CN211352161U - Bridge type absorption resonance structure - Google Patents
Bridge type absorption resonance structure Download PDFInfo
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- CN211352161U CN211352161U CN201921905350.7U CN201921905350U CN211352161U CN 211352161 U CN211352161 U CN 211352161U CN 201921905350 U CN201921905350 U CN 201921905350U CN 211352161 U CN211352161 U CN 211352161U
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Abstract
The utility model discloses a bridge-type absorption resonance structure, which comprises a box body (1), a mounting hole (2), a cover plate (3) and a circuit board (4); the side surface of the box body (1) is fixedly provided with a plurality of symmetrical mounting holes (2), the bottom end inside the box body is provided with a circuit board (4), and the top end of the box body is provided with a cover plate (3); the box body (1) and the cover plate (3) form a sealing structure and both adopt metal cavities; the circuit board (4) is provided with an inductor and a capacitor; the circuit board (4) is formed by LC high-pass and microstrip low-pass mixed cascade connection, and an insulator needle matched with 50 ohms is used as the input and the output of signals; the circuit board (4) adopts a microwave radio frequency plate. The utility model discloses can realize the beneficial effect of super broadband power filtering under the less volume.
Description
Technical Field
The utility model belongs to the technical field of microwave radio frequency filtering, in particular to bridge type absorption resonance structure.
Background
With the increasing requirements of microwave radio frequency transmitting and receiving systems on power indexes, corresponding module devices need to have higher power redundancy, particularly high-power microwave radio frequency filters are key devices in the systems, and the performance indexes of the whole component modules are directly influenced. As far as the power filter is concerned, various schemes of chip miniaturization or miniaturization are certainly not preferable, and people skilled in the art can think of considering the power situation on the basis of mature LC, dielectric or cavity schemes so as to make the best choice according to the actual situation.
Due to the respective applicability of the several schemes, the optimal scheme needs to be made by combining various parameters such as volume, frequency and the like in consideration of the power situation. For example, dielectric filtering is suitable for narrow bands, and the power is not more than 10 watts; LC is suitable for medium power, the maximum power can reach hundreds of watts, and the bandwidth coverage range is wide; the cavity filtering body is high in height value, suitable for high power requirements and capable of reaching kilowatt level, but the corresponding size is large. If the ultra-wideband high-power filtering from several hundred mega to several G needs to be covered, the medium is not suitable for the wideband due to the wide frequency range and the span of more than three octaves, the cavity has a large volume due to the low lower limit frequency, and the LC is difficult to realize due to the large distribution parameters from the upper limit frequency to several G.
According to the characteristics of the prior art, the cavity has high Q value but too large volume; the medium cannot realize broadband; the pure microstrip filtering Q value is too low, so that the power consumption of the product is too large.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to the technical problem who exists among the prior art, provide bridge type absorption resonance structure, can reach the beneficial effect who realizes ultra-wideband power filtering under the less volume.
In order to solve the technical problem, the utility model discloses a technical scheme is: the bridge type absorption resonance structure comprises a box body, a mounting hole, a cover plate and a circuit board;
the side surface of the box body is fixedly provided with a plurality of symmetrical mounting holes, the bottom end of the interior of the box body is provided with a circuit board, and the top end of the box body is provided with a cover plate; the box body and the cover plate form a sealing structure and both adopt metal cavities; the circuit board is provided with an inductor and a capacitor; the circuit board is formed by LC high-pass and microstrip low-pass mixed cascade connection, and an insulator needle matched with ohm is used as the input and the output of signals; the circuit board is made of microwave radio frequency plates.
Compared with the prior art, the utility model discloses the beneficial effect who has is: the utility model discloses the comprehensive consideration volume power requirement adopts LC low-loss topological circuit to combine the structure of distribution microstrip, carries out whole optimal design, realizes ultra-wideband power filtering under the less volume.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic diagram of a circuit structure in the present invention.
In the figure, 1-box body, 2-mounting hole, 3-cover plate and 4-circuit board.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The embodiment of the utility model discloses a bridge-type absorption resonance structure, which comprises a box body 1, a mounting hole 2, a cover plate 3 and a circuit board 4 as shown in the figure;
the side surface of the box body 1 is fixedly provided with a plurality of symmetrical mounting holes 2, the bottom end of the interior of the box body is provided with a circuit board 4, and the top end of the box body is provided with a cover plate 3; the box body 1 and the cover plate 3 form a sealing structure and both adopt metal cavities; the circuit board 4 is provided with an inductor and a capacitor; the circuit board 4 is formed by LC high-pass and microstrip low-pass mixed cascade, and an insulator needle matched with 50 ohms is used as the input and the output of signals; the circuit board 4 is made of microwave radio frequency plate material.
The ultra-wideband filtering characteristic of more than three octaves is solved, and the optimal echo matching is obtained by selecting the optimal principle circuit and the engineering realizability; secondly, the problem of power resistance of a hectowatt element is solved, power node analysis is carried out on the whole filtering circuit, and theoretical support is provided for reasonable selection of internal elements; and finally, optimally designing the whole structural element so as to realize the power filtering of hundreds of watts under the minimum volume. The specific technical characteristics are as follows:
1) circuit features
A typical structure of a general filter circuit is a Top-C or tubular structure, and the filter circuit is formed by mixing and cascading a lumped LC high-pass circuit and a microstrip low-pass circuit, so that the optimal Q value level and the optimal volume are realized.
2) Structural features
Considering with engineering practicality, adopting the insulator needle of 50 ohm matching as the income of signal and going out, confined miniaturized metal cavity is shielding interface for the signal is difficult for the radiation to reveal, and chooses screw fixed mounting for use all around, has guaranteed the good of microwave ground connection performance.
3) Component selection
On the basis of hectowatt-level power filtering, in order to ensure that internal elements are not burnt or even completely failed, the minimum filtering loss obtained on a reasonable and effective Q value is subjected to power analysis of each node of a circuit, the maximum radio frequency current branch and the withstand voltage condition are found out, the transmission power, the reflection power and the device dissipation power are calculated, the required line diameter of an inductive element is calculated, the large withstand voltage level of a capacitive element is selected, and meanwhile, the redundancy design is made.
4) Complete optimization
Because the circuit is simply cascaded and is difficult to obtain the optimal matching reflection, the optimization design of a key parameter target must be integrally carried out, and the target optimization is carried out by adopting the most advanced circuit and layout collaborative design software to obtain the most accurate S parameter curve and the final element value and layout on the premise that the standing wave under the wide pass band is less than 1.3.
The method has the advantages of being clear in application and the prior art, obtaining good effects through actual engineering preparation, enabling tested electrical performance parameters to completely meet requirements, enabling loss in the whole bandwidth to be small, enabling standing waves in a pass band to be well matched, especially completely meeting requirements on filtering power resistance, enabling redundancy design to be carried out according to requirements, and guaranteeing long-term reliability of products prepared by the scheme. The method mainly has the following beneficial effects:
1) high power
The power filtering of 100W level and above is realized, reasonable and proper inductance-capacitance elements are analyzed and selected according to requirements, and a better scheme idea is provided for the power filtering of hundreds of watts in broadband.
2) Broadband widening
The broadband filtering is very difficult to select considering the engineering prototype circuit topology, and the element parameter value difference caused by the requirement of the passband spanning the octave is very large, so the idea solves the problem of small lumped parameter value with high cut-off frequency, reduces the debugging amount and ensures good consistency and repeatability.
3) Miniaturization
In the past, the volume of a common power cavity is at least more than 100mm, even hundreds of mm, in the frequency band, the length of the conventional scheme can be controlled within 60mm, the width of the conventional scheme is 25mm, and the height of the conventional scheme is within 16mm, so that an idea is provided for miniaturization of power filtering.
4) Cost reduction
Generally, the cost of cavity filtering is far higher than that of LC media, and the cost of power cavity is more than two times higher than that of general cavity, so the utility model discloses a power inductance capacitance element that technical scheme selected for use is a lower economic power filtering scheme though the cost is also higher than general LC.
Element selection:
an inductive element adopts a 0.8 wire diameter to prepare an air inductor, so that a higher Q value is obtained;
the capacitive element is a high Q resonant capacitor with voltage resistance of 500V;
the micro-strip circuit board is made of a microwave radio frequency plate with a low loss factor and a thickness of 0.8;
electrical parameter results: the passband frequency is 530M-2GHz, the passband loss can reach 0.6dB, the passband standing wave is 1.6,
47dBc at 440M and 46dBc at 2400M were suppressed.
Volume: 60 × 25 × 16 mm;
the power is 100W (design power 120W).
The present invention has been described in detail with reference to the embodiments, but the description is only exemplary of the present invention and should not be construed as limiting the scope of the present invention. The protection scope of the present invention is defined by the claims. Technical scheme, or technical personnel in the field are in the utility model technical scheme's inspiration the utility model discloses an essence and protection within range, design similar technical scheme and reach above-mentioned technological effect, perhaps to the impartial change that application scope was made and improve etc. all should still belong to within the protection scope is covered to the patent of the utility model. It should be noted that for the sake of clarity, parts of the description of the invention have been omitted which do not have a direct obvious relationship with the scope of protection of the invention, but which are known to the skilled person.
Claims (1)
1. The bridge type absorption resonance structure is characterized by comprising a box body (1), a mounting hole (2), a cover plate (3) and a circuit board (4);
a plurality of symmetrical mounting holes (2) are fixedly formed in the side face of the box body (1), a circuit board (4) is arranged at the bottom end of the interior of the box body, and a cover plate (3) is arranged at the top end of the box body; the box body (1) and the cover plate (3) form a sealing structure and both adopt metal cavities; the circuit board (4) is provided with an inductor and a capacitor; the circuit board (4) is formed by LC high-pass and microstrip low-pass mixed cascade connection, and an insulator needle matched with 50 ohms is used as the input and the output of signals; the circuit board (4) adopts a microwave radio frequency plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921905350.7U CN211352161U (en) | 2019-11-06 | 2019-11-06 | Bridge type absorption resonance structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921905350.7U CN211352161U (en) | 2019-11-06 | 2019-11-06 | Bridge type absorption resonance structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211352161U true CN211352161U (en) | 2020-08-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921905350.7U Active CN211352161U (en) | 2019-11-06 | 2019-11-06 | Bridge type absorption resonance structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211352161U (en) |
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2019
- 2019-11-06 CN CN201921905350.7U patent/CN211352161U/en active Active
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