CN105280995A - Miniature precise resonant cavity and filter - Google Patents
Miniature precise resonant cavity and filter Download PDFInfo
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- CN105280995A CN105280995A CN201410290044.2A CN201410290044A CN105280995A CN 105280995 A CN105280995 A CN 105280995A CN 201410290044 A CN201410290044 A CN 201410290044A CN 105280995 A CN105280995 A CN 105280995A
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- resonant cavity
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Abstract
The invention provides a miniature precise resonant cavity and a filter in the microwave field. The height, length and width of the resonant cavity are 30-45 mm; the height of an outer guiding post in the cavity is 20-44 mm, the outer diameter thereof is 5-38 mm and the inner diameter thereof is 3-36 mm; the outer wall of the top end of the outer guiding post is provided with a circular ring, of which the inner diameter is 5-38 mm, the outer diameter is 6-44 mm and the height is 1-5 mm; and the diameter of an inner guiding post in the outer guiding post is 2-35 mm. The filter of the miniature precise resonant cavity has the advantages of small size, low in-band insertion loss, high out-of-band rejection and high Q value.
Description
Technical field
The present invention relates to frequency microwave technical field, particularly relate to a kind of small-sized accurate resonant cavity and filter.
Background technology
The develop rapidly of short-wave communication tedhnology and continuous maturation make filtering clutter particularly important.
Popularize today of development at mobile communications network, various microwave mobile communication network used band scope is close, mutually easily causes interference.It is vital that the microwave filter of high-quality runs guarantee wireless communication networks health.
Summary of the invention
The invention provides a kind of small-sized accurate resonant cavity and filter, use the small-sized accurate resonant cavity of this resonant cavity and filter to have the advantage that in band, Insertion Loss is low, Out-of-band rejection is high, Q value is high.
Wherein in a kind of embodiment, described a kind of resonant cavity for small-sized accurate resonant cavity and filter, the height of described resonant cavity, length and width are 30-45 millimeter, the height of the outer guiding post in cavity is 20-44 millimeter, external diameter is 5-38 millimeter, internal diameter is 3-36 millimeter, outer guiding post top outer wall has that an internal diameter is 5-38 millimeter, external diameter is 6-44 millimeter, the annulus of high 1-5 millimeter, and the diameter being located at the inner guiding post in outer guiding post is 2-35 millimeter.
Wherein in an embodiment, the degree of depth that described inner guiding post stretches into outer guiding post is adjustable.
Wherein in an embodiment, the cavity of described outer guiding post and described resonant cavity is formed in one structure, and the outer wall of described outer guiding post can have annulus, also can not have annulus, also can common combination be used in filter.
Wherein in an embodiment, described inner guiding post is bolt, and the mode that inner guiding post is threaded connection is fixing on the cover board.
A kind of small-sized accurate resonant cavity and filter, comprise multiple resonant cavity, the height of described resonant cavity, length and width are 30-45 millimeter, the height of the outer guiding post in cavity is 20-44 millimeter, external diameter is 5-38 millimeter, internal diameter is 3-36 millimeter, outer guiding post top outer wall has that an internal diameter is 5-38 millimeter, external diameter is 6-44 millimeter, the annulus of high 1-5 millimeter, and the diameter being located at the inner guiding post in outer guiding post is 2-35 millimeter.
Wherein in an embodiment, described passage comprises eight resonant cavitys, be respectively the first resonant cavity, second resonant cavity, 3rd resonant cavity, 4th resonant cavity, 5th resonant cavity, 6th resonant cavity, 7th resonant cavity, 8th resonant cavity, described first resonant cavity, second resonant cavity, 3rd resonant cavity, 4th resonant cavity, 5th resonant cavity, 6th resonant cavity, 7th resonant cavity, 8th resonant cavity is connected by window successively and is arranged into the array of 2*4, described first resonant cavity is directly connected by window with the 4th resonant cavity, described 5th resonant cavity is directly communicated with by window with the 8th resonant cavity.
Wherein in an embodiment, described resonant cavity, cover plate, outer guiding post and inner guiding post are made up of the different metal materials such as aluminium, copper, titanium, steel, iron and alloy.
Wherein in an embodiment, the surface attachment of described resonant cavity, inner guiding post, outer guiding post and cover plate has or is all attached with silver-colored or the golden or silver-colored billon of copper of copper or Graphene.
Wherein in an embodiment, described small-sized accurate resonant cavity and filter also comprise the adjusting rod of intersection's generation transmission zero of at least two resonant cavitys being located at passage.
Wherein in an embodiment, described adjusting rod shape is U-shaped.
Above-mentioned resonant cavity and small-sized accurate resonant cavity and filter design according to electromagnetic transmission theory, can be found out use the small-sized accurate resonant cavity of this resonant cavity and filter to have the advantage that in band, Insertion Loss is low, Out-of-band rejection is high, Q value is high by Electromagnetic Simulation and actual test result.
Accompanying drawing explanation
Fig. 1 is small-sized accurate resonant cavity and the filter schematic of an embodiment;
One of them cavity resonator structure schematic diagram that Fig. 2 is accurate resonant cavity small-sized shown in Fig. 1 and filter;
Fig. 3 for accurate resonant cavity small-sized shown in Fig. 1 and filter signal by time test result schematic diagram.
Embodiment
Please refer to Fig. 1 and Fig. 2, an embodiment provides a kind of filter 100.This filter 100 comprises eight resonant cavitys.Signal transmissions cavity 110 is connected with external microwave circuit by connector 120, is used for transmitting and trap signal.
Eight resonant cavitys of passage are respectively the first resonant cavity 131, second resonant cavity 132, the 3rd resonant cavity 133, the 4th resonant cavity 134, the 5th resonant cavity 135, the 6th resonant cavity 136, the 7th resonant cavity 137, the 8th resonant cavity 138.First resonant cavity 131, second resonant cavity 132, the 3rd resonant cavity 133, the 4th resonant cavity 134, the 5th resonant cavity 135, the 6th resonant cavity 136, the 7th resonant cavity 137, the 8th resonant cavity 138 are connected by the window in metallic walls successively and are arranged into the array of 2*4.First resonant cavity 131 is directly connected with the 4th resonant cavity 134, and the 5th resonant cavity 135 is directly connected with the 8th resonant cavity 138.Their common wall has offered the groove of connection effect, the width of its middle slot is determined by the stiffness of coupling between resonant cavity, and stiffness of coupling is stronger, then the width of groove is larger.Like this, the cross-couplings between the first resonant cavity 131 and the 4th resonant cavity 134 will be better.In like manner, the cross-couplings between the 5th resonant cavity 135 and the 8th resonant cavity 138 will be better.Stiffness of coupling in resonant cavity also can go deep into the position adjustments of window by being located at the screw rod of window between cavity.
This filter 100 employs altogether 8 resonant cavitys, and these 8 resonant cavitys form 2*4 matrix layout, create enough transmission zeros, can meet design needs.Because the resonant cavity number that this small-sized accurate resonant cavity and filter use is less and rationally distributed, so the small volume of this small-sized accurate resonant cavity and filter.More transmission zero, also makes this filter 100 achieve high selectivity, can play the effect reducing resonance progression, reduce insertion loss simultaneously.Certainly, the present invention does not limit the particular location of each resonant cavity, and those skilled in the art person suitably can adjust the position of resonant cavity, and it is still within protection scope of the present invention.
Be provided with outer guiding post 170 in the cavity of the resonant cavity of transmission channel and receive path, be provided with inner guiding post 180 in outer guiding post 170, the degree of depth that inner guiding post 180 stretches into outer guiding post 170 is adjustable.Inner guiding post 180 is herein bolt, and the mode that inner guiding post 180 is threaded connection is fixed on cover plate 190.That is, cover plate 190 is provided with screwed hole, inner guiding post 180 has the screw thread closed with the corresponding threaded holes on cover plate, and the mode that such inner guiding post 180 just can be threaded connection is fixing on the cover board.Meanwhile, part extend in outer guiding post 170 by inner guiding post 180.By the performance regulating inner guiding post 180 degree of depth stretched in outer guiding post 170 can adjust this filter 100, the needs used with satisfied reality.
The height of the cavity of the resonant cavity of transmission channel and receive path, length and width are 30-45 millimeter, the height of the outer guiding post in cavity is 20-44 millimeter, external diameter is 5-38 millimeter, internal diameter is 3-36 millimeter, outer guiding post top outer wall has that an internal diameter is 5-38 millimeter, external diameter is 6-44 millimeter, the annulus of high 1-5 millimeter, the diameter being located at the inner guiding post in outer guiding post is 2-35 millimeter, and the diameter of inner guiding post 180 is 6 millimeters herein.The size of outer guiding post 170 is less, thus make the volume of resonant cavity not need to do comparatively large, thus while meeting performance requirement, reduce the volume of this filter 100 further.
In this embodiment, outer guiding post 170 and the cavity of resonant cavity are formed in one structure, in other embodiments, by modes such as screws, outer guiding post 170 are fixed on the bottom of resonant cavity.Resonant cavity, cover plate 190, outer guiding post 170, inner guiding post 180 are made by the different metal materials such as metallic aluminium, copper, titanium, steel, iron and alloy.The outer surface of resonant cavity, inner guiding post 180, outer guiding post 170 and cover plate is attached with or is all attached with copper or silver or Kufil or Graphene.The Q value of this filter 100 can be improved like this, reduce pass band insertion loss, strengthen Out-of-band rejection.
In this embodiment, the annulus of outer guiding post 170 top outer wall can reduce the resonance frequency of single cavity greatly, and the length of such inner guiding post reduces to some extent, thus saves processing cost.
This filter 100 also comprises the adjusting rod of intersection's generation transmission zero of at least two resonant cavitys being located at passage.These adjusting rods are U-shaped adjusting rods 151 and 152.Particularly, the intersection of the first resonant cavity 131, second resonant cavity 132, the 3rd resonant cavity 133, the 4th resonant cavity 134 is provided with U-shaped adjusting rod 151, connect the first resonant cavity 131 and the 3rd resonant cavity 133, but U-shaped adjusting rod 151 does not contact the outer guiding post of the first resonant cavity 131 and the 3rd resonant cavity 133.The intersection of the 5th resonant cavity 135, the 6th resonant cavity 136, the 7th resonant cavity 137, the 8th resonant cavity 138 is also provided with U-shaped adjusting rod 152, connect the 5th resonant cavity 135 and the 7th resonant cavity 137, but U-shaped adjusting rod 152 does not contact the outer guiding post of the 5th resonant cavity 135 and the 7th resonant cavity 137.These U-shaped adjusting rods can realize magnetic cross-couplings, produce transmission zero, thus effectively improve the signal suppressing outside the passage band in this filter 100.
Theoretical according to electromagnetic transmission, resonant cavity is along the height H in Electromagnetic Wave Propagation direction and resonance frequency.Relational expression is:
In addition, relational expression:
Give CL, Z0, D, O, L, ε
r, μ
c, f relation.
Wherein CL: conductor losses
Z0: characteristic impedance
D: the internal diameter of outer conductor
O: inner wire diameter
L: conductor length
ε
r: dielectric constant
μ
c: the relative magnetic flux of conductor
F: frequency
The characteristic impedance of coaxial line can be expressed as:
In formula: a is the half of the outer guiding post external diameter in filter
B is the half of cavity length
In addition, the selection principle of b and a meets following condition:
Maximum power capabilities condition: b/a > 1.65
Minimal attenuation condition: b/a < 3.592
According to above principle and according to Electromagnetic Simulation and actual test result, we find that band connection frequency is the housing depth in the ideal resonant chamber of 800-1000MHz, length and width are 30-45 millimeter, the height of the outer guiding post in cavity is 20-44 millimeter, external diameter is 5-38 millimeter, internal diameter is 3-36 millimeter, outer guiding post top outer wall has that an internal diameter is 5-38 millimeter, external diameter is 6-44 millimeter, the annulus of high 1-5 millimeter, and the diameter being located at the inner guiding post in outer guiding post is 2-35 millimeter.
Please refer to Fig. 3.This small-sized accurate resonant cavity and filter 100 are mainly applicable to the application that band connection frequency is 800-900MHz.This small-sized accurate resonant cavity and filter 100, according to general Chebyshev filters principle design, have in band and wait the features such as ripple, band outer definite transmission zero point is controlled, Out-of-band rejection degree is good.The present invention uses Agilent network analyzer 8753E to test this small-sized accurate resonant cavity and filter 100.As can be seen from test result: in the passband of this small-sized accurate resonant cavity and filter 100, Insertion Loss is within-1.5dB, and Out-of-band rejection is high, within the scope of Peak Jitter 0.5dB, meets instructions for use.Fig. 3 high frequency side steepness is comparatively large, and obviously, it is high that display is Q value in waveform turnover; In passband, waveform is straight, and it is little that display is Peak Jitter; And passband waveform reaches 0.5dB, illustrate that in band, Insertion Loss is low.In stopband, waveform is below-40dB, illustrates that Out-of-band rejection is high.So it is little that this filter 100 has volume, the advantage that in band, Insertion Loss is low, Out-of-band rejection is high, Q value is high.
Transmission channel and the receive path of this small-sized accurate resonant cavity and filter employ altogether 8 resonant cavitys, and these 8 resonant cavitys form approximate 2*4 matrix layout, create enough transmission zeros, can meet design needs.Because the resonant cavity number that this small-sized accurate resonant cavity and filter use is less and rationally distributed, compact conformation, so the small volume of this small-sized accurate resonant cavity and filter, miniaturized needs can be met.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a small-sized accurate resonant cavity, the height of described resonant cavity, length and width are 30-45 millimeter, the height of the outer guiding post in cavity is 20-44 millimeter, external diameter is 5-38 millimeter, internal diameter is 3-36 millimeter, outer guiding post top outer wall has that an internal diameter is 5-38 millimeter, external diameter is 6-44 millimeter, the annulus of high 1-5 millimeter, and the diameter being located at the inner guiding post in outer guiding post is 2-35 millimeter.
2. small-sized accurate resonant cavity according to claim 1, is characterized in that, the degree of depth that described inner guiding post stretches into outer guiding post is adjustable.
3. small-sized accurate resonant cavity according to claim 2, is characterized in that, described inner guiding post is bolt, and the mode that inner guiding post is threaded connection is fixing on the cover board.
4. small-sized accurate resonant cavity according to claim 2, is characterized in that, described outer guiding post top outer wall can have annulus, also can not have annulus, also can common combination be used in filter.
5. a filter, comprise multiple resonant cavity, the height of described resonant cavity, length and width are 30-45 millimeter, the height of the outer guiding post in cavity is 20-44 millimeter, external diameter is 5-38 millimeter, internal diameter is 3-36 millimeter, outer guiding post top outer wall has that an internal diameter is 5-38 millimeter, external diameter is 6-44 millimeter, the annulus of high 1-5 millimeter, and the diameter being located at the inner guiding post in outer guiding post is 2-35 millimeter.
6. filter according to claim 5, it is characterized in that, described filter comprises eight resonant cavitys, be respectively the first resonant cavity, second resonant cavity, 3rd resonant cavity, 4th resonant cavity, 5th resonant cavity, 6th resonant cavity, 7th resonant cavity, 8th resonant cavity, described first resonant cavity, second resonant cavity, 3rd resonant cavity, 4th resonant cavity, 5th resonant cavity, 6th resonant cavity, 7th resonant cavity, 8th resonant cavity is connected by window successively and is arranged into the array of 2*4, described first resonant cavity is directly connected by window with the 4th resonant cavity, described 5th resonant cavity is directly connected by window with the 8th resonant cavity.
7. filter according to claim 6, is characterized in that, described resonant cavity, cover plate, outer guiding post and inner guiding post are made by aluminium, copper, titanium, steel, iron material or alloy.
8. filter according to claim 7, is characterized in that, the surface attachment of described resonant cavity, inner guiding post, outer guiding post and cover plate has or is all attached with copper or silver or Kufil or Graphene.
9. filter according to claim 8, is characterized in that, described filter also comprises the adjusting rod of intersection's generation transmission zero of at least two resonant cavitys being located at passage.
10. filter according to claim 9, is characterized in that, the shape of described adjusting rod is U-shaped.
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| CN201410290044.2A CN105280995A (en) | 2014-06-20 | 2014-06-20 | Miniature precise resonant cavity and filter |
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| CN201410290044.2A CN105280995A (en) | 2014-06-20 | 2014-06-20 | Miniature precise resonant cavity and filter |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004286757A (en) * | 2004-04-26 | 2004-10-14 | Neomax Co Ltd | Sheet cavity resonator for electron spin resonance |
| WO2013050636A1 (en) * | 2011-10-07 | 2013-04-11 | Universidad Politécnica De Valencia | Tunable microwave filter in surface-mounting technology on the basis of coaxial resonant cavities built into the substrate |
| CN203707304U (en) * | 2013-11-08 | 2014-07-09 | 苏州络湾电子科技有限公司 | Accurate coaxial resonant cavity and coaxial filter |
| CN104638340A (en) * | 2013-11-08 | 2015-05-20 | 苏州络湾电子科技有限公司 | Precision coaxial resonant cavity and coaxial filter |
-
2014
- 2014-06-20 CN CN201410290044.2A patent/CN105280995A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004286757A (en) * | 2004-04-26 | 2004-10-14 | Neomax Co Ltd | Sheet cavity resonator for electron spin resonance |
| WO2013050636A1 (en) * | 2011-10-07 | 2013-04-11 | Universidad Politécnica De Valencia | Tunable microwave filter in surface-mounting technology on the basis of coaxial resonant cavities built into the substrate |
| CN203707304U (en) * | 2013-11-08 | 2014-07-09 | 苏州络湾电子科技有限公司 | Accurate coaxial resonant cavity and coaxial filter |
| CN104638340A (en) * | 2013-11-08 | 2015-05-20 | 苏州络湾电子科技有限公司 | Precision coaxial resonant cavity and coaxial filter |
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Application publication date: 20160127 |