electrically connected to the resonance substrate 130 so as to maintain impedance matching through an input coaxial connector and an output coaxial connector (not shown), respectively. However, the electrical connection with the resonance substrate 130 is not necessarily limited to the method using the input port and the input coaxial connector and the output port and the output coaxial connector. As long as it is a conductive medium provided on a main board not shown, electrical connection can be achieved by an electrical connection configuration of any structure such as a pin.

[0042] The resonance substrate 130 is arranged as a single layer in the thickness direction t inside the dielectric filling space 110S, and a plurality of resonators 131 are also formed as a single layer, and can include a resonance frame 130F having a rectangular edge.

[0043] Here, the resonance frame 130F may be formed to have an edge portion that matches the edge portions of the substantially filter body 110 and the filter tuning cover 120.

[0044] Hereinafter, for the convenience of understanding, it is assumed that the resonance frame 130F is formed by cutting open the middle into a rectangle and communicating vertically, and is formed in a long rectangle (rectangle) from the left side direction to the right side direction on the drawing surfaces of FIGS. 3A and 3B. The left and right ends in the longitudinal direction are each called "short sides" because the side lengths are relatively small, and the front and rear ends in the width direction are each called "long sides" because the side lengths are relatively large for the purpose of explanation.

[0045] Here, as shown in FIGS. 3A and 3B, the plurality of resonators 131 can be formed to extend a predetermined length from any one long side (130A) (hereinafter referred to as "one-side long side") of the four sides (four sides) of the resonance frame 130F to the other long side (130B) (hereinafter referred to as "the other-side long side").

[0046] However, it is preferable that the plurality of resonators 131 are formed to be separated so that their tips are not connected to the inner edge end of the above-mentioned other-side long side 130B.

[0047] Also, the plurality of resonators 131 may be formed so that their tips have the same separation distance from the inner edge end of the other-side long side 130B. However, the extension time point parts corresponding to the one-side long side 130A of each of the plurality of resonators 131 do not have to be all the same, and can be designed so that the extension time point parts are different based on the frequency band pass characteristics required by the designer. That is, the extension time point parts of each of the plurality of resonators 131 correspond to the inner edge end of any one long side 130A described above, but may be provided in a form that extends from the inner edge end of this long side 130A to each extension time point part of the adjacent resonator 131.

[0048] On the other hand, as shown in FIGS. 3A and 3B, the frequency tuning panel 140 may be arranged as a single layer between the resonance substrate 130 and the filter tuning cover 120.

[0049] More specifically, the frequency tuning panel 140 can include a tuning frame 140F having an edge provided in a rectangular shape, and a plurality of tuning bars 141 extending from the inner side of one long side 140A of the four sides (four edges) of the tuning frame 140F toward the other long side 140B side.

[0050] Here, the plurality of tuning bars 141 can be integrally formed on the tuning frame 140F. Preferably, the plurality of tuning bars 141 can be integrally extended from the inner side of one long side 140A of the tuning frame 140F and can be formed to extend a predetermined length so as to form the same single layer in the thickness direction t of the dielectric filling space 110S.

[0051] Such a frequency tuning panel 140 may be arranged as a single layer different from the plurality of resonators 131 in the thickness direction t in the dielectric filling space 110S so as to adjust the separation distance between the plurality of tuning bars 141 and the plurality of resonators 131 arranged in the dielectric filling space 110S.

[0052] Here, the plurality of tuning bars 141 may be provided at a predetermined distance apart in the longitudinal direction l along the inner edge surface of one long side 140A of the tuning frame 140F, and each tuning bar 141 may be arranged at a position spaced apart in the longitudinal direction l so as to be respectively matched with the plurality of resonators 131 arranged at intervals in the thickness direction t in the dielectric filling space 110S.

[0053] On the other hand, different from the case where the extension time points of the plurality of resonators 131 described above are different, the extension time point part inside one long side 140A of the tuning frame 140F can be set to the inner edge end corresponding to one long side 140A of the tuning frame 140F where all are on the same line.

[0054] Further, the tips of the plurality of tuning bars 141 extend such that the tips of the plurality of resonators 131 described above have the same separation distance as the inner edge of the other long side 130B of the resonance frame 130F, while the lengths extending toward the other long side 140B can be set to be the same or different respectively.

[0055] However, in this case, the plurality of tuning bars 141 are configured to perform fine frequency tuning by adjusting the separation distance from the plurality of resonators 131 arranged as different single layers in the dielectric filling space 110S. In this regard, it is preferable that the plurality of resonators 131 or the plurality of tuning bars 141 are designed to be arranged with a predetermined length overlap at least in the thickness direction t of the dielectric filling space 110S.

[0056] At this time, assuming that the dielectric filled in the dielectric filling space 110S is air, there is of course an air layer between the plurality of resonators 131 of the resonance substrate 130 and the tuning bars 141 of the frequency tuning panel 140, and an air layer having the same dielectric constant can also exist between the plurality of resonators 131 and the inner surface of the filter body 110. Fine frequency tuning can be performed by the fine change of the air layer due to the shape deformation amount of each tuning bar 141 of the frequency tuning panel 140.

[0057] At the same time, as shown in FIGS. 3A and 3B, the filter 100 for a communication device according to the first embodiment of the present invention can further include a plurality of coupling adjustment bars 143 that are integrally formed on the tuning frame 140F of the frequency tuning panel 140 and are deformed in shape toward the dielectric filling space 110S side to change the coupling value between adjacent resonators 131 among the plurality of resonators.

[0058] Here, the plurality of coupling adjustment bars 143 can be formed to extend from the inner side of one long side 140A of the tuning frame 140F to the other long side 140B side, similar to the plurality of tuning bars 141 described above.

[0059] At this time, the plurality of coupling adjustment bars 143 are formed at a predetermined distance apart in the longitudinal direction l of the tuning frame 140F, and any one of the plurality of tuning bars 141 may be disposed between each of the coupling adjustment bars 143. That is, the plurality of tuning bars 141 and the plurality of coupling adjustment bars 143 may be formed so as to be integrally connected inside one long side 140A of the tuning frame 140F, and may be formed so that they are alternately arranged in the longitudinal direction l of the tuning frame 140F.

[0060] Also, the plurality of coupling adjustment bars 143 are preferably arranged alternately with the plurality of resonators 131 in the thickness direction t of the dielectric filling space 110S.

[0061] In this way, when a tip of any one of the plurality of coupling adjustment bars 143 is pushed toward the dielectric filling space 110S using a predetermined tool so that a tuning operator (designer) between adjacent resonators among the plurality of resonators 131 realizes a desired coupling value, the tip of the coupling adjustment bar 143 is deformed and positioned between the adjacent resonators 131, and depending on the specific shape of the C-notch portion 142C or the L-notch portion 142L described later, the tuning operator can realize the coupling value as desired design values.

[0062] On the other hand, in the filter 100 for a communication device according to the first embodiment of the present invention, as shown in FIGS. 3A and 3B, the frequency tuning panel 140 includes a notch forming portion 142 including an L-notch portion 142L that protrudes and extends while forming a closed loop from the inside of the other long side 140B to the one long side 140A side among the four sides (four sides) of the tuning frame 140F, and a C-notch portion 142C that extends so as to be connected inside the one long side 140A without forming a closed loop.

[0063] Here, the L-notch portion 142L serves to enhance skirt characteristics and form an L-notch by inductive coupling at the right end of the passband, and the C-notch portion 142C serves to enhance skirt characteristics and form a C-notch by capacitive coupling at the left end of the passband.

[0064] The L-notch portion 142L may be extended and provided so as to form a closing loop that does not contact the one long side 140A while forming the same single layer as the tuning bar 141 described above from the inside of the other long side 140B of the frequency tuning panel 140.

[0065] At the same time, the C-notch portion 142C may be extended and provided so as to be connected to the one long side 140A while forming the same single layer as the tuning bar 141 described above from the inside of the other long side 140B of the frequency tuning panel 140 or from the above-described L-notch portion 142L. Here, different from the L-notch portion 142L, the C-notch portion 142C has a difference that it does not form a closed loop with respect to the other long side 140B within the same single layer.

[0066] The C-notch portion 142C and the L-notch portion 142L form an electric field (E-field) or a magnetic field (H-field) among a plurality of resonators 131 provided within the same single layer with their respective shapes and the shapes of corner portions and bent portions being the same, and form the above-described C-notch or L-notch on the left or right side of the passband.

[0067] On the other hand, as shown in FIGS. 3A and 3B, the C-notch portion 142C of the C-notch portion 142C and the L-notch portion 142L can be formed by extending from the inner edge end of the other long side 140B of the frequency tuning panel 140, and can also be formed by extending from a part of the pre-formed L-notch portion 142L.

[0068] At the same time, as described above, the resonator 131 of the resonance substrate 130 and the tuning bar 141 of the frequency tuning panel 140 perform fine frequency tuning by adjusting the isolation distance in the thickness direction t, so a structural design is required to ensure the minimum isolation distance.

[0069] Therefore, the filter 100 for a communication device according to the first embodiment of the present invention can further include a spacer portion (not shown in the drawing reference numeral) provided to ensure the isolation distance between the tuning bar 141 of the frequency tuning panel 140 and the resonator 131 of the resonance substrate 130.

[0070] Here, as shown in FIGS. 1 to 4, the spacer portion may be integrally formed in steps on the filter tuning cover 120 and may be formed as a stepped portion 125 such that the upper surface of the edge portion of the frequency tuning panel 140 is joined and laminated at a position higher than the lower end edge of the filter tuning cover 120 laminated on the upper surface of the resonance substrate 130.

[0071] More specifically, as shown in FIG. 4, the spacer portion may be a different layer between the upper surface and the lower surface of the filter tuning cover 120 and may include the stepped portion 125 provided to form a joint surface 126 to which the upper surface of the edge portion of the frequency tuning panel 140 is joined.

[0072] Here, in terms of the frequency tuning panel 140 being joined to the joint surface 126 corresponding to the horizontal plane of the stepped portion 125, it is preferable that the size of its edge is formed corresponding to the outer end of the joint surface 126. That is, the outer end of the joint surface 126 may be formed at a position corresponding to the edge formed by the tuning frame 140F of the frequency tuning panel 140.

[0073] Therefore, the height 125t of the stepped portion 125 may be defined by the isolation distance between the upper surface of the frequency tuning panel 140 laminated in the dielectric filling space 110S and the upper surface of the resonance frame 130F of the resonance substrate 130.

[0074] In this case, it is assumed that the upper surface of the edge portion of the tuning frame 140F and the upper surfaces of the plurality of tuning bars 141 formed thereon are formed as a single layer having the same horizontal plane.

[0075] Such a stepped portion 125 serves to block direct contact between the plurality of tuning bars 141 of the frequency tuning panel 140 and the plurality of resonators 131 of the resonance substrate 130, and forms the above-described air layer.

[0076] As another example for forming a separation space (air layer) between the plurality of tuning bars 141 and the plurality of resonators 131, it is also possible to be provided with a spacer panel that is separately manufactured and laminated between the frequency tuning panel 140 and the resonance substrate 130. However, the first embodiment (100) of the present invention and the second embodiment (200) described later exclude the concept of an embodiment of separately manufacturing such as a spacer panel.

[0077] Here, the meaning of blocking direct contact between the frequency tuning panel 140 and the resonance substrate 130 by the spacer portion only means avoiding physical space contact by forming a thickness so as to secure an isolation distance, and does not mean blocking electrical connection.

[0078] Such a spacer portion has an air layer between the resonator 131 of the resonance substrate 130 and the tuning bar 141 of the frequency tuning panel 140, and serves to secure the above-described isolation distance so that a desired passband frequency can be tuned by fine adjustment of the separation distance in this air layer.

[0079] More specifically, as shown in FIGS. 1 to 4, the dielectric filling space 110S corresponding to between the filter body 110 and the filter tuning cover 120 is filled with a dielectric defined by air. After a designer for tuning inserts a predetermined tuning tool (not shown) into the inside of the dielectric filling space 110S through the lower part of the filter body 110 or the upper part of the filter tuning cover 120, the tip of the resonator 131 is pushed to change the shape in the thickness direction t on the tuning bar 141 side, or the tip of the tuning bar 141 is changed in shape in the thickness direction t on the resonator 131 side, and a fine frequency tuning operation can be performed.

[0080] Here, a plurality of bottom tuning holes (not shown) for inserting the above-described tuning tool may be formed on the lower surface of the filter body 110 so as to communicate with the dielectric filling space 110S, and a plurality of upper tuning holes 122 for inserting the above-described tuning tool may be formed on the upper surface of the filter tuning cover 120 so as to communicate with the dielectric filling space 110S.

[0081] However, it is not necessary that both the filter body 110 and the filter tuning cover 120 be provided with the bottom tuning holes and the upper tuning holes 122. Either one of the two can function as a tuning hole into which the original tuning tool is inserted, and the remaining one can also be provided to function as a tuning correction hole for the purpose of correction after tuning.

[0082] Further, as shown in FIGS. 1 to 4, the filter body 110 may be provided without a bottom tuning hole, and only the filter tuning cover 120 may be provided with an upper tuning hole 122 and a tuning correction hole 121. The tuning correction hole 121 may be a hole provided to re-adjust the deformed tuning bar 141 again by inserting another tuning correction tool (not shown) when correction is required after performing fine frequency tuning using a tuning tool.

[0083] The filter for a communication device according to the first embodiment of the present invention having such a configuration is configured by sequentially laminating and arranging a filter body 110, a resonance substrate 130, a frequency tuning panel 140, and a filter tuning cover 120, and laminating and arranging them so that the upper surface of the frequency tuning panel 140 is adhered to the lower surface of the joint surface 126 that is the horizontal surface of the stepped portion 125. Thus, a predetermined isolation distance can be ensured between the resonator 131 of the resonance substrate 130 and the thickness direction t of the tuning bar 141 of the frequency tuning panel 140.

[0084] Here, the filter body 110, the resonance substrate 130, the frequency tuning panel 140, and the filter tuning cover 120 may all be made of a metal material, or after being made of a predetermined dielectric material, the portions exposed on the dielectric filling space 110S side may all be coated with a metal material. As long as the portions exposed on the dielectric filling space 110S side are coated with a metal material and the dielectric filling space 110S can be formed as a closed space, various bonding methods including a welding bonding method and an adhesive bonding method can be applied to the lamination bonding method of the remaining components (resonance substrate 130, frequency tuning panel 140, and filter tuning cover 120) with respect to the filter body 110.

[0085] Next, a specific passband frequency filtering process of the filter 100 for communication devices according to the first embodiment of the present invention configured as described above will be briefly described. Since this is also directly applicable to the case of the filter 200 for communication devices according to the second embodiment to be described later, specific descriptions thereof will be omitted in the description of the second embodiment 200.

[0086] First, when a predetermined signal is input into the dielectric-filled space 110S through an input port on one side, it is sequentially transmitted in the longitudinal direction l through the resonator 131 of the resonance substrate 130 connected through the input part coaxial connector of the input port in the dielectric-filled space 110S, and then output through the resonator 131 of the resonance substrate 130 connected to the output part coaxial connector of the output port in the dielectric-filled space 110S.

[0087] At this time, only a specific bandpass frequency can be output by fine frequency tuning through detailed design of the separation distance in the vertical thickness direction t between each resonator 131 and the tuning bar 141.

[0088] Here, according to the filter 100 for communication devices according to the first embodiment of the present invention, the extension forming direction of the resonator 131 is provided to form a single layer with respect to the thickness direction t in the dielectric-filled space 110S, and the tuning bar 141 is also provided such that its extension forming direction forms a single layer with respect to a thickness direction t different from that of the resonator 131 in the dielectric-filled space 110S. Thus, the overall thickness of the product can be made slim, providing the advantage that fine frequency tuning is possible within the limit of the separation distance of each single layer with respect to the different thickness directions t described above.

[0089] On the other hand, the filter 100 for communication devices according to the first embodiment of the present invention, as shown in FIGS. 1 to 4, does not completely partition the dielectric-filled space 110S, but can further include a plurality of space dividing ribs 117W that at least partially partition the bottom surface portion of the dielectric-filled space 110S formed by the filter body 110.

[0090] A plurality of space-dividing ribs 117W are formed to extend from the bottom surface on one long side to the bottom surface on the other long side so as to divide the inner bottom surface formed long in the longitudinal direction l of the filter body 110 into a plurality of surfaces, and may be formed in a rib form protruding a predetermined length from at least the bottom surface of the dielectric filling space 110S toward the filter tuning cover 120.

[0091] Such a plurality of space-dividing ribs 117W occupy a part of the dielectric filling space 110S and at least divide the space between the resonators 131 in a cavity form. Therefore, by adjusting the coupling amount between the adjacent resonators 131 according to the size and form of the occupied space, it provides the advantage that tuning of various passband frequencies is possible.

[0092] At the same time, the filter body 110 can be coupled so that the entire bottom surface is soldered to the main board side (not shown). However, since the plurality of space-dividing ribs 117W divide the bottom surface of the filter body 110 in the longitudinal direction l, it can also play a role in dispersing and eliminating the thermal stress generated by the difference in the thermal expansion coefficient between the main board made of a PCB material.

[0093] As shown in FIGS. 1 to 4, the filter 100 for a communication device according to the first embodiment of the present invention utilizes the properties of the electric field and magnetic field between the respective resonators 131 provided inside the dielectric filling space 110S, and can include an L-notch portion 142L that realizes inductive coupling and a C-notch portion 142C that realizes capacitive coupling, which has already been described.

[0094] Inductive coupling is a type of coupling that utilizes the properties of the magnetic field around the resonator 131 provided in the dielectric filling space 110S. As long as there is no structure that affects the properties of the magnetic field between the adjacent resonators 131, it is a coupling that is naturally formed between them. In particular, when realizing cross-coupling that skips the resonator provided in the middle among any three resonators 131, the meaning of providing the above-described L-notch portion 142L is greater.

[0095] Here, in the case of the filter 100 for a communication device according to the first embodiment of the present invention, the L-notch portion 142L is provided so as not to block the signal transmission path direction between the tips of adjacent resonators 131, and may be provided with a portion closer to the resonator provided in the middle among any three resonators 131.

[0096] On the other hand, capacitive coupling is a type of coupling that utilizes the nature of the electric field around the resonator 131 provided in the dielectric filling space 110S, and can be realized by a structure arranged on the signal transmission path corresponding to the electric fields of adjacent resonators 131.

[0097] More specifically, the C-notch portion 142C extends from the other long side 140B of the frequency tuning panel 140 to the one long side 140A and is connected, and is formed to be involved in any three resonators 131 in the dielectric filling space 110S. In this case, the start end and the tip end of the C-notch portion 142C can be designed to be arranged closer to the middle resonator among any three resonators 131, respectively. FIG. 5 is a perspective view showing a filter for a communication device according to the second embodiment of the present invention, FIGS. 6A and 6B are lower exploded perspective views and upper exploded perspective views of FIG. 5, and FIG. 7 is a B-B line partial cutaway perspective view of FIG. 5.

[0098] Hereinafter, the filter 200 for a communication device according to the second embodiment of the present invention has the same configuration as the filter 100 for a communication device according to the first embodiment described above, except for a spacer portion for securing an isolation distance in the thickness direction t between the resonator 231 of the resonance substrate 230 and the tuning bar 241 of the frequency tuning panel 240. Therefore, redundant explanations are omitted, and the description will be centered on the different spacer portion.

[0099] In the filter 200 for a communication device according to the second embodiment of the present invention, as shown in FIGS. 5 to 7, the spacer portion is integrally formed in a stepped manner on the frequency tuning panel 240 and is laminated on the upper edge surface of the resonance substrate 230. The edge end portion of the frequency tuning panel 240 (more specifically, the edge end portion of the tuning frame 240F) may be formed as a stepped portion 245 such that it is at a position lower than that of the plurality of tuning bars 241.

[0100] More specifically, in the case of the filter 100 for a communication device according to the first embodiment, as shown in FIGS. 6A and 6B, the tuning frame 240F of the frequency tuning panel 240 and the plurality of tuning bars 241 formed thereon are all formed in the same layer, while in the filter 200 for a communication device according to the second embodiment, the tuning frame 240F of the frequency tuning panel 240 forms a layer different from that of the plurality of tuning bars 241, and the stepped portion 245 is formed in a stepped manner.

[0101] Here, as shown in FIG. 7, the end portion of the filter tuning cover 220 is in the same layer as the plurality of tuning bars 241 and can be laminated and bonded to the upper surface portion of the stepped portion 245.

[0102] Therefore, the height of the stepped portion 245 may be defined by the isolation distance between the lower surface of the filter tuning cover 220 and the upper surface of the tuning frame 240F of the frequency tuning panel 240.

[0103] Thus, the filter 200 for a communication device according to the second embodiment of the present invention has a difference in that, unlike the spacer portion being integrally formed with the filter tuning cover 120 in the first embodiment 100, it is integrally formed with the frequency tuning panel 240. However, it performs the same function in terms of securing a predetermined isolation distance so as to form an air layer between the plurality of resonators 131, 231 and the plurality of tuning bars 141, 241. By enabling fine frequency adjustment, it is possible to manufacture a slim product, and it also provides the advantage of enhancing the skirt characteristics by the notch forming portion.

[0104] As described above, the filter for a communication device according to the embodiment of the present invention has been described in detail with reference to the attached drawings. However, it goes without saying that the embodiments of the present invention are not necessarily limited to the above-described embodiments, and various modifications and implementations within an equivalent range by those having ordinary knowledge in the technical field to which the present invention pertains are possible. Therefore, the true scope of the rights of the present invention is defined by the claims described later.

Industrial Applicability

[0105] The present invention includes a tuning panel provided with a plurality of tuning bars arranged as a single layer in the thickness direction within a dielectric-filled space, and can perform frequency tuning by adjusting the separation distance between a plurality of resonators of a resonance substrate arranged as a single layer different from the tuning panel in the thickness direction within the dielectric-filled space, and provides a filter for a communication device including a notch forming portion formed as the same single layer as the tuning panel.

Explanation of Reference Numerals

[0106] 100, 200: Filter for a communication device, 110S, 210S: Dielectric-filled space 110, 210: Filter body, 117W, 217W: Space dividing rib 120, 220: Filter tuning cover, 121: Tuning correction hole 122, 222: Tuning hole, 125: Step portion (spacer portion) 130, 230: Resonance substrate, 130F, 230F: Resonance frame 131, 231: Resonator, 140, 240: Frequency tuning panel 140F, 240F: Tuning frame, 141, 241: Tuning bar 142, 242: Notch forming portion, 143, 243: Coupling adjustment bar 245: Step portion (spacer portion)

Claims

1. A filter body that opens in the thickness direction and forms a part of a dielectric filling space inside; A filter tuning cover that is coupled in the thickness direction and opens so as to cover the filter body, and forms the remaining part of the dielectric filling space; A resonance substrate including a resonance frame in which a plurality of resonators are arranged so as to form a single layer with respect to the thickness direction inside the dielectric filling space; A frequency tuning panel including a tuning frame provided with a plurality of tuning bars arranged as a single layer with respect to the thickness direction inside the dielectric filling space so as to adjust the separation distance from the plurality of resonators arranged inside the dielectric filling space; A filter for a communication device, comprising: a spacer portion integrally formed in a stepped manner on any one of the filter tuning cover and the frequency tuning panel.

2. The filter for a communication device according to claim 1, wherein the spacer portion is provided so as to secure the separation distance between the plurality of resonators and the plurality of tuning bars.

3. The filter for a communication device according to claim 1, wherein the spacer portion is integrally formed on the filter tuning cover, and is formed as a stepped portion such that an upper surface of an edge portion of the frequency tuning panel is laminated at a position higher than a lower end edge of the filter tuning cover laminated on an upper surface of the resonance substrate.

4. The filter for a communication device according to claim 3, wherein the spacer portion is a different layer between an upper surface and a lower surface of the filter tuning cover, and includes the stepped portion so as to form a bonding surface to which an upper surface of an edge portion of the frequency tuning panel is bonded.

5. The filter for a communication device according to claim 4, wherein an outer end of the bonding surface is formed at a position corresponding to an edge of the frequency tuning panel.

6. The filter for a communication device according to claim 4, wherein a height of the stepped portion is a separation distance between an upper surface of the frequency tuning panel laminated in the dielectric filling space and an upper surface of the resonance frame of the resonance substrate.

7. The filter for a communication device according to any one of claims 3 to 6, wherein an upper surface of an edge portion of the tuning frame and upper surfaces of the plurality of tuning bars are formed as a single layer having the same horizontal plane.

8. The spacer portion is The filter for a communication device according to claim 1, wherein an edge portion of the frequency tuning panel integrally formed with and laminated on an edge upper surface of the resonance substrate is formed as a stepped portion such that the edge portion is at a position lower than the plurality of tuning bars.

9. The filter for a communication device according to claim 8, wherein the stepped portion is formed in a stepped manner such that the plurality of tuning bars and the tuning frame form different layers.

10. The filter for a communication device according to claim 8, wherein an end portion of the filter tuning cover is in the same layer as the plurality of tuning bars and is laminated and coupled to an upper surface portion of the stepped portion.

11. The filter for a communication device according to claim 8, wherein a height of the stepped portion is an isolation distance between a lower surface of the filter tuning cover and an upper surface of the tuning frame.

12. The filter for a communication device according to claim 1, further including a plurality of coupling adjustment bars integrally formed on a tuning frame of the frequency tuning panel, deformed in shape toward the dielectric filling space side, and configured to change a coupling value between adjacent resonators among the plurality of resonators.

13. The filter for a communication device according to claim 12, wherein the plurality of coupling adjustment bars are alternately arranged with the plurality of resonators in a thickness direction of the dielectric filling space.

14. The filter for a communication device according to claim 12, wherein the plurality of coupling adjustment bars are formed to be alternately arranged with the plurality of tuning bars in a longitudinal direction of the tuning frame.

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