KR101033506B1 - Wide band resonance filter having coupling device - Google Patents

Abstract

PURPOSE: A broadband resonator filter including a coupling device is provided to secure a broadband width by increasing the coupling amount of a resonator and an input and output port. CONSTITUTION: A housing(110) has a plurality of cavities partitioned with a preset space. An input side connector(120) and an output side connector(130) are fitted from both outer sides to both inner sides of the housing. An input side coupling device(170) and an output side coupling device(180) are fitted into the input side connector and the output side connector in the housing. A plurality of resonators(141,142,143,144) are formed on a plurality of cavities and are arranged between the input side connector and the output side connector. An input side conductive wire(151) electrically connects one resonator to the input side coupling device. An output side conductive wire electrically connects another resonator to the output side coupling device. The input side coupling device and the output side coupling device are comprised of a hollow plate member and a plate rod member with a hole.

Description

Wide band resonance filter having coupling device

The present invention relates to a wideband resonant filter, and more particularly, to a wideband resonant filter having a coupling element capable of securing a wider bandwidth by increasing the amount of coupling between an input / output port and a resonator.

The RF filter is a device that passes only signals of a predetermined frequency band. The low pass filter, band pass filter, high pass filter, and band stop filter (or band reject filter, notch filter) according to the frequency band to be filtered. ) And the like.

Important characteristics of the filter include insertion loss and skirt characteristics. Here, the insertion loss means power lost while the signal passes through the filter, and the skirt characteristic means a steep passband and stopband of the filter.

Insertion loss and skirt characteristics are trade off from each other depending on the order of the filter. In other words, the higher the order of the filter, the better the skirt characteristics but the worse the insertion loss.

In addition, such filters may be classified into lumped element filters, transmission line (microstrip / stripline) filters, ceramic / dielectric filters, waveguide filters, surface acoustic wave (SAW) filters, and the like.

Among them, the waveguide filter directly uses a resonance phenomenon, and there are a cavity method using a metal block and a ceramic method of inserting a dielectric material. Such waveguide filters are widely used in the case of using large power, such as in the case of satellites or mobile communication base stations.

Hereinafter, a broadband resonance filter according to the prior art will be described with reference to the accompanying drawings.

1 is a plan view of a broadband resonant filter according to the prior art, FIG. 2 is a side cross-sectional view of the wideband resonant filter shown in FIG. 1, and FIG. 3 is a detailed view of an input port of the wideband resonant filter shown in FIG. 2.

1 to 3, the broadband resonant filter according to the related art is composed of a rectangular parallelepiped having an open top, a housing 10 having a plurality of cavities partitioned at predetermined intervals, and a housing ( 10) the input connector 20 and the output connector 30 fitted to both sides, the first to fourth resonators 41, 42, 43, 44 formed in each of the plurality of cavities, the input connector 20 and The first wire 51 electrically connects the first resonator 41 and the second wire 52 electrically connects the output connector 30 and the fourth resonator 44.

Here, the plurality of cavities are a plurality of first to third partitions 61 and 62 in which windows of a predetermined size are formed to adjust the coupling between the first to fourth resonators 41, 42, 43, 44. (63).

Meanwhile, referring to FIG. 3 showing in detail between the input connector 20 and the first resonator 41, the first wire 51 has one end connected to the center bar 21 of the input connector 20 and the other end thereof. It is connected to one side of the outer circumferential surface of the first resonator 41. In this case, one end and the other end of the first wire 51 are soldered by the first soldering member 71 and the second soldering member 72 on one side of the outer circumferential surface of the central rod 21 and the first resonator 41, respectively. Connected.

Referring to the operation of the conventional broadband resonant filter, the radio frequency signal applied to the input connector 20 formed on one side of the housing 10 is the first to fourth resonators (41, 42, 43) formed in each cavity Is resonated by 44). Then, filtering is performed while proceeding to each of the first to fourth resonators 41, 42, 43, 44. At this time, the radio frequency signal proceeds while being coupled toward the window provided in each cavity, and the order in which the radio frequency signal proceeds proceeds to the first to fourth resonators 41 (42) 43 (44). That is, the coupling proceeds from the input connector 20 to the resonator provided from the output connector 30.

The first wire 51 electrically connects the input connector 20 and the first resonator 41, and the second wire 52 electrically connects the output connector 30 and the fourth resonator 44. To secure the bandwidth of the frequency passing through the broadband resonant filter.

4 is a graph for explaining the characteristics of the broadband resonance filter according to the prior art. Referring to FIG. 4 which shows the S parameter of the filter showing the reflection coefficient S1.1 and the transmission coefficient S2.1 of the broadband resonant filter according to the prior art, the center frequency Fc is 1.795 GHz to 1.88 GHz. GHz and bandwidth is 170 MHz. Therefore, it can be seen that a bandwidth of about 10% is secured based on the center frequency.

In other words, such a conventional wideband resonant filter has about 10% of the available frequency bandwidths left and right, and when applied to a diplexer that is a multiband combiner or a complex filter, the bandwidth of the wideband frequency is increased. There was a significant limitation in securing bandwidth.

In order to solve this problem, as a simple technique for increasing the bandwidth, the material or the thickness of the first wire 51 or the second wire 52 may be different, but also in the case of optimizing the material or thickness of the wire There will be a limit on securing bandwidth.

In addition, there may be a method of adding a conductive material such as a resonator between the input connector 20 and the first resonator 41, and the output connector 30 and the fourth resonator 44. In addition to the problem of insertion loss due to the increase of the order, the size (volume) of the resonant filter itself is inevitably increased, and the weight is increased, so that equipment (for example, base station and base station antenna) employing a wideband resonant filter is increased. It causes problems that cannot be reduced.

Accordingly, the present invention is to solve all the disadvantages and problems of the prior art as described above, the present invention is provided with a coupling element that can secure a wider bandwidth by increasing the amount of coupling between the input and output ports and the resonator It is an object to provide a wideband resonant filter.

Broadband resonant filter of the present invention for achieving the above object, the housing is formed a plurality of cavities (cavity) partitioned therein; An input side connector and an output side connector which are respectively fitted from the outside to the inside of the housing; An input side coupling element and an output side coupling element respectively fitted to the input side connector and the output side connector inside the housing; A plurality of resonators formed in each of the plurality of cavities and disposed between the input side and output side connectors; An input side conductive wire electrically connecting one resonator closest to the input side coupling element; And an output side conductive wire for electrically connecting another resonator closest to the output side coupling element.

Here, each of the input side connector and the output side connector, it is preferable that the connector rod member of a predetermined length is formed in the housing, respectively, and electrically connected to the input side coupling element and the output side coupling element.

Each of the input side coupling elements and the output side coupling elements is preferably composed of a hollow plate member and a plate rod member having a hole fitted into the hollow of the plate member and into which the connector rod member is fitted.

On the other hand, each of the input coupling element and one resonator, and the output coupling element and the other resonator, it is preferable that the insertion grooves into which the input side conductive wire and the output side conductive wire are respectively inserted a predetermined depth.

In addition, the input conductive wire and the output conductive wire are preferably soldered to the insertion groove.

In addition, the input side coupling element and the output side coupling element are preferably composed of a circular or rectangular plate having a predetermined thickness to form an insertion groove.

Here, the input coupling element and the output coupling element are preferably arranged so that their centers coincide with each other, and a resonator is preferably arranged on an imaginary line connecting the centers.

According to the present invention, a wider bandwidth can be secured by increasing the coupling amount between the input / output port and the resonator. Therefore, when applied to a diplexer or a multiband combiner that uses different frequency bands, the attenuation is reduced. In addition, the bandwidth can be secured without loss of passband, thereby improving communication reliability.

1 is a plan view of a broadband resonant filter according to the prior art,
2 is a side cross-sectional view of the wideband resonant filter shown in FIG. 1;
3 is a view showing in detail the input port of the broadband resonant filter shown in FIG.
4 is a graph for explaining the characteristics of the broadband resonant filter shown in FIG.
5 is a plan view of a broadband resonant filter having a coupling element according to the present invention;
FIG. 6 is a side cross-sectional view of the broadband resonant filter with the coupling element shown in FIG. 5;
7 is a view for explaining in detail the input port and the resonance period coupling element of the broadband resonant filter having the coupling element shown in FIG.
8 is a view for explaining in detail the input port and the resonance period coupling element of the broadband resonant filter having the coupling element shown in FIG.
FIG. 9 is a graph for explaining the characteristics of the wideband resonant filter including the coupling element shown in FIG. 5.

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

In addition, the terms used in the present invention were selected as general terms widely used as possible at present, but in certain cases, the term is arbitrarily selected by the applicant, in which case the meaning is described in detail in the description of the invention.

In addition, in describing the embodiments, descriptions of technical contents which are well known in the technical field to which the present invention pertains and which are not directly related to the present invention will be omitted, which obscures the gist of the present invention by omitting unnecessary descriptions. To communicate more clearly.

5 is a plan view of a wideband resonant filter with a coupling element according to the present invention, FIG. 6 is a side cross-sectional view of a wideband resonant filter with a coupling element shown in FIG. 5, and FIG. 7 is a coupling shown in FIG. 6. The input port and the resonance period coupling element of the broadband resonant filter including the element in detail. FIG. 8 illustrates the input port and the resonance period coupling element of the broadband resonant filter including the coupling element shown in FIG. 6. It is a figure for demonstrating in detail.

As shown in FIGS. 5 to 8, the broadband resonant filter including the coupling element according to the present invention includes a rectangular parallelepiped having an open top, and a housing having a plurality of cavities partitioned at predetermined intervals therein. 110, the eleventh to fourteen resonators 141, 142, 143 and 144 formed in each of the plurality of cavities, and the eleventh to fourteen resonators 141, 142, 143 and 144 The input connector 120 and the output connector 130 which are fitted into the housing 110 from the outside from both sides in one direction, and the input connector 120 and the output connector 130 inside the housing 110, respectively An electrical coupling between the input coupling element 170 and the output coupling element 180 and the eleventh resonator 141 which is a resonator closest to the input coupling element 170 among the input coupling element 170 and the resonator; Output side of input conductive wire 151 and output side coupling element 180 and resonator It is configured to include a sampling device 180 last output-side conductive wire 152 for electrically connecting the other one of the resonators of the resonator 14, 144 in contact with the.

Here, the plurality of cavities include a plurality of eleventh to thirteenth partitions 161 (windows having a predetermined size in order to adjust the amount of coupling between the eleventh to fourteen resonators 141, 142, 143, and 144). 162). The input coupling element 170 and the output coupling element 180 may be made of at least one conductive material of aluminum (Al), iron (Fe), copper (Cu), and silver (Ag), or may be plated with brass. Can be used.

Meanwhile, referring to FIGS. 7 to 8, which illustrate the input side connector 120, the first resonator 141, and the input side coupling element 170, which are input side ports, the input side coupling element 170 is a hollow plate member 171. ) And a plate rod member 172 having a plate rod member hole 173 fitted into the hollow of the plate member 171 and into which the connector rod member 121 is fitted. Here, the connector rod member 121 is fitted into the plate rod member hole 173 of the plate rod member 172. In addition, an insertion groove 174 into which one end of the input conductive wire 151 is inserted is formed at one outer peripheral surface of the plate member 171.

Here, the other end of the input conductive wire 151 is connected to one side of the outer circumferential surface of the eleventh resonator 141. At this time, one end and the other end of the input side wire 151 is the eleventh soldering member 191 and the twelfth soldering member (1) on the outer peripheral surface of the insertion groove 174 and the eleventh resonator 141 of the plate member 171, respectively ( 192 is soldered and connected.

As described above, the operation of the broadband resonant filter of the present invention includes the eleventh through fourteen resonators 141 and 142 formed in the respective cavities of the wideband RF signal applied to the input connector 120 formed at one side of the housing 110. 143, 144 is resonated by.

Then, filtering is performed while proceeding to each of the eleventh to fourteen resonators 141, 142, 143, and 144. At this time, the radio frequency signal proceeds while being coupled toward the windows provided in each cavity, and the order in which the radio frequency signals proceed is proceeded to the eleventh to fourteen resonators 141, 142, 143, and 144.

That is, the coupling proceeds from the input side connector 120 to the resonator installed from the output side connector 130. At this time, the amount of coupling between the input connector 120 and the eleventh resonator 141 and the output connector 130 and the fourteenth resonator by the input coupling element 170 and the output coupling element 180 formed of a conductive material. The amount of coupling between 144 is increased.

As such, as the amount of coupling increases, a bandwidth of a frequency passing through the wideband resonance filter may be improved.

In other words, the input side connector 120 and the output side connector 130, which are input / output ports, have a wider bandwidth as the amount of electrical coupling, that is, the coupling amount, with each nearest resonator is increased. In this case, the amount of coupling is proportional to the area of each of the input side coupling element 170 and the output side coupling element 180, the distance between the input side connector 120 and the input side coupling element 170, and the output side connector 130. ) Is inversely proportional to the distance between the coupling element 180 and the output side coupling element 180.

The input coupling element 170 and the output coupling element 180 need not be particularly limited in form to increase the input / output coupling amount. However, the input coupling element 170 and the first resonator 141 are not limited thereto. In order to form an insertion hole 174 into which the input side conductive wire 151 is electrically connected, the plate member 171 is a circular plate or a square plate having a thickness relatively thicker than the diameter of the input side conductive wire 151. It is preferable to construct, since the shape of the jig or die used at the time of plate manufacture is generally circular or square.

In addition, in mounting the circular plate or the square plate, the plate member 171 on the input side and the output side is mounted so that the centers of the plates coincide with each other, and the resonator is disposed on an imaginary line connecting the centers of the plates. The most coupling amount can be increased.

FIG. 9 is a graph for explaining the characteristics of the wideband resonant filter including the coupling element shown in FIG. 5. As shown in FIG. 9, the S parameters of the filter showing the reflection coefficient S1.1 and the transmission coefficient S2.1 of the broadband resonant filter having the coupling element according to the present invention are 1.71 GHz to 2.17 GHz. The frequency Fc is 1.94 GHz and the bandwidth is 460 MHz. Accordingly, it can be seen that a bandwidth of about 20 to 25% can be secured based on the center frequency.

Therefore, the wideband resonant filter including the coupling element of the present invention has a frequency bandwidth of about 20 to 25% of the center frequency, and when applied to a diplexer that is a multiband combiner or a complex filter, a wider bandwidth can be obtained. It can be confirmed that it can be secured, and as the coupling element is made of a conductive material, no attenuation or passband loss occurs.

Accordingly, the cellular mobile communication system of the second generation mobile communication system uses an 800 MHz band, the PCS mobile communication system uses a 1.8 GHz band, and the third generation mobile communication system uses a 2.1 GHz band. In the case of using the broadband resonant filter provided with the second generation mobile communication service and the third-generation mobile communication service can be used for the diplexer for providing.

As described above, the present invention has been described through the preferred embodiments, which are intended to help the understanding of the present invention, but are not intended to limit the technical scope of the present invention.

Therefore, it should be understood that various changes and modifications can be made by those skilled in the art to which the present invention pertains.

For example, in the description and drawings of the present invention, the filter having four resonators is taken as an example, but the number of resonators is not limited thereto, and the material of the conductive wire is not particularly limited.

In addition, although the input coupling element and the output coupling element are also examples of shapes such as a circle and a square, such a shape is not particularly limited as long as it is a structure or a shape that is easily coupled with a wire.

110 housing 120 input side connector
121: connector rod member 130: output connector
141, 142, 143, 144: resonators 151, 152: conductive wire
161, 162, 163: partition 170: input side coupling element
171: plate member 172: plate rod member
173: plate rod member hole 174: insertion groove
180: output side coupling element 191, 192: soldering member

Claims (7)

A housing in which a plurality of cavities are formed, partitioned at predetermined intervals therein;
An input side connector and an output side connector fitted into the housing from the outside of the both sides of the housing;
An input side coupling element and an output side coupling element respectively fitted to the input side connector and the output side connector inside the housing;
A plurality of resonators formed in each of the plurality of cavities and disposed between the input side and output side connectors;
An input side conductive wire electrically connecting one resonator closest to the input side coupling element; And
And an output side conductive wire for electrically connecting another resonator closest to the output side coupling element;
Each of the input side connector and the output side connector,
Connector rod members having a predetermined length are respectively formed in the housing and electrically connected to the input side coupling element or the output side coupling element.
Each of the input side coupling element and the output side coupling element,
Hollow plate member,
And a plate rod member having a hole fitted into the hollow of the plate member and into which the connector rod member is fitted. delete delete The method of claim 1,
Each of the input side coupling element and the one resonator, and the output side coupling element and the other resonator,
Broadband resonant filter having a coupling element, characterized in that the insertion grooves are formed in which the input side conductive wire and the output side conductive wire are respectively inserted a predetermined depth. The method of claim 4, wherein
And the input side conductive wire and the output side conductive wire are soldered to the insertion groove. The method of claim 4, wherein
The input side coupling element and the output side coupling element,
Broadband resonant filter with a coupling element, characterized in that consisting of a circular or rectangular plate of a predetermined thickness to form the insertion groove. The method of claim 6,
The input coupling element and the output coupling element are arranged such that their centers coincide with each other, and the resonator is arranged on an imaginary line connecting the centers. filter.

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