CN216354695U - Filter and communication device - Google Patents

Abstract

The application discloses wave filter and communication device, the wave filter includes: the filter comprises a shell, a common filter cavity, a first filter path and a second filter path, wherein the first filter path consists of five filter cavities which are coupled in sequence, and the five filter cavities of the first filter path form two capacitive cross-coupling zeros; the second filtering channel consists of six filtering cavities which are coupled in sequence, and the six filtering cavities of the second filtering channel form two inductive cross-coupling zeros; and the first filter cavity of the first filter path and the first filter cavity of the second filter path are respectively coupled with the common filter cavity. This application realizes the way through two different filtering path and in the time of, the first filtering path that has five filtering chambeies forms two capacitive cross coupling zeros to the stop band rejection performance of reinforcing filter at the passband low side, the second filtering path that has six filtering chambers forms two perceptual cross coupling zeros, with the stop band rejection performance of reinforcing filter at the passband high side.

Description

Filter and communication device

Technical Field

The present application relates to the field of communications technologies, and in particular, to a filter and a communications apparatus.

Background

The signal received by the communication device includes not only the communication signal carrying the communication data within the particular frequency range, but also a number of spurious or interfering signals outside the particular frequency range. To ensure that the communication signal carrying the communication data within the specific frequency range is obtained, the signal received by the receiving antenna needs to be filtered by a filter, so as to filter out the noise or interference signals outside the specific frequency of the communication signal carrying the communication data.

In the existing filter, a plurality of filter cavities are usually adopted to form a filter branch to ensure out-of-band rejection, but a single-channel filter with only one filter branch cannot meet the requirement, and when a multi-channel filter is adopted, the stop band rejection performance of the filter is poor, which is a problem that needs to be solved urgently by technical personnel in the field.

SUMMERY OF THE UTILITY MODEL

The application aims to provide a filter and a communication device, when two different filtering paths are combined, a first filtering path with five filtering cavities forms two capacitive cross coupling zero points so as to enhance the stop band rejection performance of the filter at the low end of a pass band, and a second filtering path with six filtering cavities forms two inductive cross coupling zero points so as to enhance the stop band rejection performance of the filter at the high end of the pass band.

The application discloses a filter, the filter includes: the filter comprises a shell, a common filter cavity, a first filter path and a second filter path, wherein the common filter cavity is arranged on the shell; the first filtering channel is arranged on the shell and consists of five filtering cavities which are sequentially coupled, and the five filtering cavities of the first filtering channel form two capacitive cross-coupling zeros; the second filtering path is arranged on the shell and consists of six filtering cavities which are sequentially coupled, and the six filtering cavities of the second filtering path form two inductive cross-coupling zeros; the filter also comprises an output port, a first input end and a second input end, and the output port is connected with the common filter cavity; the first input end is connected with a fifth filter cavity of the first filter path; the second input end is connected with a sixth filtering cavity of the second filtering path; and the first filter cavity of the first filter path and the first filter cavity of the second filter path are respectively coupled with the common filter cavity.

Optionally, the housing has a first direction and a second direction, the second direction being perpendicular to the first direction; a first filtering cavity, a second filtering cavity, a third filtering cavity, a fourth filtering cavity and a fifth filtering cavity of the first filtering channel are sequentially arranged in a row along the first direction; the first filtering cavity, the second filtering cavity, the third filtering cavity, the fourth filtering cavity, the fifth filtering cavity and the sixth filtering cavity of the second filtering channel are sequentially arranged in a row along the first direction; and the first filtering cavity of the second filtering channel is arranged corresponding to the public filtering cavity, and the first filtering cavity, the second filtering cavity, the third filtering cavity, the fourth filtering cavity and the fifth filtering cavity in the first filtering channel are respectively arranged corresponding to the second filtering cavity, the third filtering cavity, the fourth filtering cavity, the fifth filtering cavity and the sixth filtering cavity in the second filtering channel.

Optionally, the first filter cavity, the second filter cavity, the third filter cavity and the fourth filter cavity of the first filter path are arranged in a parallelogram; the first filtering cavity, the second filtering cavity, the third filtering cavity and the fourth filtering cavity of the second filtering channel are arranged in a parallelogram shape; the fourth filtering cavity and the fifth filtering cavity of the first filtering channel and the fifth filtering cavity and the sixth filtering cavity of the second filtering channel are arranged in a parallelogram shape.

Optionally, capacitive coupling pieces are arranged between the first filtering cavity and the third filtering cavity of the first filtering path, and between the third filtering cavity and the fifth filtering cavity; the working frequency band of the first filtering channel is 880MHz-960 MHz; inductive coupling pieces are arranged between the first filtering cavity and the third filtering cavity of the second filtering path and between the fourth filtering cavity and the sixth filtering cavity of the second filtering path, and flying rods are arranged between the third filtering cavity and the fifth filtering cavity of the second filtering path; the working frequency band of the second filtering path is 690MHz-862 MHz.

Optionally, the flying bar includes a first coupling portion, a second coupling portion and a connecting seat, and two sides of the connecting seat are connected with the first coupling portion and the second coupling portion respectively; a window is arranged between a third filtering cavity and a fifth filtering cavity of the second filtering channel, and the flying rod is arranged in the window.

Optionally, each filter cavity is provided with a resonance rod and a tuning rod; the resonance rod comprises a cavity wall and an inner cavity formed by the cavity wall; one end of the tuning rod is arranged in the inner cavity; the resonance rod is made of 316 steel, and the tuning rod is made of copper; the cavity wall comprises a bottom wall and a side wall, two ends of the side wall bend and extend in a direction away from the inner cavity so as to form flanging structures at two ends of the side wall, and the flanging structures are arranged in parallel with the bottom wall; the flanging structure comprises a vertical part and a horizontal part, one end of the horizontal part is connected with the side wall, the other end of the horizontal part is connected with the vertical part, the vertical part is arranged in parallel with the side wall, a chamfer structure is arranged at the joint of the horizontal part and the side wall, and the chamfer structure is a round chamfer.

Optionally, the resonant rod in the common filter cavity comprises a first vertical part and a first horizontal part, the length of the first horizontal part ranges between 5.9 mm and 6 mm, and the length of the first vertical part ranges between 6.95 mm and 7.05 mm; the resonant bar in the filter cavity of the first filter path includes a second vertical section and a second horizontal section, the second horizontal section having a length in a range of 4.1 mm to 4.2 mm, the second vertical section having a length in a range of 1.45 mm to 1.55 mm; the resonance bar in the filter cavity of the second filter path includes a third vertical portion having a length ranging between 8.45 mm and 8.55 mm and a third horizontal portion having a length ranging between 7.7 mm and 7.8 mm.

Optionally, the filter further includes a metal sleeve, a dielectric sleeve, a tap rod and a connector, the first vertical portion is provided with a first through hole, and the metal sleeve passes through the first through hole and is fixedly connected with the first through hole; one end of the tap rod is inserted into the metal sleeve, the other end of the tap rod is connected with the connector, the medium sleeve is sleeved between the metal sleeve and the tap rod, and the medium sleeve is made of an insulating material.

The application also discloses a communication device, the communication device include the antenna and with the radio frequency unit that the antenna is connected, the radio frequency unit includes foretell the wave filter for carry out the filtering to radio frequency signal.

The filter is designed into two filtering paths and a common filtering cavity, the two filtering paths are simultaneously connected by using the common filtering cavity, the function of a combiner is realized, and the low-end rejection of the bandwidth of the filtering paths can be well controlled through two capacitive cross-coupling zero points formed by the five filtering cavities of the first filtering path, so that the good low-end rejection of the bandwidth is obtained; two inductive cross-coupling zero points formed by six filter cavities in the second filter path can well control the high-end suppression of the bandwidth of the filter path, so that the filter paths with two different bandwidths can realize multi-channel filtering, have strong anti-interference capability and ensure that a communication system is not interfered by stray signals.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:

fig. 1 is a schematic structural diagram of a filter according to an embodiment of the present application;

FIG. 2 is a schematic diagram of a topology of a first filter path according to an embodiment of the present application;

FIG. 3 is a schematic diagram of a topology of a second filter path according to an embodiment of the present application;

FIG. 4 is a combined topology diagram of a first filtering path and a second filtering path according to an embodiment of the present application;

FIG. 5 is a schematic diagram of a first filter path and second filter path combining circuit according to an embodiment of the present application;

FIG. 6 is a waveform diagram of a first filter path and second filter path combined circuit parameter response according to an embodiment of the present application;

fig. 7 is a schematic diagram of a partial filter cavity of a filter according to an embodiment of the present application:

FIG. 8 is a schematic structural diagram of a filter cavity according to an embodiment of the present disclosure;

FIG. 9 is a cross-sectional view of a resonating bar in a second filter path in accordance with an embodiment of the present application;

FIG. 10 is a cross-sectional view of a resonating bar in a first filter path according to an embodiment of the present application;

FIG. 11 is a cross-sectional view of a resonating rod in a common filter cavity in accordance with an embodiment of the present application;

FIG. 12 is a schematic diagram of a resonant rod in a common filter cavity according to an embodiment of the present application;

FIG. 13 is a schematic diagram of a tap rod coupled to a common filter cavity according to an embodiment of the present application;

fig. 14 is a schematic structural diagram of a communication device according to an embodiment of the present application.

10, a communication device; 100. a filter; 200. an antenna; 300. a radio frequency unit; 110. a housing; 120. a first filtering path; 130. a second filtering path; n1, common filter cavity; 140. an output port; 150. a first input terminal; 160. a second input terminal; d1, first direction; d2, second direction; 161. a capacitive coupling tab; 162. an inductive coupling patch; 170. A flying bar; 171. a first coupling part; 172. a second coupling part; 173. a connecting seat; 180. a window; 190. a filter cavity; 191. a resonant rod; 192. a tuning rod; 193. a chamber wall; 1931. a side wall; 1932. a bottom wall; 194. an inner cavity; 195. a flanging structure; 1951. a vertical portion; 1952. a horizontal portion; 196. a metal coupling rib; 199. a chamfering structure; 400. a connector; 410. a metal sleeve; 420. a dielectric sleeve; 430. a tap rod; 441. a first through hole; 197. fixing a column; 198. a fixing hole; 1953. a first vertical portion; 1954. a first horizontal portion; 1955. a second vertical portion; 1956. a second horizontal portion; 1957. a third vertical portion; 1958. a third horizontal portion.

Detailed Description

It is to be understood that the terminology, the specific structural and functional details disclosed herein are for the purpose of describing particular embodiments only, and are representative, but that the present application may be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.

In the description of the present application, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating relative importance or as implicitly indicating the number of technical features indicated. Thus, unless otherwise specified, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; "plurality" means two or more. The terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that one or more other features, integers, steps, operations, elements, components, and/or combinations thereof may be present or added.

Further, terms of orientation or positional relationship indicated by "center", "lateral", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, are described based on the orientation or relative positional relationship shown in the drawings, are simply for convenience of description of the present application, and do not indicate that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application.

Furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, fixed connections, removable connections, and integral connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through both elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

The present application is described in detail below with reference to the figures and alternative embodiments.

Fig. 1 is a schematic structural diagram of a filter according to an embodiment of the present application, and as shown in fig. 1, the present application discloses a filter, where the filter 100 includes: a housing 110, a common filter cavity N1, a first filter path 120, and a second filter path 130, the common filter cavity N1 being disposed on the housing 110; the first filtering path 120 is arranged on the housing 110 and is composed of five filtering cavities 190 coupled in sequence, and the five filtering cavities 190 of the first filtering path 120 form two capacitive cross-coupling zeros; the second filtering path 130 is arranged on the housing 110 and is composed of six filtering cavities 190 coupled in sequence, and the six filtering cavities 190 of the second filtering path 130 form two inductive cross-coupling zeros; wherein, the first filter cavity a1 of the first filter path 120 and the first filter cavity B1 of the second filter path 130 are respectively coupled with the common filter cavity N1.

The filter is a communication device for frequency selection and signal suppression, and the filter cavity of the filter mainly plays a role in frequency control, and the filter cavity is required by the communication device related to frequency transmission and reception.

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.

According to the combiner, the filter 100 is designed into two filter paths, namely a first filter path 120, a second filter path 130 and a common filter cavity N1, the first filter path 120 and the second filter path 130 are simultaneously connected through the common filter cavity N1, so that the function of the combiner is realized, five-order two transmission zeros are formed through five filter cavities 190 of the first filter path 120, and six-order two transmission zeros are formed through six filter cavities 190 of the second filter path 130, wherein two capacitive cross coupling zeros formed by the first filter path 120 can well control the low-end suppression of the bandwidth of the first filter path 120, and better bandwidth low-end suppression is obtained; two inductive cross-coupling zeros formed in the second filtering path 130 can well control the high-end rejection of the bandwidth of the second filtering path 130, so that the two filtering paths with different bandwidths have strong anti-interference capability while realizing multi-channel filtering, and a communication system is ensured not to be interfered by stray signals.

Furthermore, the filter 100 further includes: an output port 140, a first input 150 and a second input 160, the output port 140 being connected to a common filter cavity N1; the first input 150 is connected to the fifth filter cavity a5 of the first filter path 120; the second input 160 is connected to the sixth filter cavity B6 of the second filter path 130.

Specifically, as shown in fig. 1, the housing 110 has a first direction D1 and a second direction D2, the second direction D2 being perpendicular to the first direction D1; the second filter cavity a2, the third filter cavity A3, the fourth filter cavity a4 and the fifth filter cavity a5 of the first filter path 120 are arranged in a row in sequence along the first direction D1; the first filter cavity B1, the second filter cavity B2, the third filter cavity B3, the fourth filter cavity B4, the fifth filter cavity B5 and the sixth filter cavity B6 of the second filter passage 130 are sequentially arranged in a row along the first direction D1; the first filtering cavity B1 of the second filtering path 130 is arranged corresponding to the common filtering cavity N1, and the first filtering cavity a1, the second filtering cavity a2, the third filtering cavity A3, the fourth filtering cavity a4 and the fifth filtering cavity a5 of the first filtering path 120 are respectively arranged corresponding to the second filtering cavity B2, the third filtering cavity B3, the fourth filtering cavity B4, the fifth filtering cavity B5 and the sixth filtering cavity B6 of the second filtering path 130.

Because this application has adopted two filtering paths to form wave filter 100, the filtering chamber 190 in wave filter 100 is in a great number, consequently has carried out the design of arranging to filtering chamber 190 on two filtering paths, specifically arranges as follows:

the first filter cavity a1, the second filter cavity a2, the third filter cavity A3 and the fourth filter cavity a4 of the first filter passage 120 are arranged in a parallelogram; the first filter cavity B1, the second filter cavity B2, the third filter cavity B3 and the fourth filter cavity B4 of the second filter passage 130 are arranged in a parallelogram; the fourth filter cavity A4 and the fifth filter cavity A5 of the first filter passage 120 and the fifth filter cavity A5 and the sixth filter cavity A6 of the second filter passage 130 are arranged in a parallelogram.

By adopting the above arrangement for the filter cavities 190 in the first filter path 120 and the second filter path 130, the size of the filter paths is reduced, the signal transmission path is simplified, the size of the filter 100 is reduced, the signal transmission of the filter 100 is not affected, and the performance of the filter 100 is enhanced.

In this embodiment, as shown in fig. 1, metal coupling ribs 196 are disposed between the common filter cavity N1 and the first filter cavity a1 of the first filter path 120, and between the first filter cavity a1 and the second filter cavity a2 of the first filter path 120; metal coupling ribs 196 are arranged between the common filter cavity N1 and the first filter cavity B1 of the second filter channel 130, between the first filter cavity B1 and the second filter cavity B2 of the second filter channel 130, between the second filter cavity B2 and the third filter cavity B3, between the third filter cavity B3 and the fourth filter cavity B4, between the fourth filter cavity B4 and the fifth filter cavity B5, and between the fifth filter cavity B5 and the sixth filter cavity B6. By arranging the metal coupling rib 196, the coupling strength between two adjacent filter cavities 190 on the coupling path is improved, so that the coupling quality of energy transmission is improved.

Fig. 2 is a schematic topology diagram of a first filter path according to an embodiment of the present application, and as shown in fig. 2 in combination with fig. 1, a capacitive coupling plate 161 is disposed between a first filter cavity a1 and a third filter cavity A3 of the first filter path 120, and between a third filter cavity A3 and a fifth filter cavity a 5; the operating frequency band of the first filtering path 120 is 880MHz-960 MHz.

In this embodiment, capacitive cross coupling is adopted between the first filter cavity a1 and the third filter cavity A3, and between the third filter cavity A3 and the fifth filter cavity a5 of the first filter channel 120 in the first filter channel 120, so that 2 transmission zeros are generated at the low end of the pass band, and the low-end suppression of the bandwidth of the first filter channel 120 can be well controlled; in addition, the operating frequency range of the first filtering path 120 is 880MHz-960MHz, which can accurately control the bandwidth of the filtering path.

Fig. 3 is a schematic diagram of a topology structure of a second filter path according to an embodiment of the present disclosure, and as shown in fig. 3 and fig. 1, an inductive coupling sheet 162 is disposed between a first filter cavity B1 and a third filter cavity B3, between a fourth filter cavity B4 and a sixth filter cavity B6 of the second filter path 130, and a flying rod 170 is disposed between a third filter cavity B3 and a fifth filter cavity B5 of the second filter path 120; the operating frequency band of the second filter path 130 is 690MHz-862 MHz.

Inductive cross coupling is respectively performed between the first filter cavity B1 and the third filter cavity B3, between the fourth filter cavity B4 and between the sixth filter cavity B6 of the second filter path 130; two inductive coupling zeros are formed, so that the high-end rejection of the bandwidth of the filter 100 can be well controlled, and better high-end rejection of the bandwidth is obtained, and therefore, the stop band rejection performance of the filter 100 can be improved;

meanwhile, in order to reduce the influence of the parasitic coupling on the filter 100, the flying bar 170 is added between the third filter cavity A3 and the fifth filter cavity a5 of the second filter path 130, so that the parasitic inductive coupling and the increased capacitive coupling are mutually offset, and the index change problem caused by the parasitic coupling is solved. In addition, the working frequency range of the second filtering path 130 is 690MHz-862MHz, which can accurately control the bandwidth of the filtering path.

Fig. 4 is a combined topology diagram of a first filtering path and a second filtering path according to an embodiment of the present application, fig. 5 is a schematic diagram of an equivalent combined circuit of the first filtering path and the second filtering path according to the embodiment of the present application, fig. 4 and fig. 5 show that different filters have different coupling relationships and can be converted into equivalent resistors, and 120 in the first filtering path has a main coupling relationship between a1 and a5 and is equivalent to a first resistor R1; capacitive cross-coupling is achieved between the first filter cavity a1 and the third filter cavity A3, and between the third filter cavity A3 and the fifth filter cavity a5 of the first filter path 120, and the coupling is equivalent to a second resistor R2.

The second filter path 130 has a main coupling relationship between B1 and B6, and is equivalent to a third resistor R3; the inductive cross coupling between the first filter cavity B1 and the third filter cavity B3, between the fourth filter cavity B4 and between the sixth filter cavity B6 of the second filter path 130 is equivalent to a fourth resistor R4, and the inductive coupling between the third filter cavity B3 and the fifth filter cavity B5 of the second filter path 130 is equivalent to a fifth resistor R5.

The impedances Z2 and Z3 at the first and second inputs 150 and 160 are about 50 ohms, and the impedance Z1 at the input port 140 is about 50 ohms; in order to ensure the transmission of electromagnetic signals between the filter cavities 190 of the filter 10, it is necessary to provide impedance adjusters Z11 between the input port 140 and the first filter cavity a1 of the first filter path 120, between adjacent filter cavities 190 on the coupling path, between non-cascaded filter cavities 190 forming cross-coupling, and between the fifth filter cavity a5 and the first input terminal 150,

impedance adjusters Z21 are respectively provided between the input port 140 and the first filter cavity B1 of the second filter path 130, between adjacent filter cavities 190 on the coupling path, between the non-cascaded filter cavities 190 forming the cross coupling, and between the sixth filter cavity B6 and the second input terminal 160, to achieve impedance matching.

FIG. 6 is a waveform diagram of a first filter path and second filter path combined circuit parameter response of an embodiment of the present application; as can be seen from fig. 6, the suppression of the frequency point 862.0MHZ (m2) is-36.398 dB, the suppression of the frequency point 690.0MHZ (m1) is-26.274 dB, the suppression of the frequency point 960.0MHZ (m4) is-23.727 dB, the suppression of the frequency point 880.0MHZ (m3) is-30.524 dB, the suppression of the frequency point 862.0MHZ (m6) is-55.376, and the suppression of the frequency point 880.0MHZ (m5) is-56.387, so that the design requirement of the out-of-band suppression of the filter 10 can be satisfied.

Fig. 7 is a schematic diagram of a filter cavity of a filter according to an embodiment of the present invention, as shown in fig. 7 and fig. 1, the flying bar 170 includes a first coupling portion 171, a second coupling portion 172, and a connecting seat 173, and two sides of the connecting seat 173 are respectively connected to the first coupling portion 171 and the second coupling portion 172; be provided with window 180 between the third filter chamber B3 of second filter route 130 and the fifth filter chamber B5, fly pole 170 sets up in window 180, and the first coupling portion and the second coupling portion of fly pole can be the metal coupling probe in this application, form the fly pole in the both sides of connecting seat through the metal coupling probe connection, and the connecting seat is made for insulating material.

Taking the second filter path 130 as an example, the first coupling part 171 is coupled to the resonant rod in the third filter cavity B3 in the second filter path 120, so that a coupling capacitance is formed between the first coupling part 171 and the resonant rod 191 in the third filter cavity B3, the second coupling part 172 is coupled to the resonant rod 191 in the fifth filter cavity B5, and a coupling capacitance is formed between the second coupling part 172 and the resonant rod 191 in the fifth filter cavity B5 in the second filter path.

Fig. 8 is a schematic structural view of filter cavities according to an embodiment of the present application, and as shown in fig. 8, each filter cavity 190 is provided with a resonance rod 191 and a tuning rod 192; resonant rod 191 includes a cavity wall 193 and an inner cavity 194 formed by cavity wall 193; one end of the tuning rod 192 is disposed within the inner cavity 194; the resonance rod 191 is made of 316 steel, and the tuning rod 192 is made of copper; the cavity wall 193 includes a bottom wall 1932 and a side wall 1931, two ends of the side wall 1931 bend and extend in a direction away from the inner cavity 194, so as to form flange structures 195 at two ends of the side wall 1931, and the flange structures 195 are arranged in parallel with the bottom wall 1932; the flange structure 195 includes a vertical portion 1951 and a horizontal portion 1952, one end of the horizontal portion 1952 is connected to the sidewall 1931, the other end is connected to the vertical portion 1951, and the vertical portion 1951 is parallel to the sidewall 1931, so that the capacitance can be effectively increased and the frequency can be reduced in the space defined by the filter cavity 190, that is, the volume of the tuning rod 192 and the resonance rod 191 can be effectively reduced under the condition that the requirement of the working frequency band is met, and the volume of the filter cavity 190 and even the entire filter 100 can be further reduced.

The horizontal portion 1952 is provided with a chamfer structure 199 at the junction with the side wall 1931, the chamfer structure being a round chamfer, the radius of the chamfer structure being 0.9 mm.

In the actual production process, sharp edges are easily formed at the connection part of the side wall 1931 and the horizontal part 1952, so that the power is not controlled well; receive the electric field too big, can produce the phenomenon of discharging, influence the filtering effect, consequently set up chamfer structure 199 in the junction of horizontal part 1952 and lateral wall 1931 to adopt the round chamfer to round sharp-edged rounding off, avoid appearing the phenomenon of discharging, increase the stability of filter chamber.

Each filter cavity 190 is further provided with a fixing column 197, a fixing hole 198 is formed in the position, corresponding to the fixing column 197, of the bottom wall 1932, and the cavity wall 193 is fixed on the fixing column 197 through the fixing hole 198. This provides the resonant rod 191 with better stability. At the same time, the performance of the filter cavity 190 is adjusted by adjusting the distance the tuning rod 192 extends into the internal cavity 194.

The five filter cavities 190 in the first filter path 120 and the six filter cavities 190 in the second filter path 130 have the same size, and the size of the filter cavities 190 is smaller than phi 30 x 18mm, so that the production is convenient, and the cost is saved. The six filter cavities 190 in the first filter path 120 and the six filter cavities 190 in the second filter path 130 of the present embodiment may be metal filter cavities, and the resonant rod 191 may be a metal resonant rod 191.

FIG. 9 is a cross-sectional view of a resonating bar in a second filtering path in accordance with an embodiment of the present application; FIG. 10 is a cross-sectional view of a resonant bar in a first filter path in accordance with an embodiment of the present application; FIG. 11 is a schematic cross-sectional view of a resonating bar in a common filter cavity in accordance with an embodiment of the present application; as shown in fig. 9 to 11, the resonance bar 191 in the common filter chamber N1 includes a first vertical portion 1953 and a first horizontal portion 1954, the first horizontal portion 1954 having a length ranging between 5.9 mm and 6 mm, the first vertical portion 1953 having a length ranging between 6.95 mm and 7.05 mm; the resonant bar 191 in the filter cavity 190 of the first filter path 120 includes a second vertical portion 1955 and a second horizontal portion 1956, the second horizontal portion 1956 having a length ranging between 4.1 mm and 4.2 mm, the second vertical portion 1955 having a length ranging between 1.45 mm and 1.55 mm; the resonant rod 191 in the filter cavity 190 of the second filter path 130 includes a third vertical portion 1957 and a third horizontal portion 1958, the third vertical portion 1957 having a length ranging between 8.45 mm and 8.55 mm, and the third horizontal portion 1958 having a length ranging between 7.7 mm and 7.8 mm. By adopting the above-mentioned size design for the resonant rod 191 in the common filter cavity N1, the resonant rod 191 in the first filter path 120 and the resonant rod 191 in the second filter path 130, the structure of the whole filter 100 can be more compact, and a better signal transmission effect can be achieved.

FIG. 12 is a schematic structural diagram of a resonant rod in a common filter cavity according to an embodiment of the present application, and FIG. 13 is a schematic structural diagram of a tap rod according to an embodiment of the present application connected to the common filter cavity; the filter 100 further comprises a metal sleeve 410, a dielectric sleeve 420, a tap rod 430 and a connector 400, wherein the first vertical portion 1953 is provided with a first through hole 441, and the metal sleeve 410 passes through the first through hole 441 and is fixedly connected with the first through hole 441; one end of the tap rod 430 is inserted into the metal sleeve 410, the other end is connected with the connector 400, the dielectric sleeve 420 is sleeved between the metal sleeve 410 and the tap rod 430, and the dielectric sleeve 420 is made of an insulating material. The resonant rod 191 and the metal sleeve 410 of the common filter cavity N1 can be combined together by welding; the dielectric sleeve 420 mainly plays a role of insulation; the design can use the mode of combining the metal sleeve 410 and the dielectric sleeve 420, and on the premise of ensuring insulation to form capacitive coupling, the tap strength can be improved.

Fig. 14 is a schematic structural diagram of a communication device according to an embodiment of the present application, and as shown in fig. 14, the communication device 10 according to the present embodiment includes an antenna 200 and a radio frequency unit 300 connected to the antenna 200, where the radio frequency unit 300 includes a filter 100 as shown in the above embodiment, and the filter 100 is used for filtering a radio frequency signal. The filter 100 of the present application may also adopt a dual low-pass connection mode to enhance the signal transmission effect.

It should be noted that the inventive concept of the present application can form many embodiments, but the present application has a limited space and cannot be listed one by one, so that, on the premise of no conflict, any combination between the above-described embodiments or technical features can form a new embodiment, and after the embodiments or technical features are combined, the original technical effect will be enhanced.

The foregoing is a more detailed description of the present application in connection with specific alternative embodiments, and the specific implementations of the present application are not to be considered limited to these descriptions. For those skilled in the art to which the present application pertains, several simple deductions or substitutions may be made without departing from the concept of the present application, and all should be considered as belonging to the protection scope of the present application.

Claims (9)

1. A filter, characterized in that the filter comprises:

a housing;

a common filter cavity disposed on the housing;

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

and

the second filtering path is arranged on the shell and consists of six filtering cavities which are sequentially coupled, and the six filtering cavities of the second filtering path form two inductive cross-coupling zeros;

the filter also comprises an output port, a first input end and a second input end, and the output port is connected with the common filter cavity; the first input end is connected with a fifth filter cavity of the first filter path; the second input end is connected with a sixth filtering cavity of the second filtering path;

and the first filter cavity of the first filter path and the first filter cavity of the second filter path are respectively coupled with the common filter cavity.

2. The filter of claim 1, wherein the housing has a first direction and a second direction, the second direction being perpendicular to the first direction;

a first filtering cavity, a second filtering cavity, a third filtering cavity, a fourth filtering cavity and a fifth filtering cavity of the first filtering channel are sequentially arranged in a row along the first direction;

the first filtering cavity, the second filtering cavity, the third filtering cavity, the fourth filtering cavity, the fifth filtering cavity and the sixth filtering cavity of the second filtering channel are sequentially arranged in a row along the first direction;

and the first filtering cavity of the second filtering channel is arranged corresponding to the public filtering cavity, and the first filtering cavity, the second filtering cavity, the third filtering cavity, the fourth filtering cavity and the fifth filtering cavity in the first filtering channel are respectively arranged corresponding to the second filtering cavity, the third filtering cavity, the fourth filtering cavity, the fifth filtering cavity and the sixth filtering cavity in the second filtering channel.

3. The filter of claim 2, wherein the first, second, third and fourth filter cavities of the first filter path are arranged in a parallelogram;

the first filtering cavity, the second filtering cavity, the third filtering cavity and the fourth filtering cavity of the second filtering channel are arranged in a parallelogram shape;

the fourth filtering cavity and the fifth filtering cavity of the first filtering channel and the fifth filtering cavity and the sixth filtering cavity of the second filtering channel are arranged in a parallelogram shape.

4. The filter of claim 3, wherein capacitive coupling pieces are arranged between the first filter cavity and the third filter cavity and between the third filter cavity and the fifth filter cavity of the first filter path; the working frequency band of the first filtering channel is 880MHz-960 MHz; inductive coupling pieces are arranged between the first filtering cavity and the third filtering cavity of the second filtering path and between the fourth filtering cavity and the sixth filtering cavity of the second filtering path, and flying rods are arranged between the third filtering cavity and the fifth filtering cavity of the second filtering path; the working frequency band of the second filtering path is 690MHz-862 MHz.

5. The filter of claim 4, wherein the flying bar comprises a first coupling part, a second coupling part and a connecting seat, and two sides of the connecting seat are respectively connected with the first coupling part and the second coupling part; a window is arranged between a third filtering cavity and a fifth filtering cavity of the second filtering channel, and the flying rod is arranged in the window.

6. The filter according to claim 1, wherein each of the filter cavities is provided with a resonance rod and a tuning rod; the resonance rod comprises a cavity wall and an inner cavity formed by the cavity wall; one end of the tuning rod is arranged in the inner cavity; the resonance rod is made of 316 steel, and the tuning rod is made of copper;

the cavity wall comprises a bottom wall and a side wall, two ends of the side wall bend and extend in a direction away from the inner cavity so as to form flanging structures at two ends of the side wall, and the flanging structures are arranged in parallel with the bottom wall;

the flanging structure comprises a vertical part and a horizontal part, one end of the horizontal part is connected with the side wall, the other end of the horizontal part is connected with the vertical part, the vertical part is arranged in parallel with the side wall, a chamfer structure is arranged at the joint of the horizontal part and the side wall, and the chamfer structure is a round chamfer.

7. The filter of claim 6, wherein the resonating bar in the common filtering cavity comprises a first vertical portion and a first horizontal portion, the first horizontal portion having a length in a range between 5.9 millimeters and 6 millimeters, the first vertical portion having a length in a range between 6.95 millimeters and 7.05 millimeters;

the resonant bar in the filter cavity of the first filter path includes a second vertical section and a second horizontal section, the second horizontal section having a length in a range of 4.1 mm to 4.2 mm, the second vertical section having a length in a range of 1.45 mm to 1.55 mm;

the resonance bar in the filter cavity of the second filter path includes a third vertical portion having a length ranging between 8.45 mm and 8.55 mm and a third horizontal portion having a length ranging between 7.7 mm and 7.8 mm.

8. The filter of claim 7, further comprising a metal sleeve, a dielectric sleeve, a tap rod and a connector, wherein the first vertical portion is provided with a first through hole, and the metal sleeve passes through the first through hole and is fixedly connected with the first through hole; one end of the tap rod is inserted into the metal sleeve, the other end of the tap rod is connected with the connector, the medium sleeve is sleeved between the metal sleeve and the tap rod, and the medium sleeve is made of an insulating material.

9. 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 1-8 for filtering a radio frequency signal.

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