CN208753478U - A kind of evaporative pattern waveguide high-pass filter - Google Patents
A kind of evaporative pattern waveguide high-pass filter Download PDFInfo
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- CN208753478U CN208753478U CN201821231553.8U CN201821231553U CN208753478U CN 208753478 U CN208753478 U CN 208753478U CN 201821231553 U CN201821231553 U CN 201821231553U CN 208753478 U CN208753478 U CN 208753478U
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- Prior art keywords
- waveguide
- evaporative pattern
- pass filter
- resonant cavity
- pattern waveguide
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Abstract
The utility model discloses a kind of evaporative pattern waveguide high-pass filters.The evaporative pattern waveguide high-pass filter of the utility model includes evaporative pattern waveguide and two coupled waveguides as input/output port connecting respectively with evaporative pattern waveguide both ends；One is connected at least one coupled waveguide for providing the resonant cavity of out-of-band transmission zero point, the resonance frequency of the resonant cavity is in the stopband range of the evaporative pattern waveguide high-pass filter.Compared with prior art, the utility model is by being arranged simple cavity resonator structure on the input port and/or output port of evaporative pattern waveguide high-pass filter, in the case where not increasing waveguide length, meeting compact-sized requirement, the transmission zero of the high-pass filter is realized with the zero point effect of the resonant cavity, increase Out-of-band rejection, while also reducing the Insertion Loss of the high-pass filter.In addition, technical solutions of the utility model have the advantages of simple structure and easy realization, have a good application prospect.
Description
Technical field
The utility model relates to a kind of waveguide filter more particularly to a kind of evaporative pattern waveguide high-pass filters.
Background technique
High-pass filter is that a kind of frequency response is low cut, the high-end filter by form, is widely applied to
In various communications or radar system.In the higher microwave of frequency or millimeter wave frequency band, the high-pass filter quilt of waveguide form
The electronic system front end for widely applying to low local oscillator, for filtering out the reradiation of local oscillation signal and to image frequency signal
Inhibit.
Common waveguide high-pass filter mainly includes broadband band-pass filter and evaporative pattern high-pass filter both shapes
Formula.If the waveguide bandpass filter of ultra wide band, without zero point, Out-of-band rejection is not good enough；If designed using band zero point,
It is easy in broadband band-pass filter band because higher mode generates resonance, the performance of meeting severe exacerbation system at resonance.In addition
Waveguide broad-band bandpass filter is more demanding to processing dimension, thus cost is also relatively high.Evaporative pattern waveguide high-pass filter
Using one section of lesser rectangular waveguide of broadside (evaporative pattern waveguide), the broadside length of rectangular waveguide, which is less than, needs to inhibit frequency wavelength
1/2, the cutoff frequency of rectangular waveguide is higher than the frequency of being inhibited, and realizes the function of high-pass filter.The high-pass filtering of the form
Device is easier to process, and Insertion Loss very little due to not having window partition wall.But the high-pass filter of this kind of form is outer without band
The order of transmission zero, filter is determined that increasing Out-of-band rejection can only realize by waveguide length is increased, no by the length of waveguide
Conducive to the miniaturization of high-pass filter.
Utility model content
The technical problem to be solved by the utility model is to overcome the shortage of prior art, provide a kind of with transmission zero
Evaporative pattern waveguide high-pass filter, Out-of-band rejection can be increased by transmission zero in the case where not increasing waveguide length.
The utility model specifically uses following technical scheme to solve above-mentioned technical problem:
A kind of evaporative pattern waveguide high-pass filter is connect with evaporative pattern waveguide both ends including evaporative pattern waveguide and respectively
Two coupled waveguides as input/output port；One is connected at least one coupled waveguide for providing out-of-band transmission
The resonant cavity of zero point, the resonance frequency of the resonant cavity is in the stopband range of the evaporative pattern waveguide high-pass filter.
Preferably, the resonant cavity, and the resonance of two resonant cavities are connected separately on described two coupled waveguides
Frequency is different.So as to increase multiple transmission zeros for filter.
Preferably, the resonant cavity is connected to the side of its connected coupled waveguide, and relative to its connected coupled wave
The signal transmission direction led is vertically arranged.Alternatively, the resonant cavity is connected to its connected coupled waveguide and evaporative pattern waveguide phase
On end face even, and the signal transmission direction relative to its connected coupled waveguide is arranged in parallel.
For the ease of adjusting transmission zero location, further, it is provided on the resonant cavity for adjusting its resonance frequency
The tuning part of rate.
Preferably, the tuning part is the tuning screw that can be inserted into the resonant cavity.
It is further preferred that the tuning screw is set to the center of the resonant cavity.
Preferably, the evaporative pattern waveguide high-pass filter is integral forming technique manufacture.
Preferably, it is connected between the evaporative pattern waveguide and coupled waveguide by step-like mating structure.
Preferably, the evaporative pattern waveguide high-pass filter further includes waveguide turning structure.
Compared with prior art, technical solutions of the utility model have the advantages that
The utility model is by adding resonant cavity on the port of evaporative pattern waveguide high-pass filter, and not increasing, waveguide is long
In the case where degree, the transmission zero of the high-pass filter is realized with the zero point effect of the resonant cavity, increases Out-of-band rejection, while
Reduce the Insertion Loss of the high-pass filter.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of first specific embodiment of the utility model evaporative pattern waveguide high-pass filter；In figure
Include: 1, coupled waveguide, 2, coupled waveguide, 3, resonant cavity, 4, mating structure, 5, mating structure, 6, waveguide turning structure, 7, disappear
Lose mould waveguide；
Fig. 2 is the side view of Fig. 1 evaporative pattern waveguide high-pass filter；
Fig. 3 is the equivalent circuit diagram of Fig. 1 evaporative pattern waveguide high-pass filter；
Fig. 4 is the structural perspective of Fig. 1 evaporative pattern waveguide high-pass filter resonance cavity segment；
Fig. 5 is the frequency response characteristic of Fig. 1 evaporative pattern waveguide high-pass filter；
Fig. 6 is the structural schematic diagram of second specific embodiment of the utility model evaporative pattern waveguide high-pass filter；
Fig. 7 is the structural schematic diagram of the utility model evaporative pattern waveguide high-pass filter third specific embodiment.
Specific embodiment
In view of the shortcomings of the prior art, the thinking of the utility model is by the port of evaporative pattern waveguide high-pass filter
Resonant cavity is added, in the case where not increasing waveguide length, the biography of the high-pass filter is realized with the zero point effect of the resonant cavity
Defeated zero point increases Out-of-band rejection, while also reducing the Insertion Loss of the high-pass filter.
Specifically, the evaporative pattern waveguide high-pass filter of the utility model, including evaporative pattern waveguide and respectively with disappear
Lose two coupled waveguides as input/output port of mould waveguide both ends connection；One is connected at least one coupled waveguide
A to be used to provide the resonant cavity of out-of-band transmission zero point, the resonance frequency of the resonant cavity is in the evaporative pattern waveguide high-pass filter
In stopband range.
It as long as a transmission zero usually is arranged for filter, but may be that more than one biography is arranged in filter
Defeated zero point, more effectively to increase Out-of-band rejection ability, for example, be connected separately on described two coupled waveguides one it is described humorous
Shake chamber, and the resonance frequency of two resonant cavities is different, so as to increase multiple transmission zeros for filter.
Multitude of different ways can be used in the setting of resonant cavity, it is preferable that the resonant cavity is connected to its connected coupled wave
The side led, and the signal transmission direction relative to its connected coupled waveguide is vertically arranged.Alternatively, the resonant cavity is connected to
On the end face that its connected coupled waveguide is connected with evaporative pattern waveguide, and the signal transmission side relative to its connected coupled waveguide
To being arranged in parallel.In both schemes, since the latter not will increase the size of filter vertical direction, more compact structure, because
The preferred the latter of this utility model.
The structure of resonant cavity determines its resonance frequency, and conventional resonant cavity comes out once manufacturing and designing, then transmission zero
Position is also just fixed up, in order to can be further arranged on the resonant cavity with flexible modulation transmission zero location
For adjusting the tuning part of its resonance frequency.The tuning part is preferably the tuning screw that can be inserted into the resonant cavity, most
It is set to the center of the resonant cavity well.
For the ease of public understanding, carry out the technical side to the utility model with several specific embodiments and in conjunction with attached drawing below
Case is further elaborated:
Fig. 1 shows the basic structure of one embodiment, and the evaporative pattern waveguide high-pass filter of the present embodiment works in
Ku wave band applies to the front end of Satellite Communication System, for filtering out image signal, reduces the interference of system.As shown in Figure 1, should
Evaporative pattern waveguide high-pass filter include as the coupled waveguide 1 of filter input end mouth and output port, coupled waveguide 2 and
Evaporative pattern waveguide 7 between input, output port, coupled waveguide 1 and coupled waveguide 2 are all the rectangular waveguides of standard
BJ120；4,5 in figure be respectively the mating structure for connecting evaporative pattern waveguide 7 and coupled waveguide 1,2, the matching in the present embodiment
Structure 4,5 is step-like mating structure, to realize the matching between port standard waveguide and filter internal evaporative pattern waveguide,
Realize preferable echoing characteristics；The interface dimensions of the evaporative pattern waveguide 7 of filter internal are smaller, and cutoff frequency, which is higher than, to be needed to press down
The highest frequency of frequency band processed；In order to meet performance indicator requirement, the evaporative pattern waveguide high-pass filter of the present embodiment is provided with wave
Turning structure 6 is led, conventional waveguide turning structure (it is noted that waveguide turning structure and nonessential) is used.Such as Fig. 1
It is shown, the signal transmission direction of one with coupled waveguide 1 are connected on the end face that coupled waveguide 1 is connect with evaporative pattern waveguide 7
Parallel resonant cavity 3, the resonance frequency of resonant cavity 3 is in the stopband range of the evaporative pattern waveguide high-pass filter, specifically
Resonance frequency can be arranged according to actual needs near the frequency to be inhibited.
Fig. 2 is the side view of Fig. 1 evaporative pattern waveguide high-pass filter.
Fig. 3 is the equivalent circuit diagram of Fig. 1 evaporative pattern waveguide high-pass filter, is being passed as shown in figure 3, resonant cavity 3 is equivalent to
A resonator being grounded in parallel on defeated line, by Circuit theory it is found that the frequency signal near resonance frequency is totally reflected, Bu Nengtong
It crosses, and frequency then passes through completely from the farther away information of resonance frequency.
Fig. 4 is the structural perspective of Fig. 1 evaporative pattern waveguide high-pass filter resonance cavity segment, it can be seen that 3 He of resonant cavity
The caliber size of evaporative pattern waveguide 7 is respectively less than the caliber size of coupled waveguide 1, therefore can be integrated in the same of coupled waveguide 1 simultaneously
One end face, it is on the one hand easy to process, on the other hand since its direction is parallel with coupled waveguide 1 (rather than vertical), it is not take up
Additional volume effectively reduces the volume of high-pass filter.
Fig. 5 is the frequency response characteristic of the Ku wave band high-pass filter.The waveguide high-pass filter structural requirement ten
Point compact, entire size requires length to be less than 40mm, is highly less than 18mm.Performance requirement passband 13.75GHz -14.6GHz, band
Outer DC -12.8GHz requires Out-of-band rejection to be greater than 35dB.According to common waveguide high-pass filter, then in so small body
It can not achieve the requirement completely in product.As can be seen from FIG. 5, the evaporative pattern waveguide high-pass filter of the present embodiment can meet completely with
Upper performance requirement, while structure size is also met the requirements.In the high-pass filter structure can by integral forming technique realize by
One piece of metal parts is process, and production easy to process advantageously reduces production cost.
Fig. 6 shows second embodiment of the utility model.As shown in fig. 6, the present embodiment is by two resonant cavities to hang down
Straight direction is connected to the input port and output port of the high-pass filter, and the high pass filter with zero point equally may be implemented
Wave device.If only adding a resonant cavity at a port wherein, or add two resonance frequencies identical humorous two ports
Shake chamber, then can form a zero point；If two can be formed in the resonant cavity that two ports respectively add a resonance frequency different
A transmission zero.The structure and working principle of the present embodiment rest part are identical as a upper embodiment, and details are not described herein again.
However, the parallel direction resonant cavity for the Fig. 1 that compares, using the resonant cavity of vertical direction in the present embodiment, shared volume is bigger, and
Processing is more difficult, therefore preferably with the resonant cavity of parallel direction.
Fig. 7 shows the third embodiment of the utility model.Similar with Fig. 1 structure, the present embodiment is defeated as inputting
The resonant cavity of a parallel direction is provided on one of coupled waveguide of exit port, and in the center of the resonant cavity
The tuning screw being provided in a pluggable resonant cavity, by the resonance frequency of the adjustable resonant cavity of the tuning screw, into
And realize the position of adjustment transmission zero.The tuning screw is equivalent to a loading capacitance, which enters resonant cavity
Deeper, then resonance frequency is lower, and the corresponding transmission zero generated by the resonant cavity is then lower.
In summary, the utility model passes through the input port and/or output port in evaporative pattern waveguide high-pass filter
The upper simple cavity resonator structure of setting, in the case where not increasing waveguide length, meeting compact-sized requirement, with the resonant cavity
Zero point effect realizes the transmission zero of the high-pass filter, increases Out-of-band rejection, while also reducing the Insertion Loss of the high-pass filter.
In addition, technical solutions of the utility model have the advantages of simple structure and easy realization, have a good application prospect.
Claims (10)
1. a kind of evaporative pattern waveguide high-pass filter, connect including evaporative pattern waveguide and respectively with evaporative pattern waveguide both ends two
A coupled waveguide as input/output port；It is characterized in that, being connected with one at least one coupled waveguide for mentioning
For the resonant cavity of out-of-band transmission zero point, the stopband range of the resonance frequency of the resonant cavity in the evaporative pattern waveguide high-pass filter
It is interior.
2. evaporative pattern waveguide high-pass filter as described in claim 1, which is characterized in that connect respectively on described two coupled waveguides
It is connected to the resonant cavity, and the resonance frequency of two resonant cavities is different.
3. evaporative pattern waveguide high-pass filter as described in claim 1, which is characterized in that the resonant cavity is connected to it and is connected
The side of coupled waveguide, and the signal transmission direction relative to its connected coupled waveguide is vertically arranged.
4. evaporative pattern waveguide high-pass filter as described in claim 1, which is characterized in that the resonant cavity is connected to it and is connected
On the end face that coupled waveguide is connected with evaporative pattern waveguide, and the signal transmission direction relative to its connected coupled waveguide is set in parallel
It sets.
5. evaporative pattern waveguide high-pass filter as described in claim 1, which is characterized in that be provided on the resonant cavity for adjusting
Save the tuning part of its resonance frequency.
6. evaporative pattern waveguide high-pass filter as claimed in claim 5, which is characterized in that the tuning part is pluggable described
The tuning screw of resonant cavity.
7. evaporative pattern waveguide high-pass filter as claimed in claim 6, which is characterized in that the tuning screw is set to described humorous
The center of vibration chamber.
8. evaporative pattern waveguide high-pass filter as described in claim 1, which is characterized in that it is integral forming technique manufacture.
9. evaporative pattern waveguide high-pass filter as described in claim 1, which is characterized in that the evaporative pattern waveguide and coupled waveguide
Between connected by step-like mating structure.
10. evaporative pattern waveguide high-pass filter as described in claim 1, which is characterized in that it further includes waveguide turning structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821231553.8U CN208753478U (en) | 2018-08-01 | 2018-08-01 | A kind of evaporative pattern waveguide high-pass filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821231553.8U CN208753478U (en) | 2018-08-01 | 2018-08-01 | A kind of evaporative pattern waveguide high-pass filter |
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| Publication Number | Publication Date |
|---|---|
| CN208753478U true CN208753478U (en) | 2019-04-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821231553.8U Expired - Fee Related CN208753478U (en) | 2018-08-01 | 2018-08-01 | A kind of evaporative pattern waveguide high-pass filter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108847516A (en) * | 2018-08-01 | 2018-11-20 | 江苏贝孚德通讯科技股份有限公司 | A kind of evaporative pattern waveguide high-pass filter |
-
2018
- 2018-08-01 CN CN201821231553.8U patent/CN208753478U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108847516A (en) * | 2018-08-01 | 2018-11-20 | 江苏贝孚德通讯科技股份有限公司 | A kind of evaporative pattern waveguide high-pass filter |
| CN108847516B (en) * | 2018-08-01 | 2024-01-19 | 江苏贝孚德通讯科技股份有限公司 | Lost foam waveguide high-pass filter |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190416 |