CN104269592B - A kind of small cavity filter, multiplexer and combiner - Google Patents
A kind of small cavity filter, multiplexer and combiner Download PDFInfo
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- CN104269592B CN104269592B CN201410549432.8A CN201410549432A CN104269592B CN 104269592 B CN104269592 B CN 104269592B CN 201410549432 A CN201410549432 A CN 201410549432A CN 104269592 B CN104269592 B CN 104269592B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/04—Coaxial resonators
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Abstract
The invention discloses a kind of small cavity filter, multiplexer and combiner, wherein small cavity filter includes resonant rod and the accommodating cavity being made up of cavity and cover plate；Cover plate is arranged on the side of cavity；Resonant rod is arranged on the bottom surface of cavity；The open end of resonant rod is provided with the layered structure of lateral openings；The plates structure of intercalated layered body structure is provided with the side wall of accommodating cavity；A gap is provided between layered structure and plates structure.The plates structure of the intercalated layered body structure set on the side wall of the layered structure and accommodating cavity with lateral openings is set due to resonant rod open end, make layered structure with the facing area between plates structure with resonant rod upper annular body of the prior art compared with the total facing area corresponding to cover plate upper annular body, facing area of the invention is at least the twice of the facing area of prior art.
Description
Technical field
The present invention relates to field of microwave communication, and in particular to a kind of small cavity filter, multiplexer and combiner.
Background technology
At present, with the fast development of microwave communication techniques, high integration and miniaturization are sent out as field of microwave communication
The trend of exhibition.As the transceiving filter of radio frequency communication devices front end, size and the weight directly height influence communication of its volume
The degree of miniaturization of equipment.
According to resonator frequency formula：Understand, when needing to reduce resonant frequency f, that is, need
Induction reactance L or capacitive reactance C increases.Again by capacitance equation：C=(ε * S)/(4 π * k*d) understands, when electric capacity distance between plates d is fixed, holds
Anti- C increases with the increase of facing area S between capacitor board.
Fig. 1 is a kind of cavity body filter (referring to ZL201320265200.0) of mode of prior art, and it includes cavity
2nd, cover plate 4, resonant rod 1, tuning screw 3, the nut 5 for fixing tuning screw 3 and the screw 6 for fixing resonant rod 1, humorous
Shake bar 1 and cover plate 4 on be provided with ring bodies 41 for increasing loading capacitance.
In order that wave filter reach us needed for relatively low resonant frequency, at present we generally using increase wave filter it is humorous
Shake bar 1 height or increase resonant rod 1 the diameter of ring bodies 41 method so that induction reactance L or capacitive reactance C increase so reduce filter
The resonant frequency of ripple device.When the resonant frequency for needing is lower, resonant rod also bigger, the ring bodies 41 on the top of resonant rod 1 of height
Diameter is also bigger, and cavity body filter volume, weight also become big therewith, and this will be unfavorable for the miniaturization of cavity body filter and integrated
Change.
The content of the invention
In order to solve to obtain higher capacity, lower frequency cavity body filter volume will to be caused to increase in the prior art
Problem, a kind of open end in resonant rod is provided with the layered structure of lateral openings and the side of accommodating cavity
The small cavity filter of the plates structure of intercalated layered body structure is provided with wall.
In order to reach foregoing invention purpose, the present invention is adopted the following technical scheme that：
A kind of first aspect, there is provided small cavity filter, including resonant rod and the appearance that is formed by cavity and cover plate
Put chamber；Cover plate is arranged on the side of cavity；Resonant rod is arranged on the bottom surface of cavity；The open end of resonant rod is provided with laterally to be opened
The layered structure of mouth；The plates structure of intercalated layered body structure is provided with the side wall of accommodating cavity；Layered structure and piece
A gap is provided between shape body structure.
In the first possible implementation, the small cavity filter can also include tuning screw；Cavity
Through hole is offered in roof, layered structure and plates structure；A storage tank is provided with the body of rod of resonant rod；Tuning spiral shell
One end of bar is placed in storage tank through the through hole in cavity roof, layered structure and plates structure.
With reference to the first possible implementation, in second possible implementation, tuning screw and cavity, stratiform
A gap is provided between body structure and plates structure.
With reference to the first and second possible implementation, in the third possible implementation, layered structure
At least include two-layer lamina, and layered structure the lamina number of plies than the sheet excrescence of plates structure the number of plies more than one
Layer.
A kind of second aspect, there is provided multiplexer, at least including small cavity filter, small cavity filter bag
Include resonant rod and the accommodating cavity formed by cavity and cover plate；Cover plate is arranged on the side of cavity；Resonant rod is arranged on the bottom of cavity
On face；The open end of resonant rod is provided with the layered structure of lateral openings；Intercalated layered body is provided with the side wall of accommodating cavity
The plates structure of structure；A gap is provided between layered structure and plates structure.
A kind of third aspect, there is provided combiner, at least including small cavity filter, small cavity filter bag
Include resonant rod and the accommodating cavity formed by cavity and cover plate；Cover plate is arranged on the side of cavity；Resonant rod is arranged on the bottom of cavity
On face；The open end of resonant rod is provided with the layered structure of lateral openings；Intercalated layered body is provided with the side wall of accommodating cavity
The plates structure of structure；A gap is provided between layered structure and plates structure.
Beneficial effects of the present invention are：Because resonant rod open end sets the layered structure with lateral openings and houses
The plates structure of the intercalated layered body structure set on the side wall in chamber, it is just right between layered structure and plates structure to make
Area with resonant rod upper annular body of the prior art compared with the total facing area corresponding to cover plate upper annular body, it is of the invention
Facing area is at least the twice of the facing area of prior art.
The number of plies of laminate body structure of the present invention and plates structure often increases by one layer, its increased loading capacitance it is just right
Area is further added by 2 times relative to total facing area of the prior art to I haven't seen you for ages.
After forming loading capacitance due to layered structure and plates structure, what is filled between its plate is air, and loss is small, therefore
The present invention also has higher q values, preferable temperature stability.
Compared with prior art, this small cavity filter is obtained in that in the case where that need not increase volume and weight
Lower resonant frequency, it has not only saved material, alleviates weight, reduces production cost, also helps the small of wave filter
Type and integrated.
Brief description of the drawings
Technical scheme in order to illustrate more clearly the embodiments of the present invention, below will be to that will use needed for embodiment description
Accompanying drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for this
For the those of ordinary skill of field, on the premise of not paying creative work, can also obtain other according to these accompanying drawings
Accompanying drawing.
Fig. 1 is the structural representation of small cavity filter of the prior art；
Fig. 2 is the structural representation of small cavity filter one embodiment of the present invention；
Fig. 3 is the structural representation of small cavity filter one embodiment of the present invention；
Fig. 4 is the structural representation that the present invention has the small cavity filter of lamina twice.
Wherein, 1, resonant rod；11st, layered structure；12nd, storage tank；2nd, cavity；3rd, tuning screw；4th, cover plate；41st, ring
Shape body；5th, nut；6th, screw；7th, accommodating cavity；71st, side wall；72nd, plates structure.
Specific embodiment
Specific embodiment of the invention is described below, this hair is understood in order to those skilled in the art
It is bright, it should be apparent that the invention is not restricted to the scope of specific embodiment, for those skilled in the art,
As long as in appended claim restriction and the spirit and scope of the present invention for determining, these changes are aobvious and easy to various change
See, all are using the innovation and creation of present inventive concept in the row of protection.
As shown in Figures 2 and 3, the specific embodiment of the cavity body filter for being provided for the present invention, miniaturization cavity filtering
Device includes the cavity 2 of resonant rod 1, cover plate 4 and lateral opening, and resonant rod 1 is arranged on the bottom surface of cavity 2 by screw 6；Cover plate
4 are arranged at the lateral opening of cavity 2.
The open end of resonant rod 1 is provided with the layered structure 11 of lateral openings；Set on the side wall 71 of accommodating cavity 7
There is the plates structure 72 being embedded in inside layered structure 11.One is provided between layered structure 11 and plates structure 72
Gap；Specifically can be not contacted between layered structure 11 and each face of plates structure 72.
The layered structure 11 that resonant rod 1 and its open end are set can be integrally formed, or split shaping after
It is fixed together by way of riveting or welding；The plates structure 72 set on accommodating cavity 7 and its side wall 71 can also be
Be integrally formed, or split shaping after rivet or welding by way of be fixed together.
In one embodiment of the invention, the profile of layered structure 11 and plates structure 72 can for cylinder or
Cuboid；Preferably mode is that the profile of layered structure 11 and plates structure 72 selects cuboid.
Using the cavity body filter of said structure, the facing area between layered structure and plates structure is shown with Fig. 1
The upper annular body 41 of resonant rod of the prior art 1 for going out compared with the total facing area corresponding to the upper annular body 41 of cover plate 4, this hair
Bright facing area is at least the twice of the facing area of prior art, so as to substantially increase facing area S between plate, improves appearance
Anti- C, and then reduce resonant frequency.
In one embodiment of the invention, debug for convenience, a tuning screw 3 can also be set on wave filter
To carry high-frequency degree of regulation；Through hole is offered on roof, layered structure 11 and plates structure 72 in cavity 2；Chamber
Being preferably sized as the through hole on through hole and plates structure 72 on through hole, layered structure 11 on the roof of body 2 is equal
, and the axle center of the through hole of three is preferably located on same straight line.
In one embodiment of the invention, the body of rod of tuning screw 3 can be cylinder or cuboid；For the ease of adjusting
The installation of humorous screw rod 3, the via hole profile in cavity roof, layered structure and plates structure is preferably and tuning screw 3
Body of rod profile matches.
A storage tank 12 is provided with the body of rod of resonant rod 1；One end of tuning screw 3 passes through the roof of cavity 2, stratiform
Through hole in body structure 11 and plates structure 72 is placed in storage tank 12；The upper end of tuning screw 3 is fixed on by nut 5
On the top surface of cavity 2.Resonant frequency is adjusted by adjusting the length in the precession storage tank 12 of tuning screw 3.Wherein, tune
A gap is preferably provided between screw rod 3 and layered structure 11 and plates structure 72；Specifically can be, humorous screw rod 1 with
Without any contact relation between layered structure 11 and plates structure 72.
The bottom surface of storage tank 12 can be infinitely close to the screw 6 of fixed resonant rod 1, and the bottom surface of tuning screw 3 is preferably
It is the bottom surface that can be infinitely close to storage tank 12；Storage tank 12 so in resonant rod 1 can be fully utilized to realize tuning
Screw rod 3 adjusts the increase of surplus, to reach the purpose of the adjustable range for improving filter frequencies.
In one embodiment of the invention, above-mentioned layered structure 11 at least includes two-layer lamina, plates structure
72 at least include a lamellar excrescence；When but using, the number of plies of sheet excrescence will be limited by the number of plies of lamina, i.e.,
The lamina number of plies of layered structure 11 than the sheet excrescence of plates structure 72 the number of plies more than one layer.
Consider from production and processing, the volume of wave filter and quality, preferably following two structures of layered structure 11：
Shown in the layered structure 11 as Fig. 2 and Fig. 3 of the first frame mode, layered structure 11 is by two-layer lamina group
Into plates structure 72 is just only made up of a lamellar excrescence, now, between sheet excrescence gos deep into two-layer lamina composition
Loading capacitance is formed in gap.Facing area between the layered structure 11 and plates structure 72 of the structure with the prior art
The upper annular body 41 of resonant rod 1 compared with the total facing area corresponding to the upper annular body 41 of cover plate 4, at least prior art is being just
To the twice of area.
As shown in Figure 4, layered structure 11 is made up of second layered structure of frame mode 11 three layers of lamina, piece
Shape body structure 72 is just only made up of two lamellar excrescences, now, between sheet excrescence is deeply constituted between lamina two-by-two
Loading capacitance is formed in gap.The number of plies of layered structure 11 and plates structure 72 often increases by one layer, its increased loading capacitance
Facing area at least can also be on the layered structure 11 of the first structure basis relative to total facing area of the prior art
On be further added by 2 times.
In one embodiment of the invention, the plates structure 72 on the side wall 71 of accommodating cavity 7 can be arranged on cavity 2
On any one wall in three side walls, when not excessive wave filter is made up of two or more resonators, house
Plates structure 72 on the side wall 71 in chamber 7 is preferably disposed on the side wall wall of the cavity 2 relative with cover plate 4.Accommodating cavity 7
Side wall 71 on plates structure 72 can also be arranged on inner surface in cover plate 4.
When plates structure 72 is arranged on cavity 2, if will use integrally formed between plates structure 72 and cavity 2
Mode is produced, then can cause that technique is relatively complicated, therefore, in this case, preferably accommodating cavity 7 and its side wall 71
The plates structure 72 of upper setting is fixed together using after split shaping by way of riveting or welding.
The above-mentioned small cavity filter of present invention design can be applied on multiplexer and combiner.
According to resonator frequency formulaAnd capacitance equation C=(ε * S)/(4 π * k*d), wherein ε
Be dielectric constant, S is facing area between plate, k is dielectric constant, d be plate clearance from；Induction reactance L and distance between plates d are fixed,
Facing area S between increase plate, so as to increase loading capacitance, improves capacitive reactance C, and then reduce resonant frequency.
The wave filter shown in Fig. 1 equal-sized to volume enters with the height of the resonant frequency of wave filter of the invention below
Row analysis：
Embodiment one
The embodiment is made up of two-layer lamina with layered structure 11, and plates structure 72 is just only dashed forward by a lamellar
The structure for going out body composition is illustrated to the resonant frequency of wave filter.
The interior chamber size (* * wide long are high) for setting the cavity 2 in Fig. 2 and Fig. 3 is 8mm*8mm*6mm；The totality of resonant rod 1
5.7mm is highly set to, the wherein lamina of resonant rod 1 is set to 0.5mm per thickness degree, and length is set to 7.2mm, wide to be set to
7mm, the interlayer spacing between lamina is 1.1mm；Sheet protrudes body thickness and is set to 0.5mm, and length is set to 7.2mm, wide to set
7mm is set to, the lower surface of sheet excrescence is set to 4.4mm, sheet excrescence and resonant rod 1 apart from the inner bottom surface of cavity 2
Lamina distance is set to 0.3mm；Through-hole diameter in cavity roof, layered structure 11 and plates structure 72 is
According to resonator frequency formulaAnd capacitance equation C=(ε * S)/(4 π * k*d)：
With reference to above-mentioned formula and the relative dimensions of above-mentioned wave filter, resonant frequency of the invention can be known at least
Can reach 2.4GHz；In the case of the interior chamber size identical of prior art cavity, Fig. 1 is shown in the prior art come
In 3.23GHz, resonant frequency of the invention is decreased by the lowest resonant frequency of wave filter relative to prior art
Embodiment two
The embodiment is made up of three layers of lamina with layered structure, and plates structure is just by two lamellar excrescence groups
Into structure the resonant frequency of wave filter is illustrated.
The interior chamber size (* * wide long are high) for setting the cavity 2 in Fig. 4 is 8mm*8mm*6mm；The overall height of resonant rod 1 sets
5.7mm is set to, the wherein lamina of resonant rod 3 is set to 0.5mm per thickness degree, and length is set to 7.3mm, wide to be set to 6.5mm,
Interlayer spacing is 1.1mm between lamina；Sheet protrudes body thickness and is set to 0.5mm, and length is set to 7.3mm, wide to be set to
6.5mm, the interlayer spacing between sheet excrescence is 1.1mm, and the ground floor lower surface of sheet excrescence is apart from the interior bottom of cavity
Face is 3.1mm, and the second layer lower surface of sheet excrescence is 4.5mm, sheet excrescence and resonant rod apart from the inner bottom surface of cavity 1
1 lamina distance is set to 0.3mm, the through-hole diameter in cavity roof, layered structure 11 and plates structure 72
For
According to resonator frequency formulaAnd capacitance equation C=(ε * S)/(4 π * k*d)：
With reference to above-mentioned formula and the relative dimensions of above-mentioned wave filter, resonant frequency of the invention at least can reach 1.96GHz；
In the case of the interior chamber size identical of prior art cavity, Fig. 1 shows the lowest resonance of the wave filter in the prior art come frequently
In 3.23GHz, resonant frequency of the invention is decreased by rate relative to prior art
From above-described embodiment one, two, in specific application, beneficial effects of the present invention are with setting on cover plate
The number of plies of the lamina set on sheet excrescence and resonant rod increases and further improves.
To sum up, the invention is characterized in that such scheme, makes a kind of cavity body filter, duplexer or combiner without increasing
Can be operated in lower resonant frequency in the case of volume and weight, not only save material, alleviate weight, reduced
Production cost, also helps the miniaturization of wave filter and integrated.
Although being described in detail to specific embodiment of the invention with reference to accompanying drawing, should not be construed as special to this
The restriction of the protection domain of profit.In the scope described by claims, those skilled in the art are without creative work
The various modification and variation that can be made still belong to the protection domain of this patent.
Claims (8)
1. a kind of small cavity filter, including resonant rod and the accommodating cavity being made up of cavity and cover plate；The resonant rod peace
On the bottom surface of the cavity；It is characterized in that：The cover plate is arranged on the side of the cavity；The open circuit of the resonant rod
End is provided with the layered structure of lateral openings；The sheet of the layered body structure of insertion is provided with the side wall of the accommodating cavity
Body structure；A gap is provided between layered body structure and the plates structure；Layered body structure at least includes
Two-layer lamina, and one more than the number of plies of the sheet excrescence of the lamina number of plies than the plates structure of layered body structure
Layer；
Small cavity filter also includes tuning screw；The roof of the cavity, layered body structure and the plates
Through hole is offered in structure；A storage tank is provided with the body of rod of the resonant rod, the bottom surface of the storage tank is adjacent to
Screw on resonant rod；One end of the tuning screw passes through the cavity roof, layered body structure and the plates
Through hole in structure is placed in the storage tank.
2. small cavity filter according to claim 1, it is characterised in that：The tuning screw and layered body
A gap is provided between structure and the plates structure.
3. small cavity filter according to claim 1, it is characterised in that：The plates structure setting is described
On the side wall of cavity.
4. small cavity filter according to claim 1, it is characterised in that：The plates structure setting is described
The inner surface of cover plate.
5. according to any described small cavity filters of claim 1-4, it is characterised in that：Layered body structure and institute
Plates structure is stated for cylinder or cuboid.
6. small cavity filter according to claim 1 and 2, it is characterised in that：The body of rod of the tuning screw is
Cylinder or cuboid；Via hole profile in the cavity roof, layered body structure and the plates structure with it is described
The body of rod profile of tuning screw matches.
7. a kind of multiplexer, it is characterised in that：Including any described small cavity filters of claim 1-6.
8. a kind of combiner, it is characterised in that：Including any described small cavity filters of claim 1-6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410549432.8A CN104269592B (en) | 2014-10-16 | 2014-10-16 | A kind of small cavity filter, multiplexer and combiner |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410549432.8A CN104269592B (en) | 2014-10-16 | 2014-10-16 | A kind of small cavity filter, multiplexer and combiner |
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| CN104269592A CN104269592A (en) | 2015-01-07 |
| CN104269592B true CN104269592B (en) | 2017-07-04 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206236769U (en) | 2016-10-25 | 2017-06-09 | 华为技术有限公司 | A kind of combiner and antenna assembly |
| IT202100012983A1 (en) * | 2021-05-19 | 2022-11-19 | Commscope Italy Srl | FIXING ELEMENT FOR THE RESONATOR OF A RADIOFREQUENCY FILTER |
| CN116404391B (en) * | 2023-06-09 | 2023-08-29 | 京信射频技术(广州)有限公司 | Resonator, filter and manufacturing method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202050041U (en) * | 2010-10-29 | 2011-11-23 | 昆山锦泰电子器材有限公司 | Filter |
| CN204167450U (en) * | 2014-10-16 | 2015-02-18 | 成都联帮微波通信工程有限公司 | A kind of small cavity filter, multiplexer and mixer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6247495B2 (en) * | 2012-11-26 | 2017-12-13 | キヤノン株式会社 | Semiconductor device and manufacturing method thereof |
| CN203180029U (en) * | 2013-03-20 | 2013-09-04 | 深圳市大富科技股份有限公司 | Cavity filter and radio frequency communication device |
| CN103280617B (en) * | 2013-05-15 | 2015-04-01 | 成都联帮微波通信工程有限公司 | Small cavity filter |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202050041U (en) * | 2010-10-29 | 2011-11-23 | 昆山锦泰电子器材有限公司 | Filter |
| CN204167450U (en) * | 2014-10-16 | 2015-02-18 | 成都联帮微波通信工程有限公司 | A kind of small cavity filter, multiplexer and mixer |
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