CN108461877A - A kind of transmission zero variable band-pass filter of π types source load coupling - Google Patents
A kind of transmission zero variable band-pass filter of π types source load coupling Download PDFInfo
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- CN108461877A CN108461877A CN201810121810.0A CN201810121810A CN108461877A CN 108461877 A CN108461877 A CN 108461877A CN 201810121810 A CN201810121810 A CN 201810121810A CN 108461877 A CN108461877 A CN 108461877A
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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
The invention discloses a kind of π types source load coupling transmission zero variable band-pass filter, including the first input/output end port, the second input/output end port, interlayer substrate, be arranged interlayer upper surface of base plate upper-layer micro-strip structure and be arranged on the underlying metal floor on interlayer substrate ground；The upper-layer micro-strip structure includes the first parallel coupled line network, the resonator of intermediate short-circuit minor matters loading structure, source load coupling network and the second parallel coupled line network.The pin network (capacitance wherein generated containing varactor) that the present invention is constituted using multiple capacitances loads between source port and load port, it is loaded and is controlled by external dc voltage, can voltage input load cross-couplings, the transmission zero of bandpass filter is controlled, Out-of-band rejection and passband selectivity are effectively improved.
Description
Technical field
The invention belongs to the radio-frequency filter technical fields in wirelessly communicating.It is furtherly to be related to one kind being based on source
Load coupling can the electric bandpass filter adjusted using the transmission zero of pin network.
Background technology
With the continuous maturation of 4G technologies, 5G technologies breed and develop, requirement day of the modern communication technology for hardware
Benefit improves.Due to the rapid raising of communication frequency, the frequency of electromagnetic interference is also higher and higher, and interfering frequency would generally reach GHz,
Even hundreds of GHz or more.Since the frequency of voltage or electric current is higher, radiation is more easy tod produce, exactly these frequencies are very high does
Disturb the problem of signal results in radiation interference getting worse.Therefore, in order to extract useful signal in sophisticated signal, it is invalid to reduce
Signal interference, there is an urgent need to a kind of filter appearance that can have larger decaying to the high-frequency signal of radiation interference.As radio frequency
One of key technical index of filter, how to improve the selectivity of passband becomes the hot issue of many experts and scholars research.
Major design method includes Optimal Filter selectivity at present：1, using the higher filter construction of exponent number.It is such
Filter can be cascaded by two or more filters, but designed filter size is excessive, while filter
Insertion Loss can also increase with cascade increasing for number, be unfavorable for the miniaturization of realization system.
2, optimize circuit structure, using more complicated cavity resonator structure.Patent No. CN106410335D patents of invention carry
Go out a kind of pentagon substrate integrated filter makes signal transmission transmission zero occur using the cross-couplings between five resonant cavities,
Effectively inhibit with outer loss.3, cross coupling structure is formed using source load coupling.The band that patent No. CN 103378387A are proposed
Bandpass filter introduces a kind of weak coupling between input and output feed so that near pass-band generates two transmission zeros, improves
Frequency selectivity.But such weak coupling structure can not change after circuit fixation, cannot also change according to actual needs
Become passband selectivity.
Invention content
Purpose of the present invention is to the deficiencies for existing background technology, provide a kind of biography loading coupling network based on π types source
Defeated zero can electrically adjusted band-pass filter, by external dc voltage adjusting realize pass band transfer zero control, greatly carry
The selectivity of high filter and good Out-of-band rejection.
The technical solution adopted by the present invention is：A kind of transmission zero variable band-pass filter of π types source load coupling, including
First input/output end port, interlayer substrate, is arranged in interlayer upper surface of base plate the second input/output end port
Upper-layer micro-strip structure and be arranged on the underlying metal floor on interlayer substrate ground；
The upper-layer micro-strip structure include the first parallel coupled line network, intermediate short-circuit minor matters loading structure resonator,
Source loads coupling network and the second parallel coupled line network；First parallel coupled line is equal by the first uniform transmission line and second
Even transmission line composition, one end of third uniform transmission line are connected with the first input/output end port, the other end and the first parallel coupling
The first uniform transmission line in line is connected；Second parallel coupled line is by the 4th uniform transmission line and the 5th uniform transmission line group
At one end of the 4th uniform transmission line in the second parallel coupled line is connected with one end of the 6th uniform transmission line, and the 6th uniformly
The other end of transmission line is connected with the second input/output end port；The resonator of short-circuit minor matters loading structure is by the second uniform transmission
Line, the 5th uniform transmission line, the 7th uniform transmission line, the 8th uniform transmission line composition, wherein the second uniform transmission line, the 5th are
Even transmission line, the 7th uniform transmission line are interconnected to constitute resonant cavity, one end and the 7th uniform transmission of the 8th uniform transmission line
The midpoint of line connects, and the other end passes through the first metallic vias short circuit grounding；Source load coupling network is connected to source by pin network
It is realized between load end, the cross coupling structure containing pin network is by the 9th uniform transmission line, the tenth uniform transmission line, the tenth
One uniform transmission line, the 12nd uniform transmission line 13 and capacitance C1, capacitance C2, capacitance C3, varactor D1 and transfiguration
Diode D2 compositions, wherein the left end of the 9th uniform transmission line is connected with the first uniform transmission line, right end and capacitance C1 left ends
It is connected, the left end of the tenth uniform transmission line is connected with the right end of capacitance C1, the right end of the tenth uniform transmission line and the one of capacitance C3
End is connected, the left end of the 11st uniform transmission line is connected with the other end of capacitance C3, right end and the electricity of the 11st uniform transmission line
Hold C2 left ends to be connected, the left end of the 12nd uniform transmission line is connected with the right end of capacitance C2, the other end and the 4th uniform transmission line
It is connected, mono- ends varactor D1 are connected on the tenth uniform transmission line, and the other end passes through the second metallic vias short circuit grounding, transfiguration two
Mono- ends pole pipe D2 are connected on the 11st uniform transmission line, and the other end passes through 15 short circuit grounding of third metallic vias.
Preferably, the first input/output end port network and the second input/output end port network are in same level
On line, and it is symmetrical about medial axis, medial axis is located at the intersection point of the 7th uniform transmission line and the 8th uniform transmission line；First
Uniform transmission line is parallel with the second uniform transmission line, the 4th uniform transmission line and the 5th uniform transmission line.
Varactor D1 cathode are connect with the tenth uniform transmission line in π types of the present invention source load coupling network, and anode is logical
Cross the second metallic vias short circuit grounding.Varactor D2 cathode are connect with the 11st uniform transmission line, and anode passes through third gold
Belong to via short circuit grounding.Capacitance C1, capacitance C2 and capacitance C3 are the composition portion of pin network in the T-type source load coupling network
Point, while capacitance C1 and capacitance C2 are also used for obstructing DC power supply.The transmission zero based on source load coupling can electricity tune band
The cross-couplings of bandpass filter can be led to by accessing direct current power source voltage in varactor D1 and the both ends varactor D2
The external voltage for overregulating varactor changes the equivalent capacity of pin network, to realize the control of transmission zero, changes passband
Selectivity.
The pin network (capacitance wherein generated containing varactor) that the present invention is constituted using multiple capacitances loads on source
It between port and load port, is loaded and is controlled by external dc voltage, so that it may cross-couplings be loaded with voltage input, to band logical
The transmission zero of filter is controlled, and Out-of-band rejection and passband selectivity are effectively improved.
Beneficial effects of the present invention：
1, the adjusting of transmission zero can be adjusted by electricity.The present invention is made using the π type capacitance networks containing varactor
Coupled capacitor between being loaded for source, by the change of external voltage, equivalent capacity also changes correspondingly, and realizes source load coupling
Electricity is adjusted, to realize the filtering performance with different frequency selectivity and stopband rejection characteristic.
2, high-frequency selects characteristic.Source load coupling can respectively introduce a transmission zero in both sides above and below passband, can be with
The motorized adjustment of two zeros is realized by external voltage, realizes high-frequency selectivity.
3, portable strong.The source that π types capacitance network proposed by the invention can be transplanted to other any filters is negative
The control of the raising and Out-of-band rejection of selectivity is obtained between load.
4, inexpensive.Filter construction designed by the invention is only by the additional upper layer and lower layer metal covering structure of single-layer medium plate
At, therefore traditional PCB processing technologys may be used, board cost and processing cost are low.
Description of the drawings
Fig. 1 be transmission zero of the present invention can electrically adjusted band-pass filter structural schematic diagram；
Fig. 2 be transmission zero of the present invention can electrically adjusted band-pass filter upper-layer micro-strip structure schematic diagram；
Fig. 3 is that transmission zero of the present invention can transmission coefficient schematic diagram of the electrically adjusted band-pass filter under different DC voltages；
Fig. 4 is that transmission zero of the present invention can reflectance factor schematic diagram of the electrically adjusted band-pass filter under different DC voltages.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and the present invention is further illustrated.
As shown in Figure 1, in the present invention based on source load coupling transmission zero can electrically adjusted band-pass filter structure include
First input/output end port, the second input/output end port, interlayer substrate and dielectric-slab upper and lower faces metal covering circuit
Structure.
Filter medium plate upper layer metal covering circuit structure as shown in Fig. 2, by the first input/output end port, second input/
Output port, interlayer substrate are arranged in the upper-layer micro-strip structure of interlayer upper surface of base plate and setting in centre
The underlying metal floor composition on layer medium substrate ground；The upper-layer micro-strip structure includes the first parallel coupled line network, centre
Resonator, source load coupling network and the second parallel coupled line network of short-circuit minor matters loading structure；First parallel coupling
Line is made of the first uniform transmission line 3 and the second uniform transmission line 4, one end of third uniform transmission line 16 with first input/it is defeated
Exit port is connected, and the other end is connected with the first uniform transmission line 3 in the first parallel coupled line；Second parallel coupled line by
4th uniform transmission line 6 and the 5th uniform transmission line 7 form, one end of the 4th uniform transmission line 6 in the second parallel coupled line
It is connected with one end of the 6th uniform transmission line 5, the other end of the 6th uniform transmission line 5 is connected with the second input/output end port；It is short
The resonator of road minor matters loading structure is by the second uniform transmission line 4, the 5th uniform transmission line 7, the 7th uniform transmission line the 8, the 8th
Uniform transmission line 9 forms, wherein the second uniform transmission line 4, the 5th uniform transmission line 7, the 7th uniform transmission line 8 are connected with each other structure
At resonant cavity, one end of the 8th uniform transmission line 9 is connect with the midpoint of the 7th uniform transmission line 8, and the other end passes through the first metal
Via short circuit grounding；Source load coupling network, which is connected to by pin network between source and load end, to be realized, the friendship containing pin network
Coupled structure is pitched uniformly to be passed by the 9th uniform transmission line 10, the tenth uniform transmission line 11, the 11st uniform transmission line the 12, the 12nd
Defeated line 13 and capacitance C1, capacitance C2, capacitance C3, varactor D1 and varactor D2 compositions, wherein the 9th uniformly passes
The left end of defeated line 10 is connected with the first uniform transmission line 3, and right end is connected with capacitance C1 left ends, a left side for the tenth uniform transmission line 11
End is connected with the right end of capacitance C1, and the right end of the tenth uniform transmission line 11 is connected with one end of capacitance C3, the 11st uniform transmission
The left end of line 12 is connected with the other end of capacitance C3, and the right end of the 11st uniform transmission line 12 is connected with capacitance C2 left ends, and the tenth
The left end of two uniform transmission lines 13 is connected with the right end of capacitance C2, and the other end is connected with the 4th uniform transmission line 6, varactor
Mono- ends D1 are connected on the tenth uniform transmission line 11, and the other end passes through 14 short circuit grounding of the second metallic vias, the one end varactor D2
It is connected on the 11st uniform transmission line 12, the other end passes through 15 short circuit grounding of third metallic vias.
Medium substrate used by filter in the embodiment of the present invention is Rogers RT/duroid 4003, and thickness is
0.508mm, metal copper foil thickness are 0.02mm.Capacitance C1 and capacitance C2 is capacitance, and 0.5pf, capacitance C3 is taken to take 0.5pf.
Varactor D1, varactor D2 are realized using JDV2S71E model diodes.External dc electricity potential source anode and the tenth
Uniform transmission line 11 and the connection of the 11st uniform transmission line 12, voltage source negative pole and the second metallic vias 14 and third metallic vias
15 connections.By the adjusting control varactor capacitance size of external dc electricity potential source, to control the source load of pin network
Stiffness of coupling.
As shown in figure 3, transmission coefficient curve synoptic diagram of the filter in the embodiment of the present invention under different applied voltages.
Respectively there are one transmission zeros for passband both sides, and when applied voltage changes to 16V from 7v, transmission zero is close to passband, passband choosing
Selecting property is improved, but stopband inhibition is weakened therewith.Fig. 4 be transmission zero of the present invention can electrically adjusted band-pass filter exist
Reflectance factor schematic diagram under different DC voltages, external voltage do not change in passband substantially when electricity adjusts voltage input load coupling
Reflection characteristic.
Certainly, the representative instance of the above only present invention, in addition to this, the present invention can also have other a variety of specific implementations
Mode, all technical solutions formed using equivalent substitution or equivalent transformation, is all fallen within the scope of protection of present invention.
Claims (2)
1. a kind of transmission zero variable band-pass filter of π types source load coupling, it is characterised in that：Including the first input/output
The second input/output end port, interlayer substrate, upper layer micro-strip knot in interlayer upper surface of base plate is arranged in port
Structure and it is arranged on the underlying metal floor on interlayer substrate ground；
The upper-layer micro-strip structure includes that the first parallel coupled line network, the resonator of intermediate short-circuit minor matters loading structure, source are negative
Carry coupling network and the second parallel coupled line network；First parallel coupled line is uniformly passed by the first uniform transmission line and second
Defeated line composition, one end of third uniform transmission line is connected with the first input/output end port, in the other end and the first parallel coupled line
The first uniform transmission line be connected；Second parallel coupled line is made of the 4th uniform transmission line and the 5th uniform transmission line,
One end of the 4th uniform transmission line in second parallel coupled line is connected with one end of the 6th uniform transmission line, the 6th uniform transmission
The other end of line is connected with the second input/output end port；The resonator of short-circuit minor matters loading structure is by the second uniform transmission line,
Five uniform transmission lines, the 7th uniform transmission line, the 8th uniform transmission line composition, wherein the second uniform transmission line, the 5th uniform biography
Defeated line, the 7th uniform transmission line are interconnected to constitute resonant cavity, one end and the 7th uniform transmission line of the 8th uniform transmission line
Midpoint connects, and the other end passes through the first metallic vias short circuit grounding；Source loads coupling network and is connected to source by pin network and is born
Carry end between realize, the cross coupling structure containing pin network by the 9th uniform transmission line, the tenth uniform transmission line, the 11st
Even transmission line, the 12nd uniform transmission line 13 and capacitance C1, capacitance C2, two pole capacitance C3, varactor D1 and transfiguration
Pipe D2 composition, wherein the left end of the 9th uniform transmission line is connected with the first uniform transmission line, right end is connected with capacitance C1 left ends,
The left end of tenth uniform transmission line is connected with the right end of capacitance C1, the right end of the tenth uniform transmission line and one end phase of capacitance C3
Even, the left end of the 11st uniform transmission line is connected with the other end of capacitance C3, right end and the capacitance C2 of the 11st uniform transmission line
Left end is connected, and the left end of the 12nd uniform transmission line is connected with the right end of capacitance C2, and the other end is connected with the 4th uniform transmission line,
Mono- ends varactor D1 are connected on the tenth uniform transmission line, and the other end passes through the second metallic vias short circuit grounding, varactor
Mono- ends D2 are connected on the 11st uniform transmission line, and the other end passes through 15 short circuit grounding of third metallic vias.
2. a kind of transmission zero variable band-pass filter of load coupling in π types source according to claim 1, feature exist
In：The first input/output end port network and the second input/output end port network are in same horizontal line, and about in
Between axisymmetrical, medial axis is located at the intersection point of the 7th uniform transmission line and the 8th uniform transmission line；First uniform transmission line with
Second uniform transmission line, the 4th uniform transmission line and the 5th uniform transmission line are parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810121810.0A CN108461877A (en) | 2018-02-07 | 2018-02-07 | A kind of transmission zero variable band-pass filter of π types source load coupling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810121810.0A CN108461877A (en) | 2018-02-07 | 2018-02-07 | A kind of transmission zero variable band-pass filter of π types source load coupling |
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| CN108461877A true CN108461877A (en) | 2018-08-28 |
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| CN201810121810.0A Pending CN108461877A (en) | 2018-02-07 | 2018-02-07 | A kind of transmission zero variable band-pass filter of π types source load coupling |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201503900U (en) * | 2009-09-22 | 2010-06-09 | 华南理工大学 | Source-end coupling microstrip filter |
| DE102013017296A1 (en) * | 2013-10-18 | 2015-04-23 | IAD Gesellschaft für Informatik, Automatisierung und Datenverarbeitung mbH | Variable microstrip bandpass filter based on coupled λ / 4 resonators |
| CN105048033A (en) * | 2015-06-23 | 2015-11-11 | 南京理工大学 | Adjustable microstrip band-pass filter with adjustable center frequency and invariable absolute bandwidth |
| CN106207335A (en) * | 2016-08-24 | 2016-12-07 | 华东交通大学 | A kind of adjustable reconfigurable band filter |
| CN106936417A (en) * | 2017-04-24 | 2017-07-07 | 华南理工大学 | A kind of miniaturization filtered switch based on quasi- lumped parameter |
-
2018
- 2018-02-07 CN CN201810121810.0A patent/CN108461877A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201503900U (en) * | 2009-09-22 | 2010-06-09 | 华南理工大学 | Source-end coupling microstrip filter |
| DE102013017296A1 (en) * | 2013-10-18 | 2015-04-23 | IAD Gesellschaft für Informatik, Automatisierung und Datenverarbeitung mbH | Variable microstrip bandpass filter based on coupled λ / 4 resonators |
| CN105048033A (en) * | 2015-06-23 | 2015-11-11 | 南京理工大学 | Adjustable microstrip band-pass filter with adjustable center frequency and invariable absolute bandwidth |
| CN106207335A (en) * | 2016-08-24 | 2016-12-07 | 华东交通大学 | A kind of adjustable reconfigurable band filter |
| CN106936417A (en) * | 2017-04-24 | 2017-07-07 | 华南理工大学 | A kind of miniaturization filtered switch based on quasi- lumped parameter |
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Application publication date: 20180828 |
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