CN211125972U - Filter and communication equipment - Google Patents

Abstract

The application discloses wave filter and communication equipment, this wave filter includes: a housing having a first direction and a second direction perpendicular to each other; the first filtering branch is arranged on the first side of the shell and consists of seven filtering cavities which are sequentially coupled, and the seven filtering cavities of the first filtering branch further form three cross-coupling zeros; the second filtering branch is arranged on the second side of the shell and consists of five filtering cavities which are sequentially coupled, and the five filtering cavities of the second filtering branch further form two capacitive cross-coupling zeros; the seven filter cavities of the first filter branch are divided into three rows arranged in the second direction, and the five filter cavities of the second filter branch are divided into three rows arranged in the second direction. In this way, the first side and the second side of the shell of the filter are provided with the filtering branch circuits, so that the size of the filter can be reduced, and the cost is reduced.

Description

Filter and communication equipment

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 device, 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 bandwidth.

The inventor of this application discovers in long-term research and development work that the wave filter is provided with at least first filtering branch road and second filtering branch road among the prior art, and first filtering branch road and second filtering branch road all set up on the same one side of wave filter casing, lead to the bulky of wave filter.

SUMMERY OF THE UTILITY MODEL

The application provides a filter and communication equipment to solve the technical problem that the filter is large in size in the prior art.

An embodiment of the present application provides a filter, including:

a housing having a first direction and a second direction perpendicular to each other;

the first filtering branch is arranged on the first side of the shell and consists of seven filtering cavities which are sequentially coupled, and the seven filtering cavities of the first filtering branch further form three cross-coupling zeros;

the second filtering branch is arranged on the second side of the shell and consists of five filtering cavities which are sequentially coupled, and the five filtering cavities of the second filtering branch further form two capacitive cross-coupling zeros;

seven filter cavities of the first filter branch are divided into three rows arranged along the second direction, and five filter cavities of the second filter branch are divided into three rows arranged along the second direction.

Different from the prior art, the first filtering branch is arranged on the first side of the shell, and the second filtering branch is arranged on the second side of the shell, namely the first side and the second side of the shell are both provided with the filtering branches, so that the size of the filter can be reduced, and the cost is reduced; the seven filter cavities of the first filter branch are divided into three rows arranged along the second direction, and the five filter cavities of the second filter branch are divided into three rows arranged along the second direction, i.e. the seven filter cavities of the first filter branch and the five filter cavities of the second filter branch are regularly arranged, so that the design and debugging of the filter are facilitated.

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 structural diagram of an embodiment of a first filtering branch of a filter provided in the present application;

fig. 2 is a schematic structural diagram of an embodiment of a second filtering branch of the filter provided in the present application;

fig. 3 is a schematic diagram of a topology of a first filtering branch provided in the present application;

fig. 4 is a schematic diagram of a topology of a second filtering branch provided in the present application;

FIG. 5 is a diagram illustrating simulation results of a filter provided herein;

fig. 6 is a schematic structural diagram of an embodiment of a third filtering branch of the filter provided in the present application;

fig. 7 is a schematic structural diagram of an embodiment of a fourth filtering branch of the filter provided in the present application;

fig. 8 is a schematic diagram of a topology of a third filtering branch provided in the present application;

fig. 9 is a schematic diagram of a topology of a fourth filtering branch provided in the present application;

fig. 10 is a schematic structural diagram of an embodiment of a communication device provided in 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.

Referring to fig. 1-2, fig. 1 is a schematic structural diagram of an embodiment of a first filtering branch of a filter provided by the present application, and fig. 2 is a schematic structural diagram of an embodiment of a second filtering branch of the filter provided by the present application, the filter of the present embodiment includes a housing, a first filtering branch 12 and a second filtering branch 13, the housing has a first direction L1 and a second direction L2 perpendicular to the first direction L1, the first direction L1 may be a length direction of the housing, and the second direction L2 may be a width direction of the housing, the housing further includes a first side 111 and a second side 112, and the first side 111 and the second side 112 are disposed opposite to each other.

As shown in fig. 1, the first filtering branch 12 is disposed on the first side 111 of the housing and is composed of seven filtering cavities coupled in sequence, and the seven filtering cavities of the first filtering branch 12 form three cross-coupling zeros; the seven filter cavities of the first filter branch 12 are a first filter cavity a1, a second filter cavity a2, a third filter cavity A3, a fourth filter cavity a4, a fifth filter cavity a5, a sixth filter cavity a6 and a seventh filter cavity a7 of the first filter branch 12.

As shown in fig. 2, the second filtering branch 13 is disposed on the second side 112 of the housing and is composed of five filtering cavities coupled in sequence, and the five filtering cavities of the second filtering branch 13 form two capacitive cross-coupling zeros; the five filter cavities of the second filter branch 13 are a first filter cavity B1, a second filter cavity B2, a third filter cavity B3, a fourth filter cavity B4 and a fifth filter cavity B5 of the second filter branch 13.

The first filtering branch 12 is disposed on the first side 111 of the housing, and the second filtering branch 13 is disposed on the second side 112 of the housing, that is, the first side 111 and the second side 112 of the housing are both provided with filtering branches, so as to reduce the length or width of the housing, reduce the size of the filter, and reduce the cost.

As shown in fig. 1, the seven filter cavities of the first filter branch 12 are divided into three rows arranged along the second direction L, the five filter cavities of the second filter branch 13 are divided into three rows arranged along the second direction L2, the seven filter cavities of the first filter branch 12 and the five filter cavities of the second filter branch 13 are regularly arranged, so as to facilitate the design and debugging of the filter, the seventh filter cavity a7, the sixth filter cavity A6 and the fifth filter cavity a5 of the first filter branch 12 are arranged in one row and sequentially arranged along the first direction L, the third filter cavity A3 and the fourth filter cavity A4 of the first filter branch 12 are arranged in one row and sequentially arranged along the first direction L, the second filter cavity a2 and the first filter cavity a1 of the first filter branch 12 are arranged in one row and sequentially arranged along the first direction L, the fourth filter cavity B4 and the fifth filter cavity B6329 of the second filter branch 13 are arranged in one row and sequentially arranged along the first direction B5961, and the fourth filter cavity B4 and the fifth filter cavity B3 of the first filter branch 12 are sequentially arranged along the first direction 638, so that the first filter cavity B2 and the third filter cavity B3 of the first branch 13 are reasonably arranged sequentially arranged along the first direction.

The third filtering cavity A3 of the first filtering branch 12 is respectively adjacent to the first filtering cavity a1, the second filtering cavity a2, the fourth filtering cavity a4, the sixth filtering cavity a6 and the seventh filtering cavity a 7; the fifth filter cavity a5 of the first filter branch 12 is respectively arranged adjacent to the fourth filter cavity a4 and the sixth filter cavity a 6; the third filter cavity B3 of the second filter branch 13 is respectively adjacent to the first filter cavity B1, the second filter cavity B2, the fourth filter cavity B4 and the fifth filter cavity B5. That is, two filter cavities in the first filter branch 12 and the second filter branch 14 are disposed adjacently, which can reduce the distance between the two filter cavities, so that the seven filter cavities of the first filter branch 12 are disposed compactly, and the five filter cavities of the second filter branch 14 are disposed compactly.

As shown in fig. 1 and 3, fig. 3 is a schematic diagram of a topology of a first filtering branch provided in the present application. Capacitive cross coupling is respectively performed between the first filter cavity a1 and the third filter cavity A3 of the first filter branch 12 and between the fourth filter cavity a4 and the sixth filter cavity a6, and inductive cross coupling is performed between the first filter cavity a1 and the fourth filter cavity a4 of the first filter branch 12, so as to form three cross-coupling zeros of the first filter branch 12. Typically, the inductive cross-coupling element may be a metal rib, i.e. a metal rib is arranged between the first filter cavity a1 and the fourth filter cavity a 4. Typically the capacitive cross-coupling element may be a flying rod, i.e. a flying rod is arranged between the first filter chamber a1 and the third filter chamber A3. The first filtering branch 12 realizes zero suppression by setting three cross-coupling zeros, so that the first filtering branch 12 meets design requirements, and debugging is facilitated.

The cross-coupling zero is also referred to as a transmission zero. The transmission zero is the transmission function of the filter is equal to zero, namely, the electromagnetic energy cannot pass through the network on the frequency point corresponding to the transmission zero, so that the full isolation effect is achieved, the suppression effect on signals outside the passband is achieved, and the high isolation among the multiple passbands can be better achieved.

As shown in fig. 1 and 4, fig. 4 is a schematic diagram of a topology of a second filtering branch provided in the present application. Capacitive cross coupling is respectively formed between the first filter cavity B1 and the third filter cavity B3 and between the third filter cavity B3 and the fifth filter cavity B5 of the second filter branch 13, so as to form two capacitive cross-coupling zeros of the second filter branch 13. The second filtering branch 13 realizes zero point suppression by setting two capacitive cross-coupling zero points, so that the second filtering branch 13 meets the design requirements and is convenient to debug.

The housing of this embodiment is further provided with a first port (not shown), a second port (not shown), a third port (not shown), and a fourth port (not shown), the first filter cavity a1 of the first filter branch 12 is connected to the first port, the seventh filter cavity a7 of the first filter branch 12 is connected to the second port, the first filter cavity B1 of the second filter branch 13 is connected to the third port, and the fifth filter cavity B5 of the second filter branch 13 is connected to the fourth port. The first port, the second port, the third port and the fourth port are taps of the filter, the first port and the third port may be input ports, and the second port and the fourth port may be output ports.

In the first filtering branch 12, the coupling bandwidth between the first port and the first filtering cavity a1, the coupling bandwidth between the first filtering cavity a1 and the second filtering cavity a2, the coupling bandwidth between the first filtering cavity a1 and the third filtering cavity A3, the coupling bandwidth between the first filtering cavity a1 and the fourth filtering cavity a4, the coupling bandwidth between the second filtering cavity a2 and the third filtering cavity A3, the coupling bandwidth between the third filtering cavity A3 and the fourth filtering cavity a4, the coupling bandwidth between the fourth filtering cavity a4 and the fifth filtering cavity A5, the coupling bandwidth between the fourth filtering cavity a4 and the sixth filtering cavity A6, the coupling bandwidth between the fifth filtering cavity A5 and the sixth filtering cavity A6, the coupling bandwidth between the sixth filtering cavity A6 and the seventh filtering cavity a7, and the coupling bandwidth between the seventh filtering cavity a7 and the second filtering cavity a7, respectively, are as follows: 17MHz-23MHz, 13MHz-19MHz, 0MHz-4MHz, 9MHz-14MHz, (-2) MHz-2MHz, 8MHz-13MHz, 6MHz-12MHz, 3MHz-8MHz, 7MHz-13MHz, 13MHz-19MHz, 17MHz-23 MHz.

The resonant frequencies of the first filter cavity a1 through the seventh filter cavity a7 of the first filter branch 12 are sequentially in the following ranges: 1866MHz to 1868MHz, 1868MHz to 1871MHz, 1866MHz to 1868MHz, 1871MHz to 1873MHz, 1866MHz to 1868MHz, and 1866MHz to 1868 MHz. Therefore, the bandwidth of the first filtering branch 12 of this embodiment is located in the range of 1857-1880MHz, and the bandwidth of the first filtering branch 12 can be accurately controlled, so as to meet the design requirement of the filter.

As shown in fig. 5, fig. 5 is a schematic diagram of simulation results of the first filtering branch and the third filtering branch provided in the present application. The simulated bandwidth of the first filtering branch 12 in this embodiment is as shown in the frequency band curve 51 in fig. 5, and it can be obtained that the simulated bandwidth of the first filtering branch 12 is located in the range of 1857-1880MHz, which meets the design requirement of the filter and can accurately control the bandwidth of the first filtering branch 12.

In the frequency band range of 9kHz-1626.5MHz, the suppression of the first filtering branch 12 is greater than or equal to 100 dB; in the frequency band range of 1626.5-1660.5MHz, the rejection of the first filter branch 12 is greater than or equal to 111 dB; within the frequency band range of 1660.5-1710MHz, the suppression of the first filtering branch 12 is greater than or equal to 100 dB; within the range of 1710-1780MHz, the rejection of the first filtering branch 12 is greater than or equal to 110 dB; in the range of 1780-1785MHz frequency band, the rejection of the first filtering branch 12 is greater than or equal to 105 dB; in the range of 1785-1795MHz, the rejection of the first filtering branch 12 is greater than or equal to 25 dB; in the frequency range of 1795-1850MHz, the suppression of the first filtering branch 12 is greater than or equal to 25 dB; in the range of 1885-1920MHz, the rejection of the first filtering branch 12 is greater than or equal to 48 dB; in the frequency band range of 1920-1925MHz, the rejection of the first filtering branch 12 is greater than or equal to 83 dB; in the range of 1925-1980MHz, the rejection of the first filtering branch 12 is greater than or equal to 88 dB; in the range of 1980-2025MHz, the rejection of the first filtering branch 12 is greater than or equal to 111 dB; in the range of the frequency band of 2025 and 2400MHz, the rejection of the first filtering branch 12 is greater than or equal to 80 dB; within the range of 2400-3800MHz, the rejection of the first filtering branch 12 is greater than or equal to 70 dB; in the frequency range of 3800-5640MHz, the rejection of the first filtering branch 12 is greater than or equal to 20 dB; within the range of the frequency band of 7220-7520MHz, the rejection of the first filtering branch 12 is greater than or equal to 26 dB; in the range of the frequency band of 9025-9400MHz, the suppression of the first filtering branch 12 is greater than or equal to 26 dB; within the frequency range of 10830-11280MHz, the rejection of the first filtering branch 12 is greater than or equal to 15 dB; the out-of-band rejection etc. of the first filtering branch 12 can thus be improved.

In the second filtering branch 13, the coupling bandwidth between the third port and the first filtering cavity B1, the coupling bandwidth between the first filtering cavity B1 and the second filtering cavity B2, the coupling bandwidth between the first filtering cavity B1 and the third filtering cavity B3, the coupling bandwidth between the second filtering cavity B2 and the third filtering cavity B3, the coupling bandwidth between the third filtering cavity B3 and the fourth filtering cavity B4, the coupling bandwidth between the third filtering cavity B3 and the fifth filtering cavity B5, the coupling bandwidth between the fourth filtering cavity B4 and the fifth filtering cavity B5, and the coupling bandwidth between the fifth filtering cavity B5 and the fourth port are respectively in the following ranges:

20MHz-27MHz, 15MHz-22MHz, 0MHz-5MHz, 10MHz-16MHz, 2MHz-7MHz, 15MHz-21MHz, and 20MHz-27 MHz.

The resonant frequencies of the first filter cavity B1 through the fifth filter cavity B5 of the second filter branch 13 are sequentially in the following ranges: 1771MHz to 1773MHz, 1773MHz to 1775MHz, 1771MHz to 1773MHz, 1774MHz to 1776MHz and 1771MHz to 1773 MHz. Therefore, the bandwidth of the second filtering branch 13 of this embodiment is located in the range of 1761-1785MHz, which can accurately control the bandwidth of the second filtering branch 13, and meet the design requirement of the filter.

The simulated bandwidth of the second filtering branch 13 in this embodiment is as shown in the frequency band curve 52 in fig. 5, and it can be obtained that the simulated bandwidth of the second filtering branch 13 is located in the range of 1761-1785MHz, which meets the design requirement of the filter, and can accurately control the bandwidth of the second filtering branch 13.

Within the frequency range of 9kHz-1420MHz, the suppression of the second filtering branch 13 is greater than or equal to 85 dB; within the frequency band range of 1420-; in the frequency range of 1670-1690MHz, the suppression of the second filtering branch 13 is greater than or equal to 25 dB; within the frequency range of 1690 and 1745MHz, the suppression of the second filtering branch 13 is greater than or equal to 25 dB; within the range of 1795-1805MHz, the suppression of the second filtering branch 13 is greater than or equal to 30 dB; within the frequency range of 1805-1830MHz, the suppression of the second filtering branch 13 is greater than or equal to 75 dB; in the 1830 and 1880MHz frequency band range, the suppression of the second filtering branch 13 is greater than or equal to 85 dB; in the range of 1880-2690MHz, the suppression of the second filtering branch 13 is greater than or equal to 70 dB; in the range of 2690-3800MHz, the suppression of the second filtering branch 13 is greater than or equal to 41 dB; the out-of-band rejection etc. of the second filter branch 13 can thus be improved.

As shown in fig. 6-7, fig. 6 is a schematic structural diagram of an embodiment of a third filtering branch of the filter provided in the present application; fig. 7 is a schematic structural diagram of an embodiment of a fourth filtering branch of the filter provided in the present application. The filter of the present embodiment is described on the basis of the above-described embodiments: the filter further comprises a third filter branch 14 and a fourth filter branch 15.

As shown in fig. 6, the third filtering branch 14 is disposed on the first side 111, the third filtering branch 14 and the first filtering branch 12 are disposed at an interval L1 along the first direction, so that a space is formed between the third filtering branch 14 and the first filtering branch 12 for disposing a support or a tap of a filter, so that the design of the filter is flexible, the third filtering branch 14 is composed of seven filtering cavities coupled in sequence, the seven filtering cavities of the third filtering branch 14 form three cross-coupling zeros, the seven filtering cavities of the third filtering branch 14 are a first filtering cavity C1, a second filtering cavity C2, a third filtering cavity C3, a fourth filtering cavity C4, a fifth filtering cavity C5, a sixth filtering cavity C6 and a seventh filtering cavity C7, and the first filtering cavity C1 to the fourth filtering cavity C4 of the third filtering branch 14 are divided into two columns 8292 arranged along the second direction L.

The projection of the fifth filter chamber C2 and the fourth filter chamber C2 of the third filter branch 14 in the first direction 21, the projection of the fifth filter chamber C2 and the fourth filter chamber C2 of the third filter branch 14 in the isosceles direction 2C 3 and the projection of the fifth filter chamber C2 and the fourth filter chamber C2 on the sixth filter chamber C72 are respectively located in the isosceles direction 2C 14, the projection of the fifth filter chamber C2 and the fourth filter chamber C2 of the third filter branch 14 in the isosceles direction 2C 1 is an obtuse angle a between the line connecting the center of the fifth filter chamber C2 and the center of the fourth filter chamber C2 of the third filter branch 14 and the line connecting the center of the third filter chamber C2 and the center of the fourth filter chamber C2, the angle a may be 105 ° -140 °, optionally the angle a may be 105 °, 110 °, 120 °, 130 ° or 140 °, the projection angle a between the fourth filter chamber C2 and the fourth filter chamber C72C 2C 72 of the third filter branch 14 and the projection of the fourth filter chamber 2C 72C 14 in the isosceles direction 2C 3, the projection of the fifth filter chamber 2C 14 and the projection of the fourth filter chamber 2C 14 in the fifth filter chamber 2C 3C and the fourth filter chamber 2C 3C 14C 3C and the fourth filter chamber C3C 14C 3C and the projection of the fourth filter branch and the.

As shown in fig. 6 and 8, fig. 8 is a schematic diagram of a topology of a third filtering branch provided in the present application. The first filter cavity C1 and the fourth filter cavity C4 of the third filter branch 14 are inductively cross-coupled, the second filter cavity C2 and the fourth filter cavity C4 of the third filter branch 14 and the fifth filter cavity C5 and the seventh filter cavity C7 are inductively cross-coupled, respectively, to form three cross-coupled zeros of the third filter branch 14, and the third filter branch 14 implements zero suppression by setting the three cross-coupled zeros, so that the third filter branch 14 meets the design requirements, and is convenient to debug.

As shown in fig. 7, the fourth filtering branch 15 is disposed on the second side 112 and is composed of five filtering cavities coupled in sequence, and the five filtering cavities of the fourth filtering branch 15 form two capacitive cross-coupling zeros; the five filter cavities of the fourth filter branch 15 are a first filter cavity D1, a second filter cavity D2, a third filter cavity D3, a fourth filter cavity D4 and a fifth filter cavity D5, the fourth filter branch 15 and the second filter branch 13 are symmetrically arranged, the fourth filter branch 15 and the second filter branch 13 can be produced through the same die, the generation efficiency is improved, the cost is reduced, and the consistency of the filter is improved.

The fourth filter cavity B4 and the fifth filter cavity B5 of the second filter branch 13, the fifth filter cavity D5 and the fourth filter cavity D4 of the fourth filter branch 15 are in a row and are sequentially arranged along the first direction L1, the third filter cavity B3, the second filter cavity B2 of the second filter branch 13, the second filter cavity D2 and the third filter cavity D3 of the fourth filter branch 15 are in a row and are sequentially arranged along the first direction L1, the first filter cavity B1 of the second filter branch 13, the first filter cavity D1 of the fourth filter branch 15 are in a row and are sequentially arranged along the first direction L1, and the second filter cavity D2 of the fourth filter branch 15 is respectively adjacent to the first filter cavity D1, the third filter cavity D3, the fifth filter cavity D5 and the second filter cavity B2 of the second filter branch 13.

As shown in fig. 7 and 9, fig. 9 is a schematic diagram of a topology of a fourth filtering branch provided in the present application. Capacitive cross coupling is respectively performed between the first filter cavity D1 and the third filter cavity D3 and between the third filter cavity D3 and the fifth filter cavity D5 of the fourth filter branch 15, so as to form two capacitive cross-coupling zeros of the fourth filter branch 15. The fourth filtering branch 15 realizes zero suppression by setting two capacitive cross-coupling zeros, so that the fourth filtering branch 15 meets the design requirements, and is convenient to debug.

The housing of this embodiment is further provided with a fifth port (not shown), a sixth port (not shown), a seventh port (not shown), and an eighth port (not shown), the first filter cavity C1 of the third filter branch 14 is connected to the fifth port, the seventh filter cavity C7 of the third filter branch 14 is connected to the sixth port, the first filter cavity D1 of the fourth filter branch 15 is connected to the seventh port, and the fifth filter cavity D5 of the fourth filter branch 15 is connected to the eighth port. The fifth port, the sixth port, the seventh port, and the eighth port are taps of the filter, the fifth port and the seventh port may be input ports, and the sixth port and the eighth port may be output ports.

In the third filtering branch 14, the coupling bandwidth between the fifth port and the first filtering cavity C1, the coupling bandwidth between the first filtering cavity C1 and the second filtering cavity C2, the coupling bandwidth between the first filtering cavity C1 and the fourth filtering cavity C4, the coupling bandwidth between the second filtering cavity C2 and the third filtering cavity C3, the coupling bandwidth between the second filtering cavity C2 and the fourth filtering cavity C4, the coupling bandwidth between the third filtering cavity C3 and the fourth filtering cavity C4, the coupling bandwidth between the fourth filtering cavity C4 and the fifth filtering cavity C5, the coupling bandwidth between the fifth filtering cavity C5 and the sixth filtering cavity C6, the coupling bandwidth between the fifth filtering cavity C5 and the seventh filtering cavity C7, the coupling bandwidth between the sixth filtering cavity C6 and the seventh filtering cavity C7, and the coupling bandwidth between the sixth filtering cavity C7 and the sixth filtering cavity C7, respectively, are as follows: 17MHz-23MHz, 13MHz-19MHz, 9MHz-15MHz, (-3) MHz-1MHz, (-1) MHz-3MHz, 8MHz-13MHz, 7MHz-12MHz, 5MHz-10MHz, 11MHz-17MHz, 17MHz-23 MHz.

The resonant frequencies of the first filter cavity C1 through the seventh filter cavity C7 of the third filter branch 14 are sequentially in the following ranges: 1866MHz to 1868MHz, 1868MHz to 1871MHz, 1868MHz to 1870MHz, 1866MHz to 1868MHz, 1872MHz to 1874MHz, and 1866MHz to 1868 MHz. Therefore, the bandwidth of the third filtering branch 14 of this embodiment is located in the range of 1857-1880MHz, and the bandwidth of the third filtering branch 14 can be accurately controlled, so as to meet the design requirement of the filter.

The simulated bandwidth of the third filtering branch 14 in this embodiment is as shown in the frequency band curve 51 in fig. 5, and it can be obtained that the simulated bandwidth of the third filtering branch 14 is located in the range of 1857-1880MHz, which meets the design requirement of the filter and can accurately control the bandwidth of the third filtering branch 14.

In the frequency band range of 9kHz-1626.5MHz, the inhibition of the third filtering branch 14 is greater than or equal to 100 dB; the rejection of the third filter branch 14 is greater than or equal to 111dB in the 1626.5-1660.5MHz frequency band; in the frequency band range of 1660.5-1710MHz, the suppression of the third filtering branch 14 is greater than or equal to 100 dB; in the range of 1710-1780MHz, the rejection of the third filtering branch 14 is greater than or equal to 110 dB; in the 1780-1785MHz frequency band range, the rejection of the third filtering branch 14 is greater than or equal to 105 dB; in the 1785-1795MHz frequency band range, the suppression of the third filtering branch 14 is greater than or equal to 25 dB; in the frequency band range of 1795-1850MHz, the suppression of the third filtering branch 14 is greater than or equal to 25 dB; in the range of the 1885-1920MHz band, the rejection of the third filtering branch 14 is greater than or equal to 48 dB; in the frequency band range of 1920-1925MHz, the rejection of the third filtering branch 14 is greater than or equal to 83 dB; in the range of 1925-1980MHz, the rejection of the third filtering branch 14 is greater than or equal to 88 dB; in the range of 1980-2025MHz, the rejection of the third filtering branch 14 is greater than or equal to 111 dB; in the range of 2025 and 2400MHz, the rejection of the third filtering branch 14 is greater than or equal to 80 dB; within the range of 2400-3800MHz, the rejection of the third filtering branch 14 is greater than or equal to 70 dB; in the frequency range of 3800-5640MHz, the rejection of the third filtering branch 14 is greater than or equal to 20 dB; within the range of the frequency band of 7220-7520MHz, the rejection of the third filtering branch 14 is greater than or equal to 26 dB; in the range of the 9025-9400MHz frequency band, the suppression of the third filtering branch 14 is greater than or equal to 26 dB; within the frequency range of 10830-11280MHz, the rejection of the third filtering branch 14 is greater than or equal to 15 dB; the out-of-band rejection etc. of the third filter branch 14 can be improved.

In the fourth filtering branch 15, the coupling bandwidth between the seventh port and the first filtering cavity D1, the coupling bandwidth between the first filtering cavity D1 and the second filtering cavity D2, the coupling bandwidth between the first filtering cavity D1 and the third filtering cavity D3, the coupling bandwidth between the second filtering cavity D2 and the third filtering cavity D3, the coupling bandwidth between the third filtering cavity D3 and the fourth filtering cavity D4, the coupling bandwidth between the third filtering cavity D3 and the fifth filtering cavity D5, the coupling bandwidth between the fourth filtering cavity D4 and the fifth filtering cavity D5, and the coupling bandwidth between the fifth filtering cavity D5 and the eighth port are respectively in the following ranges:

20MHz-27MHz, 15MHz-22MHz, 0MHz-5MHz, 10MHz-16MHz, 2MHz-7MHz, 15MHz-21MHz, and 20MHz-27 MHz.

The resonant frequencies of the first filter cavity D1 to the fifth filter cavity D5 of the fourth filter branch 15 are sequentially in the following ranges: 1771MHz to 1773MHz, 1773MHz to 1775MHz, 1771MHz to 1773MHz, 1774MHz to 1776MHz and 1771MHz to 1773 MHz. Therefore, the bandwidth of the fourth filtering branch 15 in this embodiment is located in the range of 1761-.

The simulated bandwidth of the fourth filtering branch 15 in this embodiment is as shown in the frequency band curve 52 in fig. 5, and it can be obtained that the simulated bandwidth of the fourth filtering branch 15 is within the range of 1761-1785MHz, which meets the design requirement of the filter, and can accurately control the bandwidth of the fourth filtering branch 15.

In the frequency band range of 9kHz-1420MHz, the suppression of the fourth filtering branch 15 is greater than or equal to 85 dB; within the frequency band range of 1420-; in the frequency range of 1670-1690MHz, the suppression of the fourth filtering branch 15 is greater than or equal to 25 dB; within the frequency range of 1690 and 1745MHz, the suppression of the fourth filtering branch 15 is greater than or equal to 25 dB; in the range of 1795-1805MHz frequency band, the suppression of the fourth filtering branch 15 is greater than or equal to 30 dB; within the frequency range of 1805-1830MHz, the suppression of the fourth filtering branch 15 is greater than or equal to 75 dB; in the 1830-1880MHz frequency band range, the suppression of the fourth filtering branch 15 is greater than or equal to 85 dB; in the range of 1880-2690MHz, the suppression of the fourth filtering branch 15 is greater than or equal to 70 dB; in the range of 2690-3800MHz, the suppression of the fourth filtering branch 15 is greater than or equal to 41 dB; the out-of-band rejection etc. of the fourth filtering branch 15 can thus be improved.

The first filtering branch 12 and the third filtering branch 14 can be both transmitting filtering branches, and the second filtering branch 13 and the fourth filtering branch 15 can be receiving filtering branches.

The present application further provides a communication device, as shown in fig. 10, fig. 10 is a schematic structural diagram of an embodiment of the communication device provided in the present application. The communication device of the present embodiment includes an antenna 62 and a radio frequency unit 61. The antenna 62 and the radio frequency unit 61 can be installed on a base station, and can also be installed on objects such as a street lamp; the antenna 62 is connected to a radio unit (RRU) 61. The radio frequency unit 61 comprises the filter disclosed in the above embodiments for filtering the radio frequency signal.

In other embodiments, the rf Unit 61 may be integrated with the Antenna 62 to form an Active Antenna Unit (AAU).

It should be noted that some embodiments of the present application refer to the present application as a filter, and may also be referred to as a combiner, that is, a dual-band combiner, and may also be referred to as a duplexer in other embodiments.

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 first filtering branch is arranged on the first side of the shell and consists of seven filtering cavities which are sequentially coupled, and the seven filtering cavities of the first filtering branch further form three cross-coupling zeros;

the second filtering branch is arranged on the second side of the shell and consists of five filtering cavities which are sequentially coupled, and the five filtering cavities of the second filtering branch further form two capacitive cross-coupling zeros;

seven filter cavities of the first filter branch are divided into three rows arranged along the second direction, and five filter cavities of the second filter branch are divided into three rows arranged along the second direction.

2. The filter of claim 1,

the seventh filtering cavity, the sixth filtering cavity and the fifth filtering cavity of the first filtering branch are in a row and are sequentially arranged along the first direction;

the third filtering cavities and the fourth filtering cavities of the first filtering branch are in a row and are sequentially arranged along the first direction;

the second filtering cavities and the first filtering cavities of the first filtering branch are in a row and are sequentially arranged along the first direction;

the third filtering cavity of the first filtering branch is respectively adjacent to the first filtering cavity, the second filtering cavity, the fourth filtering cavity, the sixth filtering cavity and the seventh filtering cavity;

and the fifth filter cavity of the first filter branch is respectively adjacent to the fourth filter cavity and the sixth filter cavity.

3. The filter of claim 2,

the fourth filtering cavities and the fifth filtering cavities of the second filtering branch are in a row and are sequentially arranged along the first direction;

the third filtering cavities and the second filtering cavities of the second filtering branch are in a row and are sequentially arranged along the first direction;

the first filtering cavities of the second filtering branch are in a row;

and a third filtering cavity of the second filtering branch is respectively adjacent to the first filtering cavity, the second filtering cavity, the fourth filtering cavity and the fifth filtering cavity.

4. The filter of claim 3,

capacitive cross coupling is respectively performed between a first filtering cavity and a third filtering cavity of the first filtering branch and between a fourth filtering cavity and a sixth filtering cavity of the first filtering branch, and the first filtering cavity and the fourth filtering cavity of the first filtering branch are inductively cross coupled to form three cross coupling zeros of the first filtering branch;

capacitive cross coupling is respectively performed between the first filtering cavity and the third filtering cavity of the second filtering branch circuit and between the third filtering cavity and the fifth filtering cavity of the second filtering branch circuit, so that two capacitive cross coupling zeros of the second filtering branch circuit are formed.

5. The filter according to any one of claims 1 to 4,

the bandwidth of the first filtering branch is located in the range of 1857-1880 MHz;

the bandwidth of the second filtering branch is within the range of 1761-1785 MHz.

6. The filter of claim 5,

the filter also comprises a third filtering branch and a fourth filtering branch;

the third filtering branch and the first filtering branch are arranged at intervals along the first direction and are composed of seven filtering cavities which are sequentially coupled, and the seven filtering cavities of the third filtering branch further form three cross-coupling zeros;

the fourth filtering branch and the second filtering branch are symmetrically arranged;

and the first filtering cavity to the fourth filtering cavity of the third filtering branch circuit are divided into two rows arranged along the second direction.

7. The filter of claim 6,

the second filtering cavities and the first filtering cavities of the third filtering branch are in a row and are arranged along the first direction;

the third filtering cavities and the fourth filtering cavities of the third filtering branch are in a row and are arranged along the first direction;

a fifth filter cavity of the third filter branch is far away from a middle branching line of the shell in the first direction relative to a fourth filter cavity, and an included angle between a connecting line of the center of the fifth filter cavity of the third filter branch and the center of the fourth filter cavity and a connecting line of the center of the third filter cavity and the center of the fourth filter cavity is an obtuse angle;

a projection of the center of a fifth filter cavity of the third filter branch in the first direction is positioned between the projection of the center of the fourth filter cavity of the third filter branch and the projection of the center of the sixth filter cavity in the first direction; the projection of the sixth filter cavity center of the third filter branch in the second direction is located between the projection of the fourth filter cavity center and the projection of the fifth filter cavity center of the third filter branch in the second direction;

a seventh filter cavity of the third filter branch is respectively adjacent to the fifth filter cavity and the sixth filter cavity;

and a fourth filtering cavity of the third filtering branch is respectively adjacent to the first filtering cavity, the second filtering cavity, the third filtering cavity and the fifth filtering cavity.

8. The filter of claim 7,

and a second filter cavity of the fourth filter branch is adjacent to a second filter cavity of the second filter branch.

9. The filter of claim 8,

the first filter cavity and the fourth filter cavity of the third filter branch are inductively cross-coupled, the second filter cavity and the fourth filter cavity of the third filter branch and the fifth filter cavity and the seventh filter cavity of the third filter branch are inductively cross-coupled respectively to form three cross-coupled zeros of the third filter branch, and the bandwidth of the third filter branch is within the range of 1857 and 1880 MHz;

inductive cross coupling is respectively performed between the first filtering cavity and the third filtering cavity of the fourth filtering branch circuit and between the third filtering cavity and the fifth filtering cavity of the fourth filtering branch circuit; the bandwidth of the second filtering branch is within the range of 1761-1785 MHz.

10. A communication device, characterized in that the communication device comprises an antenna and a radio frequency unit connected to the antenna, the radio frequency unit comprising a filter according to any of claims 1-9 for filtering radio frequency signals.

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