CN113851803A - Filter and communication equipment - Google Patents
Filter and communication equipment Download PDFInfo
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- CN113851803A CN113851803A CN202010601604.7A CN202010601604A CN113851803A CN 113851803 A CN113851803 A CN 113851803A CN 202010601604 A CN202010601604 A CN 202010601604A CN 113851803 A CN113851803 A CN 113851803A
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- 238000004891 communication Methods 0.000 title claims abstract description 14
- 238000001914 filtration Methods 0.000 claims abstract description 156
- 238000006880 cross-coupling reaction Methods 0.000 claims abstract description 24
- 230000008878 coupling Effects 0.000 claims description 47
- 238000010168 coupling process Methods 0.000 claims description 47
- 238000005859 coupling reaction Methods 0.000 claims description 47
- 239000002184 metal Substances 0.000 claims description 23
- 239000000523 sample Substances 0.000 claims description 21
- 230000001939 inductive effect Effects 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 4
- 229920006351 engineering plastic Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 16
- 230000005540 biological transmission Effects 0.000 description 9
- 230000001629 suppression Effects 0.000 description 7
- 238000002955 isolation Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 229910001374 Invar Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000012827 research and development Methods 0.000 description 1
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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
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
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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
- H01P1/212—Frequency-selective devices, e.g. filters suppressing or attenuating harmonic frequencies
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Abstract
The application discloses wave filter and communication equipment, this wave filter includes: 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 nine filtering cavities which are coupled in sequence; and a capacitive cross coupling element is arranged between the fifth filtering cavity and the seventh filtering cavity of the filtering branch to form a capacitive cross coupling zero point of the filtering branch, wherein the bandwidth range of the filtering branch is 3400 MHz-3600 MHz. By the mode, the cross-coupling zero point is 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 signals outside the pass band.
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 a filtering 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 nine filtering cavities which are coupled in sequence; and a capacitive cross coupling element is arranged between the fifth filtering cavity and the seventh filtering cavity of the filtering branch to form a capacitive cross coupling zero point of the filtering branch, wherein the bandwidth range of the filtering branch is 3400 MHz-3600 MHz.
Further, nine 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; the second filtering cavity, the fourth filtering cavity, the sixth filtering cavity and the eighth filtering cavity of the filtering branch are in a row and are sequentially arranged along the second direction.
Furthermore, 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 eighth filter cavity of the filter branch in the second direction is further located between the projection of the center of the seventh filter cavity of the filter branch in the second direction and the projection of the center of the ninth filter cavity of the filter branch in the second direction.
Furthermore, the capacitive cross coupling element comprises a supporting clamping seat and a capacitive coupling probe, the supporting clamping seat is arranged between the fifth filtering cavity and the seventh filtering cavity, the capacitive coupling probe is arranged on the supporting clamping seat, one end of the capacitive coupling probe 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; the capacitive coupling probe comprises a metal sheet, and the material of the support clamping seat comprises PTFE or engineering plastics.
Furthermore, the second filter cavity and the ninth filter 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 eighth 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.
Further, a window is arranged between the first filtering cavity and the ninth filtering cavity which are sequentially coupled.
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, and between the eighth filtering cavity and the ninth 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: an inductive cross coupling zero point is generated at the high end of the pass band through the inductive cross coupling between the first filter cavity and the third filter cavity of the filter branch, and a capacitive cross coupling zero point is generated at the low end of the pass band through the capacitive cross coupling between the fifth filter cavity and the seventh filter cavity of the filter branch. Therefore, a cross coupling zero is respectively generated at the high end of the passband 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 structural diagram of a fifth filter cavity and a seventh filter cavity of the filter branch circuit provided in the present application;
FIG. 4 is an enlarged schematic view of the metal coupling probe and the support cartridge of FIG. 3;
FIG. 5 is a schematic structural diagram of a second filter cavity and a ninth filter cavity provided in the present application;
fig. 6 is a schematic structural diagram of a filter cavity from the first filter cavity, the third filter cavity to the eighth filter cavity provided in the present application;
FIG. 7 is a schematic diagram of a three-dimensional structure of a filter provided herein;
FIG. 8 is a schematic diagram illustrating simulation of the filtering branch of the filter provided in the present application;
fig. 9 is a diagram of an embodiment of a communication device of 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 in the claims of the present application and in the drawings described above, 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 according to 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 circuit 120 is arranged on the shell 110 and consists of nine filtering cavities A1-A9 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 according to 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 L shown in fig. 2; a capacitive cross-coupling element is disposed between the fifth filter cavity a5 and the seventh filter cavity a7 of the filter branch 120 to form a capacitive cross-coupling zero of the filter branch 120, which is equivalent to the capacitor C shown in fig. 2, wherein the bandwidth of the filter branch 120 is 3400 MHz-3600 MHz.
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 can not pass through the network, thus playing a role of complete isolation, playing a role of inhibiting signals outside the pass band, and better realizing high isolation between the pass band and the outside. 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 a capacitive cross-coupling zero is generated at the low end of the pass band by 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. Therefore, a coupling zero point is respectively generated at the high end and the low end of the passband, so that the debugging index is convenient, the signals outside the passband can be inhibited, and the isolation degree between the signals inside the passband of the filter 10 and the signals outside the passband is improved.
Referring to fig. 1, in particular, the nine filter cavities a1-a9 of the filter branch 120 are divided into two columns arranged along the 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 filter cavity a2, the fourth filter cavity a4, the sixth filter cavity a6 and the eighth filter cavity A8 of the filter branch 120 are in a row and are sequentially arranged along the second direction L.
By dividing the nine filter cavities a1-a9 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 compared to the irregular arrangement in the prior art, and the volume of the filter 10 can be reduced by the regular arrangement.
The space utilization of the filter 10 may be improved by disposing one filter cavity adjacent to a plurality of filter cavities, respectively, 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 arranging the relative positions of the two rows of filter cavities reasonably, 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 eighth filter cavity A8 of the filter branch 120 in the second direction L is further located between the projection of the center of the seventh filter cavity a7 of the filter branch 120 in the second direction L and the projection of the center of the ninth filter cavity a9 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 is located in the projection of the row of the first filter cavity a1 in the second direction L, 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 arranged in an M shape; the fifth filtering cavity a5 of the filtering branch 120 to the ninth filtering cavity a9 of the filtering branch 120 may be arranged in an M shape; the fourth filter chamber a4 through the sixth filter chamber a6 of the filter arm 120 may be arranged in a V-shape. Therefore, the filter cavities are arranged regularly, and the filter cavities in a row where the second filter cavity A2 is located and the filter cavities in a row where the first filter cavity A1 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, fig. 3 is a schematic structural diagram of a fifth filter cavity and a seventh filter cavity of the filter branch circuit provided in the present application.
As shown in fig. 3, further, the capacitive cross coupling element includes a supporting card holder 130 and a capacitive coupling probe 140, the supporting card holder 130 is disposed between the fifth filtering cavity a5 and the seventh filtering cavity a7, the capacitive coupling probe 140 is disposed on the supporting card holder 130, one end of the capacitive coupling probe 140 is welded to the cavity of the fifth filtering cavity a5, and the other end of the capacitive coupling probe 140 is welded to the cavity of the seventh filtering cavity a 7; the capacitive coupling probe 140 comprises a metal sheet and the material supporting the cartridge 130 comprises PTFE or engineering plastic.
Specifically, a window may be opened between the fifth filter chamber a5 and the seventh filter chamber a7, and the support holder 130 may be disposed at the window. 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.
Referring to fig. 4, fig. 4 is an enlarged schematic view of the metal coupling probe and the supporting card seat in fig. 3.
As shown in fig. 4, 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.
With reference to fig. 3 and 4, the first coupling portion 141 extends into the fifth filter cavity a5 to couple with the fifth filter cavity a5, the second coupling portion 143 extends into the seventh filter cavity a7 to couple with the seventh filter cavity a7, an end of the first coupling portion 141 away from the connecting portion 142 is welded to a cavity of the fifth filter cavity a5, and an end of the second coupling portion 143 away from the connecting portion 142 is welded to a cavity of the seventh filter cavity a 7. This enables the metal coupling probe 140 to achieve a double-ended short circuit.
To better secure the metal coupling probe 140, the support socket 130 may include a first portion extending into the fifth filter cavity a5 along the second direction L and a second portion extending into the seventh filter cavity 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. An end of the first coupling part 141 away from the connecting part 142 may extend from an end of the support socket 130 in the third direction H, so that the end of the first coupling part 141 away from the connecting part 142 is welded with the cavity of the fifth filter cavity a 5; an end of the second coupling portion 143 away from the connection portion 142 may protrude from the other end of the support socket 130 in the third direction H, so that the end of the second coupling portion 143 away from the connection portion 142 is welded with the cavity of the seventh filter cavity a 7.
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 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.
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 fifth filter chamber a5 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 seventh filter chamber a7 and the cover body 200.
Referring to fig. 5, fig. 5 is a schematic structural diagram of the filter cavities of the second filter cavity and the ninth filter cavity provided in the present application.
The second filter chamber a2 and the ninth filter chamber a9 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 disposed on the bottom wall 101 of the second filter chamber a2 and the bottom wall 101 of the ninth filter chamber a 9. The cover 200 of the second filter cavity a2 and the cover 200 of the ninth filter cavity a9 may be provided with a first screw hole, and the first tuning screw 170 may be inserted into 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. 6, fig. 6 is a schematic structural diagram of a filter cavity from the first filter cavity, the third filter cavity to the eighth filter cavity provided in the present application.
As shown in fig. 6, each of the first filter chamber a1, the third filter chamber A3 through the eighth filter chamber A8 is provided with a dielectric resonance rod 180 and a second tuning screw 190; the dielectric resonance rod 180 may be a TM mode resonance 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. 6 and fig. 5, in this embodiment, by reasonably setting the structures of the nine filter cavities a1-a9, the resonant rods inside the second filter cavity a2 and the ninth filter cavity a9 are the metal resonant rods 160, and the resonant rods inside the first filter cavity a1, the third filter cavity A3 to the eighth filter cavity A8 are the dielectric resonant rods 180. Since the insertion loss of the dielectric resonance rod 180 is small, the power consumption of the filter 10 can be reduced, and the first filter cavity a1, the third filter cavity A3 to the eighth filter cavity A8 can bear a larger resonance 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. 7, fig. 7 is a schematic diagram of a three-dimensional structure of the filter provided in the present application.
As shown in fig. 7, a window 300 is formed between two filter cavities coupled in sequence from the first filter cavity a1 to the ninth filter cavity a 9. A coupling adjusting screw 500 may be provided in each opened window 300. The first filter chamber a1 through the ninth filter chamber a9 may be coupled using a pure window. Thus, materials can be saved, and the production cost of the filter 10 can be reduced.
The metal coupling rib 400 may also be disposed between two sequentially coupled filter cavities in the first filter cavity a1 to the ninth filter cavity a9, 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, and between the eighth filter cavity A8 and the ninth filter cavity a 9. Thus, the coupling strength of the two filter cavities coupled in sequence is enhanced by the metal coupling rib 400.
A window 300 may be disposed between the first filter cavity a1 and the third filter cavity A3, and a metal coupling rib 400 is disposed in the window 300, so as to achieve inductive cross coupling between the first filter cavity a1 and the third filter cavity A3.
Referring to fig. 8, fig. 8 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. 8. Here, the point m1 is a lower-limit cutoff frequency point, and the point m2 is an upper-limit cutoff frequency point. The frequency of the lower-limit cutoff frequency point m1 is 3400MHz, the frequency of the upper-limit cutoff frequency point m2 is 3600MHz, that is, the simulated bandwidth of the filtering branch circuit 120 is within the range of 3400MHz to 3600 MHz. 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 1.2dB in the bandwidth range. Wherein, the suppression (suppression, i.e. insertion loss, sometimes also referred to as loss) at the lower limit cut-off frequency point m1 is 1.408dB, and the suppression at the upper limit cut-off frequency point m2 is 1.437dB, that is, within the bandwidth range, the suppression of the filter branch 120 is less than 1.5dB, that is, the in-band loss of the filter branch 120 is small.
As shown in fig. 8, point m3 and point m4 are transmission zeros. The frequency of the transmission zero point m3 is in the range of 3379MHz to 3381MHz, and the suppression at the transmission zero point m3 is 49.394 dB. The frequency of the transmission zero point m4 is in the range of 3619MHz to 3621MHz, and the suppression at the transmission zero point m4 is 47.734 dB. 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. 9, fig. 9 is a schematic diagram of an embodiment of the communication device of the present application.
As shown in fig. 9, 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 embodiments are merely examples and are not intended to limit the scope of the present disclosure, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present disclosure or those directly or indirectly applied to other related technical fields are intended to be included in the scope of the present disclosure.
Claims (10)
1. A filter, characterized in that the filter comprises:
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 nine filtering cavities which are coupled in sequence;
and the first filtering cavity and the third filtering cavity of the filtering branch are inductively and cross-coupled to form an inductive cross-coupling zero point of the filtering branch, and a capacitive cross-coupling element is arranged between the fifth filtering cavity and the seventh filtering cavity of the filtering branch to form a capacitive cross-coupling zero point of the filtering branch, wherein the bandwidth range of the filtering branch is 3400 MHz-3600 MHz.
2. The filter of claim 1,
nine 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 and the eighth 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 eighth filter cavity of the filter branch in the second direction is further located between the projection of the center of the seventh filter cavity of the filter branch in the second direction and the projection of the center of the ninth filter cavity of the filter branch in the second direction.
5. The filter according to any of claims 1-4,
the capacitive cross coupling element comprises a supporting clamping seat and a capacitive coupling probe, the supporting clamping seat is arranged between the fifth filtering cavity and the seventh filtering cavity, the capacitive coupling probe is arranged on the supporting clamping seat, one end of the capacitive coupling probe 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;
the capacitive coupling probe comprises a metal sheet, and the material of the support clamping seat comprises PTFE or engineering plastics.
6. The filter of claim 5,
the second filtering cavity and the ninth 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.
7. The filter of claim 6,
each of the first filtering cavity, the third filtering cavity and the eighth filtering cavity is provided with a medium resonance 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.
8. The filter of claim 7,
and a window is arranged between the first filtering cavity and the ninth filtering cavity which are sequentially coupled.
9. The filter of claim 8,
the first filtering cavity and the second filtering cavity, the second filtering cavity and the third filtering cavity, the third filtering cavity and the fourth filtering cavity, the fourth filtering cavity and the fifth filtering cavity, the fifth filtering cavity and the sixth filtering cavity, the sixth filtering cavity and the seventh filtering cavity, the seventh filtering cavity and the eighth filtering cavity, and the eighth filtering cavity and the ninth filtering cavity are all provided with metal coupling ribs.
10. 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 1-9 for filtering a radio frequency signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010601604.7A CN113851803A (en) | 2020-06-28 | 2020-06-28 | Filter and communication equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010601604.7A CN113851803A (en) | 2020-06-28 | 2020-06-28 | Filter and communication equipment |
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| CN113851803A true CN113851803A (en) | 2021-12-28 |
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| CN202010601604.7A Pending CN113851803A (en) | 2020-06-28 | 2020-06-28 | Filter and communication equipment |
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Application publication date: 20211228 |