CN110112521A - A kind of small-sized four die cavitys body double-frequency broadband filter - Google Patents
A kind of small-sized four die cavitys body double-frequency broadband filter Download PDFInfo
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- CN110112521A CN110112521A CN201910433262.XA CN201910433262A CN110112521A CN 110112521 A CN110112521 A CN 110112521A CN 201910433262 A CN201910433262 A CN 201910433262A CN 110112521 A CN110112521 A CN 110112521A
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- 230000005540 biological transmission Effects 0.000 claims abstract description 10
- 230000008878 coupling Effects 0.000 claims description 8
- 238000010168 coupling process Methods 0.000 claims description 8
- 238000005859 coupling reaction Methods 0.000 claims description 8
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- 238000004891 communication Methods 0.000 abstract description 11
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- 238000010295 mobile communication Methods 0.000 abstract description 5
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- 230000011664 signaling Effects 0.000 description 2
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
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Classifications
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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
- H01P1/207—Hollow waveguide filters
Abstract
The invention discloses a kind of small-sized four die cavitys body double-frequency broadband filters, it include: cylindrical metal cavity, SMA radio frequency connects input port, SMA radio frequency connects output port, inverted L shape incoming feeder, inverted L shape output feeder, the first solid inner conductor and the second solid inner conductor, entire filter construction are the symmetrical structure about plane of symmetry A-A '.The present invention realizes the double-frequency broadband characteristic of small size and high power capacity, passband both sides have transmission zero to bring higher passband selectivity, furthermore, also there are low dispersion, design and the characteristics such as the processing is simple, the design requirement that can satisfy small sized double frequency wide-band communication system can be applied in the microwave electrons system such as mobile communication, radar, satellite.
Description
Technical field
The present invention relates to a kind of cavity body filters, more particularly to a kind of small-sized four die cavitys body double-frequency broadband filter.
Background technique
With the fast development of wireless communication, frequency spectrum resource seems growing tension.In order to reduce communications cost and improve frequency
Utilization rate is composed, double frequency filter is as most common multiband filter, before the double-frequency communication system of different systems can be compatible with because of it
The Primary Component at end and become research hotspot.Cavity double frequency filter is due to filter with low insertion loss, high q-factor (quality factor), Gao Gong
The advantages such as rate capacity and high stability, are applied widely in highly selective narrow band communication, are especially filtered with cavity
Radio-frequency filter based on device be still key equipment in mobile communication base station, satellite communication system and military communication system it
One.
However, wireless Multi-Frequency Signaling System mentions cavity body filter as wireless communication is to miniaturization and widebandization development
Higher requirement is gone out.Firstly, the size of cavity body filter affects whole system size, integrates and encapsulate and be produced into
This, miniaturization is development trend；At the same time, the trend of high speed data transfers makes the bandwidth of frequency spectrums of operation more and more wider,
It is nervous to alleviate microwave spectrum resource, wirelessly communicate positive millimeter wave and Terahertz frequency range development.Small-sized cavity broadband multi-frequency filter
Wave device is the Primary Component being badly in need of in the Multi-Frequency Signaling System of the broadbands such as satellite, radar and mobile communication.
Broadband dual-frequency filter can only be realized by planar microstrip structure at present, and 2013, Wen Wu research team passed through
A kind of small-sized plane broadband dual-frequency filter (IEEE is proposed using the method that open circuit minor matters load short-circuit step impedance resonator
Transaction on MTT).Its frequency response figure is as shown in Figure 1, the FBW of two passband is respectively 48.5% and 54.2%.This
The broadband dual-frequency filter of kind method design not only has good pass-band performance and frequency selectivity, but also size is smaller.
Due to the high q-factor characteristic of cavity, the research of cavity double-frequency broadband filter is wide for cavity double frequency also in blank
For band filter design, difficult point is how to make each pass band width of cavity double frequency filter to increase, or from another angle,
Cavity single-frequency broadband filter how is set to be further added by a wideband passband.
Summary of the invention
The technical problem to be solved in the present invention is that in view of the above drawbacks of the prior art, providing a kind of compact-sized, body
Small, the at low cost, high q-factor of product, high power capacity and the small-sized four die cavitys body double-frequency broadband filter for being able to achieve cavity double-frequency broadband.
The technical solution used to solve the technical problems of the present invention is that constructing a kind of small-sized four die cavitys body double-frequency broadband filtering
Device, comprising: cylindrical metal cavity, SMA radio frequency connect input port, and SMA radio frequency connects output port, inverted L shape input
Feeder line, inverted L shape output feeder, the first solid inner conductor and the second solid inner conductor；The small-sized four die cavitys body double frequency is wide
Band filter is symmetrical about plane of symmetry A-A '；
The inverted L shape incoming feeder connect the signal wire connection of input port with the SMA radio frequency；It is described inverted
L shape output feeder connect the signal wire connection of output port with the SMA radio frequency, SMA radio frequency connection input port and defeated
On the orthogonal outer wall for being fixed on the cylindrical metal cavity of exit port；The first solid inner conductor and the second solid inner conductor
For etc. height equal diameter and height vertically connect the lower circular bottom surface of the cylindrical metal cavity, institute much larger than the cylindrical body of diameter
The height for stating the first solid inner conductor and the second solid inner conductor determines TM01Mould and TM11The resonance frequency of mould, TM01Mould and
TM11Mould is for realizing low frequency pass band；The diameter of the cylindrical metal cavity influences the resonance frequency of TE+ mould and TE- mould, TE+
For realizing high frequency pass band, the cylindrical metal housing depth is higher than the described first solid inner conductor and described for mould and TE- mould
The height of second solid inner conductor.
In small-sized four die cavitys body double-frequency broadband filter of the present invention, the inverted L shape incoming feeder and fall
The inversion minor matters for the L shape output feeder set are placed between the first solid inner conductor and the second solid inner conductor, the inversion branch
The separation of the effect length TE+ mould and TE- mould of section, to control the K value of high frequency pass band, the inversion minor matters and described first are in fact
Gap between intracardiac conductor and the second solid inner conductor influences the Q value of TE+ mould and TE- mould；The inverted L shape input
The height of feeder line and the inverted L shape output feeder influences TM01Mould and TM11The Q value of mould；The inverted L shape incoming feeder
There are source loads to couple between the inverted L shape output feeder, and coupling amount is determined by the gap between the inversion minor matters,
The coupling generates and controls transmission zero.
In small-sized four die cavitys body double-frequency broadband filter of the present invention, the first solid inner conductor and second is in fact
Gap between intracardiac conductor controls TM01Mould and TM11The separation of mould, to control the K value of low frequency pass band.
In small-sized four die cavitys body double-frequency broadband filter of the present invention, the inverted L shape incoming feeder and institute
The signal wire for stating SMA radio frequency connection input port passes through welded connecting；The inverted L shape output feeder and the SMA radio frequency
The signal wire of connection output port passes through welded connecting.
In small-sized four die cavitys body double-frequency broadband filter of the present invention, SMA radio frequency connection input port and
On the orthogonal outer wall for being fixed on the cylindrical metal cavity of four screws that output port passes through periphery.
In small-sized four die cavitys body double-frequency broadband filter of the present invention, the first solid inner conductor and second is in fact
Intracardiac conductor vertically connects the lower circular bottom surface of the cylindrical metal cavity by welding.
Implement in small-sized four die cavitys body double-frequency broadband filter of the invention, realizes pair of small size and high power capacity
Frequency broadband character, passband both sides have transmission zero to bring higher passband selectivity, in addition, also have low dispersion, design and
The characteristics such as the processing is simple can satisfy the design requirement of small sized double frequency wide-band communication system, can be applied to mobile communication, radar,
In the microwave electrons system such as satellite.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
Fig. 1 is the Minitype flat that the method in the prior art for loading short-circuit step impedance resonator using open circuit minor matters is realized
The frequency response chart of face broadband dual-frequency filter；
Fig. 2 is according to small-sized four die cavitys body double-frequency broadband filter construction 3D view proposed by the present invention；
Fig. 3 is according to small-sized four die cavitys body double-frequency broadband filter construction top view proposed by the present invention；
Fig. 4 is according to small-sized four die cavitys body double-frequency broadband filter construction side view proposed by the present invention；
Fig. 5 a is TM01Mould magnetic chart；
Fig. 5 b is TM11Mould magnetic chart；
Fig. 5 c is TE- mould electric field intensity map；
Fig. 5 d is TE+ mould electric field intensity map；
Fig. 6 is to change with solid inner conductor height h1, the insertion loss variation diagram of filter proposed by the present invention；
Fig. 7 is with feed height h2 variation, the transmission response variation diagram of filter proposed by the present invention；
Fig. 8 is to change with L shape feeder line and circle center distance L1, the transmission response variation diagram of filter proposed by the present invention；
Fig. 9 is the transmission response simulation result diagram according to filter proposed by the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The present invention is further explained in the light of specific embodiments, it should be understood that specific implementation described herein
Example does not have to be defined in the present invention only to explain the present invention.
To realize cavity double-frequency broadband filter, the present invention proposes one kind in cylinder by using four mould harmonic technologies
Four die cavity body double-frequency broadband filters, tool are realized using inversed l-shaped feeder line and double solid inner conductor loads in shape wire chamber
Body design principle is as follows:
1, four mould realization principle.
Four die cavitys body double-frequency broadband filter graph architecture proposed by the present invention is as in Figure 2-4.Fig. 5 is three resonant modes
The magnetic distribution figure of formula, it is the TM respectively indicated in wire chamber that wherein Fig. 5 a, which is, Fig. 5 b is, 5c is with Fig. 5 d01Mould magnetic chart,
TM11Mould magnetic chart, TE- mould electric field intensity map and TE+ mould electric field intensity map, A-A ' indicate the plane of symmetry, wherein TM01Mould and TM11Mould is wire chamber
In two modes being motivated by two solid inner conductor height h1 and its interval, TE+ mould and TE- mould are determined by cavity radius
Determine a pair of of degenerate mode of resonance frequency.As shown in fig. 6, with the increase of solid inner conductor height h1, by TM01Mould and TM11Mould structure
At the first band connection frequency it is mobile to low frequency, and the second passband is almost unchanged.This is controlled by the length of L shape feeder line at the same time
Degenerate mode is separated, this External Q to the separation of TE degenerate mode and four modes is controlled by the height of L shape feeder line
It can be influenced by feed height h2, variation diagram is as shown in fig. 7, feed height h2 to the external Q of four modes in two passbands
Value all has an impact.Finally, L shape feeder line and circle center distance L1 are then affected to the Q value of TE degenerate mode, and to two TM modes
Q value influence it is smaller, variation diagram as shown in figure 8, with L1 variation, the first passband be basically unchanged in band, and the second passband
Band in change greatly.
2, double-frequency broadband realization principle
TM01Mould and TM11Mould determines for realizing low frequency pass band, low frequency pass band centre frequency by the length of solid inner conductor,
And coefficient of coup K value is determined by the interval of two solid inner conductors.Then for realizing high frequency pass band, high frequency is logical for TE+ mould and TE- mould
Mid-band frequency is determined by cavity radius, and K value is determined by the length of L shape feeder line, and the bandwidth of two passbands is all to pass through increase
The K value of passband is realized.Transmission zero between low frequency pass band and high frequency pass band loads coupling by source and generates.
It is an object of the invention to overcome the deficiencies in the prior art, and it is tight to propose a kind of structure using four mould harmonic technologies
It gathers, is small in size, is at low cost, high q-factor, the intracavitary of high power capacity uses inversed l-shaped feeder line and double solid inner conductor loads real
Existing four die cavity body double-frequency broadband filters.The filter can satisfy small-sized, high power capacity, double-frequency broadband and highly selective
Design requirement, can be applied in the microwave electrons system such as the base station in mobile communication, radar, remote sensing.To achieve the above object,
Technical solution provided by the present invention are as follows: cylindrical metal is intracavitary to use inversed l-shaped feeder line and double solid inner conductor loads real
Existing four die cavity body double-frequency broadband filters.
The description present invention for clarity, Fig. 2-4 is 3-D view of the invention, top view and side view, Yi Zhong little respectively
Four die cavity body double-frequency broadband filter of type, comprising: cylindrical metal cavity 1, SMA radio frequency connect input port 2, and SMA radio frequency connects
Output port 3 is connect, inverted L shape incoming feeder 4, inverted L shape output feeder 5, the first solid inner conductor 6, second is solid interior
Conductor 7.
The cavity 1 is a hollow cylinder cavity, and housing depth is greater than the height of solid inner conductor 6 and 7, cavity diameter
Determine the resonance frequency of a pair of TE degenerate mode (TE+ mould and TE- mould), the SMA radio frequency connection input port 2 and output port 3
It is fixed on the chamber outer wall of certain altitude by the way that 4 screws on periphery are orthogonal, height control TM01Mould and TM11The Q value of mould；
The first solid inner conductor 6 and the second solid inner conductor 7 are solid cylinder, and bottom is fixed by welding in cavity round bottom
The height at face center, solid inner conductor 2 determines TM01Mould and TM11Resonance frequency.
Further, the front end of the inverted L shape incoming feeder 4 and inverted L shape output feeder 5 is to be inverted minor matters,
It is inverted minor matters to be placed between the first solid inner conductor 6 and the second solid inner conductor 7, is inverted minor matters effect length TE+ mould and TE-
The separation of mould, to control the K value of high frequency pass band, the gap being inverted between minor matters and solid inner conductor influences TE+ mould and TE- mould
Q value.There are source loads to couple between the inverted L shape incoming feeder 4 and inverted L shape output feeder 5, and coupling amount is by it
The gap being inverted between minor matters determines that the coupling generates and controls transmission zero.
Further, the gap between the described first solid inner conductor 6 and the second solid inner conductor 7 controls TM01Mould and
TM11The separation of mould, to control the K value of low frequency pass band.
The cylindrical cavity for the filter realized according to above embodiment is having a size of a height of 24mm, diameter 28mm, and two
The solid inner conductor height of root is all 18.2mm.The filter is made of metal, and is made in this embodiment of metallic aluminium, and
Surface layer is silver-plated, to reduce loss.The simulation result of small-sized four die cavitys body double-frequency broadband filter is as shown in Figure 9.The filter
Low frequency pass band centre frequency is 2.4GHz, and pass band width is 500MHz (FBW 20.8%), and high frequency pass band centre frequency is
4GHz, pass band width are 1500MHz (FBW 37.5%).The position of 3 transmission zeros is respectively 1.9GHz, 3GHz,
7.8GHz。
Four die cavity body double-frequency broadband filters of the embodiment of the present invention, there are two wider wideband pass-band performances, higher for tool
Passband selectivity and lesser size, can satisfy the design requirement of small sized double frequency wide-band communication system, can be applied to move
In the microwave electrons systems such as dynamic communication, radar, remote sensing, it is worthy to be popularized.The present invention includes being not limited in the above-mentioned implementation provided
Scheme, those skilled in the art are under design of the invention, without departing from the principle of the present invention, can make different changes
Shape and replacement, such as change the coupling position of feeder line, circular cylindrical cavity is changed to other shapes, is processed using other metals
Or plating, these deformations and replacement also belong to the scope of this patent.
Although the present invention be illustrated by specific embodiment, it will be appreciated by those skilled in the art that, do not departing from
In the case where the scope of the invention, various transformation and equivalent substitute can also be carried out to the present invention.In addition, being directed to particular condition or material
Material, can do various modifications to the present invention, without departing from the scope of the present invention.Therefore, the present invention is not limited to disclosed tool
Body embodiment, and should include the whole embodiments fallen within the scope of the appended claims.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (6)
1. a kind of small-sized four die cavitys body double-frequency broadband filter characterized by comprising cylindrical metal cavity, SMA radio frequency connect
Input port is connect, SMA radio frequency connects output port, and inverted L shape incoming feeder, inverted L shape output feeder, first is solid interior
Conductor and the second solid inner conductor；The small-sized four die cavitys body double-frequency broadband filter is symmetrical about plane of symmetry A-A '；
The inverted L shape incoming feeder connect the signal wire connection of input port with the SMA radio frequency；The inverted L shape
Output feeder connect the signal wire connection of output port, the SMA radio frequency connection input port and output end with the SMA radio frequency
On the orthogonal outer wall for being fixed on the cylindrical metal cavity of mouth；The first solid inner conductor and the second solid inner conductor are etc.
Height equal diameter and height vertically connect the lower circular bottom surface of the cylindrical metal cavity much larger than the cylindrical body of diameter, and described the
The height of one solid inner conductor and the second solid inner conductor determines TM01Mould and TM11The resonance frequency of mould, TM01Mould and TM11
Mould is for realizing low frequency pass band；The diameter of the cylindrical metal cavity influences the resonance frequency of TE+ mould and TE- mould, TE+ mould and
TE- mould is higher than the described first solid inner conductor and described second for realizing high frequency pass band, the cylindrical metal housing depth
The height of solid inner conductor.
2. small-sized four die cavitys body double-frequency broadband filter according to claim 1, which is characterized in that the inverted L shape
The inversion minor matters of incoming feeder and inverted L shape output feeder be placed in the first solid inner conductor and the second solid inner conductor it
Between, the separation of the effect length TE+ mould and TE- mould for being inverted minor matters, so that the K value of high frequency pass band is controlled, the inversion branch
Section and the gap between the first solid inner conductor and the second solid inner conductor mainly influence the Q of TE+ mould and TE- mould
Value；The height of the inverted L shape incoming feeder and the inverted L shape output feeder influences TM01Mould and TM11The Q value of mould；
Between the inverted L shape incoming feeder and the inverted L shape output feeder there are source load couple, coupling amount by it is described fall
The gap set between minor matters determines that the coupling generates and controls transmission zero.
3. small-sized four die cavitys body double-frequency broadband filter according to claim 2, which is characterized in that described first is solid interior
Gap between conductor and the second solid inner conductor controls TM01Mould and TM11The separation of mould, to control the K value of low frequency pass band.
4. small-sized four die cavitys body double-frequency broadband filter according to claim 3, which is characterized in that the inverted L shape
Incoming feeder passes through welded connecting with the signal wire that the SMA radio frequency connect input port；The inverted L shape output feeder with
The signal wire of the SMA radio frequency connection output port passes through welded connecting.
5. small-sized four die cavitys body double-frequency broadband filter according to claim 3, which is characterized in that the SMA radio frequency connects
It connects on the orthogonal outer wall for being fixed on the cylindrical metal cavity of four screws that input port and output port pass through periphery.
6. small-sized four die cavitys body double-frequency broadband filter according to claim 3, which is characterized in that described first is solid interior
Conductor and the second solid inner conductor vertically connect the lower circular bottom surface of the cylindrical metal cavity by welding.
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| CN201910433262.XA CN110112521B (en) | 2019-05-23 | 2019-05-23 | Small four-die cavity dual-band broadband filter |
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| CN110112521B CN110112521B (en) | 2023-11-21 |
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