CN113823885A - Filter - Google Patents
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- CN113823885A CN113823885A CN202111067384.5A CN202111067384A CN113823885A CN 113823885 A CN113823885 A CN 113823885A CN 202111067384 A CN202111067384 A CN 202111067384A CN 113823885 A CN113823885 A CN 113823885A
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
Abstract
The invention relates to a filter, which comprises a resonance module, wherein the resonance module is connected with an input port through a port input coupling line and is connected with an output port through a port output coupling line; the resonance unit of the resonance module comprises an inductance transmission line and a capacitance transmission line which are coupled in parallel based on a bent line structure. The resonance unit is designed into a parallel coupling transmission line structure based on a bending line, a traditional parallel coupling line structure is bent through a folding line to generate a parallel capacitor, and the size of the parallel capacitor is inversely proportional to the bending angle. Compared with a regular parallel coupling line, the filter disclosed by the invention has the advantages of miniaturization, strong coupling, low loss, broadband external suppression, high roll-off and the like. Meanwhile, the 5G base station filter disclosed by the invention adopts an irregular transmission line structure for the first time, and has the advantages of higher design freedom degree and the like.
Description
Technical Field
The invention relates to the technical field of filters, in particular to a filter.
Background
With the development of the fifth generation mobile communication (5G) technology, the demand of various terminal devices and base stations for 5G mobile communication systems has increased dramatically. The filter is an indispensable radio frequency device of a radio frequency front end of a 5G mobile communication system, has the function of selecting a useful signal and filtering useless interference signals, and plays a vital role at a 5G transmitting end, a relay station and a receiving end.
The existing 5G base station filter design is based on a regular structure, and the problems of large filter loss, unsatisfactory broadband out-of-band rejection, small design freedom, large design difficulty and the like exist.
Based on this, it is highly desirable to design a low loss filter.
Disclosure of Invention
The invention aims to provide a filter to reduce the loss of the filter.
In order to achieve the purpose, the invention provides the following scheme:
a filter, comprising:
the resonance module is connected with the input port through a port input coupling line and is connected with the output port through a port output coupling line; the resonance unit of the resonance module comprises an inductance transmission line and a capacitance transmission line which are coupled in parallel based on a bent line structure.
Optionally, the method further includes:
a metal ground port connected to the resonance module;
the metal isolation plate is connected with the resonance module;
a ceramic substrate;
the input port, the metal grounding port, the metal isolation plate and the output port are positioned on the surface of the ceramic substrate;
the port input coupling line, the resonance module and the port output coupling line are located inside the ceramic substrate.
Optionally, the resonance module includes a first resonance unit;
the first resonance unit comprises a first inductance resonance bent line and a first capacitance coupling bent line;
the first inductive resonance bent line and the first capacitive coupling bent line are opposite up and down and are mutually capacitively coupled;
the first inductance resonance bending line is connected with the port input coupling line and the port output coupling line;
one end of the first inductance resonance bending line is connected with the metal grounding port, and the other end of the first inductance resonance bending line is suspended in the air;
one end of the first capacitive coupling line is connected with the metal isolation plate, and the other end of the first capacitive coupling line is suspended.
Optionally, the resonance module includes a first resonance unit and a second resonance unit;
the first resonance unit and the second resonance unit are arranged side by side;
the first resonant unit comprises the first inductive resonant meander line and the first capacitive coupling meander line;
the first inductive resonance bent line and the first capacitive coupling bent line are opposite up and down and are mutually capacitively coupled;
the first inductance resonance bending line is connected with the port input coupling line;
one end of the first inductance resonance bending line is connected with the metal grounding port, and the other end of the first inductance resonance bending line is suspended in the air;
one end of the first capacitive coupling line is connected with the metal isolation plate, and the other end of the first capacitive coupling line is suspended in the air;
the second resonant unit comprises the second inductive resonant meander line and the second capacitive coupling meander line;
the second inductive resonance bent line and the second capacitive coupling bent line are opposite up and down and are mutually capacitively coupled;
the second inductance resonance bending line is connected with the port output coupling line;
one end of the second inductance resonance bending line is connected with the metal grounding port, and the other end of the second inductance resonance bending line is suspended in the air;
one end of the second capacitive coupling line is connected with the metal isolation plate, and the other end of the second capacitive coupling line is suspended.
Optionally, the resonance module includes a first resonance unit, a second resonance unit, and at least one third resonance unit;
the first resonance unit, the third resonance unit and the second resonance unit are arranged in parallel in sequence;
the first resonance unit is connected with the port input coupling line, the metal grounding port and the metal isolation plate;
the third resonance unit is connected with the metal grounding port and the metal isolation plate;
the metal grounding port, the metal isolation plate and the port output coupling line of the second resonance unit are connected.
Optionally, the first resonant unit comprises the first inductive resonant meander line and the first capacitive coupling meander line;
the first inductive resonance bent line and the first capacitive coupling bent line are opposite up and down and are mutually capacitively coupled;
the first inductance resonance bending line is connected with the port input coupling line;
one end of the first inductance resonance bending line is connected with the metal grounding port, and the other end of the first inductance resonance bending line is suspended in the air;
one end of the first capacitive coupling line is connected with the metal isolation plate, and the other end of the first capacitive coupling line is suspended in the air;
the third resonant unit comprises the third inductive resonant meander line and the third capacitive coupling meander line;
the third inductive resonance bent line and the third capacitive coupling bent line are opposite up and down and are mutually capacitively coupled;
one end of the third inductance resonance bending line is connected with the metal grounding port, and the other end of the third inductance resonance bending line is suspended in the air;
one end of the third capacitive coupling line is connected with the metal isolation plate, and the other end of the third capacitive coupling line is suspended in the air;
the second resonant unit comprises the second inductive resonant meander line and the second capacitive coupling meander line;
the second inductive resonance bent line and the second capacitive coupling bent line are opposite up and down and are mutually capacitively coupled;
the second inductance resonance bending line is connected with the port output coupling line;
one end of the second inductance resonance bending line is connected with the metal grounding port, and the other end of the second inductance resonance bending line is suspended in the air;
one end of the second capacitive coupling line is connected with the metal isolation plate, and the other end of the second capacitive coupling line is suspended. .
Optionally, the shape of the first resonance unit is the same as the shape and size of the second resonance unit.
Optionally, the length of the bending portion of the third inductive resonant bending line is greater than the length of the bending portion of the first inductive resonant bending line and the length of the bending portion of the second inductive resonant bending line.
Optionally, the widths of the inductive transmission line and the capacitive transmission line are the same.
Optionally, the value of the coupling capacitance is varied by varying the angle of the meander line.
Optionally, the size of the coupling capacitance is inversely proportional to the angle of the meander line.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention discloses a filter, wherein a resonance unit is designed into a parallel coupling transmission line structure based on a bent line, a traditional parallel coupling line structure is bent in a broken line mode to generate a parallel capacitor, and the size of the parallel capacitor is inversely proportional to the bending angle. Compared with a regular parallel coupling line, the filter disclosed by the invention has the advantages of miniaturization, strong coupling, low loss, broadband external suppression, high roll-off and the like. Meanwhile, the 5G base station filter disclosed by the invention adopts an irregular transmission line structure for the first time, and has the advantages of higher design freedom degree and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed 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 invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts. The following drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention.
Fig. 1 shows a schematic diagram of a filter structure according to the invention;
figure 2 shows a perspective view of a filter structure according to the invention;
fig. 3 shows a schematic diagram of a resonator cell structure of a filter according to the invention.
Fig. 4(a) shows an equivalent circuit of a meander line of a filter according to the present invention, and fig. 4(b) shows a common equivalent circuit of a microstrip line;
figure 5 shows a performance graph of a filter according to the invention.
Description of the symbols:
the device comprises a Die-ceramic matrix, a P1-input port, a P2-output port, a Gndl-first metal ground port, a Gnd 2-second metal ground port, a Sdl-first metal isolation plate, a Sd 2-second metal isolation plate, a R1-first resonant unit, a R2-second resonant unit, a R3-third resonant unit, a PL 1-port input coupling line, a PL 2-port output coupling line, a SL 1-first inductive resonant bent line, a Crl-first capacitive coupling bent line, a SL 2-second inductive resonant bent line, a Cr 2-second capacitive coupling bent line, a SL 3-third inductive resonant bent line and a Cr 3-third capacitive coupling bent line.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As used in this disclosure and in the claims, the terms "a," "an," "the," and/or "the" are not intended to be inclusive in the singular, but rather are inclusive in the plural, unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that steps and elements are included which are explicitly identified, that the steps and elements do not form an exclusive list, and that a method or apparatus may include other steps or elements.
The invention aims to provide a filter to reduce the loss of the filter.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Due to the requirements of miniaturization and low loss and high efficiency design of the 5G base station, the design of a small-sized low insertion loss filter has become an important link for the development of the 5G base station. In order to provide guarantee for the development of the low frequency band 5G by "using the usage plan adjustment of the frequency band of 702 + 798MHz for the mobile communication system in the 3 month of 2020", which is released by the ministry of industry and communications, "providing the low frequency band 5G development," the present embodiment provides an LTCC filter based on a meander line structure facing the low frequency band of 702 + 798MHz, as shown in fig. 1, including:
a resonant block connected to the input port P1 via a port input coupling line PL1 and connected to the output port P2 via a port output coupling line PL 2; the resonance unit of the resonance module comprises an inductive transmission line and a capacitive transmission line which are coupled in parallel based on a meander line structure, preferably, the input port P1 is an input port P1 with 50 ohm impedance, and the output port P2 is an output port P2 with 50 ohm impedance;
metal ground ports connected to the resonance module, as shown in fig. 2, the metal ground ports including a first metal ground port Gand1 and a second metal ground port Gand 2;
the metal isolation plate is connected with the resonance module and consists of an upper copper layer and a lower copper layer, the surface of the copper layer is provided with a square recess, and relevant data such as insertion loss and the like can be changed by adjusting the shape of the copper layer, and as shown in fig. 2, the metal isolation plate comprises a first metal isolation plate Sd1 and a second metal isolation plate Sd 2;
a ceramic matrix Die;
the input port P1, the metal ground port, the metal isolation plate and the output port P2 are positioned on the surface of the ceramic matrix Die;
the port input coupling line PL1, the resonant block, and the port output coupling line PL2 are located inside the ceramic base Die.
The input port P1, the output port P2, the metal grounding port, the metal isolation plate, the port input coupling line PL1, the port output coupling line PL2 and the resonant module are all made of metal copper materials, and the preparation process of the filter is a low temperature co-fired ceramic (LTCC) technology. As an integrated component technology, a low temperature co-fired ceramic (LTCC) technology has good performance of a filter prepared according to the LTCC technology due to excellent high temperature resistance, excellent high-frequency characteristics, broadband characteristics and a low-cost process.
As an alternative embodiment, a plurality of the metal ground ports are connected to form a closed space; the closed space is connected with the metal isolation plates to form a shielding surface, and as shown in fig. 2, the first metal isolation plate Sd1 and the second metal isolation plate Sd2 are composed of upper and lower copper layers with square depressions and are connected with the first metal grounding port Gnd1 and the second metal grounding port Gnd2 to form the shielding surface. The shielding surface is correspondingly arranged on the opposite surface of the ceramic substrate Die to provide a shielding environment for the resonance module.
Because this implementation adopts the parallel coupling transmission line structure design resonance module based on the kinked line, compare with regular structure, because the structural feature of kinked line structure has introduced extra distributed parallel capacitance, therefore resonance module has advantages such as miniaturization, strong coupling transmission, low insertion loss and design degree of freedom are big, therefore the 5G basic station filter that this embodiment provided has advantages such as small, with low costs, the loss is little, outband restraines width and high roll-off. Meanwhile, the base station filter provided by the embodiment adopts an irregular transmission line structure for the first time, and further has the advantages of novel structure, large design freedom degree and the like.
In order to make the structure of the resonance module more clearly understood by those skilled in the art, the following detailed description is given.
When only one resonant cell is included in the resonant module, the structure is as follows:
the resonance module comprises a first resonance unit R1;
the first resonance cell R1 comprises a first inductive resonance meander line SL1 and a first capacitive coupling meander line Cr 1;
the first inductive resonance bent line SL1 and the first capacitive coupling bent line Cr1 are opposite to each other in the up-down direction and are mutually capacitively coupled;
the first inductive resonant bending line SL1 is connected with the port input coupling line PL1 and the port output coupling line PL 2;
one end of the first inductive resonant bending line SL1 is connected with the metal grounding port, and the other end of the first inductive resonant bending line SL1 is suspended;
one end of the first capacitive coupling line is connected with the metal isolation plate, and the other end of the first capacitive coupling line is suspended.
When two resonance units are included in the resonance module, the structure is as follows:
the resonance module comprises a first resonance unit R1, a second resonance unit R2;
the first resonance unit R1 and the second resonance unit R2 are arranged side by side;
the first resonance cell R1 comprises the first inductive resonance meander line SL1 and the first capacitive coupling meander line Cr 1;
the first inductive resonance bent line SL1 and the first capacitive coupling bent line Cr1 are opposite to each other in the up-down direction and are mutually capacitively coupled;
the first inductive resonant meander line SL1 is connected to the port input coupling line PL 1;
one end of the first inductive resonant bending line SL1 is connected with the metal grounding port, and the other end of the first inductive resonant bending line SL1 is suspended;
one end of the first capacitive coupling line is connected with the metal isolation plate, and the other end of the first capacitive coupling line is suspended in the air;
the second resonance cell R2 comprises the second inductive resonance meander line SL2 and the second capacitive coupling meander line Cr 2;
the second inductive resonance bent line SL2 and the second capacitive coupling bent line Cr2 are opposite to each other in the up-down direction and are mutually capacitively coupled;
the second inductive resonant bending line SL2 is connected with the port output coupling line PL 2;
one end of the second inductive resonant bending line SL2 is connected with the metal grounding port, and the other end of the second inductive resonant bending line SL2 is suspended;
one end of the second capacitive coupling line is connected with the metal isolation plate, and the other end of the second capacitive coupling line is suspended.
When a plurality of resonance units are included in the resonance module, the structure thereof is as follows, as shown in fig. 2 and 3, a filter structure including 3 resonance units:
the resonance module comprises a first resonance unit R1, a second resonance unit R2 and at least one third resonance unit R3;
the first resonance unit R1, the third resonance unit R3 and the second resonance unit R2 are arranged side by side in sequence;
the first resonant cell R1 is connected to the port input coupling line PL1, the second metal ground port gard 2 and the first metal isolation plate Sd 1;
the third resonant cell R3 is connected to the second metal ground port gard 2 and the first metal separator Sd 1;
the second resonant cell R2 is connected to the second metal ground port gard 2, the first metal isolation plate Sd1 and the port out-coupling line PL 2.
The first resonance cell R1 comprises the first inductive resonance meander line SL1 and the first capacitive coupling meander line Cr 1;
the first inductive resonance bent line SL1 and the first capacitive coupling bent line Cr1 are opposite to each other in the up-down direction and are mutually capacitively coupled;
the first inductive resonant meander line SL1 is connected to the port input coupling line PL 1;
one end of the first inductance resonance bent line SL1 is connected with the second metal grounding port Gand2, and the other end of the first inductance resonance bent line SL1 is suspended;
one end of the first capacitive coupling line is connected with the first metal isolation plate Sd1, and the other end of the first capacitive coupling line is suspended;
the third resonance cell R3 comprises the third inductive resonance bend SL3 and the third capacitive coupling bend Cr 3;
the third inductive resonance bent line SL3 and the third capacitive coupling bent line Cr3 are opposite to each other in the up-down direction and are mutually capacitively coupled;
one end of the third inductive resonant meander line SL3 is connected to the second metal ground port gan d2, and the other end is suspended;
one end of the third capacitive coupling line is connected with the first metal isolation plate Sd1, and the other end of the third capacitive coupling line is suspended;
the second resonance cell R2 comprises the second inductive resonance meander line SL2 and the second capacitive coupling meander line Cr 2;
the second inductive resonance bent line SL2 and the second capacitive coupling bent line Cr2 are opposite to each other in the up-down direction and are mutually capacitively coupled;
the second inductive resonant bending line SL2 is connected with the port output coupling line PL 2;
one end of the second inductive resonant meander line SL2 is connected to the second metal ground port gan d2, and the other end is suspended;
one end of the second capacitively coupled line is connected to the first metal spacer Sd1, and the other end is suspended.
It should be noted that the above-mentioned "first", "second", "third", etc. should not be construed as limiting the present embodiment.
As an alternative embodiment, the shape of the first resonance unit R1 is the same as the shape and size of the second resonance unit R2, and the widths of the inductive transmission line and the capacitive transmission line in the resonance units are the same. Since the capacitance generated by the coupling between the meander lines is related to the coupling area, the effective area between the inductor meander lines and the capacitor meander lines is constant, and thus the same width can be designed to largely avoid unnecessary troubles.
As an alternative embodiment, the length of the bent portion of the third inductive resonance bent line SL3 is greater than the length of the bent portion of the first inductive resonance bent line SL1 and the length of the bent portion of the second inductive resonance bent line SL2, wherein the length of the bent portion of the third inductive resonance bent line SL3 may be designed to decrease toward both sides of the first resonance unit R1 and the second resonance unit R2.
Fig. 4 provides an equivalent circuit of a meander line and an equivalent circuit of a normal microstrip line, in a resonant structure of a filter, the meander line generates more capacitance in a limited length compared to the normal microstrip line, and at the same time, the meander line has a reduced size in space and a reduced cost.
The resonance structure mainly comprises a capacitor and an inductor which are connected in parallel, the microstrip line is mainly the inductor, the capacitance is changed, the bent line can improve the capacitance, and the main capacitance is generated by coupling between two bevel edges of the bent line. Therefore, the value of the coupling capacitance can be changed by changing the angle of the inclined edge, and the size of the parallel capacitance is inversely proportional to the bending angle.
To verify the validity of the solution of the present embodiment, the following simulation experiment was performed.
In this embodiment, the filter is designed through HFSS three-dimensional modeling simulation, and the size of the low-loss filter facing the 5G base station based on the LTCC technology is only the size
The dielectric constant of the adopted ceramic material is 32, the thickness of the internal metal copper is 0.01mm, and the key parameters of the model are the sizes of an inductance resonance line and a capacitance coupling line: the widths of the unbent parts of the inductive resonance bent lines are both 0.35mm, and the widths of the unbent parts of the capacitive coupling bent lines are both 0.35 mm. The total length of the unbent portions of the first capacitive coupling meander line Cr1, the third capacitive coupling meander line Cr3 and the second capacitive coupling meander line Cr2 is 2.63mm, and the total length of the meander portion is 4 mm. The total length of the unbent portions of the first and second inductive resonant meander lines SL1 and SL2 is 1.6mm, and the total length of the bent portions is 4 mm.
The performance of the low-loss filter for the 5G base station is analyzed, fig. 5(a) shows the S-parameters of the filter, the curves labeled m1 and m2 show the insertion loss of the filter, the curve labeled m3 shows the return loss of the filter, and fig. 5(b) shows the voltage standing wave ratio of the filter. As shown in FIG. 5, the working band of the filter with three resonant units is 702-798MHz, the return loss in the bandwidth is less than 15dB, the insertion loss in the bandwidth is less than 0.6dB, the 3-dB insertion loss bandwidth is 200MHz, the roll-off coefficient is 218.75dB/GHz, and the out-of-band rejection at 4GHz is less than-25 dB. Therefore, the base station filter disclosed by the embodiment has the advantages of small size, low insertion loss, broadband external suppression, high roll-off and the like, and can provide high-performance filter characteristics for a low-frequency band 5G base station system.
In the embodiment, the traditional parallel coupling line structure is bent by a broken line to generate the parallel capacitor, and the size of the parallel capacitor is inversely proportional to the bending angle. Compared with a regular parallel coupling line, the bent parallel coupling line structure disclosed by the embodiment has the advantages of miniaturization, strong coupling, low loss, broadband external suppression, high roll-off and the like. Meanwhile, the 5G base station filter disclosed by the embodiment adopts an irregular transmission line structure for the first time, and has the advantages of higher design freedom degree and the like.
The present invention has been described using specific terms to describe embodiments of the invention. Such as "first/second embodiment," "an embodiment," and/or "some embodiments" means a feature, structure, or characteristic described in connection with at least one embodiment of the invention. Therefore, it is emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, some of the features, structures, or characteristics of one or more embodiments of the present invention may be combined as suitable.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The foregoing is illustrative of the present invention and is not to be construed as limiting thereof. Although a few exemplary embodiments of this invention have been described, those skilled in the art will readily appreciate that many modifications are possible in the exemplary embodiments without materially departing from the novel teachings and advantages of this invention. Accordingly, all such modifications are intended to be included within the scope of this invention as defined in the claims. It is to be understood that the foregoing is illustrative of the present invention and is not to be construed as limited to the specific embodiments disclosed, and that modifications to the disclosed embodiments, as well as other embodiments, are intended to be included within the scope of the appended claims. The invention is defined by the claims and their equivalents.
Claims (10)
1. A filter, comprising:
the resonance module is connected with the input port through a port input coupling line and is connected with the output port through a port output coupling line; the resonance unit of the resonance module comprises an inductance transmission line and a capacitance transmission line which are coupled in parallel based on a bent line structure.
2. A filter according to claim 1, further comprising:
a metal ground port connected to the resonance module;
the metal isolation plate is connected with the resonance module;
a ceramic substrate;
the input port, the metal grounding port, the metal isolation plate and the output port are positioned on the surface of the ceramic substrate;
the port input coupling line, the resonance module and the port output coupling line are located inside the ceramic substrate.
3. A filter according to claim 2, wherein the resonance module comprises a first resonance unit;
the first resonance unit comprises a first inductance resonance bent line and a first capacitance coupling bent line;
the first inductive resonance bent line and the first capacitive coupling bent line are opposite up and down and are mutually capacitively coupled;
the first inductance resonance bending line is connected with the port input coupling line and the port output coupling line;
one end of the first inductance resonance bending line is connected with the metal grounding port, and the other end of the first inductance resonance bending line is suspended in the air;
one end of the first capacitive coupling line is connected with the metal isolation plate, and the other end of the first capacitive coupling line is suspended.
4. A filter according to claim 2, wherein the resonance module comprises a first resonance unit, a second resonance unit;
the first resonance unit and the second resonance unit are arranged side by side;
the first resonant unit comprises the first inductive resonant meander line and the first capacitive coupling meander line;
the first inductive resonance bent line and the first capacitive coupling bent line are opposite up and down and are mutually capacitively coupled;
the first inductance resonance bending line is connected with the port input coupling line;
one end of the first inductance resonance bending line is connected with the metal grounding port, and the other end of the first inductance resonance bending line is suspended in the air;
one end of the first capacitive coupling line is connected with the metal isolation plate, and the other end of the first capacitive coupling line is suspended in the air;
the second resonant unit comprises the second inductive resonant meander line and the second capacitive coupling meander line;
the second inductive resonance bent line and the second capacitive coupling bent line are opposite up and down and are mutually capacitively coupled;
the second inductance resonance bending line is connected with the port output coupling line;
one end of the second inductance resonance bending line is connected with the metal grounding port, and the other end of the second inductance resonance bending line is suspended in the air;
one end of the second capacitive coupling line is connected with the metal isolation plate, and the other end of the second capacitive coupling line is suspended.
5. A filter according to claim 2, wherein the resonator module comprises a first resonator element, a second resonator element and at least one third resonator element;
the first resonance unit, the third resonance unit and the second resonance unit are arranged in parallel in sequence;
the first resonance unit is connected with the port input coupling line, the metal grounding port and the metal isolation plate;
the third resonance unit is connected with the metal grounding port and the metal isolation plate;
the metal grounding port, the metal isolation plate and the port output coupling line of the second resonance unit are connected.
6. A filter according to claim 5, said first resonant cell comprising said first inductive resonant meander line and said first capacitive coupling meander line;
the first inductive resonance bent line and the first capacitive coupling bent line are opposite up and down and are mutually capacitively coupled;
the first inductance resonance bending line is connected with the port input coupling line;
one end of the first inductance resonance bending line is connected with the metal grounding port, and the other end of the first inductance resonance bending line is suspended in the air;
one end of the first capacitive coupling line is connected with the metal isolation plate, and the other end of the first capacitive coupling line is suspended in the air;
the third resonant unit comprises the third inductive resonant meander line and the third capacitive coupling meander line;
the third inductive resonance bent line and the third capacitive coupling bent line are opposite up and down and are mutually capacitively coupled;
one end of the third inductance resonance bending line is connected with the metal grounding port, and the other end of the third inductance resonance bending line is suspended in the air;
one end of the third capacitive coupling line is connected with the metal isolation plate, and the other end of the third capacitive coupling line is suspended in the air;
the second resonant unit comprises the second inductive resonant meander line and the second capacitive coupling meander line;
the second inductive resonance bent line and the second capacitive coupling bent line are opposite up and down and are mutually capacitively coupled;
the second inductance resonance bending line is connected with the port output coupling line;
one end of the second inductance resonance bending line is connected with the metal grounding port, and the other end of the second inductance resonance bending line is suspended in the air;
one end of the second capacitive coupling line is connected with the metal isolation plate, and the other end of the second capacitive coupling line is suspended.
7. A filter according to claim 4 or 5, characterised in that the shape of the first resonator element is the same size as the shape of the second resonator element.
8. A filter as claimed in claim 6, wherein the length of the meander portion of the third inductive resonant meander line is greater than the length of the meander portion of the first inductive resonant meander line and the length of the meander portion of the second inductive resonant meander line.
9. A filter according to claim 1, wherein the inductive transmission lines and the capacitive transmission lines have the same width.
10. A filter according to claim 1, wherein the value of the coupling capacitance is varied by varying the angle of the meander line; the size of the coupling capacitance is inversely proportional to the angle of the meander line.
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| CN202111067384.5A CN113823885B (en) | 2021-09-13 | 2021-09-13 | Filter |
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