CN113675563B - Filter and communication equipment - Google Patents
Filter and communication equipment Download PDFInfo
- Publication number
- CN113675563B CN113675563B CN202010409581.XA CN202010409581A CN113675563B CN 113675563 B CN113675563 B CN 113675563B CN 202010409581 A CN202010409581 A CN 202010409581A CN 113675563 B CN113675563 B CN 113675563B
- Authority
- CN
- China
- Prior art keywords
- cavity
- filter
- filtering
- filtering cavity
- branch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
-
- 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
- H01P1/209—Hollow waveguide filters comprising one or more branching arms or cavities wholly outside the main waveguide
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The application discloses wave filter and communication equipment, this wave filter includes: the filter comprises a shell and a filter branch; the shell is provided with a first direction and a second direction which are perpendicular to each other; the filtering branch is arranged on the shell and consists of ten filtering cavities which are coupled in sequence; the first filter cavity and the third filter cavity of the filter branch are coupled with each other in a perceptual cross manner to form a perceptual cross-coupling zero point of the filter branch, capacitive cross-coupling elements are respectively arranged between the third filter cavity and the fifth filter cavity of the filter branch, between the fifth filter cavity and the seventh filter cavity of the filter branch, and between the seventh filter cavity and the ninth filter cavity of the filter branch to form three capacitive cross-coupling zero points of the filter branch, wherein the bandwidth range of the filter branch is 3600 MHz-3800 MHz. Through the mode, cross-coupling zero points are respectively generated at the high end and the low end of the pass band, and the out-of-band rejection performance of the filter can be improved.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a filter and a communications device.
Background
In a mobile communication system, a desired signal is modulated to form a modulated signal, the modulated signal is carried on a high-frequency carrier signal, the modulated signal is transmitted to the air through a transmitting antenna, the signal in the air is received through a receiving antenna, and the signal received by the receiving antenna does not include the desired signal but also includes harmonics and noise signals of other frequencies. The signal received by the receiving antenna needs to be filtered by a filter to remove unnecessary harmonic and noise signals. Therefore, the designed filter must precisely control its upper and lower limit frequencies to maintain high isolation from the out-of-band signals.
The inventor of the application finds that the setting of the coupling zero point of the existing filter is not reasonable in long-term research and development work, so that the characteristics of out-of-band rejection and the like of the filter branch are poor, and the high isolation from out-of-band signals is difficult to achieve.
Disclosure of Invention
The present application provides a filter and a communication device to solve the above technical problems.
In order to solve the technical problem, the application adopts a technical scheme that: the filter comprises a shell and a filtering branch; the shell is provided with a first direction and a second direction which are perpendicular to each other; the filtering branch is arranged on the shell and consists of ten filtering cavities which are sequentially coupled;
the first filtering cavity and the third filtering cavity of the filtering branch are coupled in an inductive cross mode to form an inductive cross coupling zero point of the filtering branch, capacitive cross coupling elements are respectively arranged between the third filtering cavity and the fifth filtering cavity of the filtering branch, between the fifth filtering cavity and the seventh filtering cavity of the filtering branch and between the seventh filtering cavity and the ninth filtering cavity of the filtering branch to form three capacitive cross coupling zero points of the filtering branch, and the bandwidth range of the filtering branch is 3600 MHz-3800 MHz.
Further, ten filter cavities of the filter branch circuit are divided into two rows arranged along the first direction; the first filter cavity, the third filter cavity, the fifth filter cavity, the seventh filter cavity and the ninth filter cavity of the filter branch are in a row and are sequentially arranged along the second direction; the second filtering cavity, the fourth filtering cavity, the sixth filtering cavity, the eighth filtering cavity and the tenth filtering cavity of the filtering branch are in a row and are sequentially arranged along the second direction.
Further, a third filter cavity of the filter branch is respectively adjacent to the first filter cavity, the second filter cavity, the fourth filter cavity and the fifth filter cavity of the filter branch; and the seventh filtering cavity of the filtering branch is respectively adjacent to the fifth filtering cavity, the sixth filtering cavity, the eighth filtering cavity and the ninth filtering cavity of the filtering branch.
Further, the projection of the center of the second filter cavity of the filter branch in the second direction is further located between the projection of the center of the first filter cavity of the filter branch in the second direction and the projection of the center of the third filter cavity of the filter branch in the second direction; the projection of the center of the ninth filter cavity of the filter branch in the second direction is further located between the projection of the center of the eighth filter cavity of the filter branch in the second direction and the projection of the center of the tenth filter cavity of the filter branch in the second direction.
Further, the capacitive cross coupling element comprises a supporting clamping seat and a capacitive coupling probe, the supporting clamping seat is respectively arranged between the third filtering cavity and the fifth filtering cavity, between the fifth filtering cavity and the seventh filtering cavity, and between the seventh filtering cavity and the ninth filtering cavity, and the capacitive coupling probe is arranged on the supporting clamping seat; one end of a capacitive coupling probe arranged between the third filtering cavity and the fifth filtering cavity is welded with the cavity of the third filtering cavity, and the other end of the capacitive coupling probe is welded with the cavity of the fifth filtering cavity; one end of a capacitive coupling probe arranged between the fifth filtering cavity and the seventh filtering cavity is welded with the cavity of the fifth filtering cavity, and the other end of the capacitive coupling probe is welded with the cavity of the seventh filtering cavity; one end of a capacitive coupling probe arranged between the seventh filtering cavity and the ninth filtering cavity is welded with the cavity of the seventh filtering cavity, and the other end of the capacitive coupling probe is welded with the cavity of the ninth filtering cavity; the capacitive coupling probe comprises a metal sheet, and the material of the support clamping seat comprises PTFE or engineering plastics.
Furthermore, the second filtering cavity and the tenth filtering cavity are provided with a first mounting column, a metal resonance rod and a first tuning screw rod; the metal resonance rod comprises a first U-shaped side wall, a first hollow inner cavity is formed in the first U-shaped side wall, two ends of the first U-shaped side wall bend and extend in a direction departing from the first hollow inner cavity so as to form disc-shaped structures at two ends of the first U-shaped side wall, and the disc-shaped structures are arranged in parallel with the bottom of the first U-shaped side wall; one end of the first tuning screw is arranged in the first hollow inner cavity; wherein, first U type lateral wall is fixed on first erection column.
Furthermore, each of the first filtering cavity, the third filtering cavity and the ninth filtering cavity is provided with a medium resonance rod and a second tuning screw rod; the medium resonance rod comprises a tubular side wall, and a second hollow inner cavity is formed in the tubular side wall; one end of the second tuning screw is arranged in the second hollow inner cavity; wherein, both ends of the tubular side wall are welded to the cavity of the filter cavity where the tubular side wall is located.
Furthermore, the first filtering cavity to the tenth filtering cavity are sequentially coupled with pure window coupling between the two filtering cavities.
Furthermore, metal coupling ribs are arranged between the first filtering cavity and the second filtering cavity, between the second filtering cavity and the third filtering cavity, between the third filtering cavity and the fourth filtering cavity, between the fourth filtering cavity and the fifth filtering cavity, between the fifth filtering cavity and the sixth filtering cavity, between the sixth filtering cavity and the seventh filtering cavity, between the seventh filtering cavity and the eighth filtering cavity, between the eighth filtering cavity and the ninth filtering cavity, and between the ninth filtering cavity and the tenth filtering cavity.
In order to solve the above technical problem, the present application further provides a communication device, which includes an antenna and a radio frequency unit connected to the antenna; the radio frequency unit comprises the filter and is used for filtering the radio frequency signal.
The application has at least the following beneficial effects: and through the capacitive cross coupling between the third filter cavity of the filter branch and the fifth filter cavity of the filter branch, the capacitive cross coupling between the fifth filter cavity of the filter branch and the seventh filter cavity of the filter branch and the capacitive cross coupling between the seventh filter cavity of the filter branch and the ninth filter cavity of the filter branch, the capacitive cross coupling zero point is generated at the low end of the pass band. Therefore, cross-coupling zero points are respectively generated at the high end and the low end of the passband, and the out-of-band rejection performance of the filter can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present application 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 application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic diagram of an embodiment of a filter provided herein;
FIG. 2 is a schematic diagram of a topology of a filtering branch provided in the present application;
fig. 3 is a schematic diagram of a capacitive cross-coupling structure of a third filter cavity and a fifth filter cavity of a filter branch provided in the present application;
fig. 4 is a schematic diagram of a capacitive cross-coupling structure of a fifth filter cavity and a seventh filter cavity of the filter branch provided by the present application;
fig. 5 is a schematic diagram of a capacitive cross-coupling structure of a seventh filter cavity and a ninth filter cavity of the filter branch provided in the present application;
FIG. 6 is an enlarged schematic view of a metal coupling probe and a support cartridge provided herein;
FIG. 7 is a schematic structural diagram of a second filter cavity and a tenth filter cavity of the filter cavity provided herein;
fig. 8 is a schematic structural view of filter cavities of the first filter cavity, the third filter cavity, and the ninth filter cavity provided in the present application;
FIG. 9 is a schematic diagram of a three-dimensional structure of a filter provided herein;
FIG. 10 is a schematic diagram of a simulation of the filtering branch of the filter provided in the present application;
fig. 11 is a diagram illustrating an embodiment of a communication device according to the present application.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be noted that the following examples are only illustrative of the present application, and do not limit the scope of the present application. Likewise, the following examples are only some examples and not all examples of the present application, and all other examples obtained by a person of ordinary skill in the art without any inventive step are within the scope of the present application.
The terms "first," "second," "third," "fourth," and the like in the description and claims of this application and in the above-described drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Please refer to fig. 1, which is a schematic structural diagram of an embodiment of a filter provided in the present application.
As shown in fig. 1, the present embodiment provides a filter 10 including: a housing 110 and a filter branch 120. The housing 110 has a first direction W and a second direction L perpendicular to the first direction; and the filtering branch 120 is arranged on the shell 110 and consists of ten filtering cavities A1-A10 which are coupled in sequence.
The housing 110 may include a bottom wall, a side wall, and an upper wall to form a closed space. In the present embodiment, the casing 110 is merely illustrated for example, and the present invention is not limited thereto.
Referring to fig. 2, fig. 2 is a schematic diagram of a topology structure of a filtering branch circuit provided in the present application.
As shown in fig. 2, the first filter cavity A1 and the third filter cavity A3 of the filter branch 120 are inductively cross-coupled to form an inductive cross-coupling zero of the filter branch 120, which is equivalent to the inductor L1 shown in fig. 2; capacitive cross coupling elements are respectively arranged between the third filter cavity A3 and the fifth filter cavity A5 of the filter branch 120, between the fifth filter cavity A5 and the seventh filter cavity A7 of the filter branch 120, and between the seventh filter cavity A7 and the ninth filter cavity A9 of the filter branch 120, so as to form three capacitive cross coupling zeros of the filter branch 120, which are respectively equivalent to the capacitor C1, the capacitor C2, and the capacitor C3 shown in fig. 2, wherein the bandwidth range of the filter branch 120 is 3600MHz to 3800MHz.
The coupling zero point is also called a transmission zero point, so that zero point suppression can be realized, and the debugging of indexes is facilitated. The transmission zero can make the transmission function of the filter 10 equal to zero, that is, the electromagnetic energy at the frequency point corresponding to the transmission zero cannot pass through the network, so that the complete isolation effect is achieved, the suppression effect on the signals outside the pass band is achieved, and the high isolation between the pass band and the outside can be better achieved. Therefore, an inductive cross-coupling zero is generated at the high end of the pass band by the inductive cross-coupling between the first filter cavity A1 and the third filter cavity A3 of the filter branch 120, and three capacitive cross-coupling zeros are generated at the low end of the pass band by the capacitive cross-coupling between the third filter cavity A3 of the filter branch 120 and the fifth filter cavity A5 of the filter branch 120, the capacitive cross-coupling between the fifth filter cavity A5 of the filter branch 120 and the seventh filter cavity A7 of the filter branch 120, and the capacitive cross-coupling between the seventh filter cavity A7 of the filter branch 120 and the ninth filter cavity A9 of the filter branch 120. Therefore, coupling zero points are respectively generated at the high end and the low end of the pass band, so that the debugging indexes are convenient, the signals outside the pass band can be restrained, and the isolation degree between the signals inside the pass band and the signals outside the pass band of the filter 10 is improved.
Referring to fig. 1, in particular, ten filter cavities A1-a10 of the filter branch 120 are divided into two rows arranged along a first direction W; the first filtering cavity A1, the third filtering cavity A3, the fifth filtering cavity A5, the seventh filtering cavity A7 and the ninth filtering cavity A9 of the filtering branch 120 are in a row and are sequentially arranged along the second direction L; the second filtering cavity A2, the fourth filtering cavity A4, the sixth filtering cavity A6, the eighth filtering cavity A8 and the tenth filtering cavity a10 of the filtering branch 120 are in a row and are sequentially arranged along the second direction L.
By dividing the ten filter cavities A1-a10 of the filter branch 120 into two rows arranged along the first direction W, the arrangement structure of the filter cavities is relatively regular, which facilitates the design and manufacture of the filter 10 and reduces the volume of the filter 10 by the regular arrangement, compared to the irregular arrangement in the prior art.
The space utilization of the filter 10 may be improved by disposing one filter cavity adjacent to a plurality of filter cavities, for example, the third filter cavity A3 of the filter branch 120 is disposed adjacent to the first filter cavity A1, the second filter cavity A2, the fourth filter cavity A4, and the fifth filter cavity A5 of the filter branch 120, respectively; the seventh filtering cavity A7 of the filtering branch 120 is respectively adjacent to the fifth filtering cavity A5, the sixth filtering cavity A6, the eighth filtering cavity A8 and the ninth filtering cavity A9 of the filtering branch 120.
The space utilization of the filter 10 can be improved by reasonably setting the relative positions of the two rows of filter cavities, for example, the projection of the center of the second filter cavity A2 of the filter branch 120 in the second direction L is further located between the projection of the center of the first filter cavity A1 of the filter branch 120 in the second direction L and the projection of the center of the third filter cavity A3 of the filter branch 120 in the second direction L; the projection of the center of the ninth filter cavity A9 of the filter branch 120 in the second direction L is further located between the projection of the center of the eighth filter cavity A8 of the filter branch 120 in the second direction L and the projection of the center of the tenth filter cavity a10 of the filter branch 120 in the second direction L. In this way, the projection of the row of the second filter cavity A2 in the second direction L and the projection of the row of the ninth filter cavity A9 in the second direction L are highly overlapped, so that the space utilization rate of the filter 10 is improved, and the size of the filter 10 can be reduced.
Further, the space utilization of the filter 10 is further improved by specifically setting the arrangement form of the filter cavities, for example, the first filter cavity A1 to the fifth filter cavity A5 of the filter branch 120 may be sequentially arranged in an M shape; the fourth filter cavity A4 of the filter branch 120 to the eighth filter cavity A8 of the filter branch 120 may be sequentially arranged in an M-shape; the sixth through tenth filter cavities A6 through a10 of the filter branch 120 may be sequentially arranged in an M-shape. Therefore, the filter cavities are regularly arranged, and the filter cavities in the row where the second filter cavity A2 is located and the filter cavities in the row where the ninth filter cavity A9 is located are arranged in a staggered mode, so that the space utilization rate of the filter 10 is further improved.
Referring to fig. 3 to 5, fig. 3 is a schematic diagram illustrating a capacitive cross-coupling structure of a third filter cavity and a fifth filter cavity of a filter branch provided in the present application; fig. 4 is a schematic diagram of a capacitive cross-coupling structure of a fifth filter cavity and a seventh filter cavity of a filter branch provided in the present application; fig. 5 is a schematic diagram of a capacitive cross-coupling structure of a seventh filter cavity and a ninth filter cavity of the filter branch circuit provided in the present application.
As shown in fig. 3 to 5, further, the capacitive cross coupling element includes a supporting clamping seat 130 and a capacitive coupling probe 140, the supporting clamping seat 130 is respectively disposed between the third filtering cavity A3 and the fifth filtering cavity A5, between the fifth filtering cavity A5 and the seventh filtering cavity A7, and between the seventh filtering cavity A7 and the ninth filtering cavity A9, and the capacitive coupling probe 140 is disposed on the supporting clamping seat 130.
As shown in fig. 3, one end of the capacitive coupling probe 140 disposed between the third filter cavity A3 and the fifth filter cavity A5 is welded to the cavity of the third filter cavity A3, and the other end is welded to the cavity of the fifth filter cavity A5; as shown in fig. 4, one end of the capacitive coupling probe 140 disposed between the fifth filter cavity A5 and the seventh filter cavity A7 is welded to the cavity of the fifth filter cavity A5, and the other end is welded to the cavity of the seventh filter cavity A7; as shown in fig. 5, one end of the capacitive coupling probe 140 disposed between the seventh filter cavity A7 and the ninth filter cavity A9 is welded to the cavity of the seventh filter cavity A7, and the other end is welded to the cavity of the ninth filter cavity A9.
Referring to fig. 3-5 in combination, in particular, the capacitive coupling probe 140 includes a metal sheet, and the material of the support socket 130 includes PTFE or engineering plastic. Windows may be respectively disposed between the third filter cavity A3 and the fifth filter cavity A5, between the fifth filter cavity A5 and the seventh filter cavity A7, and between the seventh filter cavity A7 and the ninth filter cavity A9, and a support clamping seat 130 is disposed at the windows. The support socket 130 may have a second direction L and a third direction H perpendicular to each other, wherein the third direction H is also perpendicular to the first direction W.
Specifically, the cavity of each filter cavity may include a main body 100 and a cover 200. The main body 100 is provided with an open slot, the cover body 200 is covered on the main body 100 to close the open slot of the main body 100, and a filtering cavity is formed. The cover 200 may be formed of an upper wall of the case 110, and the bottom wall 101 of the main body 100 may be formed of a bottom wall of the case 110.
Referring to fig. 6, fig. 6 is an enlarged schematic view of a metal coupling probe and a supporting card seat provided in the present application.
As shown in fig. 6, the metal coupling probe 140 includes a first coupling portion 141, a connection portion 142, and a second coupling portion 143. One end of the first coupling part 141 may be connected to one end of the connection part 142, and the other end of the connection part 142 may be connected to one end of the second coupling part 143.
Referring to fig. 3 and 6, in the metal coupling probe 140 disposed between the third filter cavity A3 and the fifth filter cavity A5, the first coupling portion 141 extends into the third filter cavity A3 and couples with the third filter cavity A3, the second coupling portion 143 extends into the fifth filter cavity A5 and couples with the fifth filter cavity A5, and one end of the first coupling portion 141, which is far away from the connecting portion 142, is welded to the cavity of the third filter cavity A3, and one end of the second coupling portion 143, which is far away from the connecting portion 142, is welded to the cavity of the fifth filter cavity A5. This enables a double-ended short circuit of the metal coupling probe 140 disposed between the third filter cavity A3 and the fifth filter cavity A5.
In order to better secure the metal coupling probe 140 disposed between the third filter cavity A3 and the fifth filter cavity A5, the support clamp 130 disposed between the third filter cavity A3 and the fifth filter cavity A5 may include a first portion extending into the third filter cavity A3 along the second direction L and a second portion extending into the fifth filter cavity A5 along the second direction L. The metal coupling probe 140 may be disposed in the support socket 130, and the first coupling portion 141 is located at the first portion, and the second coupling portion 143 is located at the second portion. One end of the first coupling part 141 away from the connecting part 142 may extend from one end of the support socket 130 along the third direction H, so that one end of the first coupling part 141 away from the connecting part 142 is welded with the cavity of the third filter cavity A3; an end of the second coupling portion 143, which is far away from the connection portion 142, may extend from the other end of the support socket 130 in the third direction H, so that the end of the second coupling portion 143, which is far away from the connection portion 142, is welded with the cavity of the fifth filter cavity A5.
Specifically, an end of the first coupling part 141 remote from the connection part 142 may be welded to one of the bottom wall 101 of the third filter chamber A3 and the cover body 200, and an end of the second coupling part 143 remote from the connection part 142 may be welded to the other of the bottom wall 101 of the fifth filter chamber A5 and the cover body 200.
Referring to fig. 4 and 6, in the metal coupling probe 140 disposed between the fifth filtering cavity A5 and the seventh filtering cavity A7, the first coupling portion 141 extends into the fifth filtering cavity A5 to couple with the fifth filtering cavity A5, the second coupling portion 143 extends into the seventh filtering cavity A7 to couple with the seventh filtering cavity A7, one end of the first coupling portion 141, which is far away from the connecting portion 142, is welded to the cavity of the fifth filtering cavity A5, and one end of the second coupling portion 143, which is far away from the connecting portion 142, is welded to the cavity of the seventh filtering cavity A7. This enables a double-ended short circuit of the metal coupling probe 140 disposed between the fifth filter cavity A5 and the seventh filter cavity A7.
In order to better secure the metallic coupling probe 140 disposed between the fifth filter chamber A5 and the seventh filter chamber A7, the support chuck 130 disposed between the fifth filter chamber A5 and the seventh filter chamber A7 may include a first portion extending into the fifth filter chamber A5 along the second direction L and a second portion extending into the seventh filter chamber A7 along the second direction L. The metal coupling probe 140 may be disposed in the supporting socket 130, and the first coupling portion 141 is located at the first portion, and the second coupling portion 143 is located at the second portion. One end of the first coupling part 141 away from the connecting part 142 may extend from one end of the support holder 130 along the third direction H, so that one end of the first coupling part 141 away from the connecting part 142 is welded with the cavity of the fifth filter cavity A5; an end of the second coupling portion 143, which is away from the connection portion 142, may extend from the other end of the support socket 130 in the third direction H, so that the end of the second coupling portion 143, which is away from the connection portion 142, is welded with the cavity of the seventh filter cavity A7.
Specifically, an end of the first coupling part 141 away from the connection part 142 may be welded to one of the bottom wall 101 of the fifth filter chamber A5 and the cover body 200, and an end of the second coupling part 143 away from the connection part 142 may be welded to the other of the bottom wall 101 of the seventh filter chamber A7 and the cover body 200.
Referring to fig. 5 and 6, in the metal coupling probe 140 disposed between the seventh filtering cavity A7 and the ninth filtering cavity A9, the first coupling portion 141 extends into the seventh filtering cavity A7 to be coupled with the seventh filtering cavity A7, the second coupling portion 143 extends into the ninth filtering cavity A9 to be coupled with the ninth filtering cavity A9, one end of the first coupling portion 141, which is far away from the connecting portion 142, is welded to the cavity of the seventh filtering cavity A7, and one end of the second coupling portion 143, which is far away from the connecting portion 142, is welded to the cavity of the ninth filtering cavity A9. This enables a double-ended short circuit of the metal coupling probe 140 disposed between the seventh filter cavity A7 and the ninth filter cavity A9.
In order to better secure the metallic coupling probe 140 disposed between the seventh filter cavity A7 and the ninth filter cavity A9, the support chuck 130 disposed between the seventh filter cavity A7 and the ninth filter cavity A9 may include a first portion extending into the seventh filter cavity A7 along the second direction L and a second portion extending into the ninth filter cavity A9 along the second direction L. The metal coupling probe 140 may be disposed in the supporting socket 130, and the first coupling portion 141 is located at the first portion, and the second coupling portion 143 is located at the second portion. An end of the first coupling portion 141 away from the connecting portion 142 may extend from an end of the support socket 130 along the third direction H, so that the end of the first coupling portion 141 away from the connecting portion 142 is welded to the cavity of the seventh filter cavity A7; an end of the second coupling portion 143 away from the connection portion 142 may extend from the other end of the support holder 130 in the third direction H, so that the end of the second coupling portion 143 away from the connection portion 142 is welded to the cavity of the ninth filter cavity A9.
Specifically, an end of the first coupling part 141 away from the connection part 142 may be welded to one of the bottom wall 101 of the seventh filter cavity A7 and the cover body 200, and an end of the second coupling part 143 away from the connection part 142 may be welded to the other of the bottom wall 101 of the ninth filter cavity A9 and the cover body 200.
Referring to fig. 7, fig. 7 is a schematic structural diagram of filter cavities of the second filter cavity and the tenth filter cavity provided in the present application.
The second filtering cavity A2 and the tenth filtering cavity a10 are provided with a first mounting post 150, a metal resonance rod 160 and a first tuning screw 170; the metal resonance rod 160 comprises a first U-shaped side wall 161, the first U-shaped side wall 161 is formed with a first hollow inner cavity 162, two ends of the first U-shaped side wall 161 are bent and extended in a direction away from the first hollow inner cavity 162, so as to form disc-shaped structures 163 at two ends of the first U-shaped side wall 161, and the disc-shaped structures 163 are arranged in parallel with the bottom of the first U-shaped side wall 161; one end of the first tuning screw 170 is disposed within the first hollow interior 162; wherein the first U-shaped sidewall 161 is secured to the first mounting post 150.
The first mounting post may be provided to the bottom wall 101 of the second filter chamber A2 and the bottom wall 101 of the tenth filter chamber a 10. The cover body 200 of the second filter cavity A2 and the cover body 200 of the tenth filter cavity a10 may be provided with a first screw hole, and the first tuning screw 170 may penetrate through the first screw hole.
Specifically, the first tuning screw 170 may be a metal tuning screw. The metal resonant rod 160 may be made of invar steel.
Referring to fig. 8, fig. 8 is a schematic structural diagram of filter cavities from the first filter cavity, the third filter cavity to the ninth filter cavity provided in the present application.
As shown in fig. 8, each of the first filter chamber A1, the third filter chamber A3 to the ninth filter chamber A9 is provided with a dielectric resonance rod 180 and a second tuning screw 190; the dielectric resonant rod 180 may be a TM mode resonant rod. The dielectric resonance rod 180 may include a tubular sidewall 181, the tubular sidewall 181 being formed with a second hollow inner cavity 182; one end of the second tuning screw 190 is disposed within the second hollow interior 182; wherein, both ends of the tubular side wall 181 are welded to the cavity of the filter cavity where the tubular side wall 181 is located. Specifically, the tubular sidewall 181 may be disposed along the ground three directions H, one end of the tubular sidewall 181 is welded to the bottom wall 101 of the cavity in which the tubular sidewall 181 is located, and the other end of the tubular sidewall 181 is welded to the cover 200 of the cavity in which the tubular sidewall 181 is located. The double-end short-circuiting of the dielectric resonance rod 180 can be achieved by welding both ends of the tubular side wall 181 to the cavity of the filter chamber where the tubular side wall 181 is located.
With reference to fig. 8 and 7, in this embodiment, the structure of the ten filter cavities A1-a10 may be reasonably arranged, so that the resonant rods inside the second filter cavity A2 and the tenth filter cavity a10 are the metal resonant rods 160, and the resonant rods inside the first filter cavity A1, the third filter cavity A3 to the ninth filter cavity A9 are the dielectric resonant rods 180. Since the insertion loss of the dielectric resonant rod 180 is small, the energy consumption of the filter 10 can be reduced, and the first filter cavity A1, the third filter cavity A3 to the ninth filter cavity A9 can bear a larger resonant frequency. Secondly, the dielectric resonance rod 180 enables electromagnetic wave energy to be mainly concentrated around the dielectric resonance rod 180, and the design size of the filter cavity can be reduced, thereby enabling the size of the filter 10 to be reduced.
Referring to fig. 9, fig. 9 is a schematic diagram of a three-dimensional structure of the filter provided in the present application.
As shown in fig. 8, a window 300 is formed between two filter cavities coupled in sequence from the first filter cavity A1 to the tenth filter cavity a 10. The two filter cavities coupled in sequence from the first filter cavity A1 to the tenth filter cavity a10 may be coupled by a pure window. Thus, materials can be saved, and the production cost of the filter 10 can be reduced.
Metal coupling ribs (not shown) may also be disposed between two filter cavities sequentially coupled in the first filter cavity A1 to the tenth filter cavity a10, for example, between the first filter cavity A1 and the second filter cavity A2, between the second filter cavity A2 and the third filter cavity A3, between the third filter cavity A3 and the fourth filter cavity A4, between the fourth filter cavity A4 and the fifth filter cavity A5, between the fifth filter cavity A5 and the sixth filter cavity A6, between the sixth filter cavity A6 and the seventh filter cavity A7, between the seventh filter cavity A7 and the eighth filter cavity A8, between the eighth filter cavity A8 and the ninth filter cavity A9, and between the ninth filter cavity A9 and the tenth filter cavity a 10. Thus, the coupling strength of the two filter cavities coupled in sequence is enhanced by the metal coupling rib.
A window 300 may be provided between the first filter cavity A1 and the third filter cavity A3, and a metal coupling rib may be provided in the window 300, so as to realize inductive cross coupling between the first filter cavity A1 and the third filter cavity A3.
Referring to fig. 10, fig. 10 is a simulation diagram of a filtering branch of the filter provided in the present application.
See the band curve 20 of the filter branch 120 as shown in fig. 10. Where the point m1 is a lower cut-off frequency point and the point m2 is an upper cut-off frequency point. The frequency of the lower-limit cutoff frequency point m1 is 3600MHz, and the frequency of the upper-limit cutoff frequency point m2 is 3800MHz, that is, the bandwidth simulated by the filtering branch circuit 120 is within the range of 3600MHz to 3800MHz. The filter 10 provided by the present application can be applied to 5G communication devices.
Wherein, the average insertion loss of the filtering branch 120 is less than 1.5dB in the bandwidth range. In particular, the frequency difference from the lower cut-off frequency point m1 is within the bandwidth range of 40MHz, and the average insertion loss of the filtering branch 120 is less than 1.5dB; in particular, the average insertion loss of the filtering branch 120 is less than 1.5dB within a bandwidth range within 40MHz from the frequency of the upper cut-off frequency point m 2. The suppression (suppression, i.e., insertion loss, also referred to as loss) at the lower cutoff frequency point m1 is 2.369dB, and the suppression at the upper cutoff frequency point m2 is 1.698dB. I.e. the rejection of the filter branch 120 is less than 2.5dB over the bandwidth, i.e. the in-band loss of the filter branch 120 is small.
As shown in fig. 10, the points m3 and m4 are points on the frequency curve 20. The frequency at point m3 lies in the range 3579MHz to 3583MHz, and the rejection at point m3 is 64.947dB. The frequency at point m4 lies in the range 3805MHz to 3809MHz, and the rejection at point m4 is 17.451dB. The filter 10 of the present application is therefore able to achieve good out-of-band rejection performance.
The present application further provides a communication device, as shown in fig. 11, fig. 11 is a schematic diagram of an embodiment of the communication device of the present application.
As shown in fig. 11, the communication device 30 of this embodiment includes an antenna 32 and a Radio frequency Unit 31, where the antenna 32 is connected to the Radio frequency Unit 31, and the Radio frequency Unit 31 may be an RRU (Remote Radio Unit). The rf unit 31 includes the filter 10 disclosed in the above embodiments, and is used for filtering the rf signal.
In other embodiments, the rf Unit 31 may be integrated with the Antenna 32 to form an Active Antenna Unit (AAU).
The above are only embodiments of the present application, and not intended to limit the scope of the present application, and all equivalent structures or equivalent processes performed by the present application and the contents of the attached drawings, which are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (9)
1. A filter, comprising:
a housing having a first direction and a second direction perpendicular to each other;
the filtering branch is arranged on the shell and consists of ten filtering cavities which are sequentially coupled;
inductive cross coupling is performed between the first filter cavity and the third filter cavity of the filter branch circuit to form an inductive cross coupling zero point of the filter branch circuit, capacitive cross coupling elements are respectively arranged between the third filter cavity and the fifth filter cavity of the filter branch circuit, between the fifth filter cavity and the seventh filter cavity of the filter branch circuit, and between the seventh filter cavity and the ninth filter cavity of the filter branch circuit to form three capacitive cross coupling zero points of the filter branch circuit, wherein the bandwidth range of the filter branch circuit is 3600 MHz-3800 MHz;
the capacitive cross coupling element comprises a supporting clamping seat and a capacitive coupling probe, the supporting clamping seat is respectively arranged between the third filtering cavity and the fifth filtering cavity, between the fifth filtering cavity and the seventh filtering cavity and between the seventh filtering cavity and the ninth filtering cavity, and the capacitive coupling probe is arranged on the supporting clamping seat; one end of the capacitive coupling probe arranged between the third filtering cavity and the fifth filtering cavity is welded with the cavity of the third filtering cavity, and the other end of the capacitive coupling probe is welded with the cavity of the fifth filtering cavity; one end of the capacitive coupling probe arranged between the fifth filtering cavity and the seventh filtering cavity is welded with the cavity of the fifth filtering cavity, and the other end of the capacitive coupling probe is welded with the cavity of the seventh filtering cavity; one end of the capacitive coupling probe arranged between the seventh filtering cavity and the ninth filtering cavity is welded with the cavity of the seventh filtering cavity, and the other end of the capacitive coupling probe is welded with the cavity of the ninth filtering cavity;
the support cassette has the second direction and a third direction which are perpendicular to each other, wherein the third direction is also perpendicular to the first direction; the capacitive coupling probe is a metal sheet and comprises a first coupling part, a connecting part and a second coupling part; one end of the first coupling part is connected with one end of the connecting part, and the other end of the connecting part is connected with one end of the second coupling part;
the support clamping seat between the third filter cavity and the fifth filter cavity comprises a first part extending into the third filter cavity along the second direction and a second part extending into the fifth filter cavity along the second direction; wherein the capacitive coupling probe between the third filter cavity and the fifth filter cavity is disposed in the corresponding support card seat, and a first coupling portion of the capacitive coupling probe between the third filter cavity and the fifth filter cavity is located at a first portion of the corresponding support card seat, a second coupling portion of the capacitive coupling probe between the third filter cavity and the fifth filter cavity is located at a second portion of the corresponding support card seat, and an end of the first coupling portion of the capacitive coupling probe between the third filter cavity and the fifth filter cavity, which is far away from the corresponding connecting portion, extends out from an end of the corresponding support card seat along the third direction, so that an end of the first coupling portion of the capacitive coupling probe between the third filter cavity and the fifth filter cavity, which is far away from the corresponding connecting portion, is welded to a cavity of the third filter cavity; one end, far away from the corresponding connecting part, of the second coupling part of the capacitive coupling probe between the third filtering cavity and the fifth filtering cavity extends out of the other end, far away from the corresponding connecting part, of the support clamping seat along the third direction, so that one end, far away from the corresponding connecting part, of the second coupling part of the capacitive coupling probe between the third filtering cavity and the fifth filtering cavity is welded with the cavity of the fifth filtering cavity.
2. The filter of claim 1,
ten filter cavities of the filter branch circuit are divided into two rows arranged along the first direction;
the first filtering cavity, the third filtering cavity, the fifth filtering cavity, the seventh filtering cavity and the ninth filtering cavity of the filtering branch are in a row and are sequentially arranged along the second direction;
and the second filtering cavity, the fourth filtering cavity, the sixth filtering cavity, the eighth filtering cavity and the tenth filtering cavity of the filtering branch are in a row and are sequentially arranged along the second direction.
3. The filter of claim 2,
the third filtering cavity of the filtering branch is respectively adjacent to the first filtering cavity, the second filtering cavity, the fourth filtering cavity and the fifth filtering cavity of the filtering branch;
and the seventh filtering cavity of the filtering branch is respectively adjacent to the fifth filtering cavity, the sixth filtering cavity, the eighth filtering cavity and the ninth filtering cavity of the filtering branch.
4. The filter of claim 2,
the projection of the center of the second filter cavity of the filter branch in the second direction is further located between the projection of the center of the first filter cavity of the filter branch in the second direction and the projection of the center of the third filter cavity of the filter branch in the second direction;
the projection of the center of the ninth filter cavity of the filter branch in the second direction is further located between the projection of the center of the eighth filter cavity of the filter branch in the second direction and the projection of the center of the tenth filter cavity of the filter branch in the second direction.
5. The filter of claim 2,
the second filtering cavity and the tenth filtering cavity are provided with a first mounting column, a metal resonance rod and a first tuning screw rod;
the metal resonance rod comprises a first U-shaped side wall, a first hollow inner cavity is formed in the first U-shaped side wall, two ends of the first U-shaped side wall bend and extend in a direction departing from the first hollow inner cavity, so that disc-shaped structures are formed at two ends of the first U-shaped side wall, and the disc-shaped structures are arranged in parallel with the bottom of the first U-shaped side wall;
one end of the first tuning screw is arranged in the first hollow inner cavity;
wherein the first U-shaped side wall is fixed on the first mounting column.
6. The filter of claim 5,
each of the first filtering cavity, the third filtering cavity and the ninth filtering cavity is provided with a medium resonant rod and a second tuning screw rod;
the dielectric resonance rod comprises a tubular side wall, and a second hollow inner cavity is formed in the tubular side wall;
one end of the second tuning screw is arranged in the second hollow inner cavity;
wherein, both ends of the tubular side wall are welded to the cavity of the filter cavity where the tubular side wall is located.
7. The filter of claim 6,
the first filtering cavity is coupled to the tenth filtering cavity in sequence, wherein the two adjacent filtering cavities are coupled through a window.
8. The filter of claim 7,
metal coupling ribs are arranged between the first filtering cavity and the second filtering cavity, between the second filtering cavity and the third filtering cavity, between the third filtering cavity and the fourth filtering cavity, between the fourth filtering cavity and the fifth filtering cavity, between the fifth filtering cavity and the sixth filtering cavity, between the sixth filtering cavity and the seventh filtering cavity, between the seventh filtering cavity and the eighth filtering cavity, between the eighth filtering cavity and the ninth filtering cavity, and between the ninth filtering cavity and the tenth filtering cavity.
9. A communication device, characterized in that the communication device comprises an antenna and a radio frequency unit connected with the antenna; the radio frequency unit comprising a filter according to any of claims 1-8 for filtering a radio frequency signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010409581.XA CN113675563B (en) | 2020-05-14 | 2020-05-14 | Filter and communication equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010409581.XA CN113675563B (en) | 2020-05-14 | 2020-05-14 | Filter and communication equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113675563A CN113675563A (en) | 2021-11-19 |
| CN113675563B true CN113675563B (en) | 2023-03-10 |
Family
ID=78537446
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010409581.XA Active CN113675563B (en) | 2020-05-14 | 2020-05-14 | Filter and communication equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113675563B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6529750B1 (en) * | 1998-04-03 | 2003-03-04 | Conductus, Inc. | Microstrip filter cross-coupling control apparatus and method |
| CN202855879U (en) * | 2012-09-18 | 2013-04-03 | 武汉凡谷电子技术股份有限公司 | Adjustable electric coupling structure between TEM die metal chamber and TM die medium chamber in filter |
| CN205790303U (en) * | 2016-07-05 | 2016-12-07 | 摩比天线技术（深圳）有限公司 | Cavity body filter |
| CN208478530U (en) * | 2018-08-10 | 2019-02-05 | 鑫联波通信（东莞）有限公司 | A kind of miniaturization tunable capacitor cross-coupling suitable for communication products |
| CN209232915U (en) * | 2018-12-21 | 2019-08-09 | 深圳市大富科技股份有限公司 | Duplexer and communication radio frequency device |
-
2020
- 2020-05-14 CN CN202010409581.XA patent/CN113675563B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6529750B1 (en) * | 1998-04-03 | 2003-03-04 | Conductus, Inc. | Microstrip filter cross-coupling control apparatus and method |
| CN202855879U (en) * | 2012-09-18 | 2013-04-03 | 武汉凡谷电子技术股份有限公司 | Adjustable electric coupling structure between TEM die metal chamber and TM die medium chamber in filter |
| CN205790303U (en) * | 2016-07-05 | 2016-12-07 | 摩比天线技术（深圳）有限公司 | Cavity body filter |
| CN208478530U (en) * | 2018-08-10 | 2019-02-05 | 鑫联波通信（东莞）有限公司 | A kind of miniaturization tunable capacitor cross-coupling suitable for communication products |
| CN209232915U (en) * | 2018-12-21 | 2019-08-09 | 深圳市大富科技股份有限公司 | Duplexer and communication radio frequency device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113675563A (en) | 2021-11-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN210015937U (en) | Filter, communication and radio frequency remote equipment, transceiver and tower top amplifier | |
| CN211719756U (en) | Filter and communication equipment | |
| CN113675563B (en) | Filter and communication equipment | |
| CN113851803A (en) | Filter and communication equipment | |
| CN212323177U (en) | Filter and communication equipment | |
| CN211125982U (en) | Communication device and filter thereof | |
| CN212323179U (en) | Filter and communication equipment | |
| CN212323176U (en) | Filter and communication equipment | |
| CN113131145A (en) | Filter and communication equipment | |
| CN113922024A (en) | Filter and communication equipment | |
| CN113675557A (en) | Filter and communication equipment | |
| CN113540721B (en) | Filter and communication equipment | |
| CN113809493A (en) | Filter and communication device | |
| CN113675562A (en) | Filter and communication equipment | |
| CN216214004U (en) | Filter and communication device | |
| CN211125985U (en) | Filter and communication equipment | |
| CN113497319A (en) | Filter and communication equipment | |
| CN216354694U (en) | Filter and communication device | |
| CN113675558A (en) | Filter and communication equipment | |
| CN113497313B (en) | Communication device and filter thereof | |
| CN211125970U (en) | Communication device and filter thereof | |
| CN211150738U (en) | Dual-passband adjustable microstrip filter | |
| CN216214003U (en) | Filter and communication device | |
| CN212323178U (en) | Filter and communication equipment | |
| CN113571857A (en) | Filter and communication equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |