KR101388642B1 - Filter combiner/divider - Google Patents

Abstract

The present invention is a filter comb for commonly connecting RF (Radio Frequency) filters composed of a plurality of resonant blocks configured by using a dielectric resonator (DR) or a metal resonator rod provided in the accommodation space. A binner / divider, comprising: a receptacle space formed by a plurality of diaphragms directly adjacent to each first or last resonant block of RF filters to be connected to each other in advance; A plurality of coupling windows formed in the plurality of diaphragms; It includes a structure of the resonance block having a metal resonance rod is installed inside the resonance receiving space; When the resonant block of the neighboring RF filter is configured using DR, the coupling window is formed to be set at a predetermined distance from the upper housing at the top of the corresponding diaphragm, and the diaphragm is set above the height of the DR and the upper housing And a predetermined interval to form a coupling window.

RF, Filter, Combiner, Divider, DR, Resonator Rod, Coupling

Description

Filter combiner / divider {FILTER COMBINER / DIVIDER}

1A, 1B, and 1C are exemplary structural diagrams of a high frequency (RF) filter using a dielectric resonator (DR).

2a, 2b, 2c is an exemplary structural diagram of an RF filter using a metal resonant rod

3A and 3B are exemplary structural diagrams of conventional RF filters and a filter combiner / divider.

4 is a structural diagram of RF filters and a filter combiner / divider according to an embodiment of the present invention

FIG. 5 is a detailed structural view of the filter combiner / divider and its surroundings in FIG. 4.

FIG. 6 is a side view of the filter combiner / divider of FIG. 5.

7 is an equivalent circuit diagram of FIG. 4.

8 is a structural diagram of RF filters and a filter combiner / divider according to another embodiment of the present invention

9 is an equivalent circuit diagram of FIG. 8.

The present invention relates to a filter combiner / divider that combines and distributes inputs and outputs of radio frequency (RF) filters.

The high frequency filter (DR filter, cavity filter, wave guide filter, etc.) has a kind of circuit cylinder structure for resonating high frequency, especially ultra high frequency. Generally, a resonant circuit using a coil and a capacitor is not suitable for forming a very high frequency because of a large radiation loss. The RF filter forms a cavity of a metallic cylinder or cuboid surrounded by a conductor, and includes a resonator rod of a metal (DR) or a metal inside thereof, so that only an electromagnetic field of a natural frequency exists, so that high frequency resonance It has a structure that makes it possible.

These RF filters have low insertion loss and are advantageous for high output, so they are applied to almost all transmission / reception communication equipments such as mobile communication base stations, repeaters, broadcast repeaters, and satellite communication systems, and also for duplexers and bandpass filters. Are employed. Hereinafter, the configuration and operation of the RF filter will be described in detail with reference to the accompanying drawings.

FIG. 1A is an overall perspective view illustrating an exemplary structure of an RF filter using a general DR, FIG. 1B is a partially cutaway perspective view of FIG. 1A, and FIG. 1C is a cutaway perspective view along a dashed-dotted line B in FIG. 1A. 1A to 1C, the RF filter 100 using DR first includes a housing 110 forming a body and a cover 160 coupled to an upper surface of the housing 110 to shield the inside thereof. The interior of the housing 110 is divided into a plurality of receiving spaces (6 in the example of Figure 1) by the diaphragm 130, each hollow space is formed in the receiving space to resonate the desired frequency, for example A disk-shaped dielectric resonator (DR) 120 is mounted. One side of the housing 110 (the same side in the example of FIG. 1A) is provided with input and output connectors 111 and 113 for inputting and outputting a wireless signal, and each of the dielectric resonators DR provided in the accommodation space at the corresponding installed position. 120 and the coupling copper wire 115 (FIG. 1C). The diaphragm 130 has coupling windows 131, 132, 133, 134 and 135 which connect the receiving spaces in series from the receiving space to which the input connector 111 is connected to the receiving space to which the output connector 113 is connected. do.

When the DR 120 is mounted in each accommodation space of the housing 110, the upper end of the housing 110 is sealed by the cover 160. As shown in FIG. 1A, the cover 160 and the housing 110 are mutually connected by screw 179 fastened to a screw fastening hole 169 and a fastening tab 180 formed in a plurality of appropriately corresponding positions, respectively. Can be combined.

The DR 120 may include a DR support 121 extending from the bottom of the housing 110 (there may be an alumina support for supporting the DR support 121 at the center), and a top outer peripheral surface of the DR support 121. A dielectric disk 122 extending in the radial direction. The resonant frequency is determined by the capacitance value and the inductance value formed between the capacitive component and the inductive component, that is, the housing 110, the diaphragm 130, the DR 120, and the cover 160. In order to form the required filtering characteristics, the shape and size of the accommodation space of the housing 110, the shape, material and size of the DR 120, etc. are appropriately designed. In the following description, the respective resonant structures having the resonant function by mounting the DR 120 and the like in each accommodation space and the corresponding accommodation space will be referred to as resonant blocks.

As described above, after the DR 120 is mounted in each accommodation space of the housing 110, the cover 160 and the housing 110 are combined to manufacture the RF filter 100, and then an error occurred in the manufacturing process. And correcting an error portion caused by an error on the manufactured part. To this end, a plurality of tuning screws 170 and 175 for fastening the resonance characteristic and the coupling characteristic of the RF filter 100 are fastened to a screw hole (not shown) in the upper cover 160 of the RF filter 100. do.

The tuning screws 170 and 175 are fastened to a position corresponding to the DR 120 to be coupled to the resonance tuning screw 170 used to adjust the resonance characteristics and the coupling windows 131 to 135 to be coupled to each other. The coupling tuning screw 175 used to adjust the characteristics can be divided. Tightening or loosening the tuning screws 170 and 175 adjusts the corresponding resonance characteristics (ie, center frequency) and coupling characteristics (ie, frequency band).

2A is an overall perspective view showing an exemplary structure of an RF filter using a general metal resonant rod, and FIGS. 2B and 2C are cutaway perspective views taken along dashed lines B and C of FIG. 2A, respectively. 2A to 2C, the RF filter 100 using the metal resonant rod has a housing 110 forming a body similarly to the RF filter using the DR shown in FIGS. A resonance block including a receiving space may be formed. However, there is a difference in that each resonant block is provided with a metal resonator rod 220 instead of the DR (120) shown in Figures 1a to 1c.

The RF filter technology using such DR or metal resonant rod is disclosed in Korea Patent Application No. 2002-84938 (name: radio frequency filter having a dielectric having high dielectric constant and high selectivity, Applicant: KM Co., Ltd.) W., inventor: Jong-gyu Park et al., Filed: December 27, 2002 and Patent Application No. 2002-52352 (name: radio frequency filter with spring nut, Applicant: KM Double Oil, Inc., inventor: Jong-kyu Park et al., Filed: August 31, 2002).

The RF filter using such a DR or metal resonant rod is provided in a base station or repeater for transmitting, receiving or relaying an RF signal for wireless communication or broadcasting, and is applied to suppress signal interference between transmission and reception signals or other systems. Various forms and structures have been developed according to the filtering characteristics required.

On the other hand, the base station or repeater typically provides a service for each of a plurality of frequency bands, each of the plurality of frequency bands are provided with RF filters. In this case, in order to connect the RF filters provided for each band in common to one antenna, a filter combiner / divider is provided. At this time, the filter combiner / divider does not have respective structures for the roles of the combiner and the divider, but is the same structure, for example, when combining the signals of the respective RF filters and transmitting them to the antenna side It will serve as your divider and will act as a divider if you receive a signal from the antenna side and distribute it to each RF filter. That is, by changing the input and output stages, the role of the combiner or divider is changed.

3A and 3B are exemplary structural diagrams of conventional RF filters and filter combiners / dividers, and FIG. 3A discloses a planar structure without description of a cover, and in FIG. 3B, one side thereof (a dashed line in FIG. 3A). The structure of the side surface shown by A is disclosed. The RF filters may be integrally formed in one housing for space utilization, and FIGS. 3A and 3B may include, for example, first to fourth RF filters 310, 320, 330, and 340 using DR, and a combination thereof. The structure connecting to the antenna side is shown.

As shown in FIGS. 3A and 3B, each of the RF filters 310, 320, 330, and 340 includes a plurality of accommodation spaces appropriately designed according to the filtering frequency, and DRs provided in the accommodation spaces. For example, the first RF filter 310 may be composed of first to third resonant blocks 312a, 312b, and 312c each consisting of three accommodation spaces and DR provided in the accommodation space. Input and output connectors may be provided in each of the RF filters 310 to 340. The connectors connected to the antenna and receiving the received signals are referred to as input connectors 314, 324, 334, and 344 for convenience. The output side by filtering is referred to as an output connector (311, 321, 331, 341), respectively.

/4 기준에 준하여 설계된다.At this time, the filter combiner / divider for connecting the respective input connectors 314, 324, 334, and 344 of the respective RF filters 310 to 340 with the antenna side in common is the respective input connector 314, 324, 334, and 344. ), The first to fourth connecting copper wires 316, 326, 336, and 346 for connecting the common terminal 356 to the common terminal 356 are main components. The length of each of the first to fourth connecting copper wires 316, 326, 336, and 346 is a corresponding processing frequency.

Designed according to the / 4 standard.

The common terminal 356 is connected to the antenna side. At this time, the antenna terminal connector 351 may be directly provided at the common terminal 356 to be connected to the antenna side. However, in the examples of FIGS. 3A and 3B, the antenna connection connector 351 is formed on the opposite side of the housing forming the filters through the antenna connection copper wire 354 provided separately. This is to form the antenna connector 351 and the output connectors (311, 321, 331, 341) of the respective filters on the same side of the housing, to facilitate the manufacturing and installation work.

The above and conventional filter combiner / divider configurations can be made. However, in the case of configuring the filter combiner / divider in this way, the length of each of the first to fourth connection copper wires 316, 326, 336, and 346 is designed according to the processing frequency, and Difficult to install on the outer side of the housing.

Accordingly, an object of the present invention is to provide a filter combiner / divider that is easy to design and install, which can increase space utilization and have excellent performance.

In order to achieve the above object, the present invention provides an RF (Radio Frequency) filter composed of a plurality of resonant blocks configured by using a dielectric resonator (DR) or a metal resonator rod provided in the accommodation space and the accommodation space. In the filter combiner / divider for connecting in common, each of the first or last resonant block of the RF filters to be connected and the receiving space for the resonance formed by a plurality of neighboring diaphragm directly adjacent to each preset side and ; A plurality of coupling windows formed in the plurality of diaphragms; A structure of a resonance block having a metal resonance rod installed inside the resonance accommodation space; When the resonant block of a neighboring RF filter is configured using the DR, the coupling window is formed at a predetermined distance from the upper housing at the top of the corresponding diaphragm, and the diaphragm is set to be higher than the height of the DR. And an upper housing and the predetermined gap so as to form a corresponding coupling window.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims. It will be obvious to those who have.

4 is a structural diagram of an RF filter and a filter combiner / divider according to an exemplary embodiment of the present invention, and discloses a planar structure without a description of a cover. Referring to FIG. 4, for example, filter combiners for connecting the first to fourth RF filters 410, 420, 430, and 440 using DR and the antenna side by connecting them in common according to the characteristics of the present invention. The structure of the divider 450 is shown.

As shown in FIG. 4, each of the RF filters 410, 420, 430, and 440 includes a plurality of resonant blocks including a plurality of accommodating spaces appropriately designed according to the filtering frequency and DRs provided in the accommodating spaces. It is composed. For example, the first RF filter 410 may be composed of first to fourth resonant blocks 412a, 412b, 412c, and 412d including four accommodation spaces and four DRs respectively provided in the accommodation spaces. have. Each RF filter 410 to 440 may be provided with output connectors 411, 421, 431, and 441 for outputting a signal received from an antenna.

In this case, the filter combiner / divider 450 for connecting each of the RF filters 410 to 440 to the antenna side in common is a resonant block including a resonant accommodating space and a metal resonant rod of a suitable shape inside the corresponding housing. It may have a form. The first stage resonant blocks 412d, 422f, 432d, and 442c at the input side of each of the RF filters 410 to 440 are directly adjacent to the sides of the resonant block of the filter combiner / divider 450. Will have

FIG. 5 is a detailed structural view of the filter combiner / divider of FIG. 4, and FIG. 6 is a side view illustrating the filter combiner / divider of FIG. 5. 5 and 6, the structure of the filter combiner / divider 450 according to the present invention will be described in more detail. The filter combiner / divider 450 having a resonance block structure may include first to fourth RF. Each of the first stage resonant blocks 412d, 422f, 432d, and 442c has a structure adjacent to each of the first stage resonant blocks 412d, 422f, 432d, and 442c. 415d, 425f, 435d, and 445c, each having a structure in which coupling is made by coupling windows 416, 426, 436, and 446 provided at the upper end of each of the diaphragms 415d, 425f, 435d, and 445c. .

The filter combiner / divider 450 having the resonance block structure includes a metal resonance rod 451 to perform a resonance operation. In this case, the resonance frequency band of the metal resonance rod 451 is the frequency of four RF filters. It is set to a relatively wide band that covers all of the bands. In addition, by connecting the upper end of the metal resonance rod 451 and the antenna connection copper wire 456 to make the cover of the broadband more easily.

At this time, the respective DR 414d, 424f, 434d of the metal resonant rod 451 of the resonant block forming the filter combiner / divider 450 and the resonant blocks 412d, 422f, 432d, and 442d of the surrounding RF filters. , 444c) should have a structure to facilitate the RF signal coupling. As a conventional diaphragm and coupling window structure, RF signal coupling between the DR and neighboring resonant bars between neighboring resonant blocks is not performed.

In detail, the magnetic field direction in DR occurs from the top surface of the dielectric disk to the bottom surface direction or from the bottom surface to the top surface direction, and the magnetic field direction of the metal resonance rod is generated in the direction of rotation clockwise or counterclockwise about the axis on which the resonance rod is placed. do. Therefore, as shown in FIGS. 4 to 5, when the DR and the metal resonant rod are provided, the magnetic field direction between the metal resonant rod and the dielectric disc does not match, making it difficult to couple the RF signal.

Accordingly, in the present invention, the DR (414d, 424f, 434d) of each of the resonant blocks 412d, 422f, 432d, and 442d of the resonant blocks 412d, 422f, 432d, and 442d of the peripheral RF filters of the resonant block forming the filter combiner / divider 450 are shown. In order to facilitate the RF signal coupling with the 444c, the coupling windows 416, 426, 436, and 446 are not separated from each other. , 425f, 435d, and 445c are formed as some fine gap d1 between the top of the cover and 460 in FIG. The height of each of the diaphragms 415d, 425f, 435d, and 445c is set to be equal to or higher than the height of each of the DRs 414d, 424f, 434d, and 444c, and to have a distance d1 from the upper cover 460 of FIG. Appropriately set, each coupling window 416, 426, 436, 446 is formed.

Metal resonance rods of the resonant block forming the filter combiner / divider 450 by the diaphragms 415d, 425f, 435d, 445c and the coupling windows 416, 426, 436, and 446 having such a structure. RF signal coupling between the 451 and the resonant blocks 412d, 422f, 432d, and 442d of the peripheral RF filters with the respective DRs 414d, 424f, 434d, and 444c is smoothly performed.

On the other hand, since the coupling windows 416, 426, 436, and 446 of such a structure have a small spacing (for example, 3 mm), a structure in which a conventional tuning screw or the like is installed to adjust the coupling characteristics is employed. Is difficult. Accordingly, in the present invention, a tuning window 413d, 423f, 433d, 443c having an appropriate structure is formed on one side of each of the diaphragms 415d, 425f, 435d, and 445c, and a tuning screw (not shown) is formed on the cover of the corresponding position. ) To adjust the coupling characteristics.

At this time, as shown in Figure 5, each of the tuning window (413d, 423f, 433d, 443c) formed in each of the diaphragm (415d, 425f, 435d, 445c), the metal resonance rod, to prevent the coupling performance is lowered The center of 451 and the center of the corresponding DR 414d, 424f, 434d or 444c do not directly face each other, the portion of the edge of the metal resonant rod 451 and the edge of the corresponding DR 414d, 424f, 434d or 444c. It is installed in a proper position so that a part faces each other.

In FIG. 6, for example, the distance d2 with the cover 460 formed by the tuning window 433d as compared to the distance d1 due to the coupling window 436 between the third diaphragm 435d and the cover 460. You can see this very wide. In this case, a screw hole (not shown) may be formed in the cover 460 of the upper portion of the tuning window 433d, and the tuning screw (not shown) may be fastened thereto so that the coupling characteristics may be properly tuned.

FIG. 7 is an equivalent circuit diagram of FIG. 4. As shown in FIG. 7, the first to fourth RF filters 410, which are represented by a plurality of LC parallel resonant circuits connected in series (by the number of corresponding resonant blocks), are illustrated. , 420, 430, and 440 are commonly connected by the filter combiner / divider 450, so that the circuit structure is commonly connected to the antenna.

FIG. 8 is a structural diagram of an RF filter and a filter combiner / divider according to another embodiment of the present invention, and discloses a planar structure in which a cover is omitted. FIG. 9 is an equivalent circuit diagram of FIG. 8. 8 and 9, for example, a structure of the first to third RF filters 610, 620, and 630 using DR and a filter combiner / divider 650 that combines them and connects them to the antenna side is illustrated. It is shown.

As shown in Figures 8 and 9, the filter combiner / divider 650 according to another embodiment of the present invention is three compared to the filter combiner / divider 450 shown in Figures 4-7 It can be seen that the structure is coupled to the RF filter (610, 620, 630). In addition, the filter combiner / divider 650 shown in FIGS. 8 and 9 has a structure of a resonant block using a metal resonant rod, and the filter combiner / divider 650 and the surrounding RF filters 610, The design principle of the diaphragm and coupling window with 620 and 630 is the same as in the structure shown in FIGS. 4 to 7.

However, as shown in FIGS. 8 and 9, at least one of the RF filters 610, 620, and 630 to be combined (the first RF filter 610 in the example of FIGS. 8 and 9) may require a filtering frequency band and According to an appropriate filter design, the resonator block of the filter combiner / divider 650 itself may be used as part of its LC parallel resonant circuit. As such, the resonant block of filter combiner / divider 650 may be suitably used as part of the RF filter, which may be more efficient in terms of space utilization. Of course in this case

As described above, the filter combiner / divider according to the embodiments of the present invention may be configured, while the above-described description of the present invention has been described with respect to specific embodiments, but various modifications may be made without departing from the scope of the present invention. Can be. For example, in the above description, the resonant block of the filter combiner / divider is constructed using a metal resonant rod, but in addition to the metal resonant rod, the resonant block may also be configured as DR. However, since the resonant frequency band of the DR is relatively narrow band, it is easier to use the metal resonant rod to cover all the filtering bands of the plurality of RF filters. In addition, in the above description, each RF filter has been described as configuring a resonant block using DR. In addition, at least a part of each RF filter may be configured using a metal resonant rod. As described above, when the filter combiner / divider of the present invention is configured using a metal resonant rod, a structure of a diaphragm and a coupling window of a conventional type is formed to connect an RF filter constructed using the metal resonant rod. can do.

In addition, there may be various embodiments of the present invention, and therefore, the scope of the present invention should be determined by the claims and the equivalents of the claims.

As described above, the filter combiner / divider according to the present invention is easy to design and install, increases space utilization and has excellent performance.

Claims (5)

Filter combiner for commonly connecting RF (Radio Frequency) filters composed of a plurality of resonant blocks configured by using a dielectric resonator (DR) or a metal resonant rod provided in the accommodation space / In the divider, A resonance accommodating space formed between each first or last resonant block of the RF filters to be connected in common and a diaphragm interposed therebetween; A plurality of coupling windows formed in the plurality of diaphragms, It includes a structure of a resonant block having a metal resonator rod installed in the resonance receiving space, When the resonant block of the neighboring RF filter is configured using the DR, the coupling window is formed at a predetermined distance from the upper housing at the top of the corresponding diaphragm, and the diaphragm is the resonant block of the neighboring RF filter. The filter combiner / divider is set to be equal to or higher than the height of the DR, and formed to have a predetermined distance from the upper housing, the coupling window. The filter combiner / divider of claim 1, wherein an upper end of the metal resonance rod of the resonance block constituting the filter combiner / divider is connected to an external connection line. The filter combiner / divider of claim 1, wherein a tuning window is formed in each of the plurality of diaphragms for coupling tuning, and a tuning screw is installed through a screw hole in an upper housing at a corresponding position of the tuning window. . The method of claim 3, wherein the plurality of tuning windows, when the resonant block of the RF filter is configured using the DR, the center of the DR and the center of the metal resonant rod of the resonant block of the filter combiner / divider Filter combiner / divider, characterized in that formed in a position not directly facing each other through the corresponding tuning window. The structure of any one of claims 1 to 4, wherein the structure of the resonant block constituting the filter combiner / divider comprises resonant blocks forming a corresponding RF filter in at least one of the RF filters to be combined. Filter combiner / divider characterized in that it is used as part of.

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