CN110492863A - A kind of filter circuit suitable for LTCC filter - Google Patents
A kind of filter circuit suitable for LTCC filter Download PDFInfo
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- CN110492863A CN110492863A CN201910859581.7A CN201910859581A CN110492863A CN 110492863 A CN110492863 A CN 110492863A CN 201910859581 A CN201910859581 A CN 201910859581A CN 110492863 A CN110492863 A CN 110492863A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/0115—Frequency selective two-port networks comprising only inductors and capacitors
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/0153—Electrical filters; Controlling thereof
- H03H7/0161—Bandpass filters
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Abstract
The present invention relates to wave filter technology fields, disclose a kind of filter circuit suitable for LTCC filter, including elliptic function band logical unit, and the elliptic function band logical unit includes multiple inductance interconnected and capacitor.The present invention is converted the layout type of each inductance in existing ellipse function filter circuit, it is the inductance for being parallel to ground by concatenated inductive transduction, T-type inductance network is transformed to by π type inductance network, pass through the transformation of inductance network, an implicit equivalent inductance is generated using the coupling between inductance, form T-type inductance network, reduce the quantity of actual inductance, reduce inductance value distribution, the coupling between inductance is utilized simultaneously, be conducive to compactly layout L TCC filter, inductance the space occupied reduced, to improve the performance of LTCC filter.
Description
Technical field
The present invention relates to wave filter technology fields, in particular to a kind of filter circuit suitable for LTCC filter.
Background technique
LTCC low-temperature co-fired ceramics (Low Temperature Co-fired Ceramic) technology has become passive collection
At mainstream technology.LTCC filter is used widely with its compact-sized compact, it prints gold using multi-layer ceramics
Belong to slurry to realize inductance, capacitor.Substantially most of LTCC filters belong to the LC filter (electricity i.e. by that can distinguish
Sense, capacitor are realized), and the inductance value of inductance is bigger, the space occupied is bigger, the coupling being more easy to happen between inductance, make
The characteristic of filter deviates from the prototype designed originally.Therefore the design of LTCC filter can be tended to reduce inductance value and reduce electricity
Feel quantity.
The circuit diagram of elliptic Function Bandpass Filters is as shown in Figure 1, its ideal simulation curve is as shown in Figure 2.By Fig. 1
Ellipse function filter circuit be applied in LTCC filter, due to LTCC filter small volume, inductance the space occupied compared with
Greatly, coupling is easy to happen between inductance to impact performance of filter, and actual emulation curve is as shown in Figure 3.Based on Fig. 1 institute
The circuit diagram shown, each inductance value that simulation calculation goes out filter is L1:15.7nH, L2:63nH, L3:6.6nH, L4:
3.8nH,L5:5.1nH,L6:22nH,L7:7.8nH；Each capacitance is C1:3.5pF, C2:2.8pF, C3:15.2pF, C4:
26pF,C5:6.8pF,C6:12.8pF,C7:12.8pF.Inductance value distribution is larger, from 3.8nH to 63nH, to LTCC technique
For, the inductance of 63nH and 22nH are especially difficult in compact small size to be realized, unavoidably be will appear and is unexpectedly coupled and shadow
Ring the characteristic of filter.
Summary of the invention
The present invention provides a kind of filter circuit suitable for LTCC filter, is based on above-mentioned elliptic Function Bandpass Filters
Circuit makes improvements, to adapt to the filter of LTCC technique.
A technical solution of the invention are as follows: a kind of filter circuit suitable for LTCC filter, including single order ellipse letter
Number band logical unit, the single order elliptic function band logical unit includes first capacitor C1, the second capacitor C2, third capacitor C3, the 4th
Capacitor C4, the first inductance L1, the second inductance L2, third inductance L3, the 4th inductance L4；The first end of the first inductance L1,
The first end of two capacitor C2, the first end of the second inductance L2 are connect with the first end of third capacitor C3, the first inductance L1
Second end and the second end of the second capacitor C2 connect with the first end of first capacitor C1, the second end of the second inductance L2
It is connect with the first end of the first end of third inductance L3 and the 4th inductance L4, the second end and third of the first capacitor C1
The second end of inductance L3 is connect with the first end of the 4th capacitor C4, the second end of the third capacitor C3 and the 4th inductance L4's
Second end is connect with the second end of the 4th capacitor C4.
Wherein, the 4th inductance L4 is the equivalent inductance for being coupled with third inductance L3 by the second inductance L2 and being formed.
Another technical solution of the invention are as follows: a kind of filter circuit suitable for LTCC filter, including Some Second Order Elliptic
Function band logical unit, the Some Second Order Elliptic function band logical unit include first capacitor C1, the second capacitor C2, third capacitor C3,
Four capacitor C4, the 5th capacitor C5, the 6th capacitor C6, the 7th capacitor C7, the first inductance L1, the second inductance L2, third inductance L3,
Four inductance L4, the 5th inductance L5, the 6th inductance L6, the 7th inductance L7, the 8th inductance L8；
The first end of the first inductance L1, the first end of the second capacitor C2, the first end of the second inductance L2 are and third
The first end of capacitor C3 connects, and the second end of the first inductance L1 and the second end of the second capacitor C2 are with first capacitor C1's
First end connection, the second end of the second inductance L2 and the first end of third inductance L3 and the first end of the 4th inductance L4 connect
It connects；
The second end of the first capacitor C1, the second end of third inductance L3, the first end of the 5th inductance L5, the 6th capacitor
The first end of C6, the first end of the 6th inductance L6 are connect with the first end of the 4th capacitor C4, and the second of the 5th inductance L5
The second end of end and the 6th capacitor C6 are connect with the first end of the 5th capacitor C5, the second end and the 7th of the 6th inductance L6
The first end of inductance L7 and the connection of the first end of the 8th inductance L8, the second end and the 7th inductance L7 of the 5th capacitor C5
Second end connect with the first end of the 7th capacitor C7, second end, the second end of the 4th inductance L4, of the third capacitor C3
The second end of four capacitor C4, the second end of the 8th inductance L8 are connect with the second end of the 7th capacitor C7.
Wherein, the 4th inductance L4 is the equivalent inductance for being coupled with third inductance L3 by the second inductance L2 and being formed, institute
Stating the 8th inductance L8 is the equivalent inductance for being coupled with the 7th inductance L7 by the 6th inductance L6 and being formed.
Third technical solution of the invention are as follows: a kind of filter circuit suitable for LTCC filter, including three ranks are oval
Function band logical unit, the three ranks elliptic function band logical unit include first capacitor C1, the second capacitor C2, third capacitor C3,
Four capacitor C4, the 5th capacitor C5, the 6th capacitor C6, the 7th capacitor C7, the 8th capacitor C8, the 9th capacitor C9, the tenth capacitor C10,
First inductance L1, the second inductance L2, third inductance L3, the 4th inductance L4, the 5th inductance L5, the 6th inductance L6, the 7th inductance L7,
8th inductance L8, the 9th inductance L9, the tenth inductance L10, the 11st inductance L11, the 12nd inductance L12；
The first end of the first inductance L1, the first end of the second capacitor C2, the first end of the second inductance L2 are and third
The first end of capacitor C3 connects, and the second end of the first inductance L1 and the second end of the second capacitor C2 are with first capacitor C1's
First end connection, the second end of the second inductance L2 and the first end of third inductance L3 and the first end of the 4th inductance L4 connect
It connects, the second end of the first capacitor C1, the second end of third inductance L3, the first end of the 5th inductance L5, the 6th capacitor C6
First end, the first end of the 6th inductance L6 are connect with the first end of the 4th capacitor C4, the second end of the 5th inductance L5 with
And the 6th the second end of capacitor C6 connect with the first end of the 5th capacitor C5, the second end and the 7th inductance of the 6th inductance L6
The first end of L7 and the connection of the first end of the 8th inductance L8；
Second end, second end, the first end of the 9th inductance L9, the 9th capacitor of the 7th inductance L7 of the 5th capacitor C5
The first end of C9, the first end of the tenth inductance L10 are connect with the first end of the 7th capacitor C7, and the second of the 9th inductance L9
End and the second end of the 9th capacitor C9 are connect with the first end of the 8th capacitor C8, the second end of the tenth inductance L10 and the
The first end of 11 inductance L11 and the connection of the first end of the 12nd inductance L12, the second end of the 8th capacitor C8 and the
The second end of 11 inductance L11 is connect with the first end of the tenth capacitor C10；
Second end, second end, the second end of the 4th capacitor C4, the 8th inductance of the 4th inductance L4 of the third capacitor C3
The second end of L8, the second end of the 7th capacitor C7, the second end of the 12nd inductance L12 connect with the second end of the tenth capacitor C10
It connects.
Wherein, the 4th inductance L4 is the equivalent inductance for being coupled with third inductance L3 by the second inductance L2 and being formed, institute
Stating the 8th inductance L8 is the equivalent inductance for being coupled with the 7th inductance L7 by the 6th inductance L6 and being formed, the 12nd inductance L12
It is the equivalent inductance for being coupled with the 11st inductance L11 by the tenth inductance L10 and being formed.
The beneficial effects of the present invention are:
Compared with existing elliptic Function Bandpass Filters circuit, the present invention is by the layout type of inductance each in available circuit
It is converted, is the inductance for being parallel to ground by concatenated inductive transduction, i.e., T-type inductance network is transformed to by π type inductance network,
Reduce inductance value by network transformation.Due to LTCC filter small volume, and inductance the space occupied is larger, between inductance
It is easy to happen coupling to impact performance of filter, in the prior art, spacing between each inductance is made when being laid out inductance as far as possible
Greatly, to reduce the coupling between each inductance.However, transformation of the present invention by inductance network, using the coupling between inductance come
An implicit equivalent inductance is generated, T-type inductance network is formed, reduces the quantity of actual inductance, reduces inductance value distribution,
Simultaneously using the coupling between inductance, be conducive to compactly layout L TCC filter, inductance the space occupied reduced, to improve
The performance of LTCC filter.
Detailed description of the invention
Fig. 1 is the circuit diagram of existing elliptic Function Bandpass Filters；
Fig. 2 is the ideal simulation curve of the elliptic Function Bandpass Filters of Fig. 1；
Fig. 3 is the actual emulation curve of the elliptic Function Bandpass Filters of Fig. 1；
Fig. 4 is the equivalent circuit schematic of the embodiment of the present invention 1；
Fig. 5 is the circuit diagram of the embodiment of the present invention 1；
Fig. 6 is the equivalent circuit schematic of the embodiment of the present invention 2；
Fig. 7 is the equivalent circuit schematic of the embodiment of the present invention 3.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached in the embodiment of the present invention
Figure, technical scheme in the embodiment of the invention is clearly and completely described.
Embodiment 1
As shown in figure 4, the present embodiment provides a kind of filter circuit suitable for LTCC filter, including Some Second Order Elliptic function
Band logical unit, the Some Second Order Elliptic function band logical unit include first capacitor C1, the second capacitor C2, third capacitor C3, the 4th electricity
Hold C4, the 5th capacitor C5, the 6th capacitor C6, the 7th capacitor C7, the first inductance L1, the second inductance L2, third inductance L3, the 4th electricity
Feel L4, the 5th inductance L5, the 6th inductance L6, the 7th inductance L7, the 8th inductance L8.
The first end of the first inductance L1, the first end of the second capacitor C2, the first end of the second inductance L2 are and third
The first end of capacitor C3 connects, and the second end of the first inductance L1 and the second end of the second capacitor C2 are with first capacitor C1's
First end connection, the second end of the second inductance L2 and the first end of third inductance L3 and the first end of the 4th inductance L4 connect
It connects.
The second end of the first capacitor C1, the second end of third inductance L3, the first end of the 5th inductance L5, the 6th capacitor
The first end of C6, the first end of the 6th inductance L6 are connect with the first end of the 4th capacitor C4, and the second of the 5th inductance L5
The second end of end and the 6th capacitor C6 are connect with the first end of the 5th capacitor C5, the second end and the 7th of the 6th inductance L6
The first end of inductance L7 and the connection of the first end of the 8th inductance L8, the second end and the 7th inductance L7 of the 5th capacitor C5
Second end connect with the first end of the 7th capacitor C7, second end, the second end of the 4th inductance L4, of the third capacitor C3
The second end of four capacitor C4, the second end of the 8th inductance L8 are connect with the second end of the 7th capacitor C7.
As shown in figure 5, the 4th inductance L4 in the present embodiment is to be coupled with third inductance L3 by the second inductance L2 and formed
Implicit equivalent inductance, the 8th inductance L8 is the implicit equivalent inductance for being coupled with the 7th inductance L7 by the 6th inductance L6 and being formed.
Fig. 5 is the circuit diagram of the present embodiment, and Fig. 4 is the equivalent circuit schematic of Fig. 5, and the circuit diagram of the present embodiment is substantial
Including the first inductance L1, the second inductance L2, third inductance L3, the 5th inductance L5, the 6th inductance L6, the 7th inductance L7 totally six electricity
Sense, compared with circuit diagram shown in FIG. 1, reduces inductance quantity.The basis of present invention circuit diagram shown in Fig. 1
On improved, the layout type of inductance each in available circuit is converted, by concatenated inductive transduction be parallel to
The inductance on ground, i.e., the π type inductance network of L2, L3, L4 (and L4, L5, L6) composition as shown in Figure 1 are transformed to shown in Fig. 4
L2, L3, L4 (and L6, L7, L8) T-type inductance network, including two converter units.
T-type inductance network, transformation for mula are transformed to from π type inductance network are as follows: L2=(L2*L4)/(L2+L3+L4), L4
=(L2*L3)/(L2+L3+L4), L3=(L3*L4)/(L2+L3+L4).It can be according to existing elliptic function by above-mentioned formula
The inductance value that band pass filter circuit simulation calculation goes out, calculates the correspondence inductance value of T-type inductance network.It is disclosed in background technique
Existing elliptic Function Bandpass Filters circuit simulation calculated each inductance value is L1:15.7nH, L2:63nH, L3:
The inductance value is substituted into above-mentioned formula, this can be calculated by 6.6nH, L4:3.8nH, L5:5.1nH, L6:22nH, L7:7.8nH
Each inductance value of the filter circuit of invention is L2:5.5nH, L3:5.9nH, L4:0.6nH, L6:4.8nH, L8:1.9nH, L7:
5.0nH, wherein L1:15.7nH, L5:5.1nH are identical as initial value, and each capacitance is identical as initial value.As can be seen that transformed ellipse
The inductance value distribution of circular function bandwidth-limited circuit reduces, from 0.6nH to 15.7nH, for LTCC technique, 0.6nH this
The small inductor of sample is easily achieved.Due to LTCC filter small volume, and inductance the space occupied is larger, between inductance
It is easy to happen coupling to impact performance of filter, therefore, the spacing between each inductance is made when being laid out inductance in the prior art
It is big as far as possible, to reduce the coupling between each inductance.The present invention is produced by the transformation of inductance network using the coupling between inductance
A raw implicit equivalent inductance, forms T-type inductance network, reduces the quantity of actual inductance, reduces inductance value distribution, together
Coupling between Shi Liyong inductance is conducive to compactly layout L TCC filter, inductance the space occupied is reduced, to improve
The performance of LTCC filter, so that the actual emulation curve of filter circuit of the invention is emulated closer to ideal shown in Fig. 2
Curve.
Embodiment 2
As shown in figure 5, the present embodiment provides a kind of filter circuit suitable for LTCC filter, including single order elliptic function
Band logical unit, the single order elliptic function band logical unit include first capacitor C1, the second capacitor C2, third capacitor C3, the 4th electricity
Hold C4, the first inductance L1, the second inductance L2, third inductance L3, the 4th inductance L4.The first end of the first inductance L1, second
The first end of capacitor C2, the first end of the second inductance L2 are connect with the first end of third capacitor C3, the first inductance L1's
Second end and the second end of the second capacitor C2 are connect with the first end of first capacitor C1, the second end of the second inductance L2 with
The first end of third inductance L3 and the first end connection of the 4th inductance L4, second end and the third electricity of the first capacitor C1
The second end of sense L3 is connect with the first end of the 4th capacitor C4, and the of the second end of the third capacitor C3 and the 4th inductance L4
Two ends are connect with the second end of the 4th capacitor C4.
The present embodiment is single order elliptic function bandwidth-limited circuit, including one is transformed to T-type inductance from π type inductance network
The converter unit of network, principle is identical with embodiment 1, i.e. the 4th inductance L4 is to be coupled by the second inductance L2 with third inductance L3
And the implicit equivalent inductance formed.The circuit structure of the single order elliptic function bandwidth-limited circuit is relatively simple, and inductance quantity is few,
Suitable for the smaller LTCC filter of volume.
Embodiment 3
As shown in fig. 6, the present embodiment provides a kind of filter circuit suitable for LTCC filter, including three rank elliptic functions
Band logical unit, the three ranks elliptic function band logical unit include first capacitor C1, the second capacitor C2, third capacitor C3, the 4th electricity
Hold C4, the 5th capacitor C5, the 6th capacitor C6, the 7th capacitor C7, the 8th capacitor C8, the 9th capacitor C9, the tenth capacitor C10, first
Inductance L1, the second inductance L2, third inductance L3, the 4th inductance L4, the 5th inductance L5, the 6th inductance L6, the 7th inductance L7, the 8th
Inductance L8, the 9th inductance L9, the tenth inductance L10, the 11st inductance L11, the 12nd inductance L12.
The first end of the first inductance L1, the first end of the second capacitor C2, the first end of the second inductance L2 are and third
The first end of capacitor C3 connects, and the second end of the first inductance L1 and the second end of the second capacitor C2 are with first capacitor C1's
First end connection, the second end of the second inductance L2 and the first end of third inductance L3 and the first end of the 4th inductance L4 connect
It connects, the second end of the first capacitor C1, the second end of third inductance L3, the first end of the 5th inductance L5, the 6th capacitor C6
First end, the first end of the 6th inductance L6 are connect with the first end of the 4th capacitor C4, the second end of the 5th inductance L5 with
And the 6th the second end of capacitor C6 connect with the first end of the 5th capacitor C5, the second end and the 7th inductance of the 6th inductance L6
The first end of L7 and the connection of the first end of the 8th inductance L8.
Second end, second end, the first end of the 9th inductance L9, the 9th capacitor of the 7th inductance L7 of the 5th capacitor C5
The first end of C9, the first end of the tenth inductance L10 are connect with the first end of the 7th capacitor C7, and the second of the 9th inductance L9
End and the second end of the 9th capacitor C9 are connect with the first end of the 8th capacitor C8, the second end of the tenth inductance L10 and the
The first end of 11 inductance L11 and the connection of the first end of the 12nd inductance L12, the second end of the 8th capacitor C8 and the
The second end of 11 inductance L11 is connect with the first end of the tenth capacitor C10.
Second end, second end, the second end of the 4th capacitor C4, the 8th inductance of the 4th inductance L4 of the third capacitor C3
The second end of L8, the second end of the 7th capacitor C7, the second end of the 12nd inductance L12 connect with the second end of the tenth capacitor C10
It connects.
The present embodiment is three rank elliptic function bandwidth-limited circuits, including three are transformed to T-type inductance from π type inductance network
The converter unit of network, principle is identical with embodiment 1, i.e. the 4th inductance L4 is to be coupled by the second inductance L2 with third inductance L3
And the implicit equivalent inductance formed, the 8th inductance L8 are to be coupled by the 6th inductance L6 with the 7th inductance L7 and implying for being formed is equivalent
Inductance, the 12nd inductance L12 are the implicit equivalent inductances for being coupled with the 11st inductance L11 by the tenth inductance L10 and being formed.Filtering
The order of device circuit is more, and intermediate zone is narrower, and selectivity is higher, and curve is more precipitous, the three ranks elliptic function bandwidth-limited circuit
Suitable for the higher LTCC filter of selectivity.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of filter circuit suitable for LTCC filter, which is characterized in that described including single order elliptic function band logical unit
Single order elliptic function band logical unit includes first capacitor C1, the second capacitor C2, third capacitor C3, the 4th capacitor C4, the first inductance
L1, the second inductance L2, third inductance L3, the 4th inductance L4；
The first end of the first inductance L1, the first end of the second capacitor C2, the first end of the second inductance L2 with third capacitor
The first end of C3 connects, and the first of the second end of the first inductance L1 and the second end of the second capacitor C2 and first capacitor C1
End connection, the second end of the second inductance L2 are connect with the first end of the first end of third inductance L3 and the 4th inductance L4,
The second end of the first capacitor C1 and the second end of third inductance L3 are connect with the first end of the 4th capacitor C4, the third
The second end of capacitor C3 and the second end of the 4th inductance L4 are connect with the second end of the 4th capacitor C4.
2. the filter circuit according to claim 1 suitable for LTCC filter, which is characterized in that the 4th inductance L4
It is the equivalent inductance for being coupled with third inductance L3 by the second inductance L2 and being formed.
3. a kind of filter circuit suitable for LTCC filter, which is characterized in that described including Some Second Order Elliptic function band logical unit
Some Second Order Elliptic function band logical unit includes first capacitor C1, the second capacitor C2, third capacitor C3, the 4th capacitor C4, the 5th capacitor
C5, the 6th capacitor C6, the 7th capacitor C7, the first inductance L1, the second inductance L2, third inductance L3, the 4th inductance L4, the 5th inductance
L5, the 6th inductance L6, the 7th inductance L7, the 8th inductance L8；
The first end of the first inductance L1, the first end of the second capacitor C2, the first end of the second inductance L2 with third capacitor
The first end of C3 connects, and the first of the second end of the first inductance L1 and the second end of the second capacitor C2 and first capacitor C1
End connection, the second end of the second inductance L2 are connect with the first end of the first end of third inductance L3 and the 4th inductance L4；
The second end of the first capacitor C1, the second end of third inductance L3, the first end of the 5th inductance L5, the 6th capacitor C6
First end, the first end of the 6th inductance L6 are connect with the first end of the 4th capacitor C4, the second end of the 5th inductance L5 with
And the 6th the second end of capacitor C6 connect with the first end of the 5th capacitor C5, the second end and the 7th inductance of the 6th inductance L6
The of the first end of L7 and the connection of the first end of the 8th inductance L8, the second end of the 5th capacitor C5 and the 7th inductance L7
Two ends are connect with the first end of the 7th capacitor C7, the second end of the third capacitor C3, the second end of the 4th inductance L4, the 4th electricity
Second end, the second end of the 8th inductance L8 for holding C4 are connect with the second end of the 7th capacitor C7.
4. the filter circuit according to claim 3 suitable for LTCC filter, which is characterized in that the 4th inductance L4
The equivalent inductance for being coupled with third inductance L3 by the second inductance L2 and being formed, the 8th inductance L8 be by the 6th inductance L6 with
The equivalent inductance of 7th inductance L7 coupling and formation.
5. a kind of filter circuit suitable for LTCC filter, which is characterized in that described including three rank elliptic function band logical units
Three rank elliptic function band logical units include first capacitor C1, the second capacitor C2, third capacitor C3, the 4th capacitor C4, the 5th capacitor
C5, the 6th capacitor C6, the 7th capacitor C7, the 8th capacitor C8, the 9th capacitor C9, the tenth capacitor C10, the first inductance L1, the second electricity
Feel L2, third inductance L3, the 4th inductance L4, the 5th inductance L5, the 6th inductance L6, the 7th inductance L7, the 8th inductance L8, the 9th electricity
Feel L9, the tenth inductance L10, the 11st inductance L11, the 12nd inductance L12；
The first end of the first inductance L1, the first end of the second capacitor C2, the first end of the second inductance L2 with third capacitor
The first end of C3 connects, and the first of the second end of the first inductance L1 and the second end of the second capacitor C2 and first capacitor C1
End connection, the second end of the second inductance L2 are connect with the first end of the first end of third inductance L3 and the 4th inductance L4,
The second end of the first capacitor C1, the second end of third inductance L3, the first end of the 5th inductance L5, the 6th capacitor C6 first
End, the 6th inductance L6 first end connect with the first end of the 4th capacitor C4, the second end of the 5th inductance L5 and the
The second end of six capacitor C6 is connect with the first end of the 5th capacitor C5, and the second end of the 6th inductance L6 is with the 7th inductance L7's
First end and the connection of the first end of the 8th inductance L8；
The second end of the 5th capacitor C5, the second end of the 7th inductance L7, the first end of the 9th inductance L9, the 9th capacitor C9
First end, the first end of the tenth inductance L10 are connect with the first end of the 7th capacitor C7, the second end of the 9th inductance L9 with
And the 9th the second end of capacitor C9 connect with the first end of the 8th capacitor C8, the second end and the 11st of the tenth inductance L10
The first end of inductance L11 and the connection of the first end of the 12nd inductance L12, the second end and the 11st of the 8th capacitor C8
The second end of inductance L11 is connect with the first end of the tenth capacitor C10；
The second end of the third capacitor C3, the second end of the 4th inductance L4, the second end of the 4th capacitor C4, the 8th inductance L8
Second end, the second end of the 7th capacitor C7, the second end of the 12nd inductance L12 are connect with the second end of the tenth capacitor C10.
6. the filter circuit according to claim 5 suitable for LTCC filter, which is characterized in that the 4th inductance L4
The equivalent inductance for being coupled with third inductance L3 by the second inductance L2 and being formed, the 8th inductance L8 be by the 6th inductance L6 with
The equivalent inductance of 7th inductance L7 coupling and formation, the 12nd inductance L12 is by the tenth inductance L10 and the 11st inductance
The equivalent inductance of L11 coupling and formation.
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| CN112599944A (en) * | 2020-11-30 | 2021-04-02 | 湖南迈克森伟电子科技有限公司 | Miniaturized high-suppression adjustable cavity filter |
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