CN109155450A - Radio-frequency filter - Google Patents
Radio-frequency filter Download PDFInfo
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- CN109155450A CN109155450A CN201680085836.3A CN201680085836A CN109155450A CN 109155450 A CN109155450 A CN 109155450A CN 201680085836 A CN201680085836 A CN 201680085836A CN 109155450 A CN109155450 A CN 109155450A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
- H01P1/2084—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure with dielectric resonators
- H01P1/2086—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure with dielectric resonators multimode
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/16—Auxiliary devices for mode selection, e.g. mode suppression or mode promotion; for mode conversion
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Abstract
Describe radio-frequency filter (100).The radio-frequency filter includes having first mode (1a), the first dual-mode resonator (102) of second mode (2a) and the first spurious mode (Sa), wherein, first dual-mode resonator (102) includes coupling element (112) in be coupled to the first mode (1a) first spurious mode (Sa) first, the second dual-mode resonator (104) with the third mode (3b) and fourth mode (4b), and the mutual coupling element (106) being arranged between first dual-mode resonator (102) and second dual-mode resonator (104), the first mode (1a) is coupled to the fourth mode (4b) by mutual coupling element (106) the mutual coupling element, by the second mode (2a) be coupled to the third mode ( 3b), and by first spurious mode (Sa) it is coupled to the third mode (3b).
Description
Technical field
The present invention relates to radio-frequency filter and the communication equipment including this radio-frequency filter.
Background technique
As radio becomes more miniaturization and integrated, for producing low-loss small in size or low-profile, height
Power filter has regenerated demand.Firstly, this be in order to make component close packing and with the large-scale antenna battle array of MIM0 system
Column are used cooperatively.
However, the rejection specification of this filter be it is stringent, so as to simultaneously meet strict supervision launch requirements,
And to provide necessary protection with the sensitive receiver electronic device that high power transmission device amplifier is multiplexed.
In order to provide suitable filtering, higher order filter is needed to realize that acceptable passband roll-offs and Out-of-band rejection.So
And the increase of the rank with filter, the total capacity of filter also increase.In order to solve this problem, it is solid to develop multimode
State dielectric waveguide filter merges the pole of multiple resonance or filter function in single physical part.Due to using
Certain bulk materials high dielectric constant electric field concentration effect, which improves space efficiency more significantly.
However, usually filter specifications are so stringent, so that using the basic bandpass filtering with theoretically necessary rank
Device realizes that filter function is infeasible.Realize that filtering passes on the contrary, being referred to as cross-linked additional transmitted path and introducing to provide
In the filter of the method for transmission zero as defined in delivery function.It is placed on around passband to these transmission zero property of can choose,
To provide significant additional inhibition at design requirement.
However, due to the limitation of physical structure, realizing required additional coupling path in solid-state multimode delectric filter
It is not easy to.Especially in dual-mode waveguide filter, used Main Patterns are orthogonal, only at two of similar alignment
Coupling easy to accomplish between mode.It is generally necessary to realize required intersection coupling using complicated external auxiliary component or structure
It closes, production cost is considerably increased by the demand of additional components itself, and configure their complexity during increasing manufacture
Property.
Optionally, can intentionally be limited to the quantity of the transmission zero used can be from given physics by designer
Nature and the quantity being readily available in structure.Although simple, at low cost, as a result it is achieved that getting up unlike theoretically may be used
Space is saved as row.
Summary of the invention
The purpose of embodiments of the invention is to provide the radio-frequency filters of the problem of reducing using traditional solution a kind of.
Another purpose of the embodiment of the present invention is to provide a kind of radio-frequency filter, mentions relative to conventional radio frequency filter
For adding coupling path.
Another purpose of the embodiment of the present invention is to provide a kind of use the first dual-mode resonator and the second dual-mode resonator
Radio-frequency filter with desired any filter topologies.
The additional purpose of the embodiment of the present invention be to provide it is a kind of using solid dielectric two-mode waveguide technology have expectation
Any filter topologies radio-frequency filter.
Above-mentioned target is realized by subject matter of the independent claims.Further advantageous way of realization of the invention can be
It is found in dependent claims.
According to the first aspect of the invention, a kind of radio-frequency filter is provided.The radio-frequency filter includes having the first mould
First dual-mode resonator of formula, second mode and the first spurious mode.First dual-mode resonator includes being coupled to first mode
Coupling element, the second dual-mode resonator with the third mode and fourth mode and setting exist in the first of first spurious mode
Mutual coupling element between first dual-mode resonator and the second dual-mode resonator, the mutual coupling element is by the first mode coupling
The fourth mode is closed, the second mode is coupled to the third mode, and first spurious mode is coupled
To the third mode.
Using the radio-frequency filter according to first aspect, narrower filter function can be provided.This is because passing through the
A possibility that first mode is coupled to the third mode by one spurious mode.
According in a first aspect, in the first possible way of realization of radio-frequency filter, the first dual-mode resonator and
Two dual-mode resonators are arranged with its respective center along common central axis.Mutual coupling element includes being with common central axis
The elongated iris of the first of center and perpendicular to the first elongated iris setting and from the second elongated rainbow of common distortion
Film.
Using the radio-frequency filter according to the first possible way of realization, the magnetic field line of the first spurious mode is in mutual coupling
It is parallel with the magnetic field line of the third mode at element, to provide the coupling between the first spurious mode and the third mode.
According to the first possible way of realization, in second of possible way of realization of radio-frequency filter, along altogether
Same central axis, the magnetic field strength of the first spurious mode is in its minimum value and the electric field strength of the first spurious mode is in it
Maximum value.This is that the first spurious mode provides the advantageous tendency of desired coupling between the first spurious mode and the third mode.
According to the first or second of possible way of realization, in the third possible way of realization of radio-frequency filter
In, the second elongated iris is on the direction of the length component of the first elongated iris from common distortion.First elongated rainbow
Film and the second elongated iris are connected to each other, or gap are arranged between the first elongated iris and the second elongated iris.First
Elongated iris has longest size along length component.As described above, the second elongated iris is set perpendicular to the first elongated iris
It sets.In the case where the first elongated iris and the second elongated iris are connected to each other, two irises are formed together T shape.
Another advantage of the elongated iris of mobile second is, due to the magnetic vector pair of second mode and the third mode
There is constant amplitude and direction for the position of all irises, coupling in a second mode between the third mode 3b it is strong
Degree is constant for its position.This means that the coupling between second mode and the third mode can be by changing iris length
It controls, and the coupling from spurious mode can control by the position of the second elongated iris, to allow according to list
A feature independent control two couplings.
According to the first any one of to the third possible way of realization, the 4th kind in radio-frequency filter is possible
In way of realization, the electric field vector parallel of the length component of the first elongated iris and second of mode is arranged.Second elongated iris
Length component and first mode electric field vector parallel be arranged.
According to any one of first to fourth kind of possible way of realization or first aspect itself, in radio-frequency filter
5th kind can plant in the form of being able to achieve, and the first side and second side of first dual-mode resonator is arranged in coupling element in first
Between borderline region at, in the borderline region, the magnetic field line at least partly Horizon of first spurious mode and first mode
Row.This is the vantage point of interior coupling element, to obtain the high coupling efficiency between first mode and the first spurious mode.
According to the 5th kind of possible way of realization, in the 6th kind of possible way of realization of radio-frequency filter, in first
Coupling element is one in recess, at least one local chamfering and at least one partial cut-out.These shapes of interior coupling element
Formula is advantageous, to obtain the high coupling efficiency between first mode and the first spurious mode, and obtain it is desired other
Lower coupling efficiency between mode.In order to obtain lower coupling efficiency between other modes, recess may be most preferred；And it is
Possible highest coupling efficiency, other forms may be more desirable between realization first mode and the first spurious mode.
First dual-mode resonator may include dielectric material block, and interior coupling element configuration is in the dielectric material block.
According to the 5th kind or the 6th kind of possible way of realization, in the 7th kind of possible way of realization of radio-frequency filter
In, the second dual-mode resonator has the second spurious mode, and including the second spurious mode is coupled to the second of the third mode
Interior coupling element.
Coupling element is arranged at the borderline region between the first side of the second dual-mode resonator and second side in second,
The borderline region, the second spurious mode and the magnetic field line of the third mode are at least partly parallel.This is the advantageous of interior coupling element
Position, to obtain the high coupling efficiency between the second spurious mode and the third mode.
Coupling element is one in recess, at least one local chamfering and at least one partial cut-out in second.Interior coupling
These forms for closing element are advantageous, to obtain the high coupling efficiency between the second spurious mode and the third mode and to obtain
Obtain the lower coupling efficiency between other desired modes.In order to obtain lower coupling efficiency between other modes, recess may be
Most preferably；And in order to realize possible highest coupling efficiency between the second spurious mode and the third mode, other shapes mentioned
Formula may be more desirable.
Second dual-mode resonator may include dielectric material block, and interior coupling element configuration is in the dielectric material block.
According to the 7th kind of possible way of realization, in the 8th kind of possible way of realization of radio-frequency filter, in second
Coupling element is one in recess, at least one local chamfering and at least one partial cut-out.These shapes of interior coupling element
Formula is advantageous, to obtain the high coupling efficiency between first mode and the first spurious mode, and obtain it is desired other
Lower coupling efficiency between mode.In order to obtain lower coupling efficiency between other modes, recess may be most preferred；And it is
Possible highest coupling efficiency, other forms may be more desirable between realization first mode and the first spurious mode.
First dual-mode resonator may include dielectric material block, and interior coupling element configuration is in the dielectric material block.
According to the 7th kind or the 8th kind of possible way of realization, in the 9th kind of possible way of realization of radio-frequency filter
In, the first spurious mode is also coupled to the second spurious mode by mutual coupling element.This is the substitution of above-mentioned possible way of realization
Scheme.
It is described mutual in the tenth kind of possible way of realization of radio-frequency filter according to the 9th kind of possible way of realization
Coupling element includes the elongated iris of third, and the elongated iris of third is arranged in parallel with the described second elongated iris, and in
Mandrel is relative to mobile from central axis on the opposite side of the described second elongated iris.
The effect of the elongated iris of third is to avoid directly being coupled to the third mode from first spurious mode.First is parasitic
The magnetic field of mode surrounds common center axis rotation, and the magnetic field of the third mode surrounds perpendicular to common central axis and is parallel to
The rotation of the axis of second elongated iris and the elongated iris of third.Therefore, by the second elongated iris from the first spurious mode to
Any positive coupling of three modes is largely passed through class of the elongated iris of third from the first spurious mode to the third mode
Like negative coupling counters.
The second elongated iris and the elongated iris of third are set around common substantially symmetrical about its central axisly, posted to optimize from first
The counteracting of coupling of the raw mode to the third mode, can be preferred.The optimization is the radial dependence due to magnetic field strength.
According to any one of the 7th kind to the tenth kind of possible way of realization, in a kind of the tenth possibility of radio-frequency filter
Way of realization in, first mode, second mode, the third mode and fourth mode are formed together filter passband, also, wherein
The frequency of the frequency of first spurious mode and the second spurious mode is except filter passband.
According to any one of the 7th kind to a kind of the tenth possible way of realization, the 12nd kind in radio-frequency filter can
In the way of realization of energy, at least one of electric field intensity of the electric field intensity of the first spurious mode and the second spurious mode is parallel
In common central axis.
According to the first to any one of the 12nd kind of possible way of realization or first aspect itself, in rf filtering
In 13rd kind of possible way of realization of device, the first dual-mode resonator includes the third for coupling first mode to second mode
Interior coupling element.
Be conducive to the close coupling having between first mode and second mode.
Coupling element is arranged at the borderline region between the side of the first dual-mode resonator in third, in the frontier district
The magnetic field line of domain, first mode and second mode is at least partly parallel.This is the vantage point of coupling element in third, so as to
Obtain the high coupling efficiency between first mode and second mode.
Coupling element is one in recess, at least one local chamfering and at least one partial cut-out in third.Interior coupling
These forms for closing element are advantageous, to obtain the high coupling efficiency between first mode and the first spurious mode, and
Obtain the desired lower coupling efficiency between other modes.
According to the first to any one of the 13rd kind of possible way of realization or first aspect itself, in rf filtering
In 14th kind of possible way of realization of device, the second dual-mode resonator includes couple the third mode to fourth mode the 4
Interior coupling element.Be conducive to that there is close coupling between the third mode and fourth mode.
Coupling element is arranged at the borderline region between the side of the second dual-mode resonator in 4th, in the frontier district
The magnetic field line of domain, the third mode and fourth mode is at least partly parallel.This is the vantage point of coupling element in the 4th, so as to
Obtain the high coupling efficiency between the third mode and fourth mode.
Coupling element is one in recess, at least one local chamfering and at least one partial cut-out in 4th.Interior coupling
These forms for closing element are advantageous, and to obtain the high coupling efficiency between the third mode and fourth mode, also, are obtained
Lower coupling efficiency between other desired modes.
Second dual-mode resonator may include dielectric material block, and interior coupling element configuration is in the dielectric material block.
According to the first to any one of the 14th kind of possible way of realization or first aspect itself, in rf filtering
In 15th kind of possible way of realization of device, the first dual-mode resonator includes the first integral blocks and the covering of solid dielectric material
First conductive layer of first integral blocks, and the second dual-mode resonator includes the second integral blocks of solid dielectric material and covers
Cover the second conductive layer of second integral blocks.
By, with the first integral blocks of dielectric material, having in the second dual-mode resonator in the first dual-mode resonator
Second dielectric material, the size of the first dual-mode resonator and the two the first dual-mode resonators.Size depends on Jie in integral blocks
Electric constant.
According to the 14th kind or the 15th kind of possible way of realization, in the 16th kind of possible realization of radio-frequency filter
In form, the first integral blocks, the second integral blocks and coupling element are formed together integral unit.By the first integral blocks, second whole
Body block and coupling element are formed together integral unit, can promote the manufacture of radio-frequency filter.
According to second aspect, a kind of communication equipment for wireless communication system is provided, which includes basis
The first of first aspect to any one of the 16th kind of possible way of realization or first aspect itself radio-frequency filter.
Detailed description of the invention
Fig. 1 a shows the dual-mode resonator with first mode and second mode.
Fig. 1 b shows the interchangeable dual-mode resonator with first mode and second mode.
Fig. 2 a shows in Fig. 1 a and shows the dual-mode resonator of the first spurious mode.
Fig. 2 b shows in Fig. 1 b and shows the dual-mode resonator of the first spurious mode.
Fig. 3 is the view along the first dual-mode resonator of the first parasitic fields line.
Fig. 4 is the view according to the first dual-mode resonator along the first parasitic fields line of an alternate embodiment.
Fig. 5 schematically shows radio-frequency filter according to an embodiment of the invention.
Fig. 6 has shown the concept for the mutual coupling element being arranged between the first dual-mode resonator and the second dual-mode resonator.
Fig. 7 is the view of the first dual-mode resonator in Fig. 6 of common central axis.
Fig. 8 shows radio-frequency filter according to an embodiment of the invention.
Fig. 9 shows the coupled characteristic by the mutual coupling element in the radio-frequency filter in Fig. 8.
Figure 10 schematically shows radio-frequency filter according to an embodiment of the invention.
Figure 11 schematically shows radio-frequency filter according to an embodiment of the invention.
Figure 12 schematically shows radio-frequency filter according to an embodiment of the invention.
Figure 13 schematically shows the first resonator with coupling element in various forms of thirds.
Figure 14 to Figure 18 schematically show different embodiment according to the subject invention using radio-frequency filter realize
The different examples of filter function.
Figure 19 schematically shows radio-frequency filter 100 according to an embodiment of the invention.
Figure 20 shows the radio-frequency filter of the embodiment according to Figure 19.
Figure 21 schematically shows the communication equipment in wireless communication system.
Specific implementation form
In the following description of the embodiments of the present invention, identical appended drawing reference will be used for identical in different attached drawings or wait
Same feature.
In being described below of embodiment, the electromagnetic mode in dielectric integral blocks will be described to explain embodiment.
Fig. 1 a shows the dual-mode resonator 102 with first mode 1a and second mode 2a.Fig. 1 b is shown with
The interchangeable dual-mode resonator 102 of one mode 1a and second mode 2a.First mode 1a has the first electric field intensity E1 and the
One magnetic vector H1.Second mode 2a has the second electric field intensity E2 and the second magnetic vector H2.First electric field intensity E1 is vertical
In the second electric field intensity E2.The frequency of first mode 1a is similar to the frequency of second mode 2a, and depends on dual-mode resonator
102 size and the dielectric constant of dual-mode resonator 102.Thus with dual-mode resonator 102 by the material with high dielectric constant
The case where material composition, is compared, in the case where dual-mode resonator 102 is made of the air that reflection side surrounds, dual-mode resonator 102
Size will be bigger.
Fig. 2 a shows in Fig. 1 a and shows the dual-mode resonator 102 of the first spurious mode Sa.Fig. 2 b shows Fig. 1 b
In show the dual-mode resonator 102 of the first spurious mode Sa.First spurious mode Sa includes the first parasitic fields vector Es
With the first stray magnetic fields vector Hs.First parasitic fields vector Es is perpendicular to the first electric field intensity E1 and the second electric field intensity E2.
In the embodiment shown in Fig. 1 a and Fig. 2 a, frequency of the frequency lower than first mode 1a of the first spurious mode Sa is simultaneously lower than second
The frequency of mode 2a, this is because the first dual-mode resonator 102 is humorous less than the first bimodulus along the size of the first parasitic fields line Es
Size of the device 102 along the first electric field line E1 of shaking and the size along the second electric field line E2.In the embodiment shown in Fig. 1 b and Fig. 2 b,
Frequency of the frequency of first spurious mode Sa higher than first mode 1a and the frequency for being higher than second mode 2a, this is because first
Dual-mode resonator 102 is greater than the first dual-mode resonator 102 along the ruler of the first electric field line E1 along the size of the first parasitic fields line Es
Size very little and along the second electric field line E2.
Fig. 3 is the view of the first dual-mode resonator 102 along the first parasitic fields line Es and common central axis 126.
First stray magnetic fields vector Hs is as shown in Figure 3.The first elongated rainbow centered on common central axis 126 is also shown in Fig. 3
Film 128 and the second elongated iris 130 that setting is deviated perpendicular to the first elongated iris 128 and from common central axis 126.The
Double-mold resonator 102 has the first conductive layer 110 of covering dual-mode resonator 102.First elongated iris 128 and second is elongated
Iris 130 is the opening in conductive layer 110.As shown in figure 3, the first elongated iris 128 (in its length extending direction) at least portion
Divide ground perpendicular to the first stray magnetic fields vector Hs.Second elongated iris 130 (in its length extending direction) is at least partly parallel
In the first stray magnetic fields vector Hs.This is because caused by the second elongated iris 130 is deviated from common central axis 126.
Typically, when the width of the first elongated iris 128 is smaller, the first spurious mode and the second spurious mode pass through the
The coupling of one elongated iris 128 is the smallest.This is because along the greater depth direction (length extension) of the first elongated iris 128
There is no magnetic-field component, only small component is across short length (width extending direction), and the component is lower than the first elongated iris 128
Cutoff frequency.
Fig. 4 shows the alternative embodiment of the first dual-mode resonator 102.The embodiment in embodiment and Fig. 4 in Fig. 3 it
Between difference be that the second elongated iris 130 is located on the opposite side of the first elongated iris 128.
In Fig. 3 and two embodiments shown in Fig. 4, the first elongated iris 128 and the second elongated iris 130 are not connected.
Gap d is provided between the first elongated iris 128 and the second elongated iris 130.In a further embodiment, first is elongated
It is at T-shaped that iris 128 and the second elongated iris 130 can connect shape.It in another embodiment, can be with the general of constitutional diagram 3 and Fig. 4
It reads.In such embodiments, the first dual-mode resonator 102 tool is there are two the second elongated iris 130, one as shown in Figure 3 into
Row setting, another is configured as shown in Figure 4.And in this embodiment, the first elongated iris 128 and the second elongated iris
130 can be isolated from each other or be connected to each other and (form H-shaped).In all embodiments, although being arranged between two dual-mode resonators
Elongated iris 128,130 form mutual coupling component, (need and parasitism) mode is coupled to from the first dual-mode resonator
Second dual-mode resonator.
Fig. 5 schematically shows radio-frequency filter 100 according to an embodiment of the invention.Radio-frequency filter 100
It include: the first dual-mode resonator 102 with first mode 1a, second mode 2a and the first spurious mode Sa, wherein first pair
Mould resonator 102 includes coupling element 112 in be coupled to first mode 1a the first spurious mode Sa first；With third mould
The second dual-mode resonator 104 of formula 3b and fourth mode 4b；And it is arranged in the first dual-mode resonator 102 and the second double mode
First mode 1a is couple fourth mode 4b by mutual coupling element 106 between 104, mutual coupling element mutual coupling element 106, will
Second mode 2a is coupled to the third mode 3b, and couples the third mode 3b for the first spurious mode Sa.First spurious mode Sa
Frequency of the frequency lower than first mode 1a and be lower than the frequency of second mode 2a, this is because as shown in Fig. 1 a and Fig. 2 a,
First dual-mode resonator 102 is smaller along the size of the first parasitic fields line Es.As shown in Fig. 1 b and Fig. 2 b, the first dual-mode resonator
102 can also be larger along the size of parasitic fields line Es.In this case, the frequency of the first spurious mode Sa is higher than the first mould
The frequency of formula 1a and the frequency for being higher than second mode 2a.Coupling between the first spurious mode be not it is beneficial immediately,
Because they are dramatically different with the main two-mode resonance frequency for being used to form filter function.In fact, these undesire frequencies exist
They are often problematic when occurring and are undesirable.However, if the energy from spurious mode can be for transmission to
Adjacent cavities oscillator (such as from first the 102 to the second dual-mode resonator 104 of dual-mode resonator), then may be by the spurious resonance
It is used as shunt resonator, in order to provide diagonal cross-coupling.This concept is schematically shown in Fig. 5.First mode
Coupling between 1a and fourth mode 4b is elongated by first between the first dual-mode resonator 102 and the second dual-mode resonator 104
Iris 128 provides.Coupling and the first spurious mode Sa and the third mode 3b between second mode 2a and the third mode 3b it
Between coupling provided by the second elongated iris 130128 between the first dual-mode resonator 102 and the second dual-mode resonator 104.The
One elongated iris 128 and the second elongated iris 130 will be explained in further detail below.Coupling element 154 is by first in third
Mode 1a is coupled to second mode 2a.The third mode 3b is coupled to fourth mode 4b by coupling element 156 in 4th.Coupling in third
Closing coupling element 156 in element 154 and the 4th will be explained in further detail below.
Fig. 6 shown the first dual-mode resonator 102 that radio-frequency filter 100 is set and the second dual-mode resonator 104 it
Between mutual coupling element 106 (being formed by above-mentioned elongated iris 128,130) concept.Radio-frequency filter 100 includes first pair
Mould resonator 102 and the second dual-mode resonator 104.First dual-mode resonator 102 and the second dual-mode resonator 104 are respective with its
Center is arranged along common central axis 126.Mutual coupling element 106 includes first elongated centered on common central axis 126
Iris 128 and the second elongated iris 130 for being arranged and being deviated from common central axis 126 perpendicular to the first elongated iris 128
Setting.First parasitic fields vector Es is parallel to common central axis.First elongated iris 128 and the second elongated 130 phase of iris
It is d away from distance.First stray magnetic fields vector Hs is oriented around the first parasitic fields vector Es.Therefore, the first parasitic fields vector
Es is arranged essentially parallel to the second elongated iris 130.Along common central axis 126, the magnetic field strength of the first spurious mode Sa is in
Its minimum value, and the electric field strength of the first spurious mode Sa is in its maximum value.
Second elongated iris 130 is inclined from common central axis 126 on the direction of the length component of the first elongated iris 128
It moves, wherein gap is arranged between the first elongated iris 128 and the second elongated iris 130.
The length component of first elongated iris 128 is parallel to the electric field intensity E2 setting of second mode 2a.Second elongated rainbow
The length component of film 130 is parallel to the electric field intensity E1 setting of first mode 1a.The length component of first elongated iris 128 is parallel
It is arranged in the electric field intensity E3 of the third mode 3b.The length component of second elongated iris 130 is parallel to the electric field of fourth mode 4b
Vector setting.This allow via the first elongated iris 128 by first mode 1a be coupled to fourth mode 4b and via second it is thin
Second mode 2a is coupled to the third mode 3b by long iris 130.In addition, via the second elongated iris 130 by the first spurious mode
Sa is coupled to the third mode.
By deviateing center (i.e. common central axis 126), the second elongated iris 130 is provided between mode 2a and mode 3b
Coupling, magnetic flux vector of the magnetic flux vector from the first spurious mode Sa substantially with the second elongated iris 130 and mode 3b
The two alignment.
Interior coupling element is not shown in Fig. 6.These will be associated with Fig. 8 and Figure 10 to Figure 13 and show and describe.Interior coupling
Close the mode in element coupling dual-mode resonator 102.
Fig. 7 is view of first dual-mode resonator along common central axis.In Fig. 7, the first stray magnetic fields vector Hs and
Third magnetic vector H3 is shown as substantially parallel to each other at the second elongated iris 130.
Fig. 8 shows the embodiment of radio-frequency filter 100.The feature not being described referring to Fig. 6 is only described.Fig. 8's
In embodiment, the first elongated iris 128 and the second elongated iris 130 are connected to each other and are formed together T.As it was earlier mentioned, two
Elongated iris 128 and 130 is formed together mutual coupling element 106.It is also shown in Fig. 8 and the first dual-mode resonator 102 is set
Coupling element 112 in first at borderline region between first side 134 and second side 136, it is parasitic in the borderline region, first
Mode S a and the magnetic field line of first mode 1a are at least partly parallel.Coupling element 112 is in the embodiment shown in fig. 8 in first
It is recess.Because the first spurious mode Sa is obviously separated with holotype in frequency, big chamfering/notch/recess is needed
To couple enough energy between modes.In this way, recess cutting better than the whole length along the first dual-mode resonator 102
Mouth or chamfering, because it significantly reduces the parasitic couplings or interaction between other modes in resonance block, so as to
Use these feature careful design filters.
First dual-mode resonator 102 includes that first mode 1a is coupled to coupling element 154 in the third of second mode 2a.
The borderline region between second side 136 and third side 168 of the first dual-mode resonator 102 is arranged in coupling element 154 in third
Place, in the borderline region, first mode 1a (Fig. 5) and the magnetic field line of second mode 2a (Fig. 5) are at least partly parallel.This is
The vantage point of coupling element in three, to obtain the high coupling efficiency between first mode 1a and second mode 2a.In Fig. 8 institute
In the embodiment shown, coupling element 154 is in form of cut or cuts in third.
Second dual-mode resonator 104 includes that the third mode 3b is coupled to coupling element 156 in the 4th of fourth mode 4b.
The borderline region between the first side 158 of the second dual-mode resonator 104 and second side 160 is arranged in coupling element 156 in 4th
Place.In the borderline region, the third mode 3b and the magnetic field line of fourth mode 4b are at least partly parallel.This is coupling member in the 4th
The vantage point of part 156, to obtain the high coupling efficiency between the third mode 3b and fourth mode 4b.Reality shown in Fig. 8
It applies in example, coupling element 156 is in form of cut or cuts in the 4th.
Fig. 9 shows the coupled characteristic by the mutual coupling element 106 in the radio-frequency filter in Fig. 8, dependent on the
Position of the two elongated irises 130 relative to common central axis 126.Coupled characteristic is indicated on the vertical axis with MHz.Solid line is shown
The different length L2 (Fig. 3, Fig. 4) of iris 130 elongated for second, between the first spurious mode Sa and the second spurious mode Sb
Coupling efficiency.Dotted line describes the different length L2 (Fig. 3, Fig. 4) of iris 130 elongated for second, second mode 2a and
Coupling between three mode 3b.For convenience's sake, the coupling effect of the first spurious mode Sa to the second spurious mode Sb is shown
Rate, because two resonance are in identical frequency.Even at different frequencies, the first spurious mode Sa is to the third mode 3b's
Couple it is proportional to the coupling of the first spurious mode Sa to the second spurious mode Sb, and to the position of iris with it is similar according to
Lai Xing.It is obvious that although the magnetic flux density of mode 3b is on iris cross section substantially uniformly and for all iris bridge locations
Amplitude having the same is set, but the flux component of spurious mode Sa is not such.Therefore, with the second elongated iris 130
Further mobile from common central axis 126, the amplitude of the coupling from Sa to 3b will correspondingly increase, this is apparent in Fig. 9
And it is shown.Further, since spurious mode Sa has the vertical component and water of flux in the either side of common central axis 126
The amount of dividing equally, move in one direction mutual coupling element 106 will lead to it is obtained relative to it is moved in the other directions
Opposite symbol coupling.
Another advantage of the elongated iris 130 of mobile second is, due to the magnetic of second mode 2a and the third mode 3b
Field vector has constant amplitude and direction, institute 2a and the third mode 3b in a second mode for the position of all irises
Between stiffness of coupling be constant for its position.This means that main coupling from second mode 2a to the third mode 3b can be with
It is controlled by changing the length L2 (Fig. 3, Fig. 4) of the second elongated iris 130, and the first spurious mode and the second spurious mode
Between coupling can be controlled by the position of the second elongated iris, thus allow according to two couplings of single feature independent control
It closes.
Figure 10 schematically shows the radio-frequency filter 100 of alternate embodiment according to the present invention.It will only describe
The difference between the embodiment in embodiment and Figure 10 in Fig. 8.In Figure 10, coupling element 154 has been set in third
On the opposite side of second side 136, in the opposite side of second side 136, the magnetic field line at least portion of first mode 1a and second mode 2a
Divide ground parallel.
Figure 11 schematically shows the radio-frequency filter 100 of alternate embodiment according to the present invention.It will only describe
The difference between the embodiment in embodiment and Figure 11 in Figure 10.In Figure 11, coupling element 112 has been set in first
On the opposite side of first resonator 102, in the opposite side of the first resonator 102, first mode 1a and the first spurious mode Sa's
Magnetic field line is at least partly parallel.
Figure 12 schematically shows the radio-frequency filter 100 of alternate embodiment according to the present invention.It will only describe
The difference between the embodiment in embodiment and Figure 12 in Figure 11.In Figure 12, it is thin that the second elongated iris 130 is placed on first
On the opposite side compared with the preceding embodiment in Figure 11 of long iris 128.
Operation according to the radio-frequency filter 100 of the embodiment of Fig. 8 and Figure 10 to Figure 12 is as follows.To the first dual-mode resonator
102 feeding electromagnetic waves, the electromagnetic wave will arrive first mode 1a by filtering.Coupling element 112 will be provided from the first mould in first
The coupling of formula 1a to the first spurious mode Sa, and coupling element 154 will be provided from first mode 1a to second mode in third
The coupling of 2a.Then, mutual coupling element 106 will be provided from first mode 1a to the coupling of fourth mode 4b, from the first parasitic mode
The coupling of formula Sa to the third mode 3b and from second mode 2a to the coupling of the third mode 3b.More specifically, first is elongated
Iris 128 is provided from first mode 1a to the coupling of fourth mode 4b, and the second elongated iris 130 provide second mode 2a and
The coupling between coupling and the first spurious mode Sa and the third mode 3b between the third mode 3b.Finally, coupling in the 4th
Element 156 will provide coupling from the third mode 3b to fourth mode 4b.First mode 1a, second mode 2a, the third mode 3b
Filter passband is formed together with fourth mode 4b.The frequency of first spurious mode Sa and the frequency of the second spurious mode Sb are being filtered
Except wave device passband.
Figure 13 schematically shows the first dual-mode resonator 102 with coupling element 154 in various forms of thirds.
Compared with coupling element 154 in above-mentioned third, coupling element 154 is in the form of overall length chamfering in the third in Figure 13.
Figure 14 to Figure 18 shows the filter of different embodiment according to the subject invention realized using radio-frequency filter 100
The different examples of function.Different filter functions will be made by the transmission (as unit of dB) of different radio-frequency filters 100
It is shown for frequency (as unit of GHz) function.Filter function will transmit s21 (using as unit of dB) as frequency (with GHz for list
Position) function show.Single transmission zero or transmission zero shown in Figure 14 to Figure 18 are to can use circuit topology and slot inclined
The many various combinations moved are formed --- and it is not specific to position required slot offset or recess positioning for given transmission zero
Position --- this depends on complete circuit.In Figure 14 into Figure 18, solid line and dotted line are shown with recess and offset parameter
Change obtainable typical change, that is, transmission zero location can be controlled by design.
Figure 14 shows an example of the strong and weak inductance triplet realized according to one embodiment of present invention.From
As can be seen that filter function is on transmision peak has transmission decline in Figure 14.
Figure 15 shows an example of the strong and weak capacitor triplet realized according to one embodiment of present invention.From
As can be seen that filter function is under transmision peak has transmission decline in Figure 15.
Figure 16 shows an example of the strong and weak inductance quartet realized according to one embodiment of present invention.From
As can be seen that filter function has on transmision peak, there are two transmission declines in Figure 16.
Figure 17 shows an examples of the strong and weak inductance triplet realized according to one embodiment of present invention.From
As can be seen that filter function has under transmision peak, there are two transmission declines in Figure 17.
Figure 18 shows an example of the strong and weak capacitor quartet realized according to one embodiment of present invention.From
As can be seen that filter function is under transmision peak has a transmission decline in Figure 18, have one on transmision peak
A transmission decline.Figure 18 is shown about the inclined example of apparent high side and downside.
Figure 19 schematically shows the radio-frequency filter 100 according to an alternate embodiment.Radio-frequency filter 100 wraps
It includes: the first dual-mode resonator 102 with first mode 1a, second mode 2a and the first spurious mode Sa, wherein the first bimodulus
Resonator 102 includes coupling element 112 in be coupled to mode 1a the first spurious mode Sa first；With the third mode 3b,
The second dual-mode resonator 104 of fourth mode 4b and the second spurious mode Sb；And setting is in the first dual-mode resonator 102 and the
First mode 1a is coupled to fourth mode 4b by the mutual coupling element 106 between two dual-mode resonators 104, mutual coupling element 106,
Second mode 2a is coupled to the third mode 3b, and the first spurious mode Sa is coupled to the second spurious mode Sb.Second pair
Mould resonator 104 has the second spurious mode Sb, and including the second spurious mode Sb is coupled to the second of the third mode 3b
Interior coupling element 132.First parasitic fields vector Es is parallel to common central axis 126 (as shown in figure 20).First elongated rainbow
Film 128 and the second elongated 130 distance of iris are d.First stray magnetic fields vector Hs takes around the first parasitic fields vector Es
To.Therefore, the first parasitic fields vector is substantially perpendicular to the second elongated iris 130.It is parasitic along common central axis, first
The magnetic field strength of Mode S a is in its minimum value, and the electric field strength of the first spurious mode Sa is in its maximum value.First mould
Coupling between formula 1a and fourth mode 4b is provided by the first elongated iris 128.Between second mode 2a and the third mode 3b
Coupling and the coupling between the first spurious mode Sa and the second spurious mode Mode S b are thin by the second elongated iris 130 and third
Long iris 138 provides.Reference Figure 20 is further explained in detail to the first elongated iris 128, second to form mutual coupling element 106
Elongated iris 130 and the elongated iris 138 of third.First mode 1a is coupled to second mode 2a by coupling element 154 in third.The
The third mode 3b is coupled to fourth mode 4b by coupling element 156 in four.It will be explained in third in further detail referring to Figure 20
Coupling element 156 in coupling element 154 and the 4th.
Figure 20 shows the radio-frequency filter 100 according to the embodiment of Figure 19.First dual-mode resonator 102 is situated between including solid-state
First conductive layer 110 of the first integral blocks 108 of the first integral blocks 108 and covering of electric material, and the second dual-mode resonator 104
Second conductive layer 116 of the second integral blocks 114 of the second integral blocks 114 and covering including solid dielectric material.First integral blocks
108, the second integral blocks 114 and coupling element 106 are formed together integral unit, can contribute to the manufacture of radio-frequency filter.
First dual-mode resonator 102 and the second dual-mode resonator 104 with by its respective center along common central axis 126
Setting.Mutual coupling element 106 includes the first elongated iris 128 centered on common central axis 126, elongated perpendicular to first
The elongated iris 130 and the elongated iris 138 of third iris 128 setting and deviated from common central axis 126, the third
Elongated iris 138 is parallel to the second elongated iris 130 and is arranged, and the phase in central axis 126 relative to the second elongated iris 130
It is deviated on opposite side from central axis 126.First spurious mode Sa is coupled to the second spurious mode Sb by the second elongated iris 130.The
First spurious mode Sa is coupled to the second spurious mode Sb by three elongated irises 138.Therefore, the second elongated iris 130 and third
First spurious mode Sa is all coupled to the third mode 3b by elongated iris 138.The magnetic vector of first spurious mode Sa is around altogether
With central axis 126 rotate, and the electric field intensity of the third mode 3b is orthogonal with common central axis 126 (but in same plane
In).This means that the second elongated iris 130 will be helpful to just couple, and the elongated iris 138 of third will be helpful to negative coupling.Such as
The elongated iris 130 of fruit second and the elongated iris 138 of third are located in away from the common identical distance of central axis 126, then and second
The contribution of elongated iris 130 will offset the contribution of the elongated iris 130 of third.
The magnetic vector of first spurious mode Sa and the magnetic vector of the second spurious mode Sb are around common central axis
126。
Coupling element 112 is arranged between the 5th side 170 and the 6th side 172 of the first dual-mode resonator 102 in first
Borderline region at, in the borderline region, the first spurious mode Sa and the magnetic field line of first mode 1a are at least partly parallel.The
Coupling element 112 is recess in the embodiment shown in Figure 20 in one.Because spurious mode is obviously divided with holotype in frequency
From so needing big chamfering/notch/recess to couple enough energy between modes.In this way, recess is better than along first
The notch or chamfering of the whole length of dual-mode resonator 102, because it causes to significantly reduce between other modes in resonance block
Parasitic couplings or interaction, so as to use these feature careful design filters.
Coupling element 132 is arranged between the first side 158 of the second dual-mode resonator 104 and third side 162 in second
Borderline region at, in the borderline region, the second spurious mode Sa and the magnetic field line of the third mode 3b are at least partly parallel.The
Coupling element 132 is recess in the embodiment shown in Figure 20 in two, and reason is identical as coupling element in first.
First dual-mode resonator 102 includes that first mode 1a is coupled to coupling element 154 in the third of second mode 2a.
Coupling element 154 is arranged on the frontier district between second side 136 and the 4th side 140 of the first dual-mode resonator 102 in third
At domain, in the borderline region, first mode and the magnetic field line of second mode are at least partly parallel.This is coupling element in third
Vantage point, to obtain the high coupling efficiency between first mode and second mode.In the embodiment shown in Figure 20,
Coupling element is in the form of notch in three.
Second dual-mode resonator 104 includes that the third mode 3b is coupled to coupling element 156 in the 4th of fourth mode 4b.
Coupling element 156 is arranged on the frontier district between the first side 158 of the second dual-mode resonator 104 and second side 160 in 4th
At domain, in the borderline region, the third mode 3b and the magnetic field line of fourth mode 4b are at least partly parallel.This is coupling in the 4th
The vantage point of element 156, to obtain the high coupling efficiency between the third mode 3b and fourth mode 4b.Shown in Figure 20
In embodiment, coupling element 156 is in the form of notch in the 4th.
In operation, electromagnetic wave is fed to the first dual-mode resonator 102, the electromagnetic wave will arrive first mode by filtering
1a.Coupling element 112 will provide coupling from first mode 1a to the first spurious mode, and coupling element in third in first
Coupling from first mode 1a to second mode 2a will be provided.Then, mutual coupling element 106 will be provided from first mode 1a to
The coupling of four mode 4b, from the first spurious mode Sa to the coupling of the second spurious mode Sb and from second mode 2a and third mould
The coupling of formula 3b.More specifically, the first elongated iris 128 provides the coupling between first mode 1a and fourth mode 4b, and
And second elongated iris 130 and third elongated iris 138 coupling between second mode 2a and the third mode 3b and the are provided
Coupling between one spurious mode Sa and the second spurious mode Sb.Finally, coupling element 132 will be provided from the second parasitism in second
The coupling of Mode S b to the third mode 3b, and coupling element 156 will be provided from the third mode 3b to fourth mode 4b in the 4th
Coupling.First mode 1a, second mode 2a, the third mode 3b and fourth mode 4b are formed together filter passband.First posts
The frequency of raw Mode S a and the frequency of the second spurious mode Sb are except filter passband.
Figure 21 schematically shows the communication equipment 300 in wireless communication system 400.Communication equipment 300 includes basis
The radio-frequency filter 100 of the embodiment of the present invention.Wireless communication system 400 further includes base station 500, which also can wrap
Include the radio-frequency filter 100 according to any of the above embodiments.Dotted arrow A1 is indicated from transmitter device 300 to base station
500 transmission, commonly known as uplink transmission.Complete arrow A2 is indicated from base station 500 to the biography of transmitter device 300
It is defeated, commonly known as downlink transmission.
This communication equipment 300 can be the user equipment (User in long term evolution (Long Term Evolution, LTE)
Equipment, UE), mobile station (mobile station, MS), wireless terminal or can wireless communication system (sometimes also by
Referred to as cellular radio system) in any one of the mobile terminal that carries out wireless communication.UE can be further referred as moving
Mobile phone, cellular phone, computer tablet computer or the laptop with wireless performance.UE herein may, for example, be
It can be via radio access network and another entity (such as another receiver or server) transmission voice or data
Mobile device that portable, pocket, hand-held, computer include or vehicle-mounted.UE can be station (Station, STA), should
Station is the media access control (Media Access Control, MAC) comprising meeting IEEE 802.11 and to wireless medium
Any equipment of physical layer (Physical Layer, the PHY) interface of (Wireless Medium, WM).
This communication equipment 300 can also be base station (radio) network node or access node or access point or base station, example
Such as radio base station (Radio Base Station, RBS), be referred to alternatively as in some networks transmitter, " eNB ",
" eNodeB ", " NodeB " or " B node ", this depends on used technology and term.Based on transmission power and hereby based on
Cell size, radio network node can have different classifications, such as macro eNodeB, family eNodeB or femto base station.
Radio network node can be station (STA), which is the media access control (MAC) comprising meeting IEEE 802.11 and arrives
Any equipment of physical layer (PHY) interface of wireless medium (WM).
Claims (18)
1. a kind of radio-frequency filter (100), comprising:
The first dual-mode resonator (102) with first mode (1a), second mode (2a) and the first spurious mode (Sa), wherein
First dual-mode resonator (102) includes first that the first mode (1a) is coupled to first spurious mode (Sa)
Interior coupling element (112)；
The second dual-mode resonator (104) with the third mode (3b) and fourth mode (4b)；And
Mutual coupling element between first dual-mode resonator (102) and second dual-mode resonator (104) is set
(106), the first mode (1a) is coupled to the fourth mode (4b) by the mutual coupling element (106), by described second
Mode (2a) is coupled to the third mode (3b), and first spurious mode (Sa) is coupled to the third mode
(3b)。
2. radio-frequency filter (100) according to claim 1,
Wherein first dual-mode resonator (102) and second dual-mode resonator (104) are with its respective center along common
Central axis (126) setting；
Wherein the mutual coupling element (106) includes the first elongated iris centered on the common central axis (126)
(128) and perpendicular to the described first elongated iris (128) and the second elongated rainbow for being deviated from the common central axis (126)
Film axis (130).
3. radio-frequency filter (100) according to claim 2,
Wherein, along the common central axis (126), the magnetic field strength of first spurious mode (Sa) is in its minimum value simultaneously
And the electric field strength of first spurious mode (Sa) is in its maximum value.
4. radio-frequency filter (100) according to claim 2 or 3,
Wherein the described second elongated iris (130) is on the direction of the length component of the described first elongated iris (128) from described
Common central axis (126) offset；
Wherein the described first elongated iris (128) and the second elongated iris (130) are connected to each other, or thin described first
Gap is set between long iris (128) and the second elongated iris (130).
5. according to radio-frequency filter (100) described in claim 2,3 or 4,
Wherein the electric field intensity of the length component Yu the second mode (2a) of the described first elongated iris (128) is flat
Row setting；
Wherein the electric field intensity of the length component Yu the first mode (1a) of the described second elongated iris (130) is flat
Row setting.
6. radio-frequency filter (100) according to any one of the preceding claims,
Wherein in described first coupling element (112) setting in the first side (134) of first dual-mode resonator (102) and the
At borderline region between two sides (136), in the borderline region, first spurious mode (Sa) and the first mode
The magnetic field line of (1a) is at least partly parallel.
7. radio-frequency filter (100) according to claim 6,
Wherein coupling element (112) is recess (120), at least one local chamfering (122) and at least one office in described first
One in portion's notch (124).
8. radio-frequency filter (100) according to claim 6 or 7, wherein second dual-mode resonator (104) has
Second spurious mode (Sb), and including second spurious mode (Sb) to be coupled in the second of the third mode (3b)
Coupling element (132).
9. radio-frequency filter (100) according to claim 8, wherein coupling element (132) is recess in described second
(120), one at least one local chamfering (122) and at least one partial cut-out (124).
10. the radio-frequency filter (100) according to any one of claim 8 or 9, wherein the mutual coupling element (106)
First spurious mode (Sa) is also coupled to second spurious mode (Sb).
11. radio-frequency filter (100) according to claim 10, wherein the mutual coupling element (106) includes that third is thin
Long iris (138), the elongated iris of third (138) are parallel to the described second elongated iris (130) setting, and in described
Mandrel (126) is relative to mobile from the central axis (126) on the opposite side of the described second elongated iris (130).
12. the radio-frequency filter according to any one of claim 8 to 11 (100), wherein the first mode (1a), institute
It states second mode (2a), the third mode (3b) and the fourth mode (4b) and is formed together filter passband, and wherein
The frequency of first spurious mode (Sa) and the frequency of second spurious mode (Sb) are except the filter passband.
13. the radio-frequency filter according to any one of claim 8 to 12 (100), wherein first spurious mode
(Sa) at least one of described electric field intensity and the electric field intensity of second spurious mode (Sb) are parallel to described
Common central axis (126).
14. radio-frequency filter (100) according to any one of the preceding claims, wherein first dual-mode resonator
It (102) include that the first mode (1a) is coupled to coupling element (154) in the third of the second mode (2a).
15. radio-frequency filter (100) according to any one of the preceding claims, wherein second dual-mode resonator
It (104) include that the third mode (3b) is coupled to coupling element (156) in the 4th of the fourth mode (4b).
16. radio-frequency filter (100) according to any one of the preceding claims, wherein first dual-mode resonator
It (102) include the first integral blocks (108) of solid dielectric material and the first conductive layer for covering first integral blocks (108)
(110), also, wherein second dual-mode resonator (104) includes the second integral blocks (114) and the covering of solid dielectric material
The second conductive layer (116) of second integral blocks (114).
17. radio-frequency filter (100) according to claim 15 or 16, wherein first integral blocks (108), described
Second integral blocks (114) and the coupling element (106) are formed together integral unit.
18. one kind is used for the communication equipment of wireless communication system (400), the communication equipment (300) includes according to aforementioned right
It is required that any one of described in radio-frequency filter (100).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2016/063631 WO2017215742A1 (en) | 2016-06-14 | 2016-06-14 | Radio frequency filter |
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| Publication Number | Publication Date |
|---|---|
| CN109155450A true CN109155450A (en) | 2019-01-04 |
| CN109155450B CN109155450B (en) | 2020-02-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201680085836.3A Active CN109155450B (en) | 2016-06-14 | 2016-06-14 | Radio frequency filter |
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|---|---|
| CN (1) | CN109155450B (en) |
| WO (1) | WO2017215742A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022110987A1 (en) * | 2020-11-27 | 2022-06-02 | Telefonaktiebolaget Lm Ericsson (Publ) | Dielectric filter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| RU197717U1 (en) * | 2020-01-29 | 2020-05-25 | Акционерное общество «Российская корпорация ракетно-космического приборостроения и информационных систем» (АО «Российские космические системы») | Microwave filter |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4675630A (en) * | 1985-01-14 | 1987-06-23 | Com Dev Ltd. | Triple mode dielectric loaded bandpass filter |
| CN1492535A (en) * | 2002-10-23 | 2004-04-28 | ���ߵ���Ƶϵͳ��˾ | Medium single block double mold microwave delay filter |
-
2016
- 2016-06-14 WO PCT/EP2016/063631 patent/WO2017215742A1/en active Application Filing
- 2016-06-14 CN CN201680085836.3A patent/CN109155450B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4675630A (en) * | 1985-01-14 | 1987-06-23 | Com Dev Ltd. | Triple mode dielectric loaded bandpass filter |
| CN1492535A (en) * | 2002-10-23 | 2004-04-28 | ���ߵ���Ƶϵͳ��˾ | Medium single block double mold microwave delay filter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022110987A1 (en) * | 2020-11-27 | 2022-06-02 | Telefonaktiebolaget Lm Ericsson (Publ) | Dielectric filter |
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| Publication number | Publication date |
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| CN109155450B (en) | 2020-02-21 |
| WO2017215742A1 (en) | 2017-12-21 |
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