KR101284992B1 - Waveguide Filter for using cavity - Google Patents

Abstract

A waveguide filter using a cavity is disclosed. A waveguide filter using a cavity includes a first input / output unit for receiving an external signal, a cavity for positioning the first input / output unit to one side, and filtering an external signal by mode combining, and a first input / output unit at the other side of the cavity. It includes a second input and output unit for maintaining a predetermined angle, not a straight line and outputs the filtered external signal.

Cavity, waveguide, input and output location

Description

Waveguide Filter Using Cavity {Waveguide Filter for using cavity}

Embodiments of the present invention relate to a waveguide filter using a cavity. More specifically, the waveguide input and output unit may be positioned at an arbitrary point, and thus, an additional element is not required when connecting to an external module, thereby reducing manufacturing cost and ultra high frequency. A waveguide filter using a cavity having excellent filter performance in a band.

The present invention is derived from the research conducted as part of the IT source technology development project of the Ministry of Knowledge Economy and the Ministry of Information and Communication Research and Development. [Task management number: 2008-F-013-02, Task name: Spectrum engineering and millimeter wave propagation resource use] Technology development].

When a very high frequency transmission / reception system requires very good performance, a waveguide filter composed of waveguide transmission lines may be used to eliminate unwanted signals generated from a transceiver or input from an external source. Here, the waveguide transmission line is capable of high power transmission and excellent in reliability compared to the microstrip transmission line or the coaxial line.

Referring to FIG. 1, in the conventional waveguide filter 101, two input / output units 103 and 105 are generally formed in a straight line. When such a waveguide filter is connected to an antenna of a microwave transmitting / receiving system, the waveguide filter cannot be directly connected to an antenna of the transmitting / receiving system, and the waveguide includes additional elements, that is, an input / output unit 201, 203 as shown in FIG. A bend 201 may be used to connect to the antenna of the transmission and reception system. Therefore, by using additional elements in the connection of the waveguide filter and the external device, the manufacturing cost can be increased and signal loss can be generated.

Embodiments of the present invention, by placing the waveguide input and output unit at any point, no additional element is required when connecting to the external module, the manufacturing cost can be reduced, the waveguide filter using a cavity having excellent filter performance in the ultra-high frequency band To provide.

A waveguide filter using a cavity according to an embodiment of the present invention includes a cavity for filtering an external signal by combining a first input / output unit for receiving an external signal, the first input / output unit to one side, and mode combining; And a second input / output unit positioned at the other side of the cavity while maintaining a predetermined angle rather than being aligned with the first input / output unit and outputting the filtered external signal.

A waveguide filter using a cavity according to another embodiment of the present invention is located on one side of a plurality of stacked cavities, a cavity stacked at the top, a first input / output unit receiving external signals, and one side of a cavity stacked at the bottom of the cavity. The second input / output unit may include a second input / output unit which is positioned while maintaining a predetermined angle with respect to the first input / output unit and outputs the external signal filtered by mode combining by the plurality of cavities.

According to embodiments of the present invention, since the waveguide input / output unit is located at an arbitrary point, no additional device is required when connecting to an external module, thereby reducing manufacturing costs. In addition, since an additional device is not required when connecting to an external module, the loss caused when using the additional device is reduced, so that the filter performance is excellent in the ultra-high frequency band, and the volume of the additional device can be reduced.

Hereinafter, a waveguide filter using a cavity according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 is a perspective view illustrating a waveguide filter using a cavity according to an embodiment of the present invention. 4 is a cross-sectional view taken along the portion of a-a 'of FIG. 3.

3 and 4, the waveguide filter 301 using the cavity according to an embodiment of the present invention includes a cavity 303, a first input / output unit 305, a second input / output unit 307, and a first signal. The combiner 309 and the second signal combiner 311 are included.

The cavity 303 may comprise any medium, for example a dielectric medium. Here, the cavity 303 may be formed in at least one shape, such as polygon, circle, or oval.

The cavity 303 locates the first input / output unit 305 that receives an external signal to one side and filters the external signal by mode combining. Here, the cavity 303 may combine two or more modes to generate mode combining.

In this case, the mode of the cavity 303 may be determined by the width L, the length W, and the height H of the cavity 303. For example, when the width of the cavity 303 is 10 mm, the length is 7 mm, and the height is 2.85 mm, the cavity 303 combines the TE102 mode and the TE301 mode, as shown in FIG. 5, to generate mode coupling. Can be.

Referring to FIG. 5, the portion where the transfer characteristic S21 of the waveguide filter is suddenly increased means that a specific mode is generated inside the cavity 303. The TE102 mode occurs at 40 to 45 GHz and the TE301 at 45 to 50 GHz. You can see that the mode has occurred.

The first input / output unit 305 is located at one side of the cavity 303 and receives an external signal. In detail, the first input / output unit 305 may be positioned above the cavity 303 to receive an external signal.

 The second input / output unit 307 is located on the other side of the cavity 303 and maintains a predetermined angle θ, not in line with the first input / output unit 305, and is filtered by the mode combination generated inside the cavity 303. Output the external signal. For example, the second input / output unit 307 may be positioned at the side of the cavity 303 to output the filtered external signal.

Here, the first input / output unit 305 and the second input / output unit 307 may maintain a right angle, but are not limited thereto.

In addition, as illustrated in FIG. 6, the first input / output unit 305 and the second input / output unit 307 may include resonators 601 therein to improve signal blocking characteristics.

The first signal combiner 309 connects the cavity 303 and the first input / output unit 305, and may transmit an external signal received through the first input / output unit 305 to the cavity 303. .

The second signal combiner 311 is a portion connecting the cavity 303 and the second input / output unit 307 to transfer the external signal filtered by the cavity 303 to the second input / output unit 307.

Here, the first signal combiner 309 and the second signal combiner 311 may change the size d to adjust the amount of mode coupling generated inside the cavity 303. The amount of mode coupling according to the size change of the first signal combiner 309 and the second signal combiner 311 is shown in FIG. 7. In this case, the pass band may be determined by the mode coupling amount of the cavity 303. Here, the pass band is a band for passing the external signal, may be about 40 ~ 47GHz, the stop band is a band for attenuating the external signal, may be a band excluding the pass band.

The waveguide filter using the cavity according to an embodiment of the present invention is referred to as filtering the external signal input to the first input / output unit by the cavity and transferring the signal to the second input / output unit, but the present invention is not limited thereto, and the external signal input to the second input / output unit is not limited thereto. May be filtered by the cavity and transferred to the first input / output unit.

8 is a perspective view illustrating a waveguide filter using a cavity according to another embodiment of the present invention. FIG. 9 is a cross-sectional view taken along the portion of b-b 'of FIG. 8.

8 and 9, a basic structure of a waveguide filter 801 using a cavity according to another embodiment of the present invention is basically a waveguide filter using a cavity according to one embodiment described with reference to FIGS. 3 to 7. Since the structure is the same, the content is omitted.

However, the cavity 803 includes a plurality of stacked cavities 803_1 to 803_3. In this case, the cavity 303 may be a dielectric cavity, and may be configured using a part of the multilayer dielectric substrate 1101 such as low temperature co-fired ceramic (LTCC). At this time, the dielectric waveguide composed of the dielectric cavity is as shown in, for example, FIGS. 10 and 11. Here, the cavity 803 may include a ground via 1001 positioned to pass through the multilayer dielectric substrate outside the plurality of stacked dielectric cavities. In this case, the ground via 1001 may act as a reflector with respect to the input external signal, thereby preventing the external signal from leaking outside the cavity.

The first input / output unit 805 is located at one side of the cavity 803_3 stacked at the top, and receives an external signal, and may be configured as a metal waveguide.

The second input / output unit 807 is positioned at one side of the cavity 803_1 stacked at the lowermost end, maintaining a predetermined angle rather than being aligned with the first input / output unit 805, and filtering by mode combining by the plurality of cavities 803. Output the external signal. In this case, the second input / output unit 807 may be formed of a dielectric.

The first signal combiner 809 is a portion connecting the cavity 803 and the first input / output unit 805, and includes a plurality of signal combiners 809_1 to 809_3. The plurality of signal combiners 809_1 to 809_3 are positioned in the plurality of cavities 803_1 to 803_3, respectively, and are arranged at the bottom of the cavity 803_3 stacked with the external signals inputted through the first input / output unit 805 at the top. It may be transferred to the cavity 803_1 being stacked.

According to embodiments of the present invention, since the waveguide input / output unit is located at an arbitrary point, no additional device is required when connecting to an external module, thereby reducing manufacturing costs. In addition, since an additional device is not required when connecting to an external module, the loss caused when using the additional device is reduced, so that the filter performance is excellent in the ultra-high frequency band, and the volume of the additional device can be reduced.

Embodiments according to the present invention may be implemented in the form of program instructions that can be executed through various computer means and recorded in a computer-readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. The program instructions recorded on the medium may be those specially designed and constructed for the present invention or may be available to those skilled in the art of computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. The medium may be a transmission medium such as an optical or metal line, a wave guide, or the like, including a carrier wave for transmitting a signal designating a program command, a data structure, or the like. Examples of program instructions include not only machine code generated by the compiler, but also high-level language code that can be executed by a computer using an interpreter. The hardware device described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains various modifications and variations from such descriptions. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the equivalents of the claims, as well as the claims.

1 is a view showing the configuration of a conventional waveguide filter.

FIG. 2 illustrates a waveguide bend used when connecting the waveguide and the external device of FIG. 1.

3 is a perspective view illustrating a waveguide filter using a cavity according to an embodiment of the present invention.

4 is a cross-sectional view taken along the portion of a-a 'of FIG. 3.

5 is a diagram illustrating a transfer characteristic of a waveguide filter.

6 is a diagram illustrating a configuration of a waveguide filter including a resonator.

7 is a diagram illustrating the amount of mode coupling and the pass band according to the size of the signal coupling unit.

8 is a perspective view illustrating a waveguide filter using a cavity according to another embodiment of the present invention.

FIG. 9 is a cross-sectional view taken along the portion of b-b 'of FIG. 8.

10 is a plan view of a dielectric waveguide according to another embodiment of the present invention.

FIG. 11 is a cross-sectional view taken along the portion of c-c 'of FIG. 10.

<Explanation of symbols for the main parts of the drawings>

301: waveguide filter 303: cavity

305: first input / output unit 307: second input / output unit

309: First signal combiner 311: Second signal combiner

Claims (15)

A first input / output unit configured to receive an external signal; A cavity that positions the first input / output unit to one side and filters the external signal by mode combining; And A second input / output unit positioned at the other side of the cavity while maintaining a predetermined angle rather than being in line with the first input / output unit and outputting the filtered external signal; Including, The first input / output unit or the second input / output unit, A waveguide filter using a cavity, comprising a resonator. The method of claim 1, A first signal coupling unit connecting the cavity and the first input / output unit to transfer an external signal input from the first input / output unit to the cavity; And A second signal coupling unit connecting the cavity and the second input / output unit to transfer the external signal filtered by the cavity to the second input / output unit; Further comprising a waveguide filter using a cavity. The method of claim 1, The cavity is, A waveguide filter using a cavity that combines two or more modes to generate the mode combining. The method of claim 1, The cavity is, A waveguide filter with a cavity that combines a TE102 mode and a TE301 mode to generate the mode coupling. The method of claim 1, The cavity is, A waveguide filter using a cavity, which is formed in a shape of at least one of a polygon, a circle, or an oval. The method of claim 1, The cavity is, A waveguide filter using a cavity, comprising a dielectric medium. delete The method of claim 1, The constant angle is, Waveguide filter with right angle, cavity. A plurality of stacked cavities; A first input / output unit positioned at one side of the cavity stacked on the uppermost end and receiving an external signal; And A second input / output unit which is located at one side of the cavity stacked at the lowermost end, maintains a predetermined angle, not in line with the first input / output unit, and outputs the external signal filtered by mode combining by the plurality of cavities. Containing, waveguide filter using the cavity. 10. The method of claim 9, A plurality of signal coupling units connecting the plurality of cavities and the first input / output unit, respectively, and transfer external signals inputted through the first input / output unit from the cavity stacked at the uppermost end to the cavity stacked at the lowest end. Further comprising a waveguide filter using a cavity. 10. The method of claim 9, The plurality of cavities, A waveguide filter using a cavity that combines a TE102 mode and a TE301 mode to generate the mode coupling. 10. The method of claim 9, The first input / output unit or the second input / output unit, A waveguide filter using a cavity, comprising a resonator. 10. The method of claim 9, The first input and output unit and the second input and output unit, A waveguide filter using a cavity that maintains a right angle. 10. The method of claim 9, The stacked plurality of cavities, A waveguide filter using a cavity, which is constructed using a portion of a multilayer dielectric substrate. The method of claim 14, A ground via positioned around the stacked plurality of cavities so as to pass through the multilayer dielectric substrate Further comprising a waveguide filter using a cavity.

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