CN105896002A - Harmonic-suppression differential band-pass filter - Google Patents
Harmonic-suppression differential band-pass filter Download PDFInfo
- Publication number
- CN105896002A CN105896002A CN201610290803.4A CN201610290803A CN105896002A CN 105896002 A CN105896002 A CN 105896002A CN 201610290803 A CN201610290803 A CN 201610290803A CN 105896002 A CN105896002 A CN 105896002A
- Authority
- CN
- China
- Prior art keywords
- resonator
- medium
- difference
- differential
- coaxial
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- H01P1/2002—Dielectric waveguide filters
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention discloses a harmonic-suppression differential band-pass filter based on mixed media and an coaxial resonator and solves the problem that a differential filter based on a dielectric resonator in the prior art has poor harmonic wave performance such as a low differential mode stop band width and a low common mode rejection level. The filter disclosed by the invention comprises a metal chamber, two dielectric resonators and one coaxial resonator, two differential excitation structures and multiple microwave coaxial joints, wherein the two differential excitation structures are firmly disposed beside the two dielectric resonators respectively, have a one-to-one correspondence relation, and carry out excitation coupling with the two dielectric resonators according to the Ampere's right handed screw rule; the multiple microwave coaxial joints are disposed on the outer wall of the metal chamber, connected to the two differential excitation structures and used for connection with external communication equipment; and one of the two differential excitation structures is a differential excitation signal input structure, and the other differential excitation structure is a differential excitation signal output structure. The filter disclosed by the invention can improve harmonic wave performance of the differential filter based on the dielectric resonator, which is specifically embodied in increase of the differential mode stop band width and the common mode rejection level.
Description
Technical field
The present invention relates to radio communication technical field of filtering, particularly relate to a kind of based on blending agent with the most humorous
Shake the harmonics restraint differential bandpass filter of device.
Background technology
In recent decades, dielectric resonator relies on its high quality factor value (Q), low manufacturing cost, high-temperature
The advantageous characteristic such as stability are applied in various microwave components and subsystem more and more widely, particularly at height
In performance band filter.But, dielectric resonator, due to crowded mode of resonance, causes and undesirably occurs
Harmonic mode and required mode of operation at a distance of the tightst, cause dielectric filter to have poor humorous
Wave property.But, many communication system requirements wave filter can realize secondary or the suppression of triple-frequency harmonics pattern.
At present, in order to improve the harmonic performance of dielectric filter, many research worker are by taking some measures
Carry out harmonics restraint.Such as, a hole is introduced at the center of dielectric resonator, to improve main mould and high order
The separation degree of pattern, but filter stop bend expansion capability is the most limited；The scholars such as Nishikawa propose
The viewpoint of " 1/4th forms of a dielectric resonator can improve wave filter harmonic performance further ",
But the design of wave filter can become the most complicated.
It addition, in less radio-frequency/microwave system, difference channel is most important, this is owing to it is at severe ring
Border has the ability of the highest noise resistance and electromagnetism interference.Functional as most important radio-frequency front-end
One of passive device, differential bandpass filter has played pivotal role and has been widely used in Modern Communication System
In.In order to comply with this development trend, some research worker utilize dielectric resonator to devise difference filter,
Effectively demonstrate dielectric resonator development potentiality in difference channel is applied.But the studies above does not accounts for
To the problem of harmonics restraint, which results in wave filter differential mode stopband and common mode inhibition level does not reaches satisfactory
Stage.
Summary of the invention
The present invention is directed to present in prior art, difference filter harmonic performance based on dielectric resonator is poor
Problem, as the highest in differential mode stopband and common mode inhibition level, it is provided that a kind of harmonics restraint difference bandpass filtering
Device, it is possible to improve the harmonic performance of difference filter based on dielectric resonator, it is poor to be embodied in raising
Mould resistance band and common mode inhibition level.
Embodiments providing a kind of harmonics restraint differential bandpass filter, described wave filter includes:
Metallic cavity；
First medium resonator, coaxial resonator and the second medium being fixedly installed in described metallic cavity
Resonator；Wherein, described first medium resonator and described second medium resonator are about described the most humorous
The device that shakes is symmetrical, and the main mould of described first medium resonator and described second medium resonator is TE01δMould or
TE11δMould, the main mould of described coaxial resonator is TEM basic mode, described TE01δMould or TE11δMould and described
The resonant frequency of TEM basic mode is identical；
It is fixedly installed on described first medium resonator side, passes through ampere with described first medium resonator
First difference incentive structure of right-hand screw rule excitation coupling；It is fixedly installed on described second medium resonance
Device side, encourages, with described second medium resonator, the second difference coupled by ampere's right handed screw rule
Incentive structure；Described first difference incentive structure and described second difference incentive structure are symmetricly set on described
In metallic cavity；
It is arranged on the outer wall of described metallic cavity, with described first difference incentive structure and described second poor
Incentive structure correspondence is divided to connect, for the multiple microwave coaxial joints being connected with external communication device；
Wherein, one in described first difference incentive structure and described second difference incentive structure is
The difference pumping signal input structure of described wave filter, and the difference excitation letter that another is described wave filter
Number export structure.
Optionally, described first medium resonator and described second medium resonator respectively annular medium is humorous
Shake device or Rectangular Enclosure with Participating Media resonator；Described coaxial resonator is metal coaxial resonator.
Optionally, the axial and described second medium resonator of described first medium resonator is the most flat
OK；Described first medium resonator axially and described coaxial resonator axially vertical.
Optionally, described first difference incentive structure includes symmetrically arranged first feed probes of minute surface and
Two feed probes；Described first feed probes is specially the horizontal cross-section with described first medium resonator
The circular arc needle body that face is concentric and the number of degrees are less than 90 °, for right by ampere with described first medium resonator
The excitation coupling of hands screw rule；
Described second feed probes is identical with described first feed probes structure, described second difference excitation knot
Structure and described first difference incentive structure have identical structure.
Optionally, described first feed probes and described second feed probes difference under differential mode duty
Introducing the first electric current and the second electric current, described first electric current is identical with the size of described second electric current and direction
On the contrary, described first electric current and described second electric current encourage described first medium resonator for difference.
Optionally, the plurality of microwave coaxial joint is specially four, four microwave coaxial joints one a pair
Should be connected with four feed probes of described first difference incentive structure and described second difference incentive structure；
Each joint in described four microwave coaxial joints includes: with a feedback in described four feed probes
The inner wire that electric probe is connected, and the outer conductor being connected with described metallic cavity outer wall.
Optionally, described wave filter also includes: mate with described metallic cavity, is located at described gold for lid
Belong to the crown cap on cavity；
It is arranged on described crown cap inner face, with described first medium resonator and described second medium resonance
The device dish of first medium tuning one to one and second medium tuning dish, be respectively used to regulate described first and be situated between
Matter resonator and the resonant frequency of described second medium resonator, so that described first medium resonator is humorous
Vibration frequency, the resonant frequency phase of resonant frequency and described coaxial resonator of described second medium resonator
Deng；
Wherein, described crown cap inner face is specially the face that described crown cap is relative with described metallic cavity.
Optionally, described metallic cavity includes the first chamber, the second chamber and the 3rd chamber；Described first
Dielectric resonator is arranged in described first chamber, and described coaxial resonator is arranged on described second chamber
In, described second medium resonator is arranged in described 3rd chamber；
The first spaced walls, described first spaced walls it is provided with between described first chamber and described second chamber
On dig the first coupling window being communicated with two chambers so that described first medium resonator and described coaxially
The magnetic field of resonator can intercouple；It is provided with second between described second chamber and described 3rd chamber
Spaced walls, described second spaced walls is dug the second coupling window being communicated with two chambers, so that described
The magnetic field of second medium resonator and described coaxial resonator can intercouple.
Optionally, one end of described coaxial resonator is fixedly installed on the first side wall of described metallic cavity
On, described first coupling window and described second coupling window are separately positioned on described first spaced walls and described
The side of the close described the first side wall of two spaced walls.
Optionally, described wave filter also includes: be fixedly installed on the first pedestal bottom described metallic cavity
With the second pedestal, it is respectively used to carry described first medium resonator and described second medium resonator；Institute
Stating the first pedestal to be arranged in described first chamber, described second pedestal is arranged in described 3rd chamber；
Described first medium resonator and described second medium resonator rational height phase in described metallic cavity
With.
The one or more technical schemes provided in the present invention, at least have the following technical effect that or advantage:
Due in the present invention, by be fixedly installed in a metallic cavity in described metallic cavity
One dielectric resonator, coaxial resonator and second medium resonator；Wherein, described first medium resonator
Symmetrical about described coaxial resonator with described second medium resonator, described first medium resonator and institute
The main mould stating second medium resonator is TE01δMould or TE11δMould, the main mould of described coaxial resonator is
TEM basic mode, described TE01δMould or TE11δMould is identical with the resonant frequency of described TEM basic mode；Fix and set
Put at described first medium resonator side, fixed by ampere right-handed helix with described first medium resonator
Then encourage the first difference incentive structure of coupling；It is fixedly installed on described second medium resonator side, with
Described second medium resonator is by the second difference incentive structure of ampere's right handed screw rule excitation coupling；
Described first difference incentive structure and described second difference incentive structure are symmetricly set on described metallic cavity
In；It is arranged on the outer wall of described metallic cavity, with described first difference incentive structure and described second poor
Incentive structure correspondence is divided to connect, for the multiple microwave coaxial joints being connected with external communication device；Its
In, one in described first difference incentive structure and described second difference incentive structure is described filter
The difference pumping signal input structure of ripple device, and the difference pumping signal output that another is described wave filter
Structure.Differential bandpass filter in the present invention is a third order difference band filter, is used in mixed way Jie
Matter resonator and coaxial resonator, same by introducing in differential bandpass filter based on dielectric resonator
Axle resonator, numerous harmonic waves of suppression dielectric resonator so that this differential bandpass filter can obtain relatively
Wide differential mode stopband and common mode inhibition.Efficiently solve difference based on dielectric resonator in prior art
The problem of wave filter harmonic performance difference, as the highest in differential mode stopband and common mode inhibition level, improve based on medium
The harmonic performance of the difference filter of resonator, is embodied in and improves its differential mode resistance band and common mode presses down
Controlling the water circulation is put down.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to enforcement
In example or description of the prior art, the required accompanying drawing used is briefly described, it should be apparent that, describe below
In accompanying drawing be only embodiments of the invention, for those of ordinary skill in the art, do not paying wound
On the premise of the property made work, it is also possible to obtain other accompanying drawing according to the accompanying drawing provided.
The first harmonic wave based on dielectric resonator and coaxial resonator that Fig. 1 provides for the embodiment of the present invention presses down
The structural representation of differential bandpass filter processed；
Fig. 2 A is carried in metallic cavity annular dielectric resonator TE for what the embodiment of the present invention provided01δMould
Magnetic distribution schematic diagram；
Fig. 2 B is carried in metal coaxial resonator TEM basic mode in metallic cavity for what the embodiment of the present invention provided
Magnetic distribution schematic diagram；
Excitation is imitated by the annular dielectric resonator that Fig. 3 A provides for the embodiment of the present invention by two groups of differential probe
True frequency response chart；
The metal coaxial resonator that Fig. 3 B provides for the embodiment of the present invention is by the emulation of two single-ended probe excitations
Frequency response chart；
The feed probes difference incentive structure that Fig. 4 provides for the embodiment of the present invention and the knot of annular dielectric resonator
Structure schematic diagram；
The second harmonic wave based on dielectric resonator and coaxial resonator that Fig. 5 provides for the embodiment of the present invention presses down
The structural representation of differential bandpass filter processed；
The differential bandpass filter when crown cap lid is located in metallic cavity that Fig. 6 provides for the embodiment of the present invention
The high side cross-sectional view of width；
The structural representation that dielectric tuning dish is set on crown cap inner face that Fig. 7 provides for the embodiment of the present invention
Figure；
The spacing when dielectric tuning dish with annular dielectric resonator that Fig. 8 provides for the embodiment of the present invention is fixed as
During 4mm, external sort factor Qex dWith arc feed probes length LdBetween graph of relation；
The coupling window thickness between two chambers that Fig. 9 provides for the embodiment of the present invention is fixed as 4mm,
And dielectric tuning dish with annular dielectric resonator spacing be fixed as 4mm time, coefficient of coup k12With the first coupling
Close the graph of relation between window width W；
Differential bandpass filter 1.5GHz to the 2GHz arrowband that Figure 10 A provides for the embodiment of the present invention shows
Time simulation result and test result comparison diagram；
Differential bandpass filter 1.5GHz to the 4GHz broadband that Figure 10 B provides for the embodiment of the present invention shows
Time simulation result and test result comparison diagram.
Detailed description of the invention
The embodiment of the present invention is by providing a kind of harmonics restraint difference based on blending agent and coaxial resonator
Band filter, solves difference filter harmonic performance based on dielectric resonator present in prior art
The problem of difference, as the highest in differential mode stopband and common mode inhibition level, harmonics restraint differential bandpass filter of the present invention
The harmonic performance of difference filter based on dielectric resonator can be improved, be embodied in raising its differential mode resistance
Bandwidth and common mode inhibition level.
The technical scheme of the embodiment of the present invention is for solving above-mentioned technical problem, and general thought is as follows:
Embodiments providing a kind of harmonics restraint differential bandpass filter, described wave filter includes: gold
Belong to cavity；First medium resonator, coaxial resonator and second being fixedly installed in described metallic cavity
Dielectric resonator；Wherein, described first medium resonator and described second medium resonator are about described same
Axle resonator is symmetrical, and the main mould of described first medium resonator and described second medium resonator is TE01δ
Mould or TE11δMould, the main mould of described coaxial resonator is TEM basic mode, described TE01δMould or TE11δMould and
The resonant frequency of described TEM basic mode is identical；It is fixedly installed on described first medium resonator side, with institute
State the first medium resonator the first difference incentive structure by ampere's right handed screw rule excitation coupling；Gu
Surely described second medium resonator side it is arranged on, with described second medium resonator by ampere right hand spiral shell
Second difference incentive structure of rotation rule excitation coupling；Described first difference incentive structure and described second poor
Shunt excitation is encouraged symmetrical configuration and is arranged in described metallic cavity；It is arranged on the outer wall of described metallic cavity, with
Described first difference incentive structure is corresponding with described second difference incentive structure to be connected, and is used for and PERCOM peripheral communication
Multiple microwave coaxial joints that equipment is connected；Wherein, described first difference incentive structure and described second poor
The difference pumping signal input structure that one is described wave filter in point both incentive structures, and another
Difference pumping signal export structure for described wave filter.
Visible, in embodiments of the present invention, be used in mixed way dielectric resonator and coaxial resonator, by
Differential bandpass filter based on dielectric resonator introduces coaxial resonator, the crowd of suppression dielectric resonator
Multiple-harmonic so that this differential bandpass filter can obtain wider differential mode stopband and common mode inhibition.Effectively
Solve the problem of the difference of difference filter harmonic performance based on dielectric resonator in prior art, such as differential mode
Stopband and common mode inhibition level are the highest, improve the harmonic performance of difference filter based on dielectric resonator,
It is embodied in and improves its differential mode resistance band and common mode inhibition level.
In order to be better understood from technique scheme, below in conjunction with Figure of description and concrete embodiment party
Technique scheme is described in detail by formula, it should be understood that the tool in the embodiment of the present invention and embodiment
Body characteristics is to describe technical scheme in detail rather than restriction to technical scheme,
In the case of not conflicting, the technical characteristic in the embodiment of the present invention and embodiment can be mutually combined.
Embodiment one
Embodiments provide a kind of harmonics restraint differential bandpass filter, as it is shown in figure 1, be that this is humorous
The top view of ripple suppression differential bandpass filter, space coordinates is XYZ, this harmonics restraint difference bandpass filtering
Device includes:
Metallic cavity 1, specially metallic enclosure, for reducing differential bandpass filter described in outer bound pair
Signal disturbing；
The first medium resonator 21, the coaxial resonator 22 and second that are fixedly installed in metallic cavity 1 are situated between
Matter resonator 23；Wherein, first medium resonator 21 and second medium resonator 23 are about coaxial resonator
22 is symmetrical, and the main mould of first medium resonator 21 and second medium resonator 23 is TE01δMould or TE11δ
Mould, the main mould of coaxial resonator 22 is TEM basic mode, described TE01δMould or TE11δMould and described TEM
The resonant frequency of basic mode is identical.In specific implementation process, first medium resonator 21 and second medium are humorous
Shake device 23 concretely annular dielectric resonator or Rectangular Enclosure with Participating Media resonator；Coaxial resonator 22 is concretely
Metal coaxial resonator；First medium resonator 21 and the size of second medium resonator 23 and dielectric constant
Identical；
It is fixedly installed on first medium resonator 21 side, with first medium resonator 21 by the ampere right hand
First difference incentive structure 31 of screw rule excitation coupling；It is fixedly installed on second medium resonator 23 other
Side, the second difference excitation knot coupled by ampere's right handed screw rule excitation with second medium resonator 23
Structure 32；First difference incentive structure 31 and the second difference incentive structure 32 are symmetrical about coaxial resonator 22
It is arranged in metallic cavity 1；
It is arranged on the outer wall of metallic cavity 1, encourages knot with the first difference incentive structure 31 and the second difference
Structure 32 is corresponding to be connected, for the multiple microwave coaxial joints 30 being connected with external communication device；
Wherein, one in both the first difference incentive structure 31 and the second difference incentive structure 32 is described
The difference pumping signal input structure of wave filter, and the difference pumping signal that another is described wave filter is defeated
Go out structure.
It is as a example by annular dielectric resonator by first medium resonator 21 and second medium resonator 23, please join
Examine Fig. 2 A, for being carried in metallic cavity first annular dielectric resonator 21 (or the second annular dielectric resonance
Device 23) TE01δThe magnetic distribution schematic diagram of mould, wherein, solid arrow represents Distribution of Magnetic Field, dotted line arrow
Head represents Electric Field Distribution.TE01δMould is made as the main die worker of annular dielectric resonator.TE01δModular ring shape medium
Resonator inside has a circular Electric Field Distribution, Distribution of Magnetic Field annular dielectric resonator inside and
Outside, and vertical with the rounded face of Electric Field Distribution.TE01δThe magnetic field of mould is on the axis of dielectric resonator
The distance enough with outside dielectric resonator is the strongest.In specific implementation process, first medium is humorous
Shaking device 21 and second medium resonator 23 can be also Rectangular Enclosure with Participating Media resonator, it is at TE11δElectricity under pattern
Distribution of Magnetic Field repeats the most one by one.
Refer to Fig. 2 B, for being carried in the electromagnetism of metal coaxial resonator 22TEM basic mode in metallic cavity
Field distribution schematic diagram, wherein, solid arrow represents Distribution of Magnetic Field figure, and dotted arrow represents Electric Field Distribution.
TEM basic mode is made as the main die worker of coaxial resonator.In fig. 2b, one end 221 of coaxial resonator is short
Road, the other end 222 are opened a way, and the coaxial resonator of short at one end can be regarded as quarter-wave resonance
Device, and the electric field of TEM basic mode is concentrated mainly on open end 222, and magnetic field is concentrated mainly on short-circuit end
221。
Then, refer to Fig. 3 A and 3B, respectively illustrate annular dielectric resonator by two groups of differential probe pair
Excitation and metal coaxial resonator are by the simulation frequency response diagram of two single-ended probe excitations.Can from Fig. 3 A
To find out, the intrinsic various modes of dielectric resonator is segmented into two classes responses, and some patterns are (such as TE01δ
Mould) serve as differential-mode response (such as curve S in Fig. 3 Add21Shown in), remaining pattern is (such as TM01Mould)
Serve as common-mode response (such as curve S in Fig. 3 Acc21Shown in).Work as TE01δWhen mould is as main mould, TM01Mould
Etc. higher mode relative to TE01δMould is harmonic mode, further as resonant frequency and main mould humorous of harmonic wave
It is close that vibration frequency leans on, and therefore these harmonic waves can make the performance degradation of differential bandpass filter, such as selects
Property and common mode rejection performance.It can be seen that work as metal coaxial resonator by two single-ended probes from Fig. 3 B
During excitation, it may appear that two resonant frequencies, first resonant frequency representative is main mould TEM basic mode, separately
What an outer resonant frequency represented is minimum subharmonic.
Further, based on above-mentioned first medium resonator 21, coaxial resonator 22, second medium resonator
The 23 magnetic distribution schematic diagrams under holotype, and the emulation frequency of dielectric resonator and coaxial resonator
Rate response diagram, the difference band that the present invention uses the method for blending agent resonator and coaxial resonator to design leads to
Wave filter, numerous harmonic waves (as differential-mode response or common-mode response) of dielectric resonator can be suppressed.
Fig. 1 shows the topology layout of differential bandpass filter.In conjunction with shown in Fig. 2 A and Fig. 2 B
TE01δMould (corresponding annular dielectric resonator) and the electromagnetism of TEM basic mode (corresponding metal coaxial resonator)
Field distribution situation, dielectric resonator and coaxial resonator should be by the orthogonal magnetic couplings put and realize between them
Close.Specifically, referring still to Fig. 1, the axial (not shown) of first medium resonator 21 and the
The axially in parallel (not shown) of second medium resonator 23；First medium resonator 21 axially with
The axial (not shown) of axle resonator 22 is vertical.Concrete, first medium resonator 21 axial,
Second medium resonator 23 axially all the most identical with Z-direction, the axial and X-axis of coaxial resonator 22
Direction is identical.
In specific implementation process, referring still to Fig. 1, corresponding a pair first of the first difference incentive structure 31
Difference port, same, the corresponding a pair second difference ports of the second difference incentive structure 32, wherein, institute
State the first difference port and described second difference port all can be as signal input/output end port；Concrete,
When described first difference port is signal input port, described second difference port is signal output part
Mouthful；Or when described second difference port is signal input port, described first difference port is that signal is defeated
Go out port.
Further, first medium resonator 21 and the TE of second medium resonator 2301δMode division is not by first
Difference incentive structure 31 and the second difference incentive structure 32 encourage.Concrete, refer to Fig. 4 or figure
5, first medium resonator 21 and second medium resonator 23 are annular dielectric resonator, the first difference
Incentive structure 31 includes symmetrically arranged first feed probes 311 and the second feed probes 312 of minute surface；First
Feed probes 311 is the most concentric with a level cross-sectionn of first medium resonator 21 and the number of degrees are less than 90 °
Circular arc needle body, for being coupled by ampere's right handed screw rule excitation with first medium resonator 21；
Wherein, the first difference incentive structure 31 spacer ring is arranged around first medium resonator 21 outer surface, not with the
One dielectric resonator 21 contacts；Second feed probes 312 is identical with the first feed probes 311 structure,
Second difference incentive structure 32 and the first difference incentive structure 31 have identical structure, the most one by one
Repeat.
In specific implementation process, refer to Fig. 1, Fig. 4 and Fig. 5, the first difference incentive structure 31 and
Two difference incentive structures 32 comprise four feed probes altogether；In described differential bandpass filter metallic cavity 1
With described four feed probes outer walls one to one on be provided with four microwave coaxial joints (Port1,
Port1 ', Port2, Port2 ') (i.e. such as four microwave coaxial joints 30 in Fig. 1), it is specifically as follows SMA
Joint；Each joint in described four microwave coaxial joints includes: with in described four feed probes
The inner wire 301 that one feed probes is connected, and the outer conductor 302 being connected with metallic cavity 1 outer wall, with
Realize described differential bandpass filter to be connected with external communication device, and by the first difference incentive structure 31
(or second difference incentive structure 32) input or output signal.Further, described differential bandpass filter tool
Having differential mode and two kinds of duties of common mode, refer to Fig. 5, two feeds of the first difference incentive structure 31 are visited
Corresponding two the microwave coaxial joints of pin (i.e. first feed probes 311 and the second feed probes 312) (Port1,
Port1 '), the second difference incentive structure 32 two other microwave coaxial joint corresponding (Port2, Port2 '),
Under differential mode duty, signal is that constant amplitude is reversely from (or the second difference excitation of the first difference incentive structure 31
Structure 32) two ports enter or out, under common mode operation state, signal is that constant amplitude is in the same direction from the
Two ports of one difference incentive structure 31 (or second difference incentive structure 32) enter or out.
As a example by below using the first difference incentive structure 31 as signal input port, referring still to Fig. 4, poor
Under mould duty, the first feed probes 311 and the second feed probes 312 introduce the first electric current and respectively
Two electric currents, described first electric current is identical and in opposite direction with the size of described second electric current, described first electricity
Stream and described second electric current encourage first medium resonator 21 for difference.Again incorporated by reference to Fig. 2 A and Fig. 4,
Fig. 2 A shows that the first medium resonator 21 of annular is at TE01δMagnetic distribution schematic diagram under pattern,
Fig. 4 shows the first feed probes 311 and second feed probes 312 electric current side under differential mode duty
To, according to ampere's right handed screw rule, the magnetic field that in Fig. 4, the first difference incentive structure 31 introduces and Fig. 2 A
Middle TE01δThe magnetic field of mould dielectric resonator is consistent, therefore, and the TE of first medium resonator 2101δMould
Can be energized.The TE of above-mentioned first medium resonator 2101δIt is humorous that the operation principle of mould is also applied for second medium
Shake device 23.
Further, the TE of dielectric resonator01δMould can be placed on the excitation of aspectant probe difference by a pair,
Then design the TEM basic mode of coaxial resonator, then adjust dielectric resonator and coaxial resonator, make TEM
Basic mode and TE01δThe resonant frequency of mould is identical.Therefore, the TE of only dielectric resonator01δMould can be by same
The TEM fundamental mode propagation of axle resonator, builds differential mode passband with this, and numerous harmonic waves of dielectric resonator
Can not be propagated by coaxial resonator, unless the resonance frequency of dielectric resonator harmonic wave and coaxial resonator harmonic wave
Rate is identical.So, by this be used in mixed way dielectric resonator and coaxial resonator by the way of, just build
Going out the differential bandpass filter with harmonics restraint as shown in Figure 1, its structure is not strict along difference
Probe between Y-axis centrage symmetrical, this is different from the design of traditional differential bandpass filter, with
Time also provide for the design concept of a novel differential bandpass filter.
It is to say, in the present embodiment, with first medium resonator 21 and second medium resonator 23 it is
As a example by annular dielectric resonator, the operation principle of described differential bandpass filter is: a pair difference excitation letter
Number from two ports input of the first difference incentive structure 31 correspondence, the TE of first medium resonator 2101δ
Mould is energized；Magnetic coupling is passed through between first medium resonator 21 and coaxial resonator 22 so that with
The TEM basic mode of axle resonator 22 is also energized；Then, coaxial resonator 22 and second medium are humorous
Shake and pass through magnetic coupling between device 23 so that the TE of second medium resonator 2301δMould is energized；Enter
One step, two are passed through TE between dielectric resonator and coaxial resonator01δMould and TEM basic mode build difference band
The differential mode passband of bandpass filter, with will input pumping signal from input port (the i.e. first difference incentive structure
31) it is transferred to output port (the i.e. second difference incentive structure 32) export；Wherein, described difference band
It, during transmitting described difference pumping signal, is just filtered by the differential mode passband of bandpass filter
Processing, i.e. the signal of output port output is filtered signal.Certainly, the second difference incentive structure 32
Also can be as signal input port, then, the first difference incentive structure 31 is signal output port, filter
Ripple principle is ibid.
In specific implementation process, described differential bandpass filter also includes: the use mated with metallic cavity 1
In the crown cap 7 that lid is located in metallic cavity 1, as shown in Figure 6, it is located at metallic cavity for crown cap 7 lid
The width of differential bandpass filter high side cross-sectional view time on 1, is i.e. perpendicular to the long and high face determined of metallic cavity 1
Sectional view, in figure 6, due to visual angle, the difference incentive structure of described differential bandpass filter
(i.e. feed probes) cannot illustrate；So that the filter effect of described differential bandpass filter can reach
Optimum level, therefore, to assure that first medium resonator 21, coaxial resonator 22 and second medium resonator 23
The resonant frequency of three equal (the most in actual applications can not be essentially equal, described in the present embodiment
Equal be that the two is the most close), on crown cap 7 inner face, be provided with and first medium resonance
Device 21 and second medium resonator 23 dish of first medium tuning one to one 41 and second medium tuning dish
42, it is respectively used to regulate first medium resonator 21 and the resonant frequency of second medium resonator 23, so that
The resonant frequency of first medium resonator 21, second medium resonator 23 resonant frequency respectively with the most humorous
Shake the resonant frequency equal (in conjunction with Fig. 6 and Fig. 7) of device 22.Wherein, described crown cap inner face is specially gold
Belong to the face relative with metallic cavity 1 of lid 7；Fig. 7 is provided with on crown cap 7 multiple aperture, is used for
Crown cap 7 and metallic cavity 1 wear screw when assembling and are fixed.
Concrete, referring still to Fig. 6, when crown cap 7 is combined installation with metallic cavity 1, crown cap
There is certain interval in inner face and the first medium resonator 21 (or second medium resonator 23) of 7, connects
, still incorporated by reference to Fig. 6 and Fig. 7, first medium tuning dish 41 and second medium tuning dish 42 pass through respectively
First screw rod 51 and the second screw rod 52 are connected with crown cap 7, by rotating the first screw rod 51 or the second spiral shell
Bar 52, changes the distance of first medium tuning dish 41 and first medium resonator 21, or changes second medium
Tuning dish 42 and the distance of second medium resonator 23, to realize first annular dielectric resonator 21
The regulation of the resonant frequency of resonant frequency or the second annular dielectric resonator 23.
In the embodiment of the present application, as it is shown in figure 5, be the structure cloth of a third order difference band filter
Office, metallic cavity 1 includes the first chamber the 11, second chamber 12 and the 3rd chamber 13；First medium resonance
Device 21 is arranged in the first chamber 11, and coaxial resonator 22 is arranged in the second chamber 12, second medium
Resonator 23 is arranged in the 3rd chamber 13；It is provided with first between first chamber 11 and the second chamber 12
Spaced walls 141, the first spaced walls 141 is dug the first coupling window 151 being communicated with two chambers, so that
The magnetic field of first medium resonator 21 and coaxial resonator 22 can intercouple；Second chamber 12 and
It is provided with the second spaced walls 142 between three chambers 13, the second spaced walls 142 is dug and is communicated with two chambers
The second coupling window 152 so that the magnetic field of coaxial resonator 22 and second medium resonator 23 can be mutual
Coupling.
Further, referring still to Fig. 6, described wave filter also includes: symmetrical and be fixedly installed on metallic cavity
Aluminium oxide material (Al bottom 12O3) the first pedestal 61 and the second pedestal (with the first pedestal in Fig. 6
61 designs are identical, are not drawn in figure), it is respectively used to carry first medium resonator 21 and second medium is humorous
Shake device 23, and wherein, the first pedestal 61 is arranged in the first chamber 11, and the second pedestal is arranged on the 3rd chamber
In 13；Pedestal and dielectric resonator can be fixed by the way of gluing, as shown in Figure 6, and the first base
Seat 61 is fixed by the bottom of a screw 611 with metallic cavity 1, and same, the second pedestal also leads to
The bottom crossing screw and metallic cavity 1 is fixed (being not drawn in figure), first medium resonator 21 He
The second medium resonator 23 rational height in metallic cavity 1 is identical.Refer to Fig. 5, coaxial resonator
One end of 22 is fixedly installed on the first side wall 101 of metallic cavity 1, the first coupling window 151 and the second coupling
Conjunction window 152 is separately positioned on the close the first side wall 101 of the first spaced walls 141 and the second spaced walls 142
Side.Additionally, in specific implementation process, relative with the first side wall 101 of the second chamber 12
Be provided with the first metal tuning screw 81 on two sidewalls 102, concrete, the first metal tuning screw 81 with
Second sidewall 102 is threaded connection, can run through the second sidewall 102, and is positioned at the axle of coaxial resonator 22
Upwards, it is in the surface of coaxial resonator 22, by turn the first metal tuning screw 81 to regulate it
With the distance of coaxial resonator 22, and then the resonant frequency of coaxial resonator 22 can be adjusted.Enter one
Step, according to reality application needs, can the first side wall 101 with the first coupling window 151 and the second coupling window
Second metal tuning screw 82 and the 3rd metal tuning screw 83, the second gold medal are set on the position of 152 correspondences
Genus tuning screw 82 and the 3rd metal tuning screw 83 are threaded connection with the first side wall 101 respectively and can
Run through the first side wall 101, by turn the second metal tuning screw 82 and the 3rd metal tuning screw 83 with
Regulate the first coupling window 151 and size of the second coupling window 152, to regulate coaxial resonator 22 and first
The coefficient of coup between dielectric resonator 21 and second medium resonator 23.
In specific implementation process, set the design objective of differential bandpass filter to be designed as: in
Frequency of heart be 1.75GHz, 0.13dB ripple relative bandwidth be 0.97% third order difference Chebyshev carry logical filter
Ripple device, in conjunction with the topology layout of above three chamber, respectively at inner face and the first medium resonance of crown cap 7
First medium tuning dish 41 and second medium are set on the position of device 21 and second medium resonator 23 correspondence
Tuning dish 42 (as shown in Figure 7), for the resonant frequency of two dielectric resonators is finely adjusted, so that
It all can be to greatest extent close to 1.75GHz；Wherein, first medium resonator 21 and second medium resonance
The dielectric constant of device 23 is 38.Meanwhile, metallic cavity 1 the second sidewall 102 with coaxial resonance
First metal tuning screw 81 (as shown in Figure 5) is set on the position that device 22 is relative, for the most humorous
The resonant frequency of device 22 of shaking is finely adjusted, so that it also can be to greatest extent close to 1.75GHz.Due to base
External sort factor (Q is depended in design in the wave filter of dielectric resonatorex d), the first chamber 11 and
The coefficient of coup (the k of two chambers 1212) and the second chamber 12 and coefficient of coup (k of the 3rd chamber 1323),
According to above-mentioned design objective, the lamped element value of lowpass prototype filter is: g0=1, g1=1.0872,
g2=1.1526, g3=1.0872.The Q that wave filter design is wantedex d、k12And k23Can be by below equation
(1) obtaining with (2), formula is expressed as:
Again incorporated by reference to Fig. 8 and Fig. 9, Fig. 8 is when the spacing of dielectric tuning dish with annular dielectric resonator
(Gap) when being fixed as 4mm, the external sort factor (Q of wave filterex d) and described arc feed probes
Length (LdGraph of relation between)；Fig. 9 is that (iris, such as Fig. 5 when the thickness of the first coupling window 151
Shown in) when being fixed as 4mm and Gap=4mm, first chamber 11 and the coefficient of coup of the second chamber 12
(k12) and the width (W) of the first coupling window 151 between graph of relation；It should be noted that
Three chambers 13 are symmetrical about the second chamber 12 and the first chamber 11, i.e. k12=k23, then the second chamber 12 with
The coefficient of coup (the k of the 3rd chamber 1323) and the width (W) of the second coupling window 152 between relation bent
Line and Fig. 9 have identical variation tendency.Reach the design objective of above-mentioned band filter, in conjunction with Fig. 5
And Fig. 6, the associated components size of wave filter is defined below: Ld=23mm, W=22mm,
DR_D=32mm, Hole_D=8mm, DR_H=13mm, Disk_D=25mm,
Disk_H=2mm, a=46mm, b=146mm, c=32mm, h1=33mm, d1=14mm,
Gap=4mm, iris=4mm；Wherein, LdFor described arc feed probes length (the i.e. first feed probes
311) length, W is the first coupling window 151 or width of the second coupling window 152, and iris is the first coupling
Window 151 or the thickness of the second coupling window 152, the external diameter of the DR_D annular dielectric resonator by being used,
The internal diameter (i.e. aperture) of the Hole_D annular dielectric resonator by being used, DR_H is the annular used
The height of dielectric resonator, the diameter of the Disk_D dielectric tuning dish by being used, Disk_H is by being used
The thickness of dielectric tuning dish, a is the width of metallic cavity 1, and b is the length of metallic cavity 1, and c is gold
Belonging to the height of cavity 1, Gap is the spacing of dielectric tuning dish and annular dielectric resonator, h1For coaxial resonance
The height of device, d1Diameter for coaxial resonator.
According to above-mentioned a series of design parameters, on the one hand, use an Ansoft full-wave simulator (HFSS)
Obtain the simulation result of designed band filter, on the other hand, use Agilent four port network
Analyser N5230A PNA-L obtains the experimental result of this band filter.Simulation result (i.e. theoretical value)
Contrasting as shown in figs. 10 a and 10b with measurement result (i.e. actual measured value), Figure 10 A is difference band
Simulation result and test result comparison diagram during the display of bandpass filter 1.5GHz to 2GHz arrowband, Figure 10 B is
The simulation result during display of differential bandpass filter 1.5GHz to 4GHz broadband and test result comparison diagram,
Where the dotted line signifies that simulation result, solid line represents test result, in Figure 10 A and Figure 10 B, Sdd11For institute
State the S of the difference mode signal of differential bandpass filter11Parameter, Sdd21S for this difference mode signal21Parameter, Scc21
S for the common-mode signal of described differential bandpass filter21Parameter, it is seen that, simulation result and test knot
The S parameter of fruit shows good concordance.The differential mode passband central frequency recorded can when 1.75GHz
Realize the 3dB relative bandwidth of 1.34%.Minimum insertion loss (the S recordeddd21) only 0.8dB is (wherein
It is included in difference port and uses the loss of sub-miniature A connector), and return loss (S in passbanddd11) excellent
In 13.5dB.On differential mode, stopband is expanded, and this is the repressed knot of numerous harmonic waves of dielectric resonator
Really, also reached the common mode inhibition (S in broadband simultaneouslycc21) level.As can be seen from Figure 10B, measurement
Differential mode stopband suppression in the frequency range of 1.792GHz to 3.8GHz be more than 30dB, common mode inhibition from
40dB and the frequency at 1.5GHz to 3.95GHz it is more than in the frequency range of 1.5GHz to 2.88GHz
In the range of higher than 20dB.
Sum it up, the application scheme provides a kind of based on blending agent resonator and coaxial resonator
Novel high-performance differential bandpass filter, by drawing in differential bandpass filter based on dielectric resonator
Enter coaxial resonator, numerous harmonic waves of suppression dielectric resonator so that this differential bandpass filter can obtain
Differential mode stopband that must be wider and common mode inhibition.Efficiently solve in prior art based on dielectric resonator
Difference filter harmonic performance difference problem, as the highest in differential mode stopband and common mode inhibition level, improve based on
The harmonic performance of the difference filter of dielectric resonator, is embodied in and improves its differential mode stopband broadband and be total to
Mould suppression level, will certainly be used widely in many actual commercial Application.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know base
This creativeness concept, then can make other change and amendment to these embodiments.So, appended right is wanted
Ask and be intended to be construed to include preferred embodiment and fall into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification without deviating from this to the present invention
Bright spirit and scope.So, if the present invention these amendment and modification belong to the claims in the present invention and
Within the scope of its equivalent technologies, then the present invention is also intended to comprise these change and modification.
Claims (10)
1. a harmonics restraint differential bandpass filter, it is characterised in that described wave filter includes:
Metallic cavity；
First medium resonator, coaxial resonator and the second medium being fixedly installed in described metallic cavity
Resonator；Wherein, described first medium resonator and described second medium resonator are about described the most humorous
The device that shakes is symmetrical, and the main mould of described first medium resonator and described second medium resonator is TE01δMould or
TE11δMould, the main mould of described coaxial resonator is TEM basic mode, described TE01δMould or TE11δMould and described
The resonant frequency of TEM basic mode is identical；
It is fixedly installed on described first medium resonator side, passes through ampere with described first medium resonator
First difference incentive structure of right-hand screw rule excitation coupling；It is fixedly installed on described second medium resonance
Device side, encourages, with described second medium resonator, the second difference coupled by ampere's right handed screw rule
Incentive structure；Described first difference incentive structure and described second difference incentive structure are symmetricly set on described
In metallic cavity；
It is arranged on the outer wall of described metallic cavity, with described first difference incentive structure and described second poor
Incentive structure correspondence is divided to connect, for the multiple microwave coaxial joints being connected with external communication device；
Wherein, one in described first difference incentive structure and described second difference incentive structure is
The difference pumping signal input structure of described wave filter, and the difference excitation letter that another is described wave filter
Number export structure.
2. harmonics restraint differential bandpass filter as claimed in claim 1, it is characterised in that described the
One dielectric resonator and described second medium resonator are respectively annular dielectric resonator or Rectangular Enclosure with Participating Media resonance
Device；Described coaxial resonator is metal coaxial resonator.
3. harmonics restraint differential bandpass filter as claimed in claim 1, it is characterised in that described the
One dielectric resonator axially and described second medium resonator axially in parallel；Described first medium resonance
Device axially and described coaxial resonator axially vertical.
4. harmonics restraint differential bandpass filter as claimed in claim 1, it is characterised in that described the
One difference incentive structure includes symmetrically arranged first feed probes of minute surface and the second feed probes；Described
One feed probes is the most concentric with a level cross-sectionn of described first medium resonator and the number of degrees are less than 90 °
Circular arc needle body, for encouraging coupling with described first medium resonator by ampere's right handed screw rule
Close；
Described second feed probes is identical with described first feed probes structure, described second difference excitation knot
Structure and described first difference incentive structure have identical structure.
5. harmonics restraint differential bandpass filter as claimed in claim 4, it is characterised in that described the
One feed probes and described second feed probes introduce the first electric current and second under differential mode duty respectively
Electric current, described first electric current is identical and in opposite direction with the size of described second electric current, described first electric current
Described first medium resonator is encouraged for difference with described second electric current.
6. harmonics restraint differential bandpass filter as claimed in claim 4, it is characterised in that described many
Individual microwave coaxial joint is specially four, and four microwave coaxial joint one_to_one corresponding swash with described first difference
Four feed probes encouraging structure and described second difference incentive structure connect；
Each joint in described four microwave coaxial joints includes: with a feedback in described four feed probes
The inner wire that electric probe is connected, and the outer conductor being connected with described metallic cavity outer wall.
7. harmonics restraint differential bandpass filter as claimed in claim 1, it is characterised in that described filter
Ripple device also includes: mate with described metallic cavity, is located at the crown cap in described metallic cavity for lid；
It is arranged on described crown cap inner face, with described first medium resonator and described second medium resonance
The device dish of first medium tuning one to one and second medium tuning dish, be respectively used to regulate described first and be situated between
Matter resonator and the resonant frequency of described second medium resonator, so that described first medium resonator is humorous
Vibration frequency, described second medium resonator resonant frequency respectively with the resonant frequency of described coaxial resonator
Equal；
Wherein, described crown cap inner face is specially the face that described crown cap is relative with described metallic cavity.
8. harmonics restraint differential bandpass filter as claimed in claim 1, it is characterised in that described gold
Belong to cavity and include the first chamber, the second chamber and the 3rd chamber；Described first medium resonator is arranged on institute
Stating in the first chamber, described coaxial resonator is arranged in described second chamber, described second medium resonance
Device is arranged in described 3rd chamber；
The first spaced walls, described first spaced walls it is provided with between described first chamber and described second chamber
On dig the first coupling window being communicated with two chambers so that described first medium resonator and described coaxially
The magnetic field of resonator can intercouple；It is provided with second between described second chamber and described 3rd chamber
Spaced walls, described second spaced walls is dug the second coupling window being communicated with two chambers, so that described same
The magnetic field of axle resonator and described second medium resonator can intercouple.
9. harmonics restraint differential bandpass filter as claimed in claim 8, it is characterised in that described same
One end of axle resonator is fixedly installed on the first side wall of described metallic cavity, described first coupling window and
Described second coupling window is separately positioned on close described the of described first spaced walls and described second spaced walls
The side of one sidewall.
10. harmonics restraint differential bandpass filter as claimed in claim 8, it is characterised in that described filter
Ripple device also includes: is fixedly installed on the first pedestal bottom described metallic cavity and the second pedestal, uses respectively
In carrying described first medium resonator and described second medium resonator；Described first pedestal is arranged on institute
Stating in the first chamber, described second pedestal is arranged in described 3rd chamber；Described first medium resonator
Identical with described second medium resonator rational height in described metallic cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610290803.4A CN105896002A (en) | 2016-05-04 | 2016-05-04 | Harmonic-suppression differential band-pass filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610290803.4A CN105896002A (en) | 2016-05-04 | 2016-05-04 | Harmonic-suppression differential band-pass filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105896002A true CN105896002A (en) | 2016-08-24 |
Family
ID=56702308
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610290803.4A Pending CN105896002A (en) | 2016-05-04 | 2016-05-04 | Harmonic-suppression differential band-pass filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105896002A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106252805A (en) * | 2016-08-30 | 2016-12-21 | 南通大学 | A kind of mixing balun wave filter |
| CN107579320A (en) * | 2017-08-21 | 2018-01-12 | 华南理工大学 | A kind of harmonics restraint coaxial cavity filter |
| CN107742765A (en) * | 2017-10-18 | 2018-02-27 | 南通大学 | A kind of difference filter based on bimodulus dielectric patch resonator |
| WO2018098642A1 (en) * | 2016-11-29 | 2018-06-07 | 华为技术有限公司 | Filter, and communication apparatus |
| CN108390137A (en) * | 2018-01-25 | 2018-08-10 | 西安电子科技大学 | A kind of coupled structure dielectric resonator filter |
| CN110635228A (en) * | 2019-08-27 | 2019-12-31 | 南通大学 | Dual-passband circularly polarized dielectric resonator antenna |
| CN113036438A (en) * | 2021-03-23 | 2021-06-25 | 南通大学 | Broadband low-profile dielectric resonator antenna for beamforming application |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104767016A (en) * | 2015-03-31 | 2015-07-08 | 南通大学 | Differential band-pass filter based on TE01delta mode dielectric resonators |
-
2016
- 2016-05-04 CN CN201610290803.4A patent/CN105896002A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104767016A (en) * | 2015-03-31 | 2015-07-08 | 南通大学 | Differential band-pass filter based on TE01delta mode dielectric resonators |
Non-Patent Citations (1)
| Title |
|---|
| H.-Y. HWANG等: ""The design of band-pass filters made of both dielectric and coaxial resonators"", 《1997 IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST》 * |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106252805A (en) * | 2016-08-30 | 2016-12-21 | 南通大学 | A kind of mixing balun wave filter |
| CN109983616B (en) * | 2016-11-29 | 2020-07-07 | 华为技术有限公司 | Filter and communication equipment |
| WO2018098642A1 (en) * | 2016-11-29 | 2018-06-07 | 华为技术有限公司 | Filter, and communication apparatus |
| CN109983616A (en) * | 2016-11-29 | 2019-07-05 | 华为技术有限公司 | A kind of filter and communication equipment |
| US10818989B2 (en) | 2016-11-29 | 2020-10-27 | Huawei Technologies Co., Ltd. | Filter and communications device |
| CN107579320A (en) * | 2017-08-21 | 2018-01-12 | 华南理工大学 | A kind of harmonics restraint coaxial cavity filter |
| CN107742765A (en) * | 2017-10-18 | 2018-02-27 | 南通大学 | A kind of difference filter based on bimodulus dielectric patch resonator |
| CN107742765B (en) * | 2017-10-18 | 2019-12-13 | 南通大学 | Differential filter based on dual-mode dielectric patch resonator |
| CN108390137A (en) * | 2018-01-25 | 2018-08-10 | 西安电子科技大学 | A kind of coupled structure dielectric resonator filter |
| CN108390137B (en) * | 2018-01-25 | 2019-10-11 | 西安电子科技大学 | A kind of coupled structure dielectric resonator filter |
| CN110635228A (en) * | 2019-08-27 | 2019-12-31 | 南通大学 | Dual-passband circularly polarized dielectric resonator antenna |
| CN110635228B (en) * | 2019-08-27 | 2020-12-08 | 南通大学 | Dual-passband circularly polarized dielectric resonator antenna |
| CN113036438A (en) * | 2021-03-23 | 2021-06-25 | 南通大学 | Broadband low-profile dielectric resonator antenna for beamforming application |
| CN113036438B (en) * | 2021-03-23 | 2022-12-06 | 南通大学 | Broadband low-profile dielectric resonator antenna for beamforming application |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105896002A (en) | Harmonic-suppression differential band-pass filter | |
| Xu et al. | High-selectivity wideband bandpass filter using simple coupled lines with multiple transmission poles and zeros | |
| Feng et al. | High selectivity wideband balanced filters with multiple transmission zeros | |
| Shaman et al. | A novel ultra-wideband (UWB) bandpass filter (BPF) with pairs of transmission zeroes | |
| Sun et al. | Multiple-resonator-based bandpass filters | |
| Chen et al. | A differential-mode wideband bandpass filter on slotline multi-mode resonator with controllable bandwidth | |
| Chu et al. | Wideband balanced filters with high selectivity and common-mode suppression | |
| CN105720339B (en) | A kind of double frequency variable band-pass filter | |
| CN104767016A (en) | Differential band-pass filter based on TE01delta mode dielectric resonators | |
| CN109326859A (en) | TM bimodulus based on SIW balances bandpass filter | |
| CN107086338A (en) | Four mould defects ground formula wave filter | |
| Ren et al. | Quasi-elliptic wideband bandstop filter using stepped-impedance coupled line | |
| CN106684513A (en) | Balance type band-pass filter with harmonic suppression function | |
| CN108155447A (en) | Highly selective, high common mode inhibition and compact-sized second order balance bandpass filter | |
| TWI442625B (en) | Wideband high frequency filter | |
| CN108258371A (en) | A kind of three mode filter of medium based on capacitive load and aperture coupled | |
| CN105896008B (en) | A kind of equal compact bandpass filter containing transmission zero in high and low frequency | |
| CN107453014A (en) | The wide upper high common mode inhibition micro-strip balanced duplexer of stopband of high selectivity | |
| Janković et al. | Balanced bandpass filter based on square patch resonators | |
| Jong et al. | New class of microstrip miniaturised filter using triangular stub | |
| CN105680127B (en) | Differential bandpass filter based on signal interference theory | |
| Chen et al. | Coaxial combline filters using the stepped-impedance resonators | |
| Tu | Sharp-rejection broadband microstrip bandpass filters using loaded open-loop resonator | |
| Xiao et al. | High selective balanced bandpass filters using end-connected conductor-backed coplanar waveguide | |
| CN106129570B (en) | A kind of medium power splitter with bandpass characteristics |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160824 |