CN106960995A - It is a kind of that there is wide upper stopband and the double mode LTCC bandpass filters of nonopiate feedback - Google Patents
It is a kind of that there is wide upper stopband and the double mode LTCC bandpass filters of nonopiate feedback Download PDFInfo
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- CN106960995A CN106960995A CN201710138152.1A CN201710138152A CN106960995A CN 106960995 A CN106960995 A CN 106960995A CN 201710138152 A CN201710138152 A CN 201710138152A CN 106960995 A CN106960995 A CN 106960995A
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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
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
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Abstract
There is wide upper stopband and the double mode LTCC bandpass filters of nonopiate feedback the invention discloses a kind of, the metal for being distributed in top layer ltcc substrate and bottom ltcc substrate and air contact portion is microstrip line, 2 laminar substrates are connected by metal band-shaped line, microstrip line is in stepped shape by two I/O ports, the broadside parallel coupled line for realizing wide upper stopband is formed, double-deck broadside parallel coupled line constitutes square ring resonator.It is above-mentioned that there is wide upper stopband and the double mode bandpass filter of nonopiate feedback, it is characterised in that the microstrip line of vertical direction and the strip line of horizontal direction have identical length L.The present invention realizes stopband on width using the broadside parallel coupled line with stepped impedance, realizes to second harmonic (2fo) 40dB suppression and to frequency 2.4foReach 20dB suppression.
Description
Technical field
The invention belongs to essential electronic element technical field, it is related to a kind of bimodulus with wide upper stopband and nonopiate feedback
Formula LTCC bandpass filters.
Background technology
Compact dimensions, bandpass filter (BPF, the Band- for possessing efficient band stray suppression and good band-pass behavior
Pass Filter) there is widespread demand in Modern Communication System (such as radar, satellite and Mobile solution).Due to filtering
The quantity of the resonator of device reduces half, so the double mode bandpass filter proposed in recent years has caused very big pass
Note, double mode bandpass filter size compared with single mode wave filter further reduces.
However, using the double mode bandpass filter with a wavelength or the resonator of half-wavelength in frequency 2fo,3fo,
4foPlace has parasitic passband, wherein foIt is the centre frequency of double mode bandpass filter, and the modern confidential suppression of sensitive receiver
Out-of-band interference is accomplished by broader stopband.Accordingly, it would be desirable to the double mode bandpass filter with stopband on width.In addition, most of
Dual-mode filter motivates two degenerate modes using input/output (I/O) port of cross feedback, and this can cause and it
Layout becomes difficult during his component connection.
Recently, LTCC (LTCC, Low Temperature Co-fired Ceramic) be considered as can
Reduce circuit size and put forward high performance multilayer encapsulation technology.LTCC is in many-sides such as circuit size, function, performance and costs
The advantage not having with planar circuit, also helping microwave designing personnel to solve, multifunctional single-sheet is integrated, mixed signal list
A series of problems such as piece is integrated, circuit miniaturization.Reduced simultaneously on weight and volume compared to conventional planar hydrid integrated circuit
An order of magnitude, drastically increases the Vertical collection level of circuit in z-direction, is that can play height to greatest extent at present
Integrated level, realizes one of circuit miniaturization, high reliability, high performance most effective approach.
The content of the invention
The technical problems to be solved by the invention are the defects for background technology, are proposed a kind of with wide upper stopband and non-
The double mode LTCC bandpass filter structures of cross feedback.The present invention realizes stopband and anon-normal on width in 2 layers of ltcc substrate
Hand over the bimodule band-pass filter of I/O feedbacks.Stopband comes real by using the broadside parallel coupled line with stepped impedance on width
It is existing.Resonance characteristic is analyzed with parity mode equivalent circuit method.Realize to frequency 2foReach 40dB suppression and to frequency
2.4foReach 20dB suppression.It is nonopiate feedback with it is double mode allow wave filter reduction size while be connected with other assemblies when
It is easier to layout.
The present invention is that one kind has wide upper stopband and nonopiate feedback to solve the technical scheme that above-mentioned technical problem is used
Double mode LTCC bandpass filters, the metal for being distributed in top layer ltcc substrate and bottom ltcc substrate and air contact portion is
Microstrip line, 2 laminar substrates are connected by metal band-shaped line, and microstrip line is in stepped shape by two I/O ports, is formed and realizes width
The broadside parallel coupled line of upper stopband, double-deck broadside parallel coupled line constitutes square ring resonator.
It is further, above-mentioned that there is wide upper stopband and the double mode LTCC bandpass filters of nonopiate feedback, it is characterised in that
The microstrip line of vertical direction and the strip line of horizontal direction have identical length L.
Preferably, the characteristic impedance of above-mentioned port section microstrip line is 50 Ω.
The present invention uses above technical scheme compared with prior art, with following technique effect：
1, the present invention realizes stopband on width using the broadside parallel coupled line with stepped impedance, realizes to secondary
Harmonic wave (2fo) 40dB suppression and to frequency 2.4foReach 20dB suppression.
2, in order to strengthen the relative bandwidth that Capacitance Coupled realizes 11%, square ring resonator is by double-deck broadside parallel coupled
Line is constituted.Double-decker can not only realize high coupled capacitor, but also vertical broadside coupled line can be used to replace flat edge
Edge coupling line reduces size.Stopband is realized by the staged impedance micro-strip by I/O ports on width.
3, because most of dual-mode filters using input/output (I/O) port of cross feedback motivate two
Degenerate mode, layout when this causes to be connected with other assemblies is difficult, and the present invention solves this problem by nonopiate feedback,
Double mode bandpass filter is smaller compared with single mode wave filter simultaneously.
Brief description of the drawings
Fig. 1 is tomograph and plane structure chart of the invention.
Fig. 2 is parity mode equivalent circuit diagram of the invention.
Fig. 3 is yield analysis figure of the invention.
Fig. 4 is simulation result and measurement result figure of the invention.
Embodiment
Technical scheme is described in further detail below in conjunction with the accompanying drawings.
A kind of double mode bandpass filter with wide upper stopband and nonopiate feedback proposed by the present invention, the wave filter exists
Realize, and realized using the broadside parallel coupled line with stepped impedance in 2 layers of LTCC (LTCC) substrate
Stopband on width.Realize to second harmonic (2fo) 40dB suppression and to frequency 2.4foReach 20dB suppression.In order to strengthen
Capacitance Coupled realizes 11% relative bandwidth, and square ring resonator is made up of double-deck broadside parallel coupled line.Double-decker is not
High coupled capacitor can be only realized, but also vertical broadside coupled line can be used to replace horizontal edge coupling line to reduce chi
It is very little.Stopband is realized by the staged impedance micro-strip by I/O ports on width.Most of dual-mode filters use cross feedback
Input/output (I/O) port motivate two degenerate modes, layout when this causes to be connected with other assemblies is difficult, non-
Cross feedback solves this problem, while double mode bandpass filter is smaller compared with single mode wave filter.
In order to strengthen the relative bandwidth that Capacitance Coupled realizes 11%, square ring resonator is by double-deck broadside parallel coupled line
Constitute.Double-decker can not only realize high coupled capacitor, but also vertical broadside coupled line can be used to replace horizontal edge
Coupling line reduces size.Stopband is realized by the staged impedance micro-strip by I/O ports on width.Vertically and horizontally side band lines
It is designed as W1And W2Width.Vertically and horizontally side band lines have identical length L.The characteristic impedance of port section microstrip line is
50 Ω, width is W0。L1And W3It is the length and width for the low impedance path being connected with I/O feeder lines respectively.Fig. 1 (a) shows institute
The structure of the bandpass filter of proposition.
Because the structure of the resonator with vertical broadside coupled line is symmetrical, therefore use parity mode equivalent circuit method
Analyze its characteristic.Electric wall is built along symmetrical plane and divides a structure into two halves.Fig. 2 (a) and (b) respectively illustrate equivalent strange mould and
Even moding circuit.The characteristic impedance of I/O feeder lines is Z0, the strange mould and ever mode characteristic impedance of vertical broadside coupled line are respectively Z10With
Z1e.Electrical length of the square ring resonator per side is θ, and its horizontal side line has Z2Characteristic impedance.By calculating such as Fig. 2
(a) and (b) shown in a port transmission line circuit input impedance ZoddAnd Zeven, dual-port toroidal cavity resonator it is saturating
Penetrating can be exported with reflectance factor by following formula：
When the molecule of (2) formula is zero, when without transmission, it can obtain with electrical length θtFollowing equation, impedance
Z10, Z1eAnd Z2It can be exported by following formula：
(α+1)cos4θt-2αcos2θt+ α -1=0 (3)
Electrical length θ in formula (3)tDetermined by the impedance ratio α defined in formula (4).It can be predicted by impedance ratio α
The response of resonator.
As shown in Fig. 1 (a), in order to strengthen the relative bandwidth that Capacitance Coupled realizes 11%, square ring resonator is by bilayer
Broadside parallel coupled line is constituted.Double-decker can not only realize high coupled capacitor, but also can use vertical broadside coupled
Line replaces horizontal edge coupling line to reduce size.Stopband is realized by the staged impedance micro-strip by I/O ports on width.Hang down
Straight and horizontal side band lines are designed as W1And W2Width.Vertically and horizontally side band lines have identical length L.Port section micro-strip
The characteristic impedance of line is 50 Ω, and width is W0。L1And W3It is the length and width for the low impedance path being connected with I/O feeder lines respectively.
Complete bandpass filter is assembled in 2 layers of ltcc substrate.Every layer of ltcc substrate is fired with Ferro-A6 materials
There is 0.1mm thickness afterwards, dielectric constant is 5.9, and loss angle tangent is 0.002.AXIEM is the all-wave based on spectrum domain analysis
3 D electromagnetic simulation software, the parameter for optimizing bandpass filter.Final optimal parameter is：W1=0.32mm, W2=
0.3mm, W3=1mm, L1=3mm and L2=1.5mm, wherein parameter are defined on Fig. 1 (b).
Wave filter is realized in 2 layers of LTCC (LTCC) substrate, and uses the broadside with stepped impedance
Parallel coupled line realizes stopband on width.Realize to second harmonic (2fo) 40dB suppression and to frequency 2.4foReach
20dB suppression.
In order to strengthen the relative bandwidth that Capacitance Coupled realizes 11%, square ring resonator is by double-deck broadside parallel coupled line
Constitute.Double-decker can not only realize high coupled capacitor, but also vertical broadside coupled line can be used to replace horizontal edge
Coupling line reduces size.Stopband is realized by the staged impedance micro-strip by I/O ports on width.
Most of dual-mode filters motivate two degenerate modes using input/output (I/O) port of cross feedback
Formula, layout when this causes to be connected with other assemblies is difficult, and nonopiate feedback solves this problem, while double mode band logical is filtered
Ripple device is smaller compared with single mode wave filter.
Further understood for ease of those skilled in the art and implement the present invention, the emulation and measurement of the present invention is now provided
Example.
Because manufacturing tolerance and Material shrinkage are to influence the principal element of LTCC bandpass filter performances, therefore selection has
The parameter W of 10% change1For yield analysis.After 100 results are analyzed, yield rate is 85.85%, as shown in Figure 3.
As a result allow to be manufactured by LTCC.
Measure by Agilent N5230C vector network analyzers and the Cascade with 400 μm of-GSG probes
The plurality of probes testboards of Microtech Summit 9000 are carried out.The centre frequency of measurement is 9GHz, and relative bandwidth is 11%.
The S of measurement21And S11Respectively in the pass-band better than -1.8dB and -12dB.Realize to 2fo(18GHz) 40dB suppression and right
Frequency 2.4fo(23GHz) reaches the expectation index of 20dB suppression.Emulation is as shown in Figure 4 with measurement result.
The size of the bandpass filter proposed is only that 7 × 4 × 0.23mm (does not reserve microstrip line including GSG probe tests
Area), the size is equivalent to 0.54 × 0.27 × 0.0015 λg, λgFor thickness be 0.2mm Ferro A6 substrates in 9.1GHz frequently
The waveguide wavelength of rate, Performance comparision is summarized in the following Table 1.As can be seen that the bandpass filter proposed have it is minimum
Pass band insertion loss and maximally effective second harmonic suppress.
Table 1
Above-mentioned prior art literature is respectively：
[1]Huang,X.D.,and C.H.Cheng,A novel microstripdualmodebandpass filter
with harmonic suppression,IEEE Microwave Wireless compon Lett 16(2006),
pp.404-406.
[2]H.W.Deng,Y.J.Zhao,W.Chen,B.Liu and Y.Y.Liu,Wide upper-stopband
microstripbandpass filter with dualmodeopen loop stepped-impedance resonator
and source-load coupling structure,Microwave Opt Tech Lett 54(2012),pp.1618-
1621.
[3]Jeon,B.K.,Nam,H.,Yoon,K.C.,Jeon,B.W.,Kim,Y.W.,and Lee,J.C.,Design
of a patch dual-mode bandpass filter with second harmonic suppression using
open stubs,IEEE Microwave Conference Proceedings(2010APMC),pp.1106-1109.
In summary, there is wide upper stopband and the double mode bandpass filter of nonopiate feedback the invention discloses a kind of.
Wave filter is realized in 2 layers of LTCC (LTCC) substrate, and uses the broadside parallel coupled with stepped impedance
Line realizes stopband on width.Realize to second harmonic (2fo) 40dB suppression and to frequency 2.4foReach 20dB suppression.
In order to strengthen the relative bandwidth that Capacitance Coupled realizes 11%, square ring resonator is made up of double-deck broadside parallel coupled line.It is double
Rotating fields can not only realize high coupled capacitor, but also vertical broadside coupled line can be used to come instead of horizontal edge coupling line
Reduce size.Stopband is realized by the staged impedance micro-strip by I/O ports on width.Most of dual-mode filters are using just
Input/output (I/O) port of feedback is handed over to motivate two degenerate modes, layout when this causes to be connected with other assemblies is stranded
Difficulty, nonopiate feedback solves this problem, while double mode bandpass filter is smaller compared with single mode wave filter.
The foregoing is only the present invention better embodiment, protection scope of the present invention not using above-mentioned embodiment as
Limit, as long as equivalent modification that those of ordinary skill in the art are made according to disclosed content or change, should all include power
In protection domain described in sharp claim.
Claims (3)
1. a kind of have wide upper stopband and the double mode LTCC bandpass filters of nonopiate feedback, it is characterised in that is distributed in top layer
The metal of ltcc substrate and bottom ltcc substrate and air contact portion is microstrip line, and 2 laminar substrates are connected by metal band-shaped line,
Microstrip line is in stepped shape by two I/O ports, forms the broadside parallel coupled line for realizing wide upper stopband, double-deck broadside
Parallel coupled line constitutes square ring resonator.
2. according to claim 1 have wide upper stopband and the double mode LTCC bandpass filters of nonopiate feedback, it is special
Levy is that the microstrip line of vertical direction and the strip line of horizontal direction have identical length L.
3. according to claim 1 have wide upper stopband and the double mode LTCC bandpass filters of nonopiate feedback, it is special
Levy is that the characteristic impedance of port section microstrip line is 50 Ω.
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| CN201710138152.1A CN106960995A (en) | 2017-03-09 | 2017-03-09 | It is a kind of that there is wide upper stopband and the double mode LTCC bandpass filters of nonopiate feedback |
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| CN201710138152.1A CN106960995A (en) | 2017-03-09 | 2017-03-09 | It is a kind of that there is wide upper stopband and the double mode LTCC bandpass filters of nonopiate feedback |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110034359A (en) * | 2017-12-26 | 2019-07-19 | Tdk株式会社 | Bandpass filter |
| CN110299587A (en) * | 2019-07-19 | 2019-10-01 | 成都频岢微电子有限公司 | A kind of SIW filter and HMSIW filter based on the load of uniform impedance resonator |
| CN112072238A (en) * | 2020-07-31 | 2020-12-11 | 南京邮电大学 | Hairpin-type band-pass filter |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105900197A (en) * | 2014-01-28 | 2016-08-24 | 瑞典爱立信有限公司 | Capacitor structure and capacitor using the same |
-
2017
- 2017-03-09 CN CN201710138152.1A patent/CN106960995A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105900197A (en) * | 2014-01-28 | 2016-08-24 | 瑞典爱立信有限公司 | Capacitor structure and capacitor using the same |
Non-Patent Citations (1)
| Title |
|---|
| BO ZHOU等: ""Wide upper stopband and nonorthogonal I/O feed dual-mode LTCC filter"", 《2016 IEEE INTERNATIONAL SYMPOSIUM ON RADIO-FREQUENCY INTEGRATION TECHNOLOGY (RFIT)》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110034359A (en) * | 2017-12-26 | 2019-07-19 | Tdk株式会社 | Bandpass filter |
| CN110034359B (en) * | 2017-12-26 | 2021-04-16 | Tdk株式会社 | Band-pass filter |
| CN110299587A (en) * | 2019-07-19 | 2019-10-01 | 成都频岢微电子有限公司 | A kind of SIW filter and HMSIW filter based on the load of uniform impedance resonator |
| CN112072238A (en) * | 2020-07-31 | 2020-12-11 | 南京邮电大学 | Hairpin-type band-pass filter |
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