CN103606724B - A kind of power apparatus and microstrip filter thereof - Google Patents
A kind of power apparatus and microstrip filter thereof Download PDFInfo
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- CN103606724B CN103606724B CN201310603200.1A CN201310603200A CN103606724B CN 103606724 B CN103606724 B CN 103606724B CN 201310603200 A CN201310603200 A CN 201310603200A CN 103606724 B CN103606724 B CN 103606724B
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Abstract
The invention discloses a kind of power apparatus and microstrip filter thereof, this microstrip filter includes at least two unit, each unit all includes the second microstrip line, the 3rd microstrip line, the first electric capacity, wherein the second microstrip line has the first end and the second end, one end of first electric capacity is connected to the second end of the second microstrip line, and another termination is with reference to ground；Second end of one termination the second microstrip line of the 3rd microstrip line, the other end is opened a way or connects with reference to ground；And connected by the first microstrip line symmetry between adjacent two unit, symmetry is connected as: the first end of the second microstrip line of adjacent two unit is connected by the first microstrip line, or the second end of the second microstrip line of adjacent two unit is connected by the first microstrip line.Each unit the most also includes the second electric capacity, and the first end of the first described second microstrip line of termination of the second electric capacity, the second termination of the second electric capacity is with reference to ground.Implement technical scheme, take that pcb board area is little, the design of low cost, structure is simple.
Description
Technical field
The present invention relates to the communications field, particularly relate to a kind of power apparatus and microstrip filter thereof.
Background technology
It is a kind of very important device at microwave system median filter.Wave filter mainly have LC wave filter and
Microstrip filter two class, wherein, LC wave filter is made up of high-power inductance and electric capacity, as it is shown in figure 1,
LC wave filter is present stage the most widely used a kind of filter construction；Microstrip filter by microstrip line and
Microstrip stubs is constituted, as shown in Figure 2.
In present stage, the operating frequency high-power field less than 500MHz mainly uses LC wave filter, its tool
There are the features such as design is simple, volume is little.But, inductance is due to by self machining accuracy, welding, stress shape
The factors such as change affect and cause uniformity poor.And, high-power inductance is substantially more expensive, and is unfavorable for carrying
High product competitiveness.It addition, high-power inductance height used in LC wave filter is higher, a large amount of magnetic lines of force
Not Guan Bi, is affected by ambient magnetic field environment relatively big, is brought all to the design of shielding cavity and product structure
The most difficult.For microstripline filter, it is rarely used in the operating frequency power apparatus less than 500MHz,
Mainly due to when frequency is low, needing microstrip line length the longest, the area taking pcb board is very big, no
It is beneficial to commercialization.
Summary of the invention
The technical problem to be solved in the present invention is, for prior art above-mentioned take pcb board area big,
Cost is high, the defect of complex structural designs, it is provided that one takies that pcb board area is little, low cost, structure set
Count simple power apparatus and microstrip filter thereof.
The technical solution adopted for the present invention to solve the technical problems is: a kind of microstrip filter of structure, including
At least two unit,
Each unit all includes the second microstrip line, the 3rd microstrip line, the first electric capacity, wherein the second microstrip line tool
The first end and the second end, one end of described first electric capacity is had to be connected to the second end of described second microstrip line, separately
One termination is with reference to ground；Second end of one described second microstrip line of termination of described 3rd microstrip line, the other end is opened
Road or connect with reference to ground；And
Being connected by the first microstrip line symmetry between adjacent two unit, described symmetry is connected as: adjacent two
First end of the second microstrip line of unit is connected by described first microstrip line, or the of adjacent two unit
Second end of two microstrip lines is connected by described first microstrip line.
In microstrip filter of the present invention, each unit the most also includes the second electric capacity, described second electricity
First end of the first described second microstrip line of termination held, the second termination of described second electric capacity is with reference to ground.
In microstrip filter of the present invention, each unit the most also includes the 3rd electric capacity, described 3rd electricity
Hold the two ends being connected in parallel on described second microstrip line.
In microstrip filter of the present invention, each unit the most also includes the second electric capacity and the 3rd electric capacity,
And, the first end of the first described second microstrip line of termination of described second electric capacity, the of described second electric capacity
Two terminations are with reference to ground, and described 3rd electric capacity is connected in parallel on the two ends of described second microstrip line.
In microstrip filter of the present invention, the width of described 3rd microstrip line is less than described first micro-strip
Line and the width of described second microstrip line.
The present invention also constructs a kind of power apparatus, the load including pcb board and being arranged on pcb board, filtering
Device, described wave filter is above-mentioned microstrip filter.
In power apparatus of the present invention, described pcb board is multi-layer PCB board, and, described first
Microstrip line and described second microstrip line are arranged on the ground floor of described multi-layer PCB board, and described 3rd microstrip line sets
Put the second layer at described multi-layer PCB board.
In power apparatus of the present invention, described 3rd microstrip line S-shaped or dish on described pcb board
Fragrant shape arrangement.
In power apparatus of the present invention, the impedance of described first microstrip line and described second microstrip line divides
The other impedance matching with described load.
Implementing the microstrip filter of the present invention, this microstrip filter includes at least two unit, wherein, each
Unit all includes the second microstrip line, the 3rd microstrip line, the first electric capacity, and wherein, the second microstrip line has first
End and the second end, one end of the first electric capacity is connected to the second end of the second microstrip line, and another termination is with reference to ground；
Second end of one described second microstrip line of termination of the 3rd microstrip line, the other end is opened a way or connects with reference to ground；Adjacent
Connected by the first microstrip line symmetry between two unit.And, in this microstrip filter, the 3rd micro-strip
Line affects the low-limit frequency of this microstrip filter passband, and within the specific limits, the 3rd microstrip line length is the longest,
Impedance is the highest, and the low-limit frequency of this microstrip filter passband is the lowest.First microstrip line affects the filter of this micro-strip
The maximum bandwidth of ripple device passband, within the specific limits, the first microstrip line is the longest, this microstrip filter passband
Maximum bandwidth is the narrowest.The highest frequency of this microstrip filter passband of the first capacitive effect, the first electric capacity is the biggest,
This microstrip filter allows the highest frequency passed through the least.Due to this microstrip filter only by microstrip line and electricity
Hold and constitute, compared to existing technology in LC wave filter, microstrip line machining accuracy is high, there is not welding, shape
The impact become, the uniformity of product is high.It is additionally, since and eliminates relatively costly inductance, correspondingly reduce
Cost.Simultaneously as do not have higher device, space requirement is little, shielding cavity and the design of product structure
Simply, be conducive to improving the quality of product.Microstrip filter in compared to existing technology, owing to adding electricity
Hold, the length of microstrip line can be reduced, thus save the area taking pcb board.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the circuit diagram of a kind of wave filter of prior art；
Fig. 2 is the circuit diagram of the another kind of wave filter of prior art；
Fig. 3 is the circuit diagram of microstrip filter embodiment one of the present invention；
Fig. 4 is the circuit diagram of microstrip filter embodiment two of the present invention；
Fig. 5 is the partial schematic diagram of power apparatus embodiment one of the present invention.
Detailed description of the invention
Fig. 3 is the circuit diagram of microstrip filter embodiment one of the present invention, and this microstrip filter includes adjacent two
Individual unit 10,20, and, connected by the first microstrip line L2 symmetry between these two unit 10,20.
Wherein, unit 10 includes the second microstrip line L1, the 3rd microstrip line L4, the first electric capacity C3, and, the
Two microstrip line L1 have the first end and the second end, and the first electric capacity C3 is connected to the second of the second microstrip line L1
Between end and reference ground, second end of a termination second microstrip line L1 of the 3rd microstrip line L4, the other end is opened
Road.Correspondingly, unit 20 includes the second microstrip line L3, the 3rd microstrip line L5, the first electric capacity C4, and
And, the second microstrip line L3 has the first end and the second end, and the first electric capacity C4 is connected to the second microstrip line L3
The second end and with reference between ground, second end of the first termination second microstrip line L3 of the 3rd microstrip line L5,
The other end is opened a way.And, it is connected as by the first microstrip line L2 symmetry between unit 10 and unit 20:
Second end of the second microstrip line L1 of unit 10 is connected with second end of the second microstrip line L3 of unit 20.
In the microstrip filter of this embodiment, the 3rd microstrip line L4, L5 affects the lowest frequency of this filter passband
Rate, within the specific limits, the 3rd microstrip line L4, L5 length is the longest, and impedance is the highest, and low-limit frequency is the most just
The lowest.First microstrip line L2 affects the maximum bandwidth of this filter passband, and within the specific limits, first is micro-
Line L2 is the longest for band, and bandwidth is the narrowest.First electric capacity C3, C4 affects the highest frequency of this filter passband, the
One electric capacity C3, C4 is the biggest, it is allowed to the highest frequency passed through is the least.
In the above-described embodiments, microstrip filter is made up of microstrip line and electric capacity, compared to existing technology in
LC wave filter, microstrip line machining accuracy is high, there is not the impact of welding, deformation, and the uniformity of product is high.
It is additionally, since and eliminates relatively costly inductance, correspondingly reduce cost.Simultaneously as there is no higher device
Part exists, and space requirement is little, and the design of shielding cavity and product structure is simple, is conducive to improving the quality of product.
Microstrip filter in compared to existing technology, owing to adding electric capacity, can reduce the length of microstrip line, thus
Save the area taking pcb board.
Finally it should be noted that, although figure only illustrates two unit, it should be appreciated that at other of the present invention
In embodiment, the quantity of unit also can be more than two, as long as ensureing that adjacent two unit symmetry connects, i.e.
First end of the second microstrip line of adjacent two unit is connected by described first microstrip line, or adjacent two
Second end of the second microstrip line of unit is connected by described first microstrip line..It addition, the most adjacent two lists
The parameter of the first microstrip line connected between unit is identical, and the parameter of the corresponding device in each unit is identical, example
Parameter such as the second microstrip line in each unit is the most identical, and the parameter of the 3rd microstrip line in each unit is equal
Identical, the parameter of the first electric capacity in each unit is the most identical.
Fig. 4 is the circuit diagram of microstrip filter embodiment two of the present invention, and this embodiment compares the reality shown in Fig. 3
Execute example one, have a following difference:
In unit 10,20, the 3rd microstrip line L4, L5 all connects with reference to ground, is so conducive to heat radiation, tool
Body reason is: if do not connect with reference to ground, heat can only be transferred out by dielectric layer, connects and then means with reference to ground
And can be connected with other metal (such as radiator etc.), and the thermal conductivity coefficient of dielectric layer is the least, metal
Thermal conductivity coefficient is very big, and therefore, after ground connection, radiating effect can be better.
Unit 10 also includes the second electric capacity C1, and unit 20 also includes the second electric capacity C6, and, the second electricity
Hold first end of a termination second microstrip line L1 of C1, the second termination reference ground of the second electric capacity C1, the
First end of the one termination second microstrip line L3 of two electric capacity C6, second termination of the second electric capacity C6 is with reference to ground.
In this embodiment, second electric capacity C1, C6 plays regulation input reflection coefficient (i.e. return loss) and band
The effect of outer far-end suppression.
Unit 10 also includes that the 3rd electric capacity C2, unit 20 also include the 3rd electric capacity C5, and, the 3rd electricity
Holding C2 and be connected in parallel on the two ends of the second microstrip line L1, the 3rd electric capacity C5 is connected in parallel on the two ends of the second microstrip line L3.
In this embodiment, the 3rd electric capacity C2 and the second microstrip line L1 and the 3rd electric capacity C5 and the second microstrip line L3
Collectively form bandstop filter, the rejection ability of a certain frequency range can be increased as required, such as, if the 3rd is electric
The resonance point of appearance and the second microstrip line parallel circuit near second harmonic, then increases the suppression to second harmonic
Ability.
In unit 10,20, the width of the 3rd microstrip line L4, L5 is less than the first microstrip line L2 and second
The width of microstrip line L1, L3.So can save taking up room of PCB further, because, the first micro-strip
Line L2 and second microstrip line L1, L3 is main signal path, such as, have the radiofrequency signal of 60W to pass through, and line is too
Thin loss is too big, and the 3rd microstrip line L4, L5 main signal will not be passed through, and has been the effect of filtering, institute
Width with its width comparable the first microstrip line L2 and second microstrip line L1, L3 is smaller.
Fig. 5 is the partial schematic diagram of power apparatus embodiment one of the present invention, and this power apparatus includes that pcb board is (not
Illustrate) and the load (not shown) that is arranged on pcb board and microstrip filter, the electricity of this microstrip filter
Line structure can refer to described previously, and, in this embodiment, the 3rd microstrip line L4, L5 is at pcb board
Upper S-shaped arrangement, so can save the space taking PCB.The most in other embodiments, the 3rd micro-strip
Line L4, L5 also can arrange in incense coil shape or arrange according to other irregular mode, correspondingly, such
Arrangement mode is equally applicable to the first microstrip line L2 and second microstrip line L1, L3.In this embodiment, should
The band connection frequency of wave filter is 400MHz-530MHz, and stopband is 800MHz-4GHz, is used for suppressing power apparatus
The harmonic wave that intermediate power amplifier produces.If the width of the first microstrip line L2 is 80mil, a length of
1250mil, the width of second microstrip line L1, L3 is 80mil, a length of 900mil.3rd microstrip line
The width of L4, L5 is 40mil, a length of 1300mil, and first electric capacity C3, C4 selects 251R15S120JV4S,
Second electric capacity C1, C6 selects 251R15S6R8CV4S, the 3rd electric capacity C2, C5 to select 251R15S7R5CV4S.
The microstrip filter of this embodiment area on pcb board is 16mm*27mm, and 50W power can be allowed to continue
Pass through.It is more than an example of the present invention, in actual applications, the first microstrip line L2, second micro-
Minimum widith with line L1, L3 is determined by power by needs, if power is less, and such as 1W, then
The width of 10mil is sufficient for；If power is bigger, such as 50W, the most at least need 60mil.Second
The length of microstrip line L1, L3 is the smaller the better from taking the long-pending consideration of PCB surface, and its length is the shortest, but not
Must be less than needing to suppress the 1/12 of the lowest wavelength of signal.Ratio is 600MHz if desired for suppression signal frequency,
Dielectric constant is 4.6, then its length must not be less than 900mil.The length of the first microstrip line L2 is then according to need
Depending on the passband width wanted, L2 is the longest, and passband width is the narrowest, and passband input reflection coefficient can be better.
Preferably, if pcb board is multi-layer PCB board, then the 3rd microstrip line L4, L5 can be with the first micro-strip
Line L2, second microstrip line L1, L3 are arranged on the different layers of pcb board.Such as, the first microstrip line L2 and
Second microstrip line L1, L3 is arranged on the ground floor of multi-layer PCB board, and the 3rd microstrip line L4, L5 is arranged on many
The second layer of layer pcb board.First microstrip line L2 and second microstrip line L1, L3 is arranged on ground floor be because of
More capacitor element (such as, the first electric capacity C3, C4, second electric capacity C1, C6 etc.) is had for its connection,
So be easy to the connection of capacitor element and microstrip line, if by the first microstrip line L2 and the second microstrip line L1,
L3 is arranged on the second layer then to be needed by via, and performance can decline.It is additionally, since the resistance of microstrip line
Resist and itself and the distance dependent with reference to ground, and the first microstrip line L2 and second microstrip line L1, L3 is generally
The characteristic impedance of 50ohm, places it in ground floor and (can such as be arranged on the 6th of pcb board the to distance reference
Layer) farther out, live width can be more wider, can allow the power passed through can be some larger.And by the 3rd micro-strip
It is owing to it need not be connected with too many capacitor element that line L4, L5 are arranged on the second layer of multi-layer PCB board,
And, its resistance requirements do not fixed.It addition, the second layer at multi-layer PCB board can ensure the 3rd micro-strip
Line upper and lower surface medium is the same, and phase velocity is consistent, due to the pressing effect of medium, it is not necessary to worry that copper sheet is because being subject to
Heat floats.
Preferably, the impedance of the first microstrip line L2 and second microstrip line L1, L3 respectively with load impedance
Joining, debugging is simple, and the power that the permission of this wave filter can be made to pass through can be some larger.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for ability
For the technical staff in territory, the present invention can have various modifications and variations.All in the spirit and principles in the present invention
Within, any modification, equivalent substitution and improvement etc. made, should be included in the claim model of the present invention
Within enclosing.
Claims (7)
1. a microstrip filter, it is characterised in that include at least two unit, wherein,
Each unit all includes the second microstrip line, the 3rd microstrip line, the first electric capacity, the 3rd electric capacity, wherein
Second microstrip line has the first end and the second end, and one end of described first electric capacity is connected to described second micro-strip
Second end of line, another termination is with reference to ground；One described second microstrip line of termination of described 3rd microstrip line
Second end, the other end is opened a way or connects with reference to ground；Described 3rd electric capacity is connected in parallel on the two of described second microstrip line
End；And
The length of the band connection frequency of this microstrip filter and described 3rd microstrip line and the electricity of described first electric capacity
Capacitance is correlated with；
Being connected by the first microstrip line symmetry between adjacent two unit, described symmetry is connected as: adjacent two
First end of the second microstrip line of individual unit is connected by described first microstrip line, or adjacent two unit
The second microstrip line the second end by described first microstrip line be connected.
Microstrip filter the most according to claim 1, it is characterised in that each unit the most also includes
Second electric capacity, the first end of the first described second microstrip line of termination of described second electric capacity, described second electricity
The second termination held is with reference to ground.
Microstrip filter the most according to claim 1, it is characterised in that described 3rd microstrip line
Width is less than described first microstrip line and the width of described second microstrip line.
4. a power apparatus, the load including pcb board and being arranged on pcb board, wave filter, it is special
Levying and be, described wave filter is the microstrip filter described in any one of claim 1-3.
Power apparatus the most according to claim 4, it is characterised in that described pcb board is multi-layer PCB
Plate, and, described first microstrip line and described second microstrip line are arranged on the first of described multi-layer PCB board
Layer, described 3rd microstrip line is arranged on the second layer of described multi-layer PCB board.
Power apparatus the most according to claim 4, it is characterised in that described 3rd microstrip line is in institute
State S-shaped on pcb board or incense coil shape arrangement.
Power apparatus the most according to claim 4, it is characterised in that described first microstrip line and institute
State the impedance of the second microstrip line respectively with the impedance matching of described load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310603200.1A CN103606724B (en) | 2013-11-25 | 2013-11-25 | A kind of power apparatus and microstrip filter thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310603200.1A CN103606724B (en) | 2013-11-25 | 2013-11-25 | A kind of power apparatus and microstrip filter thereof |
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| CN103606724A CN103606724A (en) | 2014-02-26 |
| CN103606724B true CN103606724B (en) | 2016-09-07 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106712732B (en) * | 2015-11-18 | 2020-04-28 | 华为技术有限公司 | Circuit for reducing memory effect of power amplifier, power amplifier output circuit and power amplifier |
| CN106209008B (en) * | 2016-06-30 | 2019-02-26 | 深圳市九洲电器有限公司 | A kind of filter and electronic equipment |
| CN108377138A (en) * | 2018-01-10 | 2018-08-07 | 海能达通信股份有限公司 | A kind of bandpass filter and receiver |
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| CN102187572A (en) * | 2008-10-17 | 2011-09-14 | 株式会社村田制作所 | Lc filter and high-frequency switch module |
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| CN102255606A (en) * | 2011-07-25 | 2011-11-23 | 中国科学院微电子研究所 | Solid-state radio frequency power supply based on E-type power amplifying circuit |
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