KR20110054899A - Radio frequency filter - Google Patents

Abstract

PURPOSE: A radio frequency filter is provided to miniaturize the size of a filter, thereby saving the manufacturing costs of the radio frequency filter. CONSTITUTION: A lower housing(101) receives at least two crossing blocks(111,113). The lower housing comprises a partition wall(107) which separates two cavities(102,103). An upper cover(105) is coupled with the upper part of the lower housing to close the cavities. Input/output connectors(131,133) are coupled with the lower housing and are connected to the cavities respectively. A coupling unit couples electrical fields and magnetic fields between the crossing blocks.

Description

High Frequency Filter {RADIO FREQUENCY FILTER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio frequency filter, and more particularly to a high frequency filter having a dielectric resonant element.

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. Resonant circuits by common coils and capacitors are not suitable for forming very high frequencies due to their large radiation losses. The RF filter forms a cavity such as a metallic cylinder or a cube surrounded by a conductor, and a dielectric resonance element (DR) is installed therein. The RF filter having such a structure can improve attenuation characteristics by forming a plurality of cavities and installing a dielectric resonant element in each cavity. However, RF filters in which dielectric resonance elements are installed in a plurality of cavities have a problem that their size becomes relatively large. In order to solve this problem, the dielectric resonating element is integrally bonded to the housing of the filter to form a filter.

The above-described RF filter may be classified into a TM (Transverse Magnetic) mode, a TEM (Transverse Electro Magnetic) mode, a TE (Transverse Electric) mode, etc., according to the structure of the resonator. This excellent TM mode resonator is described in US Pat. For example, the bar.

The TM mode resonator has a higher quality factor than the conventional TEM mode resonator (cavity filter structure), and thus shows about 40% improved quality factor at the same size. In addition, a TE mode resonator filter employing a similar dielectric resonator has a characteristic of having a high quality factor of about 3 times that of a TEM mode resonator. In general, however, the TE mode resonator filter requires a relatively large volume, which makes it difficult to miniaturize it.

SUMMARY OF THE INVENTION The present invention has been made in view of the foregoing, and an object thereof is to provide a resonator filter having a relatively small size while operating in a transverse electric (TE) mode.

In order to achieve the above object, the high frequency filter according to the present invention includes at least two intersection blocks and at least two cavities, each of which accommodates the at least two intersection blocks, and which is open at an upper portion thereof. A lower housing including a partition wall separating each other from each other, an upper cover coupled to an upper portion of the lower housing with an upper portion closed to close the at least two cavities, and coupled to the at least two cavities, respectively. An input and output connector, a coupling portion for coupling an electric field and a magnetic field between the two intersecting blocks, at least one end protruding into the cavity through the upper cover, and a length protruding into the cavity when rotating Includes a tuning adjustment screw.

According to the high frequency filter of the present invention, as the operation of the TE (Transverse Electric) mode with a relatively good quality coefficient, the insertion loss is excellent effect.

Mechanically, the size of the filter can be miniaturized, thereby reducing the manufacturing cost of the high frequency filter.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Specific details appear in the following description, which is provided to help a more general understanding of the present invention, and it is common knowledge in the art that such specific matters may be changed or modified within the scope of the present invention. It is self-evident to those who have.

1 is a perspective view illustrating a configuration of a high frequency filter according to a first embodiment of the present invention, FIG. 2A is a plan view of a high frequency filter according to a first embodiment of the present invention, and FIG. 2B is a line II ′ of FIG. 2A. The front view of the high frequency filter which cut | disconnected.

1, 2A, and 2B, the high frequency filter according to the first embodiment of the present invention includes a lower housing 101, an upper cover 105 covering the lower housing 101, and the lower housing 101. First and second intersecting blocks 111 and 113 accommodated in the inner cavity of the c), and input and output terminals 131 and 133 coupled to the lower housing 101.

The lower housing 101 has at least two cavities, ie, a first cavity 102 and a second cavity 103, in which the first and second cross blocks 111 and 113 may be accommodated and fixed. The first cavity 101 and the second cavity 103 are separated from each other in the same size by a central partition 107 provided at the center of the lower housing 101.

The upper cover 105 is mounted on the upper portion of the lower housing 101 so that the first cavity 102 and the second cavity 103 provided in the lower housing 101 are closed. The upper cover 105 and the lower housing 101 are joined to the lower housing 101 by combining with solder, adhesive, or the like, or assembled by other methods.

The first cavity 102 and the second cavity 103 provided in the lower housing 101 have an inner lower surface of the lower housing 101, an inner sidewall of the lower housing 101, and a central partition 107, respectively. Enclosed by an upper surface of the upper cover 105. Accordingly, the first cavity 102 and the second cavity 103 each have a hexahedron shape.

In the high frequency filter according to the first embodiment of the present invention, the first and second cross blocks 111 and 113 are preferably fixed to the lower housing 101 by alumina ceramic. Further, in order to easily fix the first and second cross blocks 111 and 113, the upper cover 105 supports the first cross block 111 to support the first cross block 111 at the top of the first cross block 111. The lower housing 101 is provided with a lower support 116 for supporting the first cross block 111 at the upper portion of the first cross block 111. Likewise, the upper support 117 and the lower support 118 are provided on the upper and lower portions of the second cross block 113, respectively.

Meanwhile, the first intersecting block 111 includes first and second dielectric resonating elements 111a and 111b, and the first and second dielectric resonating elements 111a and 111b are provided to cross each other. For example, the first and second dielectric resonating elements 111a and 111b may be provided to cross each other in a cross shape. In addition, the first cross block 111 provided in the high frequency filter according to the first embodiment of the present invention has four interior parts in which end portions of the first and second dielectric resonators 111a and 111b are provided in the lower housing 101. It is fixed to face the side wall.

In addition, one end portion in the longitudinal direction of the first and second dielectric resonators 111a and 111b, that is, the end portion of the first intersecting block 111 facing the four inner sidewalls has a rounded top and bottom edges. Prepared.

Similarly, the second cross block 113 also has the same structure as the first cross block 111 and is arranged in the same form as the first cross block 111.

The input and output terminals 131 and 133 are coupled to the first cavity 102 and the second cavity 103, respectively. Furthermore, the input terminal 131 includes an input internal terminal 132 that provides an RF signal input from the outside to the first cavity 102 inside the lower housing 101, and the output terminal 133 is formed of a first input terminal 133. An output internal terminal 134 for transmitting an RF signal provided from the two cavities 103 to the outside is provided. Accordingly, the input terminal 131 provides the RF input to the outside through the input inner terminal 132 to the first cavity 102 inside the lower housing 101, and the output terminal 133 is the first terminal. The RF signal filtered through the cavity and the second cavity 102 and 103 is received through the output internal terminal 134 and transmitted to the outside.

Preferably, the input and output terminals 131 and 133 may be coupled in the same direction. By combining the input and output terminals 131 and 133 in the same direction, it is possible to mount the cable to the input and output terminals 131 and 133 in one direction, thereby realizing the convenience of cable mounting and the time required for the cable mounting. Can be effectively reduced.

Furthermore, the high frequency filter according to the first embodiment of the present invention includes tuning adjustment screws 141, 142, 143 and 144 for adjusting the resonance frequency. The tuning adjustment screws 141, 142, 143, and 144 may be fixed to the upper cover 105 to be provided close to the first and second intersecting blocks 111 and 113 in the first and second cavities 102 and 103.

For example, the first and second tuning adjustment screws 141 and 142 are mounted to the upper cover 105 so as to be rotatable and fixable, and the first and second holes of the first and second tuning adjustment screws 141 and 142 are rotated. Protruding portion 102 is provided to be inserted or withdrawn to the end side of the first and second dielectric resonating elements (111a, 111b). Similarly, the third and fourth tuning adjustment screws 143 and 144 may be mounted to the upper cover 105 to be rotatable and fixed, and may be inserted into or withdrawn from the end sides of the third and fourth dielectric resonating elements 113a and 113b. It is provided. As the tuning adjustment screws 141, 142, 143 and 144 configured as described above are individually rotated forward (that is, clockwise), the tuning adjustment screws 141, 142, 143 and 144 are inserted into the first cavity 102 and the second cavity 103, respectively. As the tuning adjustment screws 141, 142, 143 and 144 are rotated in the reverse direction (that is, counterclockwise), the tuning adjustment screws 141, 142, 143 and 144 are drawn out from the side of the first cavity 102 and the second cavity 103. The resonance frequency of the high frequency filter may be adjusted by rotating the tuning adjustment screws 141, 142, 143, and 144.

On the other hand, the high frequency filter according to the first embodiment of the present invention is the first cavity 102 and the first by the first and second intersection blocks 111 and 113 mounted on the first cavity 102 and the second cavity 103. Coupling cavity 121 and coupling adjustment screws 123, 125, and 127 coupled to the upper cover 105 for coupling the resonant frequencies in the two cavities 103 to each other. The coupling cavity 121 is provided in a form in which a portion of the central partition 107 separating the first cavity 102 and the second cavity 103 is cut out. The coupling cavity 121 may be formed at various positions based on the distribution of the electric field and the magnetic field between the first cavity 102 and the second cavity 103.

In addition, the coupling adjustment screws 123, 125, and 127, that is, the first, second, and third coupling adjustment screws 123, 125, and 127 are mounted to the upper cover 105 so as to be rotatable and fixable. The first coupling adjusting screw 123 is inserted into or spaced between the first and second dielectric resonating elements 111a and 111b provided by the first crossing block 111 accommodated in the first cavity 102. It is provided to be withdrawn. Similarly, the second coupling adjusting screw 125 is a space between the first and second dielectric resonating elements 113a and 113b provided by the second crossing block 113 accommodated in the second cavity 103. It is provided to be inserted or withdrawn to the side. The third coupling adjusting screw 127 is provided to be inserted into or withdrawn from the coupling cavity 121 formed in the central partition wall 107.

With reference to the detailed description and drawings of the present invention, although the position of the tuning adjustment screws (141, 142, 143, 144) and coupling adjustment screws (123, 125, 127) for adjusting the resonance frequency and coupling of the high frequency filter in the first embodiment, The present invention is not limited to this. The positions of the tuning adjustment screws 141, 142, 143, 144 and the coupling adjustment screws 123, 125, 127 may be installed in various ways depending on the resonant frequency and coupling of the high frequency filter. In addition, the number of tuning adjustment screws (141, 142, 143, 144) and coupling adjustment screws (123, 125, 127) can also be variously applied.

3A and 3B are diagrams illustrating an electric field and a magnetic field distribution of the first cross block 111 provided in the high frequency filter according to the first embodiment of the present invention. The high frequency filter according to the first embodiment described above operates in the TE mode, and when the TE mode is operated, the distribution of the electric fields E1 and E2 and the magnetic fields H1 and H2 of the first intersecting block is shown in FIGS. 3A and 3B. Formed together. In addition, when the TE mode of the second cross block 113 operates, the electric fields E1 and E2 and the magnetic fields H1 and H2 are distributed in the electric fields E1 and E2 and the magnetic fields H1 and H2 of the first intersecting block 111. It is formed the same as).

4 is a plan view of a high frequency filter according to a second embodiment of the present invention. 4, the high frequency filter according to the second embodiment of the present invention is almost the same as the high frequency filter according to the first embodiment of the present invention. Accordingly, in the high frequency filter according to the second embodiment of the present invention, the lower housing 400, the tuning adjustment screws 441, 442, 443, 444, the coupling cavity 421, and the coupling adjustment screws 423, 425, 427 are provided in the same manner as the first embodiment. ), Descriptions of the configuration of the input terminals 431 and 432 and the output terminals 433 and 434 are omitted.

Meanwhile, in the high frequency filter according to the second embodiment of the present invention, the first and second cross blocks 411 and 413 provided in the first and second cavities 402 and 403 are arranged differently from the high frequency filter according to the first embodiment. Specifically, the first intersection block 111 provided in the first cavity 102 of the high frequency filter according to the first embodiment has end portions of the first dielectric resonating elements 111a and 111b having inner sidewalls of the lower housing 101. Although it is provided so as to face the first intersection block 411 provided in the first cavity 402 of the high frequency filter according to the second embodiment, the ends of the first dielectric resonating elements 411a and 411b are formed in the lower housing 401. It is provided to face the edges between the inner sidewalls. Similarly, the second cross block 413 also has the same structure as the first cross block 411 and is arranged in the same form as the first cross block 411.

Further, according to the arrangement of the first and second cross blocks 411 and 413, the positions of the tuning adjustment screws 441, 442, 443 and 444 and the coupling adjustment screws 423, 425 and 427 are provided to facilitate the adjustment of the resonance frequency and the coupling of the high frequency filter. do.

Although the present invention has been described above by means of limited embodiments and drawings, the present invention is not limited thereto, and various modifications and changes may be made by those skilled in the art to which the present invention pertains.

1 is a perspective view of a high frequency filter according to a first embodiment of the present invention;

2A is a plan view of a high frequency filter according to a first embodiment of the present invention;

FIG. 2B is a front view of the high frequency filter taken along the line II ′ of FIG. 2A;

Figure 3a is a plan view of the electric field and magnetic field distribution of the first cross block provided in the high frequency filter according to the first embodiment of the present invention,

Figure 3b is a front view of the electric field and magnetic field distribution of the first cross block provided in the high frequency filter according to the first embodiment of the present invention,

4 is a plan view of a high frequency filter according to a second embodiment of the present invention;

Claims (11)

In the high frequency filter, At least two intersecting blocks, A lower housing having at least two cavities, each receiving the at least two intersecting blocks, the upper housing having an upper portion thereof, the lower housing including a partition wall separating the at least two cavities from each other; An upper cover coupled to an upper portion of an open lower housing to close the at least two cavities; An input and an output connector coupled to the lower housing and connected to the at least two cavities respectively; A coupling part for coupling an electric field and a magnetic field between the two intersecting blocks; At least one end portion protrudes through the cavity through the upper cover, and a high frequency filter, characterized in that it comprises a tuning adjustment screw for adjusting the length protruding into the cavity when rotating. The method of claim 1, wherein the intersection block, A high frequency filter comprising first and second dielectric elements coupled in a cross shape. The method of claim 1, The crossover block is fired by alumina ceramic and bonded to the lower housing. The method of claim 1, wherein the coupling unit, At least a portion of the partition wall is cut to connect the at least two cavities with each other; At least one end is received in the cavity through the upper cover, and the length of the cavity accommodated in the cavity is adjusted to adjust the coupling value of the electric and magnetic fields generated in the at least two cavities. High frequency filter comprising a. 3. The high frequency filter as claimed in claim 2, wherein the tuning adjustment screw is provided such that the protruding portion thereof is opposed to one end of each of the first and second dielectric elements of the cross block. The high frequency filter as claimed in claim 1, wherein the tuning adjustment screws are provided in the two cavities, respectively. 2. The high frequency filter of claim 1, wherein corners of upper and lower ends of the cross block are rounded. The cavity of claim 1, wherein the cavity is formed in a hexahedron shape by a lower surface inside the lower housing, an inner sidewall surface of the lower housing, and an inner upper surface of the upper cover. And the side ends of the cross block are coupled to face the inner side wall surface of the lower housing, respectively. The cavity of claim 1, wherein the cavity is formed in a hexahedron shape by a lower surface inside the lower housing, an inner sidewall surface of the lower housing, and an inner upper surface of the upper cover. And the side ends of the cross blocks are joined so as to face edge portions formed by inner side wall surfaces of the lower housing, respectively. 2. The high frequency filter of claim 1, wherein the input and output connectors are coupled in the same direction. The method according to any one of claims 1 to 10, A high frequency filter comprising filtering an RF signal by using a resonance frequency generated by an electric field and a magnetic field of a TE (Transverse Electric) mode.

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