CN113540715A - High-frequency band-pass filter and high-frequency radio frequency device - Google Patents
High-frequency band-pass filter and high-frequency radio frequency device Download PDFInfo
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- CN113540715A CN113540715A CN202110780814.1A CN202110780814A CN113540715A CN 113540715 A CN113540715 A CN 113540715A CN 202110780814 A CN202110780814 A CN 202110780814A CN 113540715 A CN113540715 A CN 113540715A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
- H01P1/20309—Strip line filters with dielectric resonator
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Abstract
The invention relates to the technical field of filters, in particular to a high-frequency band-pass filter and a high-frequency radio-frequency device. The high-frequency band-pass filter includes: the two ends of the rectangular outer conductor are respectively provided with a signal input port and a signal output port, and a cavity is arranged in the rectangular outer conductor; the plurality of suspended support structures are arranged at the bottom of the accommodating cavity in parallel; the transmission lines are sequentially distributed between the signal input port and the signal output port along the axis direction; wherein, each two adjacent suspended support structures are respectively provided with a transmission line; the transmission line closest to the signal input port is electrically connected with the signal input port, and the transmission line closest to the signal output port is electrically connected with the signal output port. The transmission lines are suspended in the rectangular outer conductor to form a micro-coaxial transmission line structure, and a coupling line section structure is formed among the plurality of transmission lines, so that a high-frequency filtering function is provided. The invention has simple integral structure and can effectively reduce the size of the high-frequency band-pass filter.
Description
Technical Field
The invention relates to the technical field of filters, in particular to a high-frequency band-pass filter and a high-frequency radio-frequency device.
Background
Among the filters, the operating signal exceeding 3MHz is referred to as a high-frequency signal, and a filter for filtering the high-frequency signal is a high-frequency filter.
Most of the existing microstrip line filters are manufactured based on a process on a Printed Circuit Board (PCB), occupy a large area, and need to be attached to a chip in an integrated manner, which is relatively complex. In general, microstrip line filters cannot filter high frequency signals of 100 GHz.
Therefore, how to reduce the size of the high-frequency band-pass filter is a technical problem that needs to be solved at present.
Disclosure of Invention
An object of the present invention is to provide a high frequency band pass filter and a high frequency radio frequency device to reduce the size of the high frequency band pass filter.
The embodiment of the invention provides the following scheme:
in a first aspect, an embodiment of the present invention provides a high-frequency band-pass filter, including:
the two ends of the rectangular outer conductor are respectively provided with a signal input port and a signal output port, and a cavity is arranged in the rectangular outer conductor;
the plurality of suspended support structures are arranged at the bottom of the accommodating cavity in parallel;
the transmission lines are sequentially distributed between the signal input port and the signal output port along the axis direction; wherein, each two adjacent suspended support structures are respectively provided with a transmission line; the transmission line closest to the signal input port is electrically connected with the signal input port, and the transmission line closest to the signal output port is electrically connected with the signal output port.
In one possible embodiment, the signal input port includes:
the input coaxial interface is arranged at one end of the rectangular outer conductor and is communicated with the cavity;
the input inner conductor section is arranged in the input coaxial interface in an insulating mode and is electrically connected with the transmission line closest to the signal input port;
the signal output port includes:
the output coaxial interface is arranged at one end of the rectangular outer conductor and is communicated with the cavity;
and the output inner conductor section is arranged in the output coaxial interface in an insulating way and is electrically connected with the transmission line closest to the signal output port.
In one possible embodiment, the length of the transmission line is 1/4 times the wavelength of the transmitted signal.
In a possible embodiment, the plurality of suspended support structures are sequentially distributed between the signal input port and the signal output port at equal intervals along the axial direction.
In one possible embodiment, the suspended support structure includes: an insulating platform structure; the insulating platform structure is arranged between two protruding parts at the bottom of the containing cavity, or between the side wall of the containing cavity and one protruding part at the bottom of the containing cavity.
In a second aspect, an embodiment of the present invention provides a high-frequency radio frequency device, including a high-frequency radio frequency circuit, where the high-frequency radio frequency circuit includes a high-frequency band-pass filter;
the high frequency band pass filter includes:
the two ends of the rectangular outer conductor are respectively provided with a signal input port and a signal output port, and a cavity is arranged in the rectangular outer conductor;
the plurality of suspended support structures are arranged at the bottom of the accommodating cavity in parallel;
the transmission lines are sequentially distributed between the signal input port and the signal output port along the axis direction; wherein, each two adjacent suspended support structures are respectively provided with a transmission line; the transmission line closest to the signal input port is electrically connected with the signal input port, and the transmission line closest to the signal output port is electrically connected with the signal output port.
In one possible embodiment, the signal input port includes:
the input coaxial interface is arranged at one end of the rectangular outer conductor and is communicated with the cavity;
the input inner conductor section is arranged in the input coaxial interface in an insulating mode and is electrically connected with the transmission line closest to the signal input port;
the signal output port includes:
the output coaxial interface is arranged at one end of the rectangular outer conductor and is communicated with the cavity;
and the output inner conductor section is arranged in the output coaxial interface in an insulating way and is electrically connected with the transmission line closest to the signal output port.
In one possible embodiment, the length of the transmission line is 1/4 times the wavelength of the transmitted signal.
In a possible embodiment, the plurality of suspended support structures are sequentially distributed between the signal input port and the signal output port at equal intervals along the axial direction.
In one possible embodiment, the suspended support structure includes: an insulating platform structure; the insulating platform structure is arranged between two protruding parts at the bottom of the containing cavity, or between the side wall of the containing cavity and one protruding part at the bottom of the containing cavity.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the transmission lines are erected on the suspended support structure and suspended inside the rectangular outer conductor to form a micro-coaxial transmission line structure, and a coupling line section structure is formed among the plurality of transmission lines, so that a high-frequency filtering function is provided. The invention has simple integral structure and can effectively reduce the size of the high-frequency band-pass filter.
Drawings
In order to more clearly illustrate the embodiments of the present specification or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present specification, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flow chart of a high-frequency band-pass filter according to an embodiment of the present invention;
FIG. 2 is a schematic view of the internal structure of FIG. 1;
fig. 3 is a schematic diagram of a simulation result of S11 of a high-frequency band-pass filter according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a simulation result of S21 of a signal input port of a high-frequency band-pass filter according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a simulation result of S21 of a signal output port of a high-frequency band-pass filter according to an embodiment of the present invention.
Description of reference numerals: 100 is a high frequency band pass filter, 200 is a rectangular outer conductor, 210 is a signal input port, 220 is a signal output port, 300 is a suspended support structure 300, 310 is an insulating platform structure, 320 is a protrusion, and 400 is a transmission line.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art based on the embodiments of the present invention belong to the scope of protection of the embodiments of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a high-frequency band-pass filter according to an embodiment of the present invention, and fig. 2 is a schematic internal structural diagram of fig. 1, where the high-frequency band-pass filter 100 includes: a rectangular outer conductor 200, a number of suspended support structures 300, and a number of transmission lines 400.
Specifically, the total number of the suspended support structures 300 is not less than 2, and the total number of the transmission lines 400 is not less than 1.
The transmission line 400 and the rectangular outer conductor 200 may be made of copper.
The rectangular outer conductor 200 has a signal input port 210 and a signal output port 220 at its two ends, respectively, and a cavity is provided inside the rectangular outer conductor 200.
Specifically, the signal input port 210 may include: an input coaxial interface and an input inner conductor segment. The input coaxial interface is arranged at one end of the rectangular outer conductor 200 and is communicated with the cavity; the input inner conductor segment is disposed in the input coaxial interface, is insulated from the input coaxial interface, and is electrically connected to the transmission line 400 closest to the signal input port 210.
Specifically, the signal output port 220 may include: an output coaxial interface and an output inner conductor segment. The output coaxial interface is arranged at one end of the rectangular outer conductor 200 and communicated with the cavity; the output inner conductor segment is disposed in the output coaxial interface, is insulated from the output coaxial interface, and is electrically connected to the transmission line 400 closest to the signal output port 220.
All the suspended support structures 300 are arranged in parallel at the bottom of the cavity.
Specifically, a plurality of suspended support structures 300 may be sequentially and equidistantly distributed between the signal input port 210 and the signal output port 220 along the axial direction of the rectangular outer conductor 200.
The suspended support structure 300 may include: insulating mesa structure 310.
The insulating platform structure 310 has two suspension modes, one is disposed between two protrusions 320 at the bottom of the cavity, and the other is disposed between the sidewall of the cavity and one protrusion 320 at the bottom of the cavity.
In practical applications, the insulating platform structure 310 may be made of an insulating material with good ductility.
All the transmission lines 400 are sequentially distributed between the signal input port 210 and the signal output port 220 along the axial direction of the rectangular outer conductor 200; wherein, each two adjacent suspended supporting structures 300 are provided with a transmission line 400; the transmission line 400 closest to the signal input port 210 is electrically connected to the signal input port 210, and the transmission line 400 closest to the signal output port 220 is electrically connected to the signal output port 220.
In particular, the length of the transmission line 400 may be 1/4 times the wavelength of the transmission signal, resulting in better filtering performance.
In this embodiment, the transmission line 400 is used for transmitting signals, and the transmission line 400 is suspended inside the rectangular outer conductor 200 under the suspension support structure 300, so as to avoid short circuit between the transmission line 400 and the rectangular outer conductor 200, thereby forming a micro-coaxial transmission line structure. In the micro-coaxial transmission line structure, the rectangular outer conductor 200 is a ground wire, a coupling line section structure is formed among the plurality of transmission lines 400, each coupling line section is a half-wavelength resonator, and the coupling connection is realized through the coupling line sections, so that the function of high-frequency filtering is provided. The present embodiment has a simple overall structure, and can effectively reduce the size of the high-frequency band-pass filter 100.
The band-pass frequency of the present embodiment is related to the length, width and coupling distance of the transmission line 400, and the odd-even mode impedance is calculated in the calculation process, and then the high-frequency band-pass filter 100 structure with different band-pass frequencies can be obtained through software simulation.
Application case
In this embodiment, the structure is adopted, and a high-frequency band-pass filter 100 with an occupied area of 6mm × 3mm, a center frequency of 90GHz, and a bandwidth of 83GHz to 97GHz is designed.
In order to illustrate the excellent bandpass filtering performance of the present application, the present embodiment also performs simulation analysis on the High Frequency bandpass filter 100 by using HFSS (High Frequency Structure Simulator) software.
Fig. 3 is a schematic diagram of a simulation result of S11 of a high-frequency band-pass filter according to an embodiment of the present invention, which is used to show the reflection capability of the high-frequency band-pass filter for radio frequency signals of different frequencies.
Fig. 4 is a schematic diagram of a simulation result of S21 of a signal input port of the high-frequency band-pass filter according to the embodiment of the present invention, and it can be seen that the loss of the radio frequency signal from 83GHz to 97GHz is small, and the high-frequency band-pass filter has good band-pass filtering performance.
Fig. 5 is a schematic diagram of a simulation result of S21 of a signal output port of the high-frequency band-pass filter according to the embodiment of the present invention, and it can be seen that the loss of the radio frequency signal from 83GHz to 97GHz is small, and the high-frequency band-pass filter has good band-pass filtering performance.
Based on the same inventive concept as the method, the embodiment of the present invention further provides a high frequency rf device, where the high frequency rf device is provided with a high frequency rf circuit, the high frequency rf circuit includes any one of the high frequency band pass filters 100 described above, and the structure of the high frequency band pass filter 100 is not described herein again.
The technical scheme provided by the embodiment of the invention at least has the following technical effects or advantages:
the transmission lines in the embodiment of the invention are erected on the suspension support structure and suspended in the rectangular outer conductor to form a micro-coaxial transmission line structure, and a coupling line section structure is formed among a plurality of transmission lines, so that the function of high-frequency filtering is provided. The embodiment of the invention has simple integral structure and can effectively reduce the size of the high-frequency band-pass filter.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A high frequency band pass filter, comprising:
the two ends of the rectangular outer conductor are respectively provided with a signal input port and a signal output port, and a cavity is arranged in the rectangular outer conductor;
the plurality of suspended support structures are arranged at the bottom of the accommodating cavity in parallel;
the transmission lines are sequentially distributed between the signal input port and the signal output port along the axis direction; wherein, each two adjacent suspended support structures are respectively provided with a transmission line; the transmission line closest to the signal input port is electrically connected with the signal input port, and the transmission line closest to the signal output port is electrically connected with the signal output port.
2. The high frequency band pass filter according to claim 1, wherein the signal input port comprises:
the input coaxial interface is arranged at one end of the rectangular outer conductor and is communicated with the cavity;
the input inner conductor section is arranged in the input coaxial interface in an insulating mode and is electrically connected with the transmission line closest to the signal input port;
the signal output port includes:
the output coaxial interface is arranged at one end of the rectangular outer conductor and is communicated with the cavity;
and the output inner conductor section is arranged in the output coaxial interface in an insulating way and is electrically connected with the transmission line closest to the signal output port.
3. The high frequency bandpass filter according to claim 1, wherein the length of the transmission line is 1/4 of the transmission signal wavelength.
4. The high frequency bandpass filter according to claim 1, wherein the plurality of suspended support structures are sequentially distributed between the signal input port and the signal output port at equal intervals along the axial direction.
5. The high frequency bandpass filter according to claim 4, wherein the suspended support structure comprises: an insulating platform structure; the insulating platform structure is arranged between two protruding parts at the bottom of the containing cavity, or between the side wall of the containing cavity and one protruding part at the bottom of the containing cavity.
6. A high-frequency radio frequency device comprises a high-frequency radio frequency circuit, and is characterized in that the high-frequency radio frequency circuit comprises a high-frequency band-pass filter;
the high frequency band pass filter includes:
the two ends of the rectangular outer conductor are respectively provided with a signal input port and a signal output port, and a cavity is arranged in the rectangular outer conductor;
the plurality of suspended support structures are arranged at the bottom of the accommodating cavity in parallel;
the transmission lines are sequentially distributed between the signal input port and the signal output port along the axis direction; wherein, each two adjacent suspended support structures are respectively provided with a transmission line; the transmission line closest to the signal input port is electrically connected with the signal input port, and the transmission line closest to the signal output port is electrically connected with the signal output port.
7. The high frequency radio frequency device according to claim 6, wherein the signal input port comprises:
the input coaxial interface is arranged at one end of the rectangular outer conductor and is communicated with the cavity;
the input inner conductor section is arranged in the input coaxial interface in an insulating mode and is electrically connected with the transmission line closest to the signal input port;
the signal output port includes:
the output coaxial interface is arranged at one end of the rectangular outer conductor and is communicated with the cavity;
and the output inner conductor section is arranged in the output coaxial interface in an insulating way and is electrically connected with the transmission line closest to the signal output port.
8. The high frequency radio frequency device according to claim 6, wherein the length of said transmission line is 1/4 of the transmission signal wavelength.
9. The high frequency radio frequency device according to claim 6, wherein the plurality of suspended support structures are sequentially distributed between the signal input port and the signal output port at equal intervals along an axial direction.
10. The high frequency radio frequency device according to claim 9, wherein the suspended support structure comprises: an insulating platform structure; the insulating platform structure is arranged between two protruding parts at the bottom of the containing cavity, or between the side wall of the containing cavity and one protruding part at the bottom of the containing cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110780814.1A CN113540715A (en) | 2021-07-09 | 2021-07-09 | High-frequency band-pass filter and high-frequency radio frequency device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110780814.1A CN113540715A (en) | 2021-07-09 | 2021-07-09 | High-frequency band-pass filter and high-frequency radio frequency device |
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| CN113540715A true CN113540715A (en) | 2021-10-22 |
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| CN202110780814.1A Pending CN113540715A (en) | 2021-07-09 | 2021-07-09 | High-frequency band-pass filter and high-frequency radio frequency device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114188691A (en) * | 2021-11-30 | 2022-03-15 | 赛莱克斯微系统科技（北京）有限公司 | Manufacturing method of air core micro-coaxial transmission line and biosensor |
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| US20060192638A1 (en) * | 2005-02-25 | 2006-08-31 | Samsung Electronics Co., Ltd. | Minaturized parallel coupled line filter using lumped capacitors and grounding and fabrication method thereof |
| CN203013890U (en) * | 2012-11-29 | 2013-06-19 | 中国航空工业第六○七研究所 | An X-waveband compact band-pass filter used for the frequency source of an aircraft radar |
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2021
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| US20060192638A1 (en) * | 2005-02-25 | 2006-08-31 | Samsung Electronics Co., Ltd. | Minaturized parallel coupled line filter using lumped capacitors and grounding and fabrication method thereof |
| CN203013890U (en) * | 2012-11-29 | 2013-06-19 | 中国航空工业第六○七研究所 | An X-waveband compact band-pass filter used for the frequency source of an aircraft radar |
| CN212874711U (en) * | 2020-06-03 | 2021-04-02 | 武汉凡谷电子技术股份有限公司 | Suspension line interdigital filter |
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| CN114188691A (en) * | 2021-11-30 | 2022-03-15 | 赛莱克斯微系统科技（北京）有限公司 | Manufacturing method of air core micro-coaxial transmission line and biosensor |
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Application publication date: 20211022 |
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